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Troillet A, Hildebrand J, Stoffel MH, Schwabe S, Winter K, Brehm W. Histo-morphological effects on equine synovium after arthroscopic synovectomy using two different motorized synovial resectors and two different intensities. J Equine Vet Sci 2024; 133:104988. [PMID: 38157949 DOI: 10.1016/j.jevs.2023.104988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 12/21/2023] [Accepted: 12/26/2023] [Indexed: 01/03/2024]
Abstract
The purpose of the study was to determine the histo-morphological effects on villous synovium after synovectomy using two different motorized synovial resectors and two different intensities ex-vivo. Thirty-three (n = 33) equine metacarpophalangeal/metatarsophalangeal joints were used. Synovectomy was performed along the dorsomedial/dorsolateral synovium (n = 66) using two motorized synovial resectors (aggressive full radius resector, AFRR, used at two intensities: single treatment, n = 24 vs. triple treatment, n = 21 vs. aggressive meniscus side cutter, AMSC, n = 21). Arthroscopic images were evaluated blindly for resector type and intensity. Histological images were evaluated descriptive for synovial morphology and the extent of tissue loss using a microscopic scale. Scanning electron microscopy described the synovial morphology. The synovectomized areas were specific for each resector used and distinguishable from arthroscopic images. The AFRR demonstrated a clear demarcation between treated and non-treated areas and removed the stratum synoviale completely including parts of the underlying stratum fibrosum. In contrast, the AMSC showed less clear demarcation, villous scaffolds and no involvement of the stratum fibrosum. Triple intense treated AFFR samples resulted in significantly deeper lesions compared to single treatments (p = 0.037) but could not be distinguished on arthroscopic images. The morphological effects on villous synovium differ according to the resector type used. The extent of synovial tissue loss cannot be estimated from arthroscopic images but histologically. The type and use of motorized synovial resector determines the morphological alterations of the treated synovium. Arthroscopic control is considered unsuitable to control synovectomy depth.
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Affiliation(s)
- A Troillet
- Department for Horses, Faculty of Veterinary Medicine, University of Leipzig, An den Tierkliniken 21, Leipzig 04103, Germany.
| | - J Hildebrand
- Equine Clinic, VetSuisse Faculty, University of Berne, Länggassstrasse 124, Berne 3012, Switzerland
| | - M H Stoffel
- Institute for Veterinary Anatomy, VetSuisse Faculty, University of Berne, Länggassstrasse 120, Berne 3001, Switzerland
| | - S Schwabe
- Institute for Veterinary Anatomy, VetSuisse Faculty, University of Berne, Länggassstrasse 120, Berne 3001, Switzerland
| | - K Winter
- Institute of Anatomy, Medical Faculty, University of Leipzig, Liebigstrasse 12, Leipzig 04103, Germany
| | - W Brehm
- Department for Horses, Faculty of Veterinary Medicine, University of Leipzig, An den Tierkliniken 21, Leipzig 04103, Germany
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Schumacher M, Nicholson P, Stoffel MH, Chandran S, D'Mello A, Ma L, Vashee S, Jores J, Labroussaa F. Corrigendum: Evidence for the cytoplasmic localization of the L-α-Glycerophosphate oxidase in members of the " Mycoplasma mycoides cluster". Front Microbiol 2023; 14:1293129. [PMID: 37829444 PMCID: PMC10565479 DOI: 10.3389/fmicb.2023.1293129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 09/13/2023] [Indexed: 10/14/2023] Open
Abstract
[This corrects the article DOI: 10.3389/fmicb.2019.01344.].
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Affiliation(s)
- Melanie Schumacher
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | - Pamela Nicholson
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | | | | | - Adonis D'Mello
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Li Ma
- J. Craig Venter Institute, Rockville, MD, United States
| | - Sanjay Vashee
- J. Craig Venter Institute, Rockville, MD, United States
| | - Joerg Jores
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | - Fabien Labroussaa
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
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Müller A, Forterre F, Vidondo B, Stoffel MH, Hernández-Guerra Á, Plessas IN, Schmidt MJ, Precht C. Evaluation of Paraspinal Musculature in Small Breed Dogs with and without Atlantoaxial Instability Using Computed Tomography. Vet Comp Orthop Traumatol 2022; 35:305-313. [PMID: 35672019 PMCID: PMC9578766 DOI: 10.1055/s-0042-1748860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/30/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate differences in paraspinal musculature between dogs with and without atlantoaxial instability (AAI) using computed tomography scans. STUDY DESIGN Retrospective multicentre study evaluating transverse reconstructed computed tomography scans of 83 small breed dogs (34 with and 49 without AAI) for the cross-sectional paraspinal musculature area at three levels (Occiput/C1, mid-C1, mid-C2). Ratio of moments, dorsal-to-ventral muscle-area ratios (d-v-ratio) and ratios of the dorsal and ventral musculature to C2 height (d-C2-ratio and v-C2-ratio) were evaluated for differences between groups using multivariate analysis of variance (p < 0.05) taking the head-neck position into account. RESULTS Dogs with AAI showed a significantly lower d-v-ratio at levels 2 and 3, d-C2-ratio at level 2 and ratio of moments at all levels. When head-neck positions were analysed separately, ratio of moments was significantly lower in affected dogs at level 1 and 2. Also lower was d-C2-ratio at level 2, but only in flexed positioning. The head-neck position had a significant influence on ratio of moments and d-v-ratio at all three levels and on d-C2-ratio at level 1. CONCLUSION Significant changes in muscle area were observed only for the hypaxial muscles at the C1 level, indicating a limited role of muscular adaption in AAI patients. Our results confirm an altered ratio of moments in dogs with AAI. The head-neck position has a significant impact and should be taken into account when evaluating spinal musculature.
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Affiliation(s)
- Annina Müller
- Tierarztpraxis Emmevet AG, Hasle-Rüegsau, Switzerland.,Division of Small Animal Surgery, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Franck Forterre
- Division of Small Animal Surgery, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Beatriz Vidondo
- Department of Clinical Research and Veterinary Public Health, Veterinary Public Health Institute, Vetsuisse Faculty, University of Bern, Liebefeld, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Ángel Hernández-Guerra
- Department of Veterinary Medicine and Surgery, Universidad Cardenal Herrera-CEU, CEU Universities, Valencia, Spain
| | - Ioannis N Plessas
- Davies Veterinary Specialists Limited, Manor Farm Business Park, Higham Gobion, Herts, United Kingdom
| | - Martin J Schmidt
- Clinic for Small Animals, Department of Veterinary Clinical Sciences, Justus-Liebig-University Giessen, Giessen, Germany
| | - Christina Precht
- Division of Clinical Radiology, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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Taha A, Bobi J, Dammers R, Dijkhuizen RM, Dreyer AY, van Es ACGM, Ferrara F, Gounis MJ, Nitzsche B, Platt S, Stoffel MH, Volovici V, Del Zoppo GJ, Duncker DJ, Dippel DWJ, Boltze J, van Beusekom HMM. Comparison of Large Animal Models for Acute Ischemic Stroke: Which Model to Use? Stroke 2022; 53:1411-1422. [PMID: 35164533 PMCID: PMC10962757 DOI: 10.1161/strokeaha.121.036050] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Translation of acute ischemic stroke research to the clinical setting remains limited over the last few decades with only one drug, recombinant tissue-type plasminogen activator, successfully completing the path from experimental study to clinical practice. To improve the selection of experimental treatments before testing in clinical studies, the use of large gyrencephalic animal models of acute ischemic stroke has been recommended. Currently, these models include, among others, dogs, swine, sheep, and nonhuman primates that closely emulate aspects of the human setting of brain ischemia and reperfusion. Species-specific characteristics, such as the cerebrovascular architecture or pathophysiology of thrombotic/ischemic processes, significantly influence the suitability of a model to address specific research questions. In this article, we review key characteristics of the main large animal models used in translational studies of acute ischemic stroke, regarding (1) anatomy and physiology of the cerebral vasculature, including brain morphology, coagulation characteristics, and immune function; (2) ischemic stroke modeling, including vessel occlusion approaches, reproducibility of infarct size, procedural complications, and functional outcome assessment; and (3) implementation aspects, including ethics, logistics, and costs. This review specifically aims to facilitate the selection of the appropriate large animal model for studies on acute ischemic stroke, based on specific research questions and large animal model characteristics.
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Affiliation(s)
- Aladdin Taha
- Division of Experimental Cardiology, Department of Cardiology (A.T., J.B., D.J.D., H.M.M.v.B.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
- Department of Neurology, Stroke Center (A.T., D.W.J.D.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Joaquim Bobi
- Division of Experimental Cardiology, Department of Cardiology (A.T., J.B., D.J.D., H.M.M.v.B.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Ruben Dammers
- Department of Neurosurgery, Stroke Center (R.D., V.V.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Rick M Dijkhuizen
- Biomedical MR Imaging and Spectroscopy Group, Center for Image Sciences, University Medical Center Utrecht, Utrecht University, the Netherlands (R.M.D.)
| | - Antje Y Dreyer
- Max Planck Institute for Infection Biology, Campus Charité Mitte, Berlin, Germany (A.Y.D.)
| | - Adriaan C G M van Es
- Department of Radiology, Leiden University Medical Center, the Netherlands (A.C.G.M.v.E.)
| | - Fabienne Ferrara
- Fraunhofer Institute for Cell Therapy and Immunology, Leipzig, Germany (F.F.)
| | - Matthew J Gounis
- Department of Radiology, New England Center for Stroke Research, University of Massachusetts Medical School, Worcester (M.J.G.)
| | - Björn Nitzsche
- Institute of Anatomy, Faculty of Veterinary Medicine (B.N.), University of Leipzig, Germany
- Department of Nuclear Medicine (B.N.), University of Leipzig, Germany
| | - Simon Platt
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens (S.P.)
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Switzerland (M.H.S.)
| | - Victor Volovici
- Department of Neurosurgery, Stroke Center (R.D., V.V.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Gregory J Del Zoppo
- Division of Hematology (G.J.d.Z.), University of Washington School of Medicine, Seattle
- Department of Medicine (G.J.d.Z.), University of Washington School of Medicine, Seattle
- Department of Neurology (G.J.d.Z.), University of Washington School of Medicine, Seattle
| | - Dirk J Duncker
- Division of Experimental Cardiology, Department of Cardiology (A.T., J.B., D.J.D., H.M.M.v.B.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Diederik W J Dippel
- Department of Neurology, Stroke Center (A.T., D.W.J.D.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Johannes Boltze
- School of Life Sciences, Faculty of Science, University of Warwick, Coventry, United Kingdom (J.B.)
| | - Heleen M M van Beusekom
- Division of Experimental Cardiology, Department of Cardiology (A.T., J.B., D.J.D., H.M.M.v.B.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
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Adamik KN, Stoffel MH, Tangermann S, de Breuyn Dietler B, Stokar-Regenscheit N. Assessment of Hydroxyethyl Starch (6% HES 130/0.4) Kidney Storage in Critically Ill Dogs: A Post-mortem Prospective Study. Front Vet Sci 2022; 8:802507. [PMID: 35071392 PMCID: PMC8770911 DOI: 10.3389/fvets.2021.802507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 12/06/2021] [Indexed: 11/29/2022] Open
Abstract
Objective: Intravenous hydroxyethyl starch (HES) solutions are potentially nephrotoxic due to rapid renal tissue uptake, subsequent osmotic nephrosis, and long-lasting intracellular storage. This study aimed to investigate the severity of intracellular storage of HES in renal tissue samples from critically ill dogs receiving 6% HES 130/0.4. Materials and Methods: Fresh, post-mortem (<2 h after death) renal tissue samples were analyzed through histology, immunohistochemistry (HES 130/0.4-specific antibodies), and electron microscopy for the severity of renal tubular vacuolization (VAC), intravacuolar HES accumulation (ACC), and ultra-structure impairment. Moreover, we investigated the relationship between VAC or ACC grade and HES dose (mL/kg), duration of HES administration (h), and pre-HES plasma creatinine concentrations. Results: Histology revealed that 2/20 dogs (10%) had no, 11/20 dogs (55%) had mild, 5/20 dogs (25%) had moderate, and 2/20 dogs (10%) had severe VAC. Immunohistochemistry revealed that 5/20 dogs (25%) had no, 6/20 dogs (30%) had mild, 7/20 dogs (35%) had moderate, and 2/20 dogs (10%) had severe ACC. Both changes were predominantly found in the distal tubular epithelium of mild and moderate cases, and all tubular segments were affected in severe cases. Seven of 20 dogs (35%) had osmotic nephrosis (ON). On electron microscopy, large granules with an electron-dense content were repeatedly detected in individual cells, mainly in the distal tubules. No correlation was found between cumulative HES dose or duration of HES administration and VAC grade, ACC grade, or presence/absence of ON. Conclusion: A high percentage of dogs had renal tubular HES storage and one-third of dogs showed HES-induced ON. Short-term HES administration caused VAC and ACC, regardless of the dose or duration of administration. In contrast to previous studies, HES 130/0.4 deposits were mainly located in the renal distal tubule.
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Affiliation(s)
- Katja-Nicole Adamik
- Division of Small Animal Emergency and Critical Care, Department of Veterinary Clinical Medicine, University of Bern, Bern, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Department of Clinical Research and Veterinary Public Health, University of Bern, Bern, Switzerland
| | - Simone Tangermann
- Department of Infectious Diseases and Pathobiology, Institute of Animal Pathology of the Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Bettina de Breuyn Dietler
- Division of Topographic and Clinical Anatomy, Institute of Anatomy, University of Bern, Bern, Switzerland
| | - Nadine Stokar-Regenscheit
- Division of Veterinary Anatomy, Department of Clinical Research and Veterinary Public Health, University of Bern, Bern, Switzerland
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Stojiljković A, Gaschen V, Forterre F, Rytz U, Stoffel MH, Bluteau J. Novel immortalization approach defers senescence of cultured canine adipose-derived mesenchymal stromal cells. GeroScience 2021; 44:1301-1323. [PMID: 34806133 DOI: 10.1007/s11357-021-00488-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 11/08/2021] [Indexed: 01/10/2023] Open
Abstract
In the last decades, the scientific community spared no effort to elucidate the therapeutic potential of mesenchymal stromal cells (MSCs). Unfortunately, in vitro cellular senescence occurring along with a loss of proliferative capacity is a major drawback in view of future therapeutic applications of these cells in the field of regenerative medicine. Even though insight into the mechanisms of replicative senescence in human medicine has evolved dramatically, knowledge about replicative senescence of canine MSCs is still scarce. Thus, we developed a high-content analysis workflow to simultaneously investigate three important characteristics of senescence in canine adipose-derived MSCs (cAD-MSCs): morphological changes, activation of the cell cycle arrest machinery, and increased activity of the senescence-associated β-galactosidase. We took advantage of this tool to demonstrate that passaging of cAD-MSCs results in the appearance of a senescence phenotype and proliferation arrest. This was partially prevented upon immortalization of these cells using a newly designed PiggyBac™ Transposon System, which allows for the expression of the human polycomb ring finger proto-oncogene BMI1 and the human telomerase reverse transcriptase under the same promotor. Our results indicate that cAD-MSCs immortalized with this new vector maintain their proliferation capacity and differentiation potential for a longer time than untreated cAD-MSCs. This study not only offers a workflow to investigate replicative senescence in eukaryotic cells with a high-content analysis approach but also paves the way for a rapid and effective generation of immortalized MSC lines. This promotes a better understanding of these cells in view of future applications in regenerative medicine.
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Affiliation(s)
- Ana Stojiljković
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland. .,Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland.
| | - Véronique Gaschen
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Franck Forterre
- Division of Small Animal Surgery and Orthopaedics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Ulrich Rytz
- Division of Small Animal Surgery and Orthopaedics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Jasmin Bluteau
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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Ziegler A, Olzhausen J, Hamza E, Stojiljkovic A, Stoffel MH, Garbani M, Rhyner C, Marti E. An allergen-fused dendritic cell-binding peptide enhances in vitro proliferation of equine T-cells and cytokine production. Vet Immunol Immunopathol 2021; 243:110351. [PMID: 34800874 DOI: 10.1016/j.vetimm.2021.110351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 10/26/2021] [Accepted: 11/05/2021] [Indexed: 01/25/2023]
Abstract
Allergen-specific immunotherapy (AIT) constitutes the only curative approach for allergy treatment. There is need for improvement of AIT in veterinary medicine, such as in horses suffering from insect bite hypersensitivity, an IgE-mediated dermatitis to Culicoides. Dendritic cell (DC)-targeting represents an efficient method to increase antigen immunogenicity. It is studied primarily for its use in improvement of cancer therapy and vaccines, but may also be useful for improving AIT efficacy. Immunomodulators, like the Toll-like receptor 4 (TLR-4) agonist monophosphoryl lipid-A (MPLA) has been shown to enhance the IL-10 response in horses, while CpG-rich oligonucleotides (CpG-ODN), acting as TLR-9 agonists, have been shown to induce Th1 or regulatory responses in horses with equine asthma. Our aim was to evaluate in vitro effects of antigen-targeting to equine DC with an antigen-fused peptide known to target human and mouse DC and investigate whether addition of MPLA or CpG-ODN would further improve the induced immune response with regard to finding optimal conditions for equine AIT. For this purpose, DC-binding peptides were fused to the model antigen ovalbumin (OVA) and to the recombinant Culicoides allergen Cul o3. Effects of DC-binding peptides on cellular antigen uptake and induction of T cell proliferation were assessed. Polarity of the immune response was analysed by quantifying IFN-γ, IL-4, IL-10, IL-17 and IFN-α in supernatants of antigen-stimulated peripheral blood mononuclear cells (PBMC) in presence or absence of adjuvants. Fusion of DC-binding peptides to OVA significantly enhanced antigen-uptake by equine DC. DC primed with DC-binding peptides coupled to OVA or Cul o3 induced a significantly higher T-cell proliferation compared to the corresponding control antigens. PBMC stimulation with DC-binding peptides coupled to Cul o3 elicited a significant increase in the pro-inflammatory cytokines IFN-γ, IL-4, IL-17, as well as the anti-inflammatory IL-10, but not of IFN-α. Adjuvant addition further enhanced the effect of the DC-binding peptides by significantly increasing the production of IFN-γ, IL-4, IL-10 and IFN-α (CpG-ODN) and IL-10 (MPLA), while simultaneously suppressing IFN-γ, IL-4 and IL-17 production (MPLA). Targeting equine DC with allergens fused to DC-binding peptides enhances antigen-uptake and T-cell activation and may be useful in increasing the equine immune response against recombinant antigens. Combination of DC-binding peptide protein fusions with adjuvants is necessary to appropriately skew the resulting immune response, depending on intended use. Combination with MPLA is a promising option for improvement of AIT efficacy in horses, while combination with CpG-ODN increases the effector immune response to recombinant antigens.
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Affiliation(s)
- Anja Ziegler
- Division of Neurological Sciences, Vetsuisse Faculty, University of Bern, Länggassstrasse 124, CH-3001 Bern, Switzerland.
| | - Judith Olzhausen
- Swiss Institute of Allergy and Asthma Research (SIAF), University of Zürich, Herman-Burchardstrasse 9, CH-7265 Davos Wolfgang, Switzerland
| | - Eman Hamza
- Division of Neurological Sciences, Vetsuisse Faculty, University of Bern, Länggassstrasse 124, CH-3001 Bern, Switzerland; Department of Zoonoses, Faculty of Veterinary Medicine, Cairo University, Egypt
| | - Ana Stojiljkovic
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Länggassstrasse 120, CH-3001 Bern, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Länggassstrasse 120, CH-3001 Bern, Switzerland
| | - Mattia Garbani
- Swiss Institute of Allergy and Asthma Research (SIAF), University of Zürich, Herman-Burchardstrasse 9, CH-7265 Davos Wolfgang, Switzerland
| | - Claudio Rhyner
- Swiss Institute of Allergy and Asthma Research (SIAF), University of Zürich, Herman-Burchardstrasse 9, CH-7265 Davos Wolfgang, Switzerland
| | - Eliane Marti
- Division of Neurological Sciences, Vetsuisse Faculty, University of Bern, Länggassstrasse 124, CH-3001 Bern, Switzerland
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Hill V, Akarsu H, Barbarroja RS, Cippà VL, Kuhnert P, Heller M, Falquet L, Heller M, Stoffel MH, Labroussaa F, Jores J. Minimalistic mycoplasmas harbor different functional toxin-antitoxin systems. PLoS Genet 2021; 17:e1009365. [PMID: 34673769 PMCID: PMC8562856 DOI: 10.1371/journal.pgen.1009365] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 11/02/2021] [Accepted: 09/29/2021] [Indexed: 11/19/2022] Open
Abstract
Mycoplasmas are minute bacteria controlled by very small genomes ranging from 0.6 to 1.4 Mbp. They encompass several important medical and veterinary pathogens that are often associated with a wide range of chronic diseases. The long persistence of mycoplasma cells in their hosts can exacerbate the spread of antimicrobial resistance observed for many species. However, the nature of the virulence factors driving this phenomenon in mycoplasmas is still unclear. Toxin-antitoxin systems (TA systems) are genetic elements widespread in many bacteria that were historically associated with bacterial persistence. Their presence on mycoplasma genomes has never been carefully assessed, especially for pathogenic species. Here we investigated three candidate TA systems in M. mycoides subsp. capri encoding a (i) novel AAA-ATPase/subtilisin-like serine protease module, (ii) a putative AbiEii/AbiEi pair and (iii) a putative Fic/RelB pair. We sequence analyzed fourteen genomes of M. mycoides subsp. capri and confirmed the presence of at least one TA module in each of them. Interestingly, horizontal gene transfer signatures were also found in several genomic loci containing TA systems for several mycoplasma species. Transcriptomic and proteomic data confirmed differential expression profiles of these TA systems during mycoplasma growth in vitro. While the use of heterologous expression systems based on E. coli and B. subtilis showed clear limitations, the functionality and neutralization capacities of all three candidate TA systems were successfully confirmed using M. capricolum subsp. capricolum as a host. Additionally, M. capricolum subsp. capricolum was used to confirm the presence of functional TA system homologs in mycoplasmas of the Hominis and Pneumoniae phylogenetic groups. Finally, we showed that several of these M. mycoides subsp. capri toxins tested in this study, and particularly the subtilisin-like serine protease, could be used to establish a kill switch in mycoplasmas for industrial applications.
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Affiliation(s)
- Virginia Hill
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
- Graduate School for Biomedical Science, University of Bern, Bern, Switzerland
| | - Hatice Akarsu
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | | | - Valentina L. Cippà
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | - Peter Kuhnert
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | - Martin Heller
- Friedrich-Loeffler-Institute—Federal Research Institute for Animal Health, Jena, Germany
| | - Laurent Falquet
- Biochemistry Unit, University of Fribourg and Swiss Institute of Bioinformatics, Fribourg, Switzerland
| | - Manfred Heller
- Proteomics and Mass Spectrometry Core Facility, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
| | - Michael H. Stoffel
- Division of Veterinary Anatomy, Department of Clinical Research and Veterinary Public Health, University of Bern, Bern, Switzerland
| | - Fabien Labroussaa
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | - Joerg Jores
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
- * E-mail:
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Stauffer C, Van der Vekens E, Stoffel MH, Schweizer D, Bruckmaier RM. Increased teat wall thickness in response to machine milking. J Dairy Sci 2021; 104:9082-9092. [PMID: 34024610 DOI: 10.3168/jds.2021-20294] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 04/12/2021] [Indexed: 11/19/2022]
Abstract
Transiently increased teat wall thickness in response to machine milking has been documented by various methods, including ultrasound. However, correlative ultrasonography and histology to detect the origin of this phenomenon is lacking. The first goal of the present study was to evaluate and compare milking-related changes of the teat tissue in 2 breeds of dairy cows (11 Simmental and 3 Holstein) using B-mode ultrasonography. Additionally, the observed changes were compared with ultrasonographic findings in a Holstein cow with periparturient udder edema. Finally, corresponding histological sections of the Simmental teats were analyzed and compared with those from a lactating nonmilked Angus cow. We hypothesized that the mechanical load of both stretching by the vacuum during phases of open teat cup liner and compression by the closed liner during machine milking results in a transient congestion of blood vessels in the teat wall. The barrel of 1 front teat of each cow was scanned immediately before and after machine milking (system vacuum: 42 kPa; pulsation rate: 60 cycles/min; pulsation ratio: 65:35). Shortly after milking (33 ± 6 min), the Simmentals were slaughtered, and their scanned teat was immediately removed and processed for investigation by light microscopy. Ultrasonography after milking revealed anechoic tubular structures mainly in the inner half of the teat wall. Histological examination revealed these structures to be thick-walled veins. The left front and hind teats of the nonmilked lactating cow, collected and prepared identically to those from the Simmental cows, showed the same histological features. Ultrasonographic measurements showed that the diameter of these veins significantly increased after milking compared with matching images before milking. This effect was most pronounced in the Holstein cows. Similarly, these veins were very prominent in the periparturient cow. However, neither the milked cows, including the periparturient cow, nor the lactating nonmilked cow provided any evidence of edematous extravasation on ultrasonography or histology. These findings corroborated our hypothesis that the increase in size of thick-walled veins in the teat tissue is the main reason for the thickening of the teat walls in response to machine milking.
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Affiliation(s)
- Claudia Stauffer
- Veterinary Physiology, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland
| | - Elke Van der Vekens
- Clinical Radiology, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland
| | - Michael H Stoffel
- Veterinary Anatomy, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland
| | - Daniela Schweizer
- Clinical Radiology, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland
| | - Rupert M Bruckmaier
- Veterinary Physiology, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland.
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10
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Strässle M, Laloli L, Gultom M, V'kovski P, Stoffel MH, Crespo Pomar S, Chanfon Bätzner A, Ebert N, Labroussaa F, Dijkman R, Jores J, Thiel V. Establishment of caprine airway epithelial cells grown in an air-liquid interface system to study caprine respiratory viruses and bacteria. Vet Microbiol 2021; 257:109067. [PMID: 33862331 DOI: 10.1016/j.vetmic.2021.109067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 04/06/2021] [Indexed: 11/29/2022]
Abstract
Respiratory diseases negatively impact the global goat industry, but are understudied. There is a shortage of established and biological relevant in vitro or ex vivo assays to study caprine respiratory infections. Here, we describe the establishment of an in vitro system based on well-differentiated caprine airway epithelial cell (AEC) cultures grown under air liquid interface conditions as an experimental platform to study caprine respiratory pathogens. The functional differentiation of the AEC cultures was monitored and confirmed by light and immunofluorescence microscopy, scanning electron microscopy and examination of histological sections. We validated the functionality of the platform by studying Influenza D Virus (IDV) infection and Mycoplasma mycoides subsp. capri (Mmc) colonization over 5 days, including monitoring of infectious agents by titration and qPCR as well as colour changing units, respectively. The inoculation of caprine AEC cultures with IDV showed that efficient viral replication takes place, and revealed that IDV has a marked cell tropism for ciliated cells. Furthermore, AEC cultures were successfully infected with Mmc using a multiplicity of infection of 0.1 and colonization was monitored over several days. Altogether, these results demonstrate that our newly-established caprine AEC cultures can be used to investigate host-pathogen interactions of caprine respiratory pathogens.
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Affiliation(s)
- Marina Strässle
- Institute of Virology and Immunology (IVI), Bern, Switzerland; Institute of Veterinary Bacteriology, Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggass-Str. 122, PO Box 3001, Bern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Laura Laloli
- Institute of Virology and Immunology (IVI), Bern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland; Graduate School for Biomedical Science, University of Bern, Bern, Switzerland; Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Mitra Gultom
- Institute of Virology and Immunology (IVI), Bern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland; Graduate School for Biomedical Science, University of Bern, Bern, Switzerland; Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Philip V'kovski
- Institute of Virology and Immunology (IVI), Bern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Länggass-Str. 120, PO Box 3001, Bern, Switzerland
| | - Silvia Crespo Pomar
- Institute of Veterinary Bacteriology, Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggass-Str. 122, PO Box 3001, Bern, Switzerland
| | - Astrid Chanfon Bätzner
- Institute of Animal Pathology (COMPATH), Vetsuisse Faculty, University of Bern, Länggass-Str. 122, PO Box 3001, Bern, Switzerland
| | - Nadine Ebert
- Institute of Virology and Immunology (IVI), Bern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Fabien Labroussaa
- Institute of Veterinary Bacteriology, Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggass-Str. 122, PO Box 3001, Bern, Switzerland
| | - Ronald Dijkman
- Institute of Virology and Immunology (IVI), Bern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland; Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Joerg Jores
- Institute of Veterinary Bacteriology, Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggass-Str. 122, PO Box 3001, Bern, Switzerland.
| | - Volker Thiel
- Institute of Virology and Immunology (IVI), Bern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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11
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Origgi FC, Otten P, Lohmann P, Sattler U, Wahli T, Lavazza A, Gaschen V, Stoffel MH. Herpesvirus-Associated Proliferative Skin Disease in Frogs and Toads: Proposed Pathogenesis. Vet Pathol 2021; 58:713-729. [PMID: 33813961 DOI: 10.1177/03009858211006385] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A comparative study was carried out on common and agile frogs (Rana temporaria and R. dalmatina) naturally infected with ranid herpesvirus 3 (RaHV3) and common toads (Bufo bufo) naturally infected with bufonid herpesvirus 1 (BfHV1) to investigate common pathogenetic pathways and molecular mechanisms based on macroscopic, microscopic, and ultrastructural pathology as well as evaluation of gene expression. Careful examination of the tissue changes, supported by in situ hybridization, at different stages of development in 6 frogs and 14 toads revealed that the skin lesions are likely transient, and part of a tissue cycle necessary for viral replication in the infected hosts. Transcriptomic analysis, carried out on 2 naturally infected and 2 naïve common frogs (Rana temporaria) and 2 naturally infected and 2 naïve common toads (Bufo bufo), revealed altered expression of genes involved in signaling and cell remodeling in diseased animals. Finally, virus transcriptomics revealed that both RaHV3 and BfHV1 had relatively high expression of a putative immunomodulating gene predicted to encode a decoy receptor for tumor necrosis factor in the skin of the infected hosts. Thus, the comparable lesions in infected frogs and toads appear to reflect a concerted epidermal and viral cycle, with presumptive involvement of signaling and gene remodeling host and immunomodulatory viral genes.
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Affiliation(s)
| | | | | | | | | | - Antonio Lavazza
- 18207Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emila Romagna, Brescia, Italy
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12
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Bittner A, Gosselet F, Sevin E, Dehouck L, Ducray AD, Gaschen V, Stoffel MH, Cho H, Mevissen M. Time-Dependent Internalization of Polymer-Coated Silica Nanoparticles in Brain Endothelial Cells and Morphological and Functional Effects on the Blood-Brain Barrier. Int J Mol Sci 2021; 22:ijms22041657. [PMID: 33562136 PMCID: PMC7915594 DOI: 10.3390/ijms22041657] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 02/01/2021] [Accepted: 02/02/2021] [Indexed: 11/16/2022] Open
Abstract
Nanoparticle (NP)-assisted procedures including laser tissue soldering (LTS) offer advantages compared to conventional microsuturing, especially in the brain. In this study, effects of polymer-coated silica NPs used in LTS were investigated in human brain endothelial cells (ECs) and blood-brain barrier models. In the co-culture setting with ECs and pericytes, only the cell type directly exposed to NPs displayed a time-dependent internalization. No transfer of NPs between the two cell types was observed. Cell viability was decreased relatively to NP exposure duration and concentration. Protein expression of the nuclear factor ĸ-light-chain-enhancer of activated B cells and various endothelial adhesion molecules indicated no initiation of inflammation or activation of ECs after NP exposure. Differentiation of CD34+ ECs into brain-like ECs co-cultured with pericytes, blood-brain barrier (BBB) characteristics were obtained. The established endothelial layer reduced the passage of integrity tracer molecules. NP exposure did not result in alterations of junctional proteins, BBB formation or its integrity. In a 3-dimensional setup with an endothelial tube formation and tight junctions, barrier formation was not disrupted by the NPs and NPs do not seem to cross the blood-brain barrier. Our findings suggest that these polymer-coated silica NPs do not damage the BBB.
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Affiliation(s)
- Aniela Bittner
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Bern, Länggassstrasse 124, 3012 Bern, Switzerland; (A.B.); (A.D.D.)
| | - Fabien Gosselet
- Blood-Brain-Barrier Laboratory, University of Artois, UR265, Faculté Jean Perrin, Rue Jean Souvraz–SP 18, 62307 Lens, France; (F.G.); (E.S.); (L.D.)
| | - Emmanuel Sevin
- Blood-Brain-Barrier Laboratory, University of Artois, UR265, Faculté Jean Perrin, Rue Jean Souvraz–SP 18, 62307 Lens, France; (F.G.); (E.S.); (L.D.)
| | - Lucie Dehouck
- Blood-Brain-Barrier Laboratory, University of Artois, UR265, Faculté Jean Perrin, Rue Jean Souvraz–SP 18, 62307 Lens, France; (F.G.); (E.S.); (L.D.)
| | - Angélique D. Ducray
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Bern, Länggassstrasse 124, 3012 Bern, Switzerland; (A.B.); (A.D.D.)
| | - Véronique Gaschen
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Länggassstrasse 120, 3012 Bern, Switzerland; (V.G.); (M.H.S.)
| | - Michael H. Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Länggassstrasse 120, 3012 Bern, Switzerland; (V.G.); (M.H.S.)
| | - Hansang Cho
- Institute of Quantum Biophysics, Department of Biophysics, Department of Intelligent Precision Healthcare Concergence, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, #868715 N-Center Suwon-si, Gyeonggi-do 16419, Korea;
| | - Meike Mevissen
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Bern, Länggassstrasse 124, 3012 Bern, Switzerland; (A.B.); (A.D.D.)
- Correspondence: ; Tel.: +41-31-631-22-31
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13
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Schneiter M, Halm S, Odriozola A, Mogel H, Rička J, Stoffel MH, Zuber B, Frenz M, Tschanz SA. Multi-scale alignment of respiratory cilia and its relation to mucociliary function. J Struct Biol 2020; 213:107680. [PMID: 33359072 DOI: 10.1016/j.jsb.2020.107680] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 11/13/2020] [Accepted: 12/05/2020] [Indexed: 11/27/2022]
Abstract
The tracheobronchial tree is lined by a mucociliary epithelium containing millions of multiciliated cells. Their integrated oscillatory activity continuously propels an overlying pollution-protecting mucus layer in cranial direction, leading to mucociliary clearance - the primary defence mechanism of the airways. Mucociliary transport is commonly thought to co-emerge with the collective ciliary motion pattern under appropriate geometrical and rheological conditions. Proper ciliary alignment is therefore considered essential to establish mucociliary clearance in the respiratory system. Here, we used volume electron microscopy in combination with high-speed reflection contrast microscopy in order to examine ciliary orientation and its spatial organization, as well as to measure the propagation direction of metachronal waves and the direction of mucociliary transport on bovine tracheal epithelia with reference to the tracheal long axis (TLA). Ciliary orientation is measured in terms of the basal body orientation (BBO) and the axonemal orientation (AO), which are commonly considered to coincide, both equivalently indicating the effective stroke as well as the mucociliary transport direction. Our results, however, reveal that only the AO is in line with the mucociliary transport, which was found to run along a left-handed helical trajectory, whereas the BBO was found to be aligned with the TLA. Furthermore, we show that even if ciliary orientation remains consistent between adjacent cells, ciliary orientation exhibits a gradual shift within individual cells. Together with the symplectic beating geometry, this intracellular orientational pattern could provide for the propulsion of highly viscous mucus and likely constitutes a compromise between efficiency and robustness.
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Affiliation(s)
- Martin Schneiter
- Institute of Applied Physics, University of Bern, Sidlerstrasse 5, Switzerland; Institute of Anatomy, University of Bern, Baltzerstrasse 2, Switzerland
| | - Sebastian Halm
- Institute of Anatomy, University of Bern, Baltzerstrasse 2, Switzerland
| | - Adolfo Odriozola
- Institute of Anatomy, University of Bern, Baltzerstrasse 2, Switzerland
| | - Helga Mogel
- Division of Veterinary Anatomy, University of Bern, Länggassstrasse 120, Switzerland
| | - Jaroslav Rička
- Institute of Applied Physics, University of Bern, Sidlerstrasse 5, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, University of Bern, Länggassstrasse 120, Switzerland
| | - Benoît Zuber
- Institute of Anatomy, University of Bern, Baltzerstrasse 2, Switzerland.
| | - Martin Frenz
- Institute of Anatomy, University of Bern, Baltzerstrasse 2, Switzerland.
| | - Stefan A Tschanz
- Institute of Anatomy, University of Bern, Baltzerstrasse 2, Switzerland
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14
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Pisano SRR, Stoffel MH, Bodó G. Ex vivo study of vagal branches at risk for iatrogenic injury during laryngoplasty in horses. Vet Surg 2020; 50:425-434. [PMID: 33264429 DOI: 10.1111/vsu.13548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 08/22/2020] [Accepted: 11/11/2020] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To localize vagal branches within the surgical field of laryngoplasty and identify potentially hazardous surgical steps. STUDY DESIGN Observational cadaveric study. SAMPLE POPULATION Five equine head-neck specimens and four entire equine cadavers. METHODS Dissection of the pharyngeal region from a surgical perspective. Neuronal structures were considered at risk if touched or if the distance to instruments was less than 5 mm. RESULTS The branches of the pharyngeal plexus (PP) supplying the cricopharyngeal muscle (PPcr), the thyropharyngeal muscle (PPth), and the esophagus (PPes) were identified in the surgical field in nine of nine, five of nine, and one of nine specimens, respectively. The internal branch of the cranial laryngeal nerve (ibCLN) was identified within the carotid sheath in six of nine specimens. The external branch of the cranial laryngeal nerve (ebCLN) was identified close to the septum of the caudal constrictors in nine of nine specimens. The blade of the tissue retractor compressed the ibCLN in six of six, the ebCLN in four of six, the PPcr in six of six, the PPth in two of three, and the PPes in two of two specimens in which the respective nerves were identified after further dissection. Surgical exploration of the dorsolateral aspect of the pharynx and the incision of the septum of the caudal constrictors harmed the ebCLN in nine of nine, PPcr in seven of nine, and PPth in four of eight specimens. CONCLUSION Several vagal branches were located in the surgical field and must be considered at risk because of their location. CLINICAL SIGNIFICANCE Use of the tissue retractor, dissection over the pharynx, and dissection of the septum of the caudal constrictors involve a risk to damage vagal branches.
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Affiliation(s)
- Simone R R Pisano
- Department of Clinical Veterinary Science, Swiss Institute of Equine Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Michael H Stoffel
- Department of Clinical Research and Veterinary Public Health, Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Gábor Bodó
- Department of Clinical Veterinary Science, Swiss Institute of Equine Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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15
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Mbaidjol Z, Stoffel MH, Frenz M, Constantinescu MA. A novel technique for laser-assisted revascularization: an in vitro pilot study. Lasers Med Sci 2020; 36:855-862. [PMID: 32813259 DOI: 10.1007/s10103-020-03128-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2020] [Accepted: 08/10/2020] [Indexed: 10/23/2022]
Abstract
The common limitation of surgical revascularization procedures for severe tissue ischemia due to cardiovascular diseases is the need to interrupt blood flow during the intervention. We aim to introduce a new technique that allows a sutureless, non-occlusive revascularization. A 3-step technique was developed using rabbit's aorta to simulate a side-to-side anastomosis model. It enables the creation of a bypass circuit for revascularization. The first step was the soldering of 2 vessels in a side-to-side fashion based on the laser-assisted vascular anastomosis (LAVA) principle using a diode laser emitting irradiation at 810 nm with an albumin-based solder patch between them, followed by the creation of a channel within the patch using either a holmium-doped yttrium aluminum garnet laser (Ho:YAG) at λ = 2100 nm or a xenon-chloride excimer laser (XeCl) at λ = 308 nm. Thereby, a bypass circuit was created, thus allowing a non-ischemic revascularization. The system was deemed functional when a flow was observed across the anastomosis. The highest average tensile strength recorded after side-to-side LAVA using a diode laser power of 3.2 W for 60 s was 2278.6 ± 800 mN (n = 20). The Ho:YAG laser created the channels with less tension on the anastomosis than the excimer laser. Histological analysis showed limited thermal damage and good patch-tissue adaptation. The preliminary results of this feasibility study outline the foundations for an entirely sutureless laser-assisted revascularization procedure. The next studies will evaluate the rheological parameters across the bypass circuit to optimize the post-anastomotic flow.
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Affiliation(s)
- Zacharia Mbaidjol
- Department of Plastic and Reconstructive Surgery, University Hospital Bern, Freiburgstrasse, 3010, Bern, Switzerland.
| | - Michael H Stoffel
- Division of Veterinary Anatomy, University of Bern, Länggass-Strasse 120, CH-3001, Bern, Switzerland
| | - Martin Frenz
- Department of Biomedical Photonics, Institute of Applied Physics, University of Bern, Sidlerstrasse 5, 3012, Bern, Switzerland
| | - Mihai A Constantinescu
- Department of Plastic and Reconstructive Surgery, University Hospital Bern, Freiburgstrasse, 3010, Bern, Switzerland
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16
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Marcu IC, Eberhard N, Yerly A, Balmer V, Hemphill A, Mogel H, Gaschen V, Stoffel MH, Bluteau J. Isolation of Human Small Extracellular Vesicles and Tracking of their Uptake by Retinal Pigment Epithelial Cells In Vitro. Int J Mol Sci 2020; 21:E3799. [PMID: 32471212 PMCID: PMC7313035 DOI: 10.3390/ijms21113799] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 05/21/2020] [Accepted: 05/24/2020] [Indexed: 12/14/2022] Open
Abstract
Small extracellular vesicles (EVs) are among the most frequently investigated EVs and play major roles in intercellular communication by delivering various cargo molecules to target cells. They could potentially represent an alternative delivery strategy to treat ocular toxoplasmosis, a parasitosis affecting the retinal pigment epithelium (RPE). To date, the uptake of human small EVs by RPE cells has never been reported. In this study, we report on the intracellular uptake of fluorescently labelled human urine and fibroblast-derived small EVs by human RPE cells. In summary, both dye-labelled urinary small EVs and small EVs obtained from fibroblasts stably expressing membrane-bound green fluorescent protein were successfully internalized by RPE cells as revealed by immunohistochemistry. In recipient ARPE19 cells, BODIPY-labelled small EVs were found in close vicinity to the parasite Toxoplasma gondii. Additionally, an ultrastructural method was enabled to distinguish between labelled exogenous and endogenous small EVs within target cells.
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Affiliation(s)
- Irene C. Marcu
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (I.C.M.); (A.Y.); (H.M.); (V.G.); (M.H.S.)
| | - Naja Eberhard
- Institute of Parasitology, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (N.E.); (V.B.); (A.H.)
| | - Anaïs Yerly
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (I.C.M.); (A.Y.); (H.M.); (V.G.); (M.H.S.)
| | - Verena Balmer
- Institute of Parasitology, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (N.E.); (V.B.); (A.H.)
| | - Andrew Hemphill
- Institute of Parasitology, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (N.E.); (V.B.); (A.H.)
| | - Helga Mogel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (I.C.M.); (A.Y.); (H.M.); (V.G.); (M.H.S.)
| | - Véronique Gaschen
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (I.C.M.); (A.Y.); (H.M.); (V.G.); (M.H.S.)
| | - Michael H. Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (I.C.M.); (A.Y.); (H.M.); (V.G.); (M.H.S.)
| | - Jasmin Bluteau
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland; (I.C.M.); (A.Y.); (H.M.); (V.G.); (M.H.S.)
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17
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Kuhnert P, Brodard I, Alsaaod M, Steiner A, Stoffel MH, Jores J. Treponema phagedenis ( ex Noguchi 1912) Brumpt 1922 sp. nov., nom. rev., isolated from bovine digital dermatitis. Int J Syst Evol Microbiol 2020; 70:2115-2123. [PMID: 31999237 DOI: 10.1099/ijsem.0.004027] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
'Treponema phagedenis' was originally described in 1912 by Noguchi but the name was not validly published and no type strain was designated. The taxon was not included in the Approved Lists of Bacterial Names and hence has no standing in nomenclature. Six Treponema strains positive in a 'T. phagedenis' phylogroup-specific PCR test were isolated from digital dermatitis (DD) lesions of cattle and further characterized and compared with the human strain 'T. phagedenis' ATCC 27087. Results of phenotypic and genotypic analyses including API ZYM, VITEK2, MALDI-TOF and electron microscopy, as well as whole genome sequence data, respectively, showed that they form a cluster of species identity. Moreover, this species identity was shared with 'T. phagedenis'-like strains reported in the literature to be regularly isolated from bovine DD. High average nucleotide identity values between the genomes of bovine and human 'T. phagedenis' were observed. Slight genomic as well as phenotypic variations allowed us to differentiate bovine from human isolates, indicating host adaptation. Based on the fact that this species is regularly isolated from bovine DD and that the name is well dispersed in the literature, we propose the species Treponema phagedenis sp. nov., nom. rev. The species can phenotypically and genetically be identified and is clearly separated from other Treponema species. The valid species designation will allow to further explore its role in bovine DD. The type strain for Treponema phagedenis sp. nov., nom. rev. is B43.1T (=DSM 110455T=NCTC 14362T) isolated from a bovine DD lesion in Switzerland.
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Affiliation(s)
- Peter Kuhnert
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Isabelle Brodard
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Maher Alsaaod
- Clinic for Ruminants, Vetsuisse Faculty, University of Bern, Bern, Switzerland.,Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Adrian Steiner
- Clinic for Ruminants, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Joerg Jores
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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18
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Bannoehr J, Balmer P, Stoffel MH, Jagannathan V, Gaschen V, Kühni K, Sayar B, Drögemüller M, Howald D, Wiener DJ, Leeb T, Welle MM, Müller EJ, Roosje PJ. Abnormal keratinocyte differentiation in the nasal planum of Labrador Retrievers with hereditary nasal parakeratosis (HNPK). PLoS One 2020; 15:e0225901. [PMID: 32119674 PMCID: PMC7051081 DOI: 10.1371/journal.pone.0225901] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 11/14/2019] [Indexed: 01/16/2023] Open
Abstract
Hereditary nasal parakeratosis (HNPK) is an inherited disorder described in Labrador Retrievers and Greyhounds. It has been associated with breed-specific variants in the SUV39H2 gene encoding a histone 3 methyltransferase involved in epigenetic silencing. Formalin-fixed biopsies of the nasal planum of Labrador Retrievers were screened by immunofluorescence microscopy for the presence and distribution of epidermal proliferation and differentiation markers. Gene expression of these markers was further analysed using RNA sequencing (RNA-seq) and ultrastructural epidermal differences were investigated by electron microscopy. Differentiation of the nasal planum in the basal and suprabasal epidermal layers of HNPK-affected dogs (n = 6) was similar compared to control dogs (n = 6). In the upper epidermal layers, clear modifications were noticed. Loricrin protein was absent in HNPK-affected nasal planum sections in contrast to sections of the same location of control dogs. However, loricrin was present in the epidermis of paw pads and abdominal skin from HNPK dogs and healthy control dogs. The patterns of keratins K1, K10 and K14, were not markedly altered in the nasal planum of HNPK-affected dogs while the expression of the terminal differentiation marker involucrin appeared less regular. Based on RNA-seq, LOR and IVL expression levels were significantly decreased, while KRT1, KRT10 and KRT14 levels were up-regulated (log2fold-changes of 2.67, 3.19 and 1.71, respectively) in HNPK-affected nasal planum (n = 3) compared to control dogs (n = 3). Electron microscopical analysis revealed structural alterations in keratinocytes and stratum corneum, and disrupted keratinocyte adhesions and distended intercellular spaces in lesional samples (n = 3) compared to a sample of a healthy control dog (n = 1). Our findings demonstrate aberrant keratinocyte terminal differentiation of the nasal planum of HNPK-affected Labrador Retrievers and provide insights into biological consequences of this inactive SUV39H2 gene variant.
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Affiliation(s)
- Jeanette Bannoehr
- Division of Clinical Dermatology, Department of Clinical Veterinary Science, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Pierre Balmer
- Division of Clinical Dermatology, Department of Clinical Veterinary Science, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Michael H. Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Vidhya Jagannathan
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Véronique Gaschen
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Kathrin Kühni
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Beyza Sayar
- DermFocus, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- Department of Clinical Research, Molecular Dermatology and Stem Cell Research, University of Bern, Bern, Switzerland
| | | | - Denise Howald
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Dominique J. Wiener
- DermFocus, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Tosso Leeb
- DermFocus, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Monika M. Welle
- DermFocus, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Eliane J. Müller
- DermFocus, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- Department of Clinical Research, Molecular Dermatology and Stem Cell Research, University of Bern, Bern, Switzerland
- Clinic for Dermatology, Inselspital, Bern University Hospital, Bern, Switzerland
| | - Petra J. Roosje
- Division of Clinical Dermatology, Department of Clinical Veterinary Science, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- DermFocus, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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19
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Planchamp B, Bluteau J, Stoffel MH, Precht C, Schmidli F, Forterre F. Morphometric and functional study of the canine atlantoaxial joint. Res Vet Sci 2019; 128:76-85. [PMID: 31759272 DOI: 10.1016/j.rvsc.2019.11.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 10/12/2019] [Accepted: 11/12/2019] [Indexed: 10/25/2022]
Abstract
The atlantoaxial joint can be affected by instability, in most cases a congenital pathology in young small breed dogs. Causes of atlantoaxial instability (AAI) are variable but are usually attributed to a lack of ligamentous support. The purpose of the present study was to specify the role of the ligamentous structures in the stabilisation of the atlantoaxial joint and to find possible adaptations of the ligaments' internal structure to their specific function. Five Beagle cadavers were included in this study. Each dog was subjected to a computed tomography (CT) and a magnetic resonance imaging (MRI) examination of the upper cervical region. This region was then dissected and the ligamentous structures stabilising the atlantoaxial joint were measured and removed for histological analysis. A ligament to dens ratio (LDR) was established in order to provide a basis for comparison with the measurements taken in other dog breeds. MRI and gross anatomical measurements were very similar, confirming the validity of the results. MRI thus seems reliable for evaluating the ligamentous structures of the canine occipitoatlantoaxial region. The movement exerting the greatest stress on the atlantoaxial ligaments and inducing the greatest distension of the alar ligaments was a head flexion combined with a rotation. A clear adaptation of the ligamentous shape and internal structure to their specific function was observed. Histologically, alar ligaments consisted of wavy collagen fibres and a high proportion of elastic fibres, providing them with a remarkable elasticity compared to the transverse ligament structure which was much more rigid.
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Affiliation(s)
- Bastien Planchamp
- Division of Small Animal Surgery, Department of Clinical Veterinary Medicine, University of Berne, Switzerland
| | - Jasmin Bluteau
- Division of Veterinary Anatomy, University of Berne, Switzerland
| | | | - Christina Precht
- Division of Clinical Radiology, Department of Clinical Veterinary Medicine, University of Berne, Switzerland
| | - Fenella Schmidli
- Division of Veterinary Neurology, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Berne, Switzerland
| | - Franck Forterre
- Division of Small Animal Surgery, Department of Clinical Veterinary Medicine, University of Berne, Switzerland.
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20
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Racine J, O'Brien T, Bladon BM, Cruz AM, Stoffel MH, Haenssgen K, Rodgerson DH, Livesey MA, Koch C. Ceratohyoidectomy in standing sedated horses. Vet Surg 2019; 48:1391-1398. [PMID: 31469435 DOI: 10.1111/vsu.13319] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 06/14/2019] [Accepted: 08/08/2019] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To investigate the feasibility and complications associated with ceratohyoidectomy (CHE) in standing sedated horses unaffected (experimental horses) and standing sedated horses affected (clinical cases) with temporohyoid osteoarthropathy (THO). STUDY DESIGN Case series. ANIMALS Six experimental horses and four clinical cases. METHODS Standing CHE was performed in six experimental horses euthanized 30 minutes (n = 3) and 7 days (n = 3) postoperatively. The four clinical cases were presented because of central facial nerve paralysis (n = 3), vestibular ataxia (n = 3), auricular hemorrhage (n = 2), quidding (n = 1), and oesophageal impaction (n = 1). Evolution was assessed by clinical examination during hospitalization and later by telephone interviews for the clinical cases. RESULTS The procedure was successfully performed in all horses. Experimental horses did not show any short-term postoperative complications. Hemorrhage was experienced intraoperatively in one of the clinical cases and was successfully managed with placement of hemostatic forceps. Vestibular ataxia and other symptoms of THO improved within days, but facial nerve paralysis did not improve until 9 days to 6 months after surgery. Follow-up ranged from 9 to 24 months. All clinical cases returned to performance, and client satisfaction was excellent. CONCLUSION Ceratohyoidectomy was consistently feasible in standing sedated horses. The method did not result in postoperative complications and led to resolution of clinical signs associated with THO. CLINICAL SIGNIFICANCE Standing CHE should be considered in horses affected with THO, especially when horses present with marked vestibular deficits and ataxia, to reduce risks associated with recovery from general anesthesia.
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Affiliation(s)
- Julien Racine
- Department of Equine Surgery, Swiss Institute for Equine Medicine, University of Bern, Bern, Switzerland
| | - Thomas O'Brien
- Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, Wisconsin
| | - Bruce M Bladon
- Donnington Grove Veterinary Surgery, Oxford Road, Newbury, United Kingdom
| | - Antonio M Cruz
- Department of Equine Surgery, Swiss Institute for Equine Medicine, University of Bern, Bern, Switzerland
| | - Michael H Stoffel
- Department of Veterinary Anatomy, Swiss Institute for Equine Medicine, University of Bern, Bern, Switzerland
| | - Kati Haenssgen
- Department of Veterinary Anatomy, Swiss Institute for Equine Medicine, University of Bern, Bern, Switzerland
| | - Dwayne H Rodgerson
- Davidson Surgical Center, Hagyard Equine Medical Institute, Lexington, Kentucky
| | - Michael A Livesey
- Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, Wisconsin
| | - Christoph Koch
- Department of Equine Surgery, Swiss Institute for Equine Medicine, University of Bern, Bern, Switzerland
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21
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Vidondo B, Stettler S, Stojiljkovic A, Mogel H, Gaschen V, Spadavecchia C, Casoni D, Stoffel MH. Assessment of potential neuropathic changes in cattle after cautery disbudding. Res Vet Sci 2019; 126:9-16. [PMID: 31419617 DOI: 10.1016/j.rvsc.2019.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 07/07/2019] [Accepted: 08/02/2019] [Indexed: 02/02/2023]
Abstract
Disbudding of calves is a standard husbandry procedure to reduce the risk of injuries to other cattle and to workers. Whereas acute pain resulting from disbudding has been studied extensively, little is known about chronic pain as a potential long-term consequence. The goal of the present study was to investigate possible morphological changes in the cornual nerve as a function of disbudding. Samples were collected from 17 randomly selected bulls and from 21 calves from a prospective clinical study. Among the calves, 13 were disbudded and 8 were sham-disbudded. Out of the disbudded calves, 4 showed signs of chronic pain. In all the animals, the infraorbital nerve was used as a methodological check. Morphological analysis included measuring minimal diameters of the axons present in both the cornual and infraorbital nerves. Sympathetic fibers were identified as based on the presence of Tyroxine hydroxylase (TH). TH-negative fibers were considered afferents. Trigeminal ganglia from the calves were immunostained for glial fibrillary acidic protein (GFAP) and Activating transcription factor 3 (ATF3). R. cornualis and N. infraorbitalis differed in terms of axon diameters and proportion of TH-positive fibers. Weak evidence (p > .091) of a difference in axon diameters between control and disbudded calves was found in R. cornualis, but the proportion of TH-positive fibers was alike in both groups. Average glial envelope and the percentages of ATF3-positive neurons revealed no difference between calves with and without signs of pain. Thus, available evidence is insufficient to support neuropathic changes as a result of disbudding in calves.
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Affiliation(s)
- B Vidondo
- Veterinary Public Health Institute, Vetsuisse Faculty, University of Bern, POB 3350, CH - 3001 Bern, Switzerland
| | - S Stettler
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, POB 3350, CH - 3001 Bern, Switzerland
| | - A Stojiljkovic
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, POB 3350, CH - 3001 Bern, Switzerland.
| | - H Mogel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, POB 3350, CH - 3001 Bern, Switzerland.
| | - V Gaschen
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, POB 3350, CH - 3001 Bern, Switzerland.
| | - C Spadavecchia
- Division of Veterinary Anesthesia, Vetsuisse Faculty, University of Bern, POB 3350, CH - 3001 Bern, Switzerland.
| | - D Casoni
- Division of Veterinary Anesthesia, Vetsuisse Faculty, University of Bern, POB 3350, CH - 3001 Bern, Switzerland.
| | - M H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, POB 3350, CH - 3001 Bern, Switzerland.
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22
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Schumacher M, Nicholson P, Stoffel MH, Chandran S, D’Mello A, Ma L, Vashee S, Jores J, Labroussaa F. Evidence for the Cytoplasmic Localization of the L-α-Glycerophosphate Oxidase in Members of the " Mycoplasma mycoides Cluster". Front Microbiol 2019; 10:1344. [PMID: 31275271 PMCID: PMC6593217 DOI: 10.3389/fmicb.2019.01344] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 05/29/2019] [Indexed: 12/15/2022] Open
Abstract
Members of the "Mycoplasma mycoides cluster" are important animal pathogens causing diseases including contagious bovine pleuropneumonia and contagious caprine pleuropneumonia, which are of utmost importance in Africa or Asia. Even if all existing vaccines have shortcomings, vaccination of herds is still considered the best way to fight mycoplasma diseases, especially with the recent and dramatic increase of antimicrobial resistance observed in many mycoplasma species. A new generation of vaccines will benefit from a better understanding of the pathogenesis of mycoplasmas, which is very patchy up to now. In particular, surface-exposed virulence traits are likely to induce a protective immune response when formulated in a vaccine. The candidate virulence factor L-α-glycerophosphate oxidase (GlpO), shared by many mycoplasmas including Mycoplasma pneumoniae, was suggested to be a surface-exposed enzyme in Mycoplasma mycoides subsp. mycoides responsible for the production of hydrogen peroxide directly into the host cells. We produced a glpO isogenic mutant GM12::YCpMmyc1.1-ΔglpO using in-yeast synthetic genomics tools including the tandem-repeat endonuclease cleavage (TREC) technique followed by the back-transplantation of the engineered genome into a mycoplasma recipient cell. GlpO localization in the mutant and its parental strain was assessed using scanning electron microscopy (SEM). We obtained conflicting results and this led us to re-evaluate the localization of GlpO using a combination of in silico and in vitro techniques, such as Triton X-114 fractionation or tryptic shaving followed by immunoblotting. Our in vitro results unambiguously support the finding that GlpO is a cytoplasmic protein throughout the "Mycoplasma mycoides cluster." Thus, the use of GlpO as a candidate vaccine antigen is unlikely to induce a protective immune response.
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Affiliation(s)
- Melanie Schumacher
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | - Pamela Nicholson
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | | | | | - Adonis D’Mello
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Li Ma
- J. Craig Venter Institute, Rockville, MD, United States
| | - Sanjay Vashee
- J. Craig Venter Institute, Rockville, MD, United States
| | - Joerg Jores
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | - Fabien Labroussaa
- Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
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23
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Bittner A, Ducray AD, Widmer HR, Stoffel MH, Mevissen M. Effects of gold and PCL- or PLLA-coated silica nanoparticles on brain endothelial cells and the blood-brain barrier. Beilstein J Nanotechnol 2019; 10:941-954. [PMID: 31165021 PMCID: PMC6541356 DOI: 10.3762/bjnano.10.95] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 04/04/2019] [Indexed: 06/09/2023]
Abstract
Nanomedicine is a constantly expanding field, facilitating and improving diagnosis and treatment of diseases. As nanomaterials are foreign objects, careful evaluation of their toxicological and functional aspects prior to medical application is imperative. In this study, we aimed to determine the effects of gold and polymer-coated silica nanoparticles used in laser tissue soldering on brain endothelial cells and the blood-brain barrier using rat brain capillary endothelial cells (rBCEC4). All types of nanoparticles were taken up time-dependently by the rBCEC4 cells, albeit to a different extent, causing a time- and concentration-dependent decrease in cell viability. Nanoparticle exposure did not change cell proliferation, differentiation, nor did it induce inflammation. rBCEC4 cells showed blood-brain barrier characteristics including tight junctions. None of the nanoparticles altered the expression of tight junctions or impaired the blood-brain barrier permeability. The findings suggest that effects of these nanoparticles on the metabolic state of cells have to be further characterized before use for medical purposes.
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Affiliation(s)
- Aniela Bittner
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Bern, Länggassstrasse 124, 3012 Bern, Switzerland
| | - Angélique D Ducray
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Bern, Länggassstrasse 124, 3012 Bern, Switzerland
| | - Hans Rudolf Widmer
- Department of Neurosurgery, Research Unit, Inselspital, University of Bern, Freiburgstrasse 8, 3010 Bern, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Länggassstrasse 120, 3012 Bern, Switzerland
| | - Meike Mevissen
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Bern, Länggassstrasse 124, 3012 Bern, Switzerland
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24
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Jores J, Ma L, Ssajjakambwe P, Schieck E, Liljander A, Chandran S, Stoffel MH, Cippa V, Arfi Y, Assad-Garcia N, Falquet L, Sirand-Pugnet P, Blanchard A, Lartigue C, Posthaus H, Labroussaa F, Vashee S. Removal of a Subset of Non-essential Genes Fully Attenuates a Highly Virulent Mycoplasma Strain. Front Microbiol 2019; 10:664. [PMID: 31001234 PMCID: PMC6456743 DOI: 10.3389/fmicb.2019.00664] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 03/18/2019] [Indexed: 12/14/2022] Open
Abstract
Mycoplasmas are the smallest free-living organisms and cause a number of economically important diseases affecting humans, animals, insects, and plants. Here, we demonstrate that highly virulent Mycoplasma mycoides subspecies capri (Mmc) can be fully attenuated via targeted deletion of non-essential genes encoding, among others, potential virulence traits. Five genomic regions, representing approximately 10% of the original Mmc genome, were successively deleted using Saccharomyces cerevisiae as an engineering platform. Specifically, a total of 68 genes out of the 432 genes verified to be individually non-essential in the JCVI-Syn3.0 minimal cell, were excised from the genome. In vitro characterization showed that this mutant was similar to its parental strain in terms of its doubling time, even though 10% of the genome content were removed. A novel in vivo challenge model in goats revealed that the wild-type parental strain caused marked necrotizing inflammation at the site of inoculation, septicemia and all animals reached endpoint criteria within 6 days after experimental infection. This is in contrast to the mutant strain, which caused no clinical signs nor pathomorphological lesions. These results highlight, for the first time, the rational design, construction and complete attenuation of a Mycoplasma strain via synthetic genomics tools. Trait addition using the yeast-based genome engineering platform and subsequent in vitro or in vivo trials employing the Mycoplasma chassis will allow us to dissect the role of individual candidate Mycoplasma virulence factors and lead the way for the development of an attenuated designer vaccine.
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Affiliation(s)
- Joerg Jores
- Department of Infectious Diseases and Pathobiology, Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland.,International Livestock Research Institute, Nairobi, Kenya
| | - Li Ma
- J. Craig Venter Institute, Rockville, MD, United States
| | - Paul Ssajjakambwe
- International Livestock Research Institute, Nairobi, Kenya.,College of Veterinary Medicine, Animal Resources and Biosecurity, Makerere University, Kampala, Uganda
| | - Elise Schieck
- International Livestock Research Institute, Nairobi, Kenya
| | - Anne Liljander
- International Livestock Research Institute, Nairobi, Kenya
| | | | - Michael H Stoffel
- Division of Veterinary Anatomy, Department of Clinical Research and Veterinary Public Health, University of Bern, Bern, Switzerland
| | - Valentina Cippa
- Department of Infectious Diseases and Pathobiology, Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | - Yonathan Arfi
- UMR 1332 - Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Villenave-d'Ornon, France.,UMR 1332 - Biologie du Fruit et Pathologie, Université de Bordeaux, Villenave-d'Ornon, France
| | | | - Laurent Falquet
- Biochemistry Unit, Swiss Institute of Bioinformatics, University of Fribourg, Fribourg, Switzerland
| | - Pascal Sirand-Pugnet
- UMR 1332 - Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Villenave-d'Ornon, France.,UMR 1332 - Biologie du Fruit et Pathologie, Université de Bordeaux, Villenave-d'Ornon, France
| | - Alain Blanchard
- UMR 1332 - Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Villenave-d'Ornon, France.,UMR 1332 - Biologie du Fruit et Pathologie, Université de Bordeaux, Villenave-d'Ornon, France
| | - Carole Lartigue
- UMR 1332 - Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Villenave-d'Ornon, France.,UMR 1332 - Biologie du Fruit et Pathologie, Université de Bordeaux, Villenave-d'Ornon, France
| | - Horst Posthaus
- Department for Infectious Diseases and Pathobiology, Institute of Animal Pathology (COMPATH), University of Bern, Bern, Switzerland
| | - Fabien Labroussaa
- Department of Infectious Diseases and Pathobiology, Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland
| | - Sanjay Vashee
- J. Craig Venter Institute, Rockville, MD, United States
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25
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Wiedmer L, Ducray AD, Frenz M, Stoffel MH, Widmer HR, Mevissen M. Silica nanoparticle-exposure during neuronal differentiation modulates dopaminergic and cholinergic phenotypes in SH-SY5Y cells. J Nanobiotechnology 2019; 17:46. [PMID: 30935413 PMCID: PMC6442417 DOI: 10.1186/s12951-019-0482-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 03/23/2019] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Silica-ε-polycaprolactone-nanoparticles (SiPCL-NPs) represent a promising tool for laser-tissue soldering in the brain. After release of the SiPCL-NPs in the brain, neuronal differentiation might be modulated. The present study was performed to determine effects of SiPCL-NP-exposure at different stages of neuronal differentiation in neuron-like SH-SY5Y cells. The resulting phenotypes were analyzed quantitatively and signaling pathways involved in neuronal differentiation and degeneration were studied. SH-SY5Y cells were differentiated with all-trans retinoic acid or staurosporine to obtain predominantly cholinergic or dopaminergic neurons. The resulting phenotype was analyzed at the end of differentiation with and without the SiPCL-NPs given at various times during differentiation. RESULTS Exposure to SiPCL-NPs before and during differentiation led to a decreased cell viability of SH-SY5Y cells depending on the differentiation protocol used. SiPCL-NPs co-localized with the neuronal marker β-3-tubulin but did not alter the morphology of these cells. A significant decrease in the number of tyrosine hydroxylase (TH) immunoreactive neurons was found in staurosporine-differentiated cells when SiPCL-NPs were added at the end of the differentiation. TH-protein expression was also significantly downregulated when SiPCL-NPs were applied in the middle of differentiation. Protein expression of the marker for the dopamine active transporter (DAT) was not affected by SiPCL-NPs. SiPCL-NP-exposure predominantly decreased the expression of the high-affinity choline transporter 1 (CHT1) when the NPs were given before the differentiation. Pathways involved in neuronal differentiation, namely Akt, MAP-K, MAP-2 and the neurodegeneration-related markers β-catenin and GSK-3β were not altered by NP-exposure. CONCLUSIONS The decrease in the number of dopaminergic and cholinergic cells may implicate neuronal dysfunction, but the data do not provide evidence that pathways relevant for differentiation and related to neurodegeneration are impaired.
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Affiliation(s)
- Linda Wiedmer
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Bern, Laenggassstrasse 124, 3012 Bern, Switzerland
| | - Angélique D. Ducray
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Bern, Laenggassstrasse 124, 3012 Bern, Switzerland
| | - Martin Frenz
- Institute of Applied Physics, University of Bern, Bern, Switzerland
| | - Michael H. Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Hans-Rudolf Widmer
- Department of Neurosurgery, Research Unit, Inselspital, University of Bern, Bern, Switzerland
| | - Meike Mevissen
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Bern, Laenggassstrasse 124, 3012 Bern, Switzerland
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26
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Liljander A, Sacchini F, Stoffel MH, Schieck E, Stokar-Regenscheit N, Labroussaa F, Heller M, Salt J, Frey J, Falquet L, Goovaerts D, Jores J. Reproduction of contagious caprine pleuropneumonia reveals the ability of convalescent sera to reduce hydrogen peroxide production in vitro. Vet Res 2019; 50:10. [PMID: 30736863 PMCID: PMC6368817 DOI: 10.1186/s13567-019-0628-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 01/23/2019] [Indexed: 01/20/2023] Open
Abstract
Contagious caprine pleuropneumonia (CCPP), caused by Mycoplasma capricolum subsp. capripneumoniae is a severe disease widespread in Africa and Asia. Limited knowledge is available on the pathogenesis of this organism, mainly due to the lack of a robust in vivo challenge model and the means to do site-directed mutagenesis. This work describes the establishment of a novel caprine challenge model for CCPP that resulted in 100% morbidity using a combination of repeated intranasal spray infection followed by a single transtracheal infection employing the recent Kenyan outbreak strain ILRI181. Diseased animals displayed CCPP-related pathology and the bacteria could subsequently be isolated from pleural exudates and lung tissues in concentrations of up to 109 bacteria per mL as well as in the trachea using immunohistochemistry. Reannotation of the genome sequence of ILRI181 and F38T revealed the existence of genes encoding the complete glycerol uptake and metabolic pathways involved in hydrogen peroxide (H2O2) production in the phylogenetically related pathogen M. mycoides subsp. mycoides. Furthermore, the expression of L-α-glycerophosphate oxidase (GlpO) in vivo was confirmed. In addition, the function of the glycerol metabolism was verified by measurement of production of H2O2 in medium containing physiological serum concentrations of glycerol. Peroxide production could be inhibited with serum from convalescent animals. These results will pave the way for a better understanding of host-pathogen interactions during CCPP and subsequent vaccine development.
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Affiliation(s)
- Anne Liljander
- International Livestock Research Institute, Box 30709, Nairobi, 00100, Kenya
| | - Flavio Sacchini
- International Livestock Research Institute, Box 30709, Nairobi, 00100, Kenya.,Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Länggass-Str. 122, Postfach, 3001, Bern, Switzerland.,Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise "G. Caporale", via Campo Boario, 64100, Teramo, Italy
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Länggass-Str. 120, Postfach, 3001, Bern, Switzerland
| | - Elise Schieck
- International Livestock Research Institute, Box 30709, Nairobi, 00100, Kenya
| | - Nadine Stokar-Regenscheit
- Institute of Animal Pathology (COMPATH), Vetsuisse Faculty, University of Bern, Länggass-Str. 122, Postfach, 3001, Bern, Switzerland
| | - Fabien Labroussaa
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Länggass-Str. 122, Postfach, 3001, Bern, Switzerland
| | - Martin Heller
- Friedrich-Loeffler-Institute-Federal Research Institute for Animal Health, Naumburger Str. 96a, 07743, Jena, Germany
| | - Jeremy Salt
- GALVmed, Doherty Building, Pentlands Science Park, Bush Loan, Penicuik, Edinburgh, EH26 0PZ, Scotland, UK
| | - Joachim Frey
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Länggass-Str. 122, Postfach, 3001, Bern, Switzerland
| | - Laurent Falquet
- Division of Biochemistry, Department of Biology, University of Fribourg and Swiss Institute of Bioinformatics, Chemin du Musée 18, 1700, Fribourg, Switzerland
| | - Danny Goovaerts
- GALVmed, Doherty Building, Pentlands Science Park, Bush Loan, Penicuik, Edinburgh, EH26 0PZ, Scotland, UK
| | - Joerg Jores
- International Livestock Research Institute, Box 30709, Nairobi, 00100, Kenya. .,Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Länggass-Str. 122, Postfach, 3001, Bern, Switzerland.
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V'kovski P, Gerber M, Kelly J, Pfaender S, Ebert N, Braga Lagache S, Simillion C, Portmann J, Stalder H, Gaschen V, Bruggmann R, Stoffel MH, Heller M, Dijkman R, Thiel V. Determination of host proteins composing the microenvironment of coronavirus replicase complexes by proximity-labeling. eLife 2019; 8:42037. [PMID: 30632963 PMCID: PMC6372286 DOI: 10.7554/elife.42037] [Citation(s) in RCA: 114] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 01/11/2019] [Indexed: 12/31/2022] Open
Abstract
Positive-sense RNA viruses hijack intracellular membranes that provide niches for viral RNA synthesis and a platform for interactions with host proteins. However, little is known about host factors at the interface between replicase complexes and the host cytoplasm. We engineered a biotin ligase into a coronaviral replication/transcription complex (RTC) and identified >500 host proteins constituting the RTC microenvironment. siRNA-silencing of each RTC-proximal host factor demonstrated importance of vesicular trafficking pathways, ubiquitin-dependent and autophagy-related processes, and translation initiation factors. Notably, detection of translation initiation factors at the RTC was instrumental to visualize and demonstrate active translation proximal to replication complexes of several coronaviruses. Collectively, we establish a spatial link between viral RNA synthesis and diverse host factors of unprecedented breadth. Our data may serve as a paradigm for other positive-strand RNA viruses and provide a starting point for a comprehensive analysis of critical virus-host interactions that represent targets for therapeutic intervention. Coronaviruses can infect the nose and throat and are a main cause of the common cold. Infections are usually mild and short-lived, but sometimes they can turn nasty. In 2002 and 2012, two dangerous new coronaviruses emerged and caused diseases known as SARS and MERS. These viruses caused much more serious symptoms and in some cases proved deadly. The question is, why are some coronaviruses more dangerous than others? Scientists know that the body's response to virus infection can make a difference to whether someone had mild or severe disease. So, to understand why some coronaviruses cause a cold and others kill, they also need to learn how people react to virus infection. Coronaviruses hijack membranes inside cells and turn them into virus factories. Within these factories, the viruses build molecular machinery called replicase complexes to copy their genetic code, which is needed for the next generation of virus particles. The viruses steal and repurpose proteins from their host cell that will assist in the copying process. However, scientists do not yet know which host proteins are essential for the virus to multiply. So, to find out, V’kovski et al. developed a way to tag any host protein that came near the virus factories. The new technique involved attaching an enzyme called a biotin ligase to the replicase complex. This enzyme acts as a molecular label gun, attaching a chemical tag to any protein that comes within ten nanometres. The label gun revealed that more than 500 different proteins come into contact with the replicase complex. To find out what these proteins were doing, the next step was to switch off their genes one by one. This revealed the key cell machinery that coronaviruses hijack when they are replicating. It included the cell's cargo transport system, the waste disposal system, and the protein production system. Using these systems allows the viruses to copy their genetic code next to machines that can turn it straight into viral proteins. These new results provide clues about which proteins viruses actually need from their host cells. They also do not just apply to coronaviruses. Other viruses use similar strategies to complete their infection cycle. These findings could help researchers to understand more generally about how viruses multiply. In the future, this knowledge could lead to new ways to combat virus infections.
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Affiliation(s)
- Philip V'kovski
- Institute of Virology and Immunology IVI, Bern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland.,Graduate School for Biomedical Science, University of Bern, Bern, Switzerland
| | - Markus Gerber
- Institute of Virology and Immunology IVI, Bern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Jenna Kelly
- Institute of Virology and Immunology IVI, Bern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland.,Interfaculty Bioinformatics Unit, SIB Swiss Institute of Bioinformatics, University of Bern, Bern, Switzerland
| | - Stephanie Pfaender
- Institute of Virology and Immunology IVI, Bern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Nadine Ebert
- Institute of Virology and Immunology IVI, Bern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Sophie Braga Lagache
- Mass Spectrometry and Proteomics Core Facility, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
| | - Cedric Simillion
- Mass Spectrometry and Proteomics Core Facility, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland.,Department of Clinical Research, University of Bern, Bern, Switzerland
| | - Jasmine Portmann
- Institute of Virology and Immunology IVI, Bern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Hanspeter Stalder
- Institute of Virology and Immunology IVI, Bern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Véronique Gaschen
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Rémy Bruggmann
- Interfaculty Bioinformatics Unit, SIB Swiss Institute of Bioinformatics, University of Bern, Bern, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Manfred Heller
- Mass Spectrometry and Proteomics Core Facility, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
| | - Ronald Dijkman
- Institute of Virology and Immunology IVI, Bern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Volker Thiel
- Institute of Virology and Immunology IVI, Bern, Switzerland.,Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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28
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Maurer T, Stoffel MH, Belyaev Y, Stiefel NG, Vidondo B, Küker S, Mogel H, Schäfer B, Balmer J. Structural characterization of four different naturally occurring porcine collagen membranes suitable for medical applications. PLoS One 2018; 13:e0205027. [PMID: 30281664 PMCID: PMC6169977 DOI: 10.1371/journal.pone.0205027] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 09/18/2018] [Indexed: 01/28/2023] Open
Abstract
Collagen is the main structural element of connective tissues, and its favorable properties make it an ideal biomaterial for regenerative medicine. In dental medicine, collagen barrier membranes fabricated from naturally occurring tissues are used for guided bone regeneration. Since the morphological characteristics of collagen membranes play a crucial role in their mechanical properties and affect the cellular behavior at the defect site, in-depth knowledge of the structure is key. As a base for the development of novel collagen membranes, an extensive morphological analysis of four porcine membranes, including centrum tendineum, pericardium, plica venae cavae and small intestinal submucosa, was performed. Native membranes were analyzed in terms of their thickness. Second harmonic generation and two-photon excitation microscopy of the native membranes showed the 3D architecture of the collagen and elastic fibers, as well as a volumetric index of these two membrane components. The surface morphology, fiber arrangement, collagen fibril diameter and D-periodicity of decellularized membranes were investigated by scanning electron microscopy. All the membrane types showed significant differences in thickness. In general, undulating collagen fibers were arranged in stacked layers, which were parallel to the membrane surface. Multiphoton microscopy revealed a conspicuous superficial elastic fiber network, while the elastin content in deeper layers varied. The elastin/collagen volumetric index was very similar in the investigated membranes and indicated that the collagen content was clearly higher than the elastin content. The surface of both the pericardium and plica venae cavae and the cranial surface of the centrum tendineum revealed a smooth, tightly arranged and crumpled morphology. On the caudal face of the centrum tendineum, a compact collagen arrangement was interrupted by clusters of circular discontinuities. In contrast, both surfaces of the small intestinal submucosa were fibrous, fuzzy and irregular. All the membranes consisted of largely uniform fibrils displaying the characteristic D-banding. This study reveals similarities and relevant differences among the investigated porcine membranes, suggesting that each membrane represents a unique biomaterial suitable for specific applications.
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Affiliation(s)
- Thimo Maurer
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Michael H. Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Yury Belyaev
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | | | - Beatriz Vidondo
- Veterinary Public Health Institute, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Susanne Küker
- Veterinary Public Health Institute, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Helga Mogel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | | | - Jasmin Balmer
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- * E-mail:
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29
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Josi C, Bürki S, Stojiljkovic A, Wellnitz O, Stoffel MH, Pilo P. Bovine Epithelial in vitro Infection Models for Mycoplasma bovis. Front Cell Infect Microbiol 2018; 8:329. [PMID: 30280094 PMCID: PMC6153342 DOI: 10.3389/fcimb.2018.00329] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Accepted: 08/28/2018] [Indexed: 12/20/2022] Open
Abstract
Mycoplasma bovis causes bovine mycoplasmosis. The major clinical manifestations are pneumonia and mastitis. Recently an increase in the severity of mastitis cases was reported in Switzerland. At the molecular level, there is limited understanding of the mechanisms of pathogenicity of M. bovis. Host–pathogen interactions were primarily studied using primary bovine blood cells. Therefore, little is known about the impact of M. bovis on other cell types present in infected tissues. Clear in vitro phenotypes linked to the virulence of M. bovis strains or tissue predilection of specific M. bovis strains have not yet been described. We adapted bovine in vitro systems to investigate infection of epithelial cells with M. bovis using a cell line (MDBK: Madin-Darby bovine kidney cells) and two primary cells (PECT: bovine embryonic turbinate cells and bMec: bovine mammary gland epithelial cells). Two strains isolated before and after the emergence of severe mastitis cases were selected. Strain JF4278 isolated from a cow with mastitis and pneumonia in 2008 and strain L22/93 isolated in 1993 were used to assess the virulence of M. bovis genotypes toward epithelial cells with particular emphasis on mammary gland cells. Our findings indicate that M. bovis is able to adhere to and invade different epithelial cell types. Higher titers of JF4278 than L22/93 were observed in co-cultures with cells. The differences in titers reached between the two strains was more prominent for bMec cells than for MDBK and PECT cells. Moreover, M. bovis strain L22/93 induced apoptosis in MDBK cells and cytotoxicity in PECT cells but not in bMec cells. Dose-dependent variations in proliferation of primary epithelial cells were observed after M. bovis infection. Nevertheless, an indisputable phenotype that could be related to the increased virulence toward mammary gland cells is not obvious.
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Affiliation(s)
- Christoph Josi
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, Institute of Veterinary Bacteriology University of Bern, Bern, Switzerland.,Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
| | - Sibylle Bürki
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, Institute of Veterinary Bacteriology University of Bern, Bern, Switzerland
| | - Ana Stojiljkovic
- Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland.,Division of Veterinary Anatomy, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Olga Wellnitz
- Veterinary Physiology, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Paola Pilo
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, Institute of Veterinary Bacteriology University of Bern, Bern, Switzerland
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30
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Moalli F, Ficht X, Germann P, Vladymyrov M, Stolp B, de Vries I, Lyck R, Balmer J, Fiocchi A, Kreutzfeldt M, Merkler D, Iannacone M, Ariga A, Stoffel MH, Sharpe J, Bähler M, Sixt M, Diz-Muñoz A, Stein JV. The Rho regulator Myosin IXb enables nonlymphoid tissue seeding of protective CD8 + T cells. J Exp Med 2018; 215:1869-1890. [PMID: 29875261 PMCID: PMC6028505 DOI: 10.1084/jem.20170896] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 12/28/2017] [Accepted: 05/11/2018] [Indexed: 12/27/2022] Open
Abstract
Moalli et al. combine in vitro CD8+ T cell motility analysis with intravital imaging of mouse tissues to identify the actomyosin regulator Myo9b as a central player for nonlymphoid tissue infiltration during adaptive immune responses by facilitating crossing of tissue barriers. T cells are actively scanning pMHC-presenting cells in lymphoid organs and nonlymphoid tissues (NLTs) with divergent topologies and confinement. How the T cell actomyosin cytoskeleton facilitates this task in distinct environments is incompletely understood. Here, we show that lack of Myosin IXb (Myo9b), a negative regulator of the small GTPase Rho, led to increased Rho-GTP levels and cell surface stiffness in primary T cells. Nonetheless, intravital imaging revealed robust motility of Myo9b−/− CD8+ T cells in lymphoid tissue and similar expansion and differentiation during immune responses. In contrast, accumulation of Myo9b−/− CD8+ T cells in NLTs was strongly impaired. Specifically, Myo9b was required for T cell crossing of basement membranes, such as those which are present between dermis and epidermis. As consequence, Myo9b−/− CD8+ T cells showed impaired control of skin infections. In sum, we show that Myo9b is critical for the CD8+ T cell adaptation from lymphoid to NLT surveillance and the establishment of protective tissue–resident T cell populations.
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Affiliation(s)
- Federica Moalli
- Theodor Kocher Institute, University of Bern, Bern, Switzerland
| | - Xenia Ficht
- Theodor Kocher Institute, University of Bern, Bern, Switzerland
| | - Philipp Germann
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra (UPF), Barcelona, Spain.,European Molecular Biology Laboratory, Barcelona, Spain
| | - Mykhailo Vladymyrov
- Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics (LHEP), University of Bern, Bern, Switzerland
| | - Bettina Stolp
- Theodor Kocher Institute, University of Bern, Bern, Switzerland
| | - Ingrid de Vries
- Institute for Science and Technology Austria, Klosterneuburg, Austria
| | - Ruth Lyck
- Theodor Kocher Institute, University of Bern, Bern, Switzerland
| | - Jasmin Balmer
- Department of Clinical Research and Veterinary Public Health, University of Bern, Bern, Switzerland
| | - Amleto Fiocchi
- Division of Immunology, Transplantation and Infectious Diseases, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Mario Kreutzfeldt
- Department of Pathology and Immunology, Division of Clinical Pathology, University and University Hospitals of Geneva, Geneva, Switzerland
| | - Doron Merkler
- Department of Pathology and Immunology, Division of Clinical Pathology, University and University Hospitals of Geneva, Geneva, Switzerland
| | - Matteo Iannacone
- Division of Immunology, Transplantation and Infectious Diseases and Experimental Imaging Center, IRCCS San Raffaele Scientific Institute and Vita-Salute San Raffaele University, Milan, Italy
| | - Akitaka Ariga
- Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics (LHEP), University of Bern, Bern, Switzerland
| | - Michael H Stoffel
- Department of Clinical Research and Veterinary Public Health, University of Bern, Bern, Switzerland
| | - James Sharpe
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra (UPF), Barcelona, Spain.,European Molecular Biology Laboratory, Barcelona, Spain.,Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
| | - Martin Bähler
- Institut für Molekulare Zellbiologie, Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Michael Sixt
- Institute for Science and Technology Austria, Klosterneuburg, Austria
| | - Alba Diz-Muñoz
- Cell Biology and Biophysics Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Jens V Stein
- Theodor Kocher Institute, University of Bern, Bern, Switzerland
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31
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Nitzsche B, Boltze J, Ludewig E, Flegel T, Schmidt MJ, Seeger J, Barthel H, Brooks OW, Gounis MJ, Stoffel MH, Schulze S. A stereotaxic breed-averaged, symmetric T2w canine brain atlas including detailed morphological and volumetrical data sets. Neuroimage 2018; 187:93-103. [PMID: 29407456 DOI: 10.1016/j.neuroimage.2018.01.066] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 01/17/2018] [Accepted: 01/25/2018] [Indexed: 12/23/2022] Open
Abstract
Stereotaxic systems and automatic tissue segmentation routines enable neuronavigation as well as reproducible processing of neuroimage datasets. Such systems have been developed for humans, non-human-primates, sheep, and rodents, but not for dogs. Although dogs share important neurofunctional and -anatomical features with humans, and in spite of their importance in translational neuroscience, little is known about the variability of the canine brain morphology and, possibly related, function. Moreover, we lack templates, tissue probability maps (TPM), and stereotaxic brain labels for implementation in standard software utilities such as Statistical Parametric Mapping (SPM). Hence, objective and reproducible, image-based investigations are currently impeded in dogs. We have created a detailed stereotaxic reference frame for dogs including TPM and tissue labels, enabling inter-individual and cross-study neuroimage analysis. T2w datasets were acquired from 16 neurologically inconspicuous dogs of different breeds by 3T MRI. The datasets were averaged after initial preprocessing using linear and nonlinear registration algorithms as implemented in SPM8. TPM for gray (GM) and white matter (WM) as well as cerebrospinal fluid (CSF) were created. Different cortical, subcortical, medullary, and CSF regions were manually labeled to create a spatial binary atlas being aligned with the template. A proof-of-concept for automatic determination of morphological and volumetrical characteristics was performed using additional canine datasets (n = 64) including a subgroup of laboratory beagles (n = 24). Overall, 21 brain regions were labeled using the segmented tissue classes of the brain template. The proof-of-concept trial revealed excellent suitability of the created tools for image processing and subsequent analysis. There was high intra-breed variability in frontal lobe and hippocampus volumes, and noticeable inter-breed corpus callosum volume variation. The T2w brain template provides important, breed-averaged canine brain anatomy features in a spatial standard coordinate system. TPM allows automatic tissue segmentation using SPM and enables unbiased automatic image processing or morphological characterization in different canine breeds. The reported volumetric and morphometric results may serve as a starting point for further research aimed at in vivo analysis of canine brain anatomy and function.
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Affiliation(s)
- Björn Nitzsche
- Department for Nuclear Medicine, University Hospital of Leipzig, Leipzig, Germany; Institute of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany.
| | - Johannes Boltze
- Department of Translational Medicine and Cell Technology, Fraunhofer Research Institution for Marine Biotechnology and Cell Technology, Institute of Medical and Marine Biotechnology, University of Lübeck, Lübeck, Germany
| | - Eberhard Ludewig
- Clinic Unit of Diagnostic Imaging, University of Veterinary Medicine Vienna, Austria
| | - Thomas Flegel
- Department of Small Animals Medicine, Veterinary Faculty, University of Leipzig, Leipzig, Germany
| | - Martin J Schmidt
- Department of Veterinary Clinical Sciences, Clinic for Small Animals - Neurosurgery, Neuroradiology and Clinical Neurology, Faculty of Veterinary Medicine, Justus-Liebig-University Gießen, Gießen, Germany
| | - Johannes Seeger
- Institute of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Henryk Barthel
- Department for Nuclear Medicine, University Hospital of Leipzig, Leipzig, Germany
| | - Olivia W Brooks
- Department of Radiology, New England Center for Stroke Research, University of Massachusetts Medical School, Worcester, MA, USA
| | - Matthew J Gounis
- Department of Radiology, New England Center for Stroke Research, University of Massachusetts Medical School, Worcester, MA, USA
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Sabine Schulze
- Department of Veterinary Clinical Sciences, Clinic for Small Animals - Neurosurgery, Neuroradiology and Clinical Neurology, Faculty of Veterinary Medicine, Justus-Liebig-University Gießen, Gießen, Germany
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32
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Meichtry C, Glauser U, Glardon M, Ross SG, Lechner I, Kneubuehl BP, Gascho D, Spadavecchia C, von Rotz A, Stojiljkovic A, Stoffel MH. Assessment of a specifically developed bullet casing gun for the stunning of water buffaloes. Meat Sci 2018; 135:74-78. [DOI: 10.1016/j.meatsci.2017.09.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 07/30/2017] [Accepted: 09/13/2017] [Indexed: 10/18/2022]
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33
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Glardon M, Schwenk BK, Riva F, von Holzen A, Ross SG, Kneubuehl BP, Stoffel MH. Energy loss and impact of various stunning devices used for the slaughtering of water buffaloes. Meat Sci 2017; 135:159-165. [PMID: 29035813 DOI: 10.1016/j.meatsci.2017.09.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 09/25/2017] [Accepted: 09/26/2017] [Indexed: 11/28/2022]
Abstract
Stock management of the Swiss water buffalo livestock results in the slaughtering of about 350 animals per year. As the stunning of water buffaloes still is an unresolved issue, we investigated the terminal ballistics of currently used perforating stunning devices. Cartridge fired captive bolt devices, handguns and a bullet casing gun were tested in a shooting steep by firing on bisected heads, forehead plates and soap blocks. Energy loss of captive bolts confirmed their inadequacy when used for heavy water buffaloes, notably adult males. As for the free projectiles, ballistics revealed that beyond the impact energy, bullet deformation has a strong impact on the outcome. Light 9mm Luger or .38 Spl bullets as well as large deformable .44 Rem. Magnum bullets should be avoided in favor of heavier .357 Magnum deformation ammunition. These data have been translated into the development of a new stunning device for water buffaloes meeting both animal welfare and occupational safety requirements.
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Affiliation(s)
- Matthieu Glardon
- Institute of Forensic Medicine, Forensic Physics and Ballistics, University of Berne, Berne, Switzerland.
| | - Barbara K Schwenk
- Division of Veterinary Anatomy, University of Berne, Berne, Switzerland.
| | - Fabiano Riva
- Institute of Forensic Medicine, Forensic Physics and Ballistics, University of Berne, Berne, Switzerland.
| | - Adrian von Holzen
- Institute of Forensic Medicine, Forensic Physics and Ballistics, University of Berne, Berne, Switzerland.
| | - Steffen G Ross
- Institute of Forensic Medicine, Forensic Medicine and Imaging, University of Zurich, Switzerland.
| | - Beat P Kneubuehl
- Institute of Forensic Medicine, Forensic Physics and Ballistics, University of Berne, Berne, Switzerland.
| | - Michael H Stoffel
- Division of Veterinary Anatomy, University of Berne, Berne, Switzerland.
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34
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Gebhardt-Henrich SG, Pfulg A, Fröhlich EKF, Käppeli S, Guggisberg D, Liesegang A, Stoffel MH. Limited Associations between Keel Bone Damage and Bone Properties Measured with Computer Tomography, Three-Point Bending Test, and Analysis of Minerals in Swiss Laying Hens. Front Vet Sci 2017; 4:128. [PMID: 28848740 PMCID: PMC5554496 DOI: 10.3389/fvets.2017.00128] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 07/26/2017] [Indexed: 11/25/2022] Open
Abstract
Keel bone damage is a wide-spread welfare problem in laying hens. It is unclear so far whether bone quality relates to keel bone damage. The goal of the present study was to detect possible associations between keel bone damage and bone properties of intact and damaged keel bones and of tibias in end-of-lay hens raised in loose housing systems. Bones were palpated and examined by peripheral quantitative computer tomography (PQCT), a three-point bending test, and analyses of bone ash. Contrary to our expectations, PQCT revealed higher cortical and trabecular contents in fractured than in intact keel bones. This might be due to structural bone repair after fractures. Density measurements of cortical and trabecular tissues of keel bones did not differ between individuals with and without fractures. In the three-point bending test of the tibias, ultimate shear strength was significantly higher in birds with intact vs. fractured keel bones. Likewise, birds with intact or slightly deviated keel bones had higher mineral and calcium contents of the keel bone than birds with fractured keel bones. Calcium content in keel bones was correlated with calcium content in tibias. Although there were some associations between bone traits related to bone strength and keel bone damage, other factors such as stochastic events related to housing such as falls and collisions seem to be at least as important for the prevalence of keel bone damage.
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Affiliation(s)
- Sabine G Gebhardt-Henrich
- Federal Veterinary Office, Centre for Proper Housing of Poultry and Rabbits, Zollikofen, Switzerland
| | - Andreas Pfulg
- Federal Veterinary Office, Centre for Proper Housing of Poultry and Rabbits, Zollikofen, Switzerland
| | - Ernst K F Fröhlich
- Federal Veterinary Office, Centre for Proper Housing of Poultry and Rabbits, Zollikofen, Switzerland
| | - Susanna Käppeli
- Federal Veterinary Office, Centre for Proper Housing of Poultry and Rabbits, Zollikofen, Switzerland
| | - Dominik Guggisberg
- Agroscope, Institut für Lebensmittelwissenschaften (ILM), Bern, Switzerland
| | - Annette Liesegang
- Vetsuisse Faculty, Institute of Animal Nutrition, University of Zürich, Zürich, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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Schönfeld A, Kabra ZM, Constantinescu M, Bosshardt D, Stoffel MH, Peters K, Frenz M. Binding of indocyanine green in polycaprolactone fibers using blend electrospinning for in vivo laser-assisted vascular anastomosis. Lasers Surg Med 2017; 49:928-939. [PMID: 28699660 DOI: 10.1002/lsm.22701] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/22/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND OBJECTIVE The clinical application of laser-assisted vascular anastomosis is afflicted by unreliable and low bonding strengths as well as tedious handling during microvascular surgery. The challenge to be met arises from the flow-off of the chromophore during soldering that changes the absorption and stains the surrounding tissue, leading to an uncontrollable thermal damage zone. In this study, we investigated the feasibility to produce an indocyanine green (ICG)-loaded patch by electrospinning and tested its applicability to both in vitro and in vivo microvascular laser soldering. MATERIALS AND METHODS A blend of polycaprolactone and ICG was electrospun to produce a pliable patch. Prior to soldering, the patch was soaked in 40% wt. bovine serum albumin solution. The solder patch was wrapped in vitro around blood vessel stumps of rabbit aortas. An intraluminal balloon catheter enabled an easy alignment and held the setup in place. The soldering energy was delivered via a diffusor fiber from the vessel lumen using a diode laser at 810 nm. During the procedure, the surface temperature was observed with an infrared camera. Afterward, samples were embedded in methylmethacrylate and epon to study thermal damage. The quality of the fusion was assessed by measuring the tensile strength. After in vitro tests with rabbit aortas, eight large white pigs were subjected to an acute in vivo experiment, and the artery of the latissimus dorsi flap was anastomosed to the distal femoral artery. RESULTS The ICG-loaded patch, produced by electrospinning, has a thickness of 279 ± 62 μm, a fiber diameter of 1.20 ± 0.19 μm, and an attenuation coefficient of 1,119 ± 183 cm-1 at a wavelength of 790 nm. The patch was pliable and easy to handle during surgery. No leakage of the chromophore was observed. Thermal damage was restricted to the Tunica adventitia and Tunica media and the area of the vessel wall that was covered with the patch. Six pigs were successfully treated, without any bleeding and with a continuous blood flow. The in vivo flap model yielded a similar tensile strength compared to in vitro laser-assisted vascular anastomoses (138 ± 52 vs. 117 ± 30 mN/mm2 ). CONCLUSION Our study demonstrated the applicability of the ICG-loaded patch for laser-assisted vascular anastomosis. By using electrospinning, ICG could be bound to polymer fibers, avoiding its flow-off and the staining of the surrounding tissue. This patch demonstrated several advantages over liquid solder as it was easier to apply, ensured a high and reliable bonding strength while maintaining a constant concentration of ICG concentration during the surgery. Lasers Surg. Med. 49:928-939, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Annemarie Schönfeld
- Department of Biomedical Photonics, University of Bern, Institute of Applied Physics, Sidlerstrasse 5, Bern 3012, Switzerland.,Department of Cell Biology, University Medicine Rostock, Schillingallee 69, Rostock 18057, Germany
| | - Zacharia Mbäıdjol Kabra
- Department of Plastic and Reconstructive Surgery, University Hospital Bern, Bern 3010, Switzerland
| | - Mihai Constantinescu
- Department of Plastic and Reconstructive Surgery, University Hospital Bern, Bern 3010, Switzerland
| | - Dieter Bosshardt
- Robert K. Schenk Laboratory of Oral Histology, School of Dental Medicine, University of Bern, Bern 3010, Switzerland
| | - Michael H Stoffel
- Vetsuisse Faculty, Division of Veterinary Anatomy, University of Bern, Länggass-Strasse 120, Bern 3012, Switzerland
| | - Kirsten Peters
- Department of Cell Biology, University Medicine Rostock, Schillingallee 69, Rostock 18057, Germany
| | - Martin Frenz
- Department of Biomedical Photonics, University of Bern, Institute of Applied Physics, Sidlerstrasse 5, Bern 3012, Switzerland
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Origgi FC, Schmidt BR, Lohmann P, Otten P, Akdesir E, Gaschen V, Aguilar-Bultet L, Wahli T, Sattler U, Stoffel MH. Ranid Herpesvirus 3 and Proliferative Dermatitis in Free-Ranging Wild Common Frogs (Rana Temporaria). Vet Pathol 2017; 54:686-694. [PMID: 28494706 DOI: 10.1177/0300985817705176] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Amphibian pathogens are of current interest as contributors to the global decline of amphibians. However, compared with chytrid fungi and ranaviruses, herpesviruses have received relatively little attention. Two ranid herpesviruses have been described: namely, Ranid herpesvirus 1 (RHV1) and Ranid herpesvirus 2 (RHV2). This article describes the discovery and partial characterization of a novel virus tentatively named Ranid herpesvirus 3 (RHV3), a candidate member of the genus Batrachovirus in the family Alloherpesviridae. RHV3 infection in wild common frogs (Rana temporaria) was associated with severe multifocal epidermal hyperplasia, dermal edema, a minor inflammatory response, and variable mucous gland degeneration. Intranuclear inclusions were numerous in the affected epidermis together with unique extracellular aggregates of herpesvirus-like particles. The RHV3-associated skin disease has features similar to those of a condition recognized in European frogs for the last 20 years and whose cause has remained elusive. The genome of RHV3 shares most of the features of the Alloherpesviruses. The characterization of this presumptive pathogen may be of value for amphibian conservation and for a better understanding of the biology of Alloherpesviruses.
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Affiliation(s)
- F C Origgi
- 1 Department of Infectious Diseases and Pathobiology (DIP), Centre for Fish and Wildlife Health (FIWI), University of Bern, Bern, Switzerland.,2 Institute of Veterinary Bacteriology, DIP, Bern, Switzerland
| | - B R Schmidt
- 3 KARCH, Neuchâtel, Switzerland, and Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland
| | | | - P Otten
- 5 Fasteris SA, Geneva, Switzerland
| | - E Akdesir
- 1 Department of Infectious Diseases and Pathobiology (DIP), Centre for Fish and Wildlife Health (FIWI), University of Bern, Bern, Switzerland
| | - V Gaschen
- 6 Division of Veterinary Anatomy, University of Bern, Bern, Switzerland
| | | | - T Wahli
- 1 Department of Infectious Diseases and Pathobiology (DIP), Centre for Fish and Wildlife Health (FIWI), University of Bern, Bern, Switzerland
| | - U Sattler
- 1 Department of Infectious Diseases and Pathobiology (DIP), Centre for Fish and Wildlife Health (FIWI), University of Bern, Bern, Switzerland
| | - M H Stoffel
- 6 Division of Veterinary Anatomy, University of Bern, Bern, Switzerland
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Stojiljković A, Kuehni-Boghenbor K, Gaschen V, Schüpbach G, Mevissen M, Kinnear C, Möller AM, Stoffel MH. High-content analysis of factors affecting gold nanoparticle uptake by neuronal and microglial cells in culture. Nanoscale 2016; 8:16650-16661. [PMID: 27722378 DOI: 10.1039/c6nr05723c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Owing to their ubiquitous distribution, expected beneficial effects and suspected adverse effects, nanoparticles are viewed as a double-edged sword, necessitating a better understanding of their interactions with tissues and organisms. Thus, the goals of the present study were to develop and present a method to generate quantitative data on nanoparticle entry into cells in culture and to exemplarily demonstrate the usefulness of this approach by analyzing the impact of size, charge and various proteinaceous coatings on particle internalization. N9 microglial cells and both undifferentiated and differentiated SH-SY5Y neuroblastoma cells were exposed to customized gold nanoparticles. After silver enhancement, the particles were visualized by epipolarization microscopy and analysed by high-content analysis. The value of this approach was substantiated by assessing the impact of various parameters on nanoparticle uptake. Uptake was higher in microglial cells than in neuronal cells. Only microglial cells showed a distinct size preference, preferring particles with a diameter of 80 nm. Positive surface charge had the greatest impact on particle uptake. Coating with bovine serum albumin, fetuin or protein G significantly increased particle internalization in microglial cells but not in neuronal cells. Coating with wheat germ agglutinin increased particle uptake in both N9 and differentiated SH-SY5Y cells but not in undifferentiated SH-SY5Y cells. Furthermore, internalization was shown to be an active process and indicators of caspase-dependent apoptosis revealed that gold nanoparticles did not have any cytotoxic effects. The present study thus demonstrates the suitability of gold nanoparticles and high-content analysis for assessing numerous variables in a stringently quantitative and statistically significant manner. Furthermore, the results presented herein showcase the feasibility of specifically targeting nanoparticles to distinct cell types.
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Affiliation(s)
- A Stojiljković
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - K Kuehni-Boghenbor
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - V Gaschen
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - G Schüpbach
- Veterinary Public Health Institute, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - M Mevissen
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - C Kinnear
- Adolphe Merkle Institute, University of Fribourg, Switzerland
| | - A-M Möller
- Division of Veterinary Pharmacology and Toxicology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - M H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
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Mock T, Mehinagic K, Menzi F, Studer E, Oevermann A, Stoffel MH, Drögemüller C, Meylan M, Regenscheit N. Clinicopathological Phenotype of Autosomal Recessive Cholesterol Deficiency in Holstein Cattle. J Vet Intern Med 2016; 30:1369-75. [PMID: 27279263 PMCID: PMC5089636 DOI: 10.1111/jvim.13976] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 03/14/2016] [Accepted: 04/28/2016] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Cholesterol deficiency (CD), a newly identified autosomal recessive genetic defect in Holstein cattle, is associated with clinical signs of diarrhea, failure to thrive, and hypocholesterolemia. HYPOTHESIS/OBJECTIVES The objective is to describe the clinicopathological phenotype of affected Holstein cattle homozygous for the causative apolipoprotein B gene (APOB) mutation. ANIMALS Six Holstein cattle, 5 calves with a clinical history of chronic diarrhea, and 1 heifer with erosions in the buccal cavity and neurologic symptoms were admitted to the Clinic for Ruminants. METHODS This case review included a full clinical examination, a complete blood count, blood chemistry, and measurements of cholesterol and triglycerides. The animals were euthanized and necropsied. A PCR-based direct gene test was applied to determine the APOB genotype. RESULTS All 6 animals were inbred, could be traced back to the sire Maughlin Storm, and were confirmed homozygous for the APOB mutation. The clinical phenotype included poor development, underweight, and intermittent diarrhea in the calves, and neurologic signs in the heifer included hypermetria and pacing. Hypocholesterolemia and low triglycerides concentrations were present in all animals. The pathological phenotype of all animals was steatorrhea with enterocytes of the small intestine containing intracytoplasmic lipid vacuoles. The peripheral nervous system of the heifer displayed degenerative changes. CONCLUSIONS AND CLINICAL IMPORTANCE Suspicion of CD in Holstein cattle is based on the presence of chronic diarrhea with no evidence of primary infections. Confirmation of the associated APOB gene mutation is needed. Additionally, the heifer demonstrated primarily signs of neurologic disease providing an unexpected phenotype of CD.
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Affiliation(s)
- T Mock
- Clinic for Ruminants, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - K Mehinagic
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - F Menzi
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - E Studer
- Clinic for Ruminants, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - A Oevermann
- Division of Neurological Sciences, DCR-VPH, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - M H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - C Drögemüller
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - M Meylan
- Clinic for Ruminants, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - N Regenscheit
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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Schwenk BK, Lechner I, Ross SG, Gascho D, Kneubuehl BP, Glardon M, Stoffel MH. Magnetic resonance imaging and computer tomography of brain lesions in water buffaloes and cattle stunned with handguns or captive bolts. Meat Sci 2015; 113:35-40. [PMID: 26610289 DOI: 10.1016/j.meatsci.2015.11.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 11/03/2015] [Accepted: 11/10/2015] [Indexed: 10/22/2022]
Abstract
Owing to the demand for genuine mozzarella, some 330 water buffaloes are being slaughtered every year in Switzerland albeit a stunning procedure meeting animal welfare and occupational safety requirements remains to be established. To provide a basis for improvements, we sized anatomical specifics in water buffaloes and cattle and we assessed brain lesions after stunning with captive bolts or handguns by diagnostic imaging. In water buffaloes and cattle, the median distance from the frontal skin surface to the inner bone table was 74.0mm (56.0-100.0mm) vs 36.6mm (29.3-44.3mm) and from skin to the thalamus 144.8mm (117.1-172.0mm) vs 102.0 (101.0-121.0mm), respectively. Consequently, customary captive bolt stunners may be inadequate. Free bullets are potentially suitable for stunning buffaloes but involve occupational safety hazards. The results of the present study shall be used to develop a device allowing effective and safe stunning of water buffaloes.
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Affiliation(s)
- Barbara K Schwenk
- Division of Veterinary Anatomy, University of Berne, Berne, Switzerland
| | - Isabel Lechner
- Veterinary Public Health Institute, University of Berne, Berne, Switzerland.
| | - Steffen G Ross
- Department of Forensic Medicine and Radiology, Institute of Forensic Medicine, University of Zurich, Switzerland.
| | - Dominic Gascho
- Department of Forensic Medicine and Radiology, Institute of Forensic Medicine, University of Zurich, Switzerland.
| | - Beat P Kneubuehl
- Institute of Forensic Physics/Ballistics, University of Berne, Berne, Switzerland.
| | - Matthieu Glardon
- Institute of Forensic Physics/Ballistics, University of Berne, Berne, Switzerland.
| | - Michael H Stoffel
- Division of Veterinary Anatomy, University of Berne, Berne, Switzerland.
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40
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Müller AK, Brinkmann M, Baumann L, Stoffel MH, Segner H, Kidd KA, Hollert H. Morphological alterations in the liver of yellow perch (Perca flavescens) from a biological mercury hotspot. Environ Sci Pollut Res Int 2015; 22:17330-17342. [PMID: 25936831 DOI: 10.1007/s11356-015-4177-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 01/27/2015] [Indexed: 06/04/2023]
Abstract
Mercury (Hg) contamination is a global issue due to its anthropogenic release, long-range transport, and deposition in remote areas. In Kejimkujik National Park and National Historic Site, Nova Scotia, Canada, high concentrations of total mercury (THg) were found in tissues of yellow perch (Perca flavescens). The aim of this study was to evaluate a possible relationship between THg concentrations and the morphology of perch liver as a main site of metal storage and toxicity. Yellow perch were sampled from five lakes known to contain fish representing a wide range in Hg concentrations in fall 2013. The ultrastructure of hepatocytes and the distribution of Hg within the liver parenchyma were analyzed by transmission electron microscopy (TEM) and electron energy loss spectrometry (EELS). The relative area of macrophage aggregates (MAs) in the liver was determined using image analysis software and fluorescence microscopy. No relation between general health indicators (Fulton's condition index) and THg was observed. In line with this, TEM examination of the liver ultrastructure revealed no prominent pathologies related to THg accumulation. However, a morphological parameter that appeared to increase with muscle THg was the relative area of MAs in the liver. The hepatic lysosomes appeared to be enlarged in samples with the highest THg concentrations. Interestingly, EELS analysis revealed that the MAs and hepatic lysosomes contained Hg.
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Affiliation(s)
- Anne-Katrin Müller
- Department of Ecosystem Analysis, Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany
| | - Markus Brinkmann
- Department of Ecosystem Analysis, Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany
| | - Lisa Baumann
- Centre for Fish and Wildlife Health, Vetsuisse Faculty, University of Bern, Länggassstr. 122, 3012, Bern, Switzerland
| | - Michael H Stoffel
- Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Länggassstr. 120, 3012, Bern, Switzerland
| | - Helmut Segner
- Centre for Fish and Wildlife Health, Vetsuisse Faculty, University of Bern, Länggassstr. 122, 3012, Bern, Switzerland
| | - Karen A Kidd
- Canadian Rivers Institute and Biology Department, University of New Brunswick, 100 Tucker Park Road, Saint John, New Brunswick, E2L 4L5, Canada
| | - Henner Hollert
- Department of Ecosystem Analysis, Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany.
- College of Resources and Environmental Science, Chongqing University, 1 Tiansheng Road Beibei, Chongqing, 400715, China.
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, 1239 Siping Road, Shanghai, China.
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China.
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Blatti-Cardinaux L, Pisoni G, Stoffel MH, Zanoni R, Zahno ML, Bertoni G. Generation of a molecular clone of an attenuated lentivirus, a first step in understanding cytopathogenicity and virulence. Virology 2015; 487:50-8. [PMID: 26517396 DOI: 10.1016/j.virol.2015.09.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 09/23/2015] [Accepted: 09/30/2015] [Indexed: 11/20/2022]
Abstract
Small ruminant lentiviruses infect goats and sheep, inducing clinical disease in a minority of infected animals. Following an eradication campaign, clinical cases may disappear in a population. The complete elimination of these lentiviruses is however difficult to achieve and the spreading of less virulent strains often parallels the elimination of their virulent counterparts. Here, we characterized three such strains isolated from a flock in the post-eradication phase. We completely sequenced their genomes, showing that one of the isolates was most probably the product of a recombination event between the other two viruses. By comparing the sequences of these isolates with those of virulent strains, we found evidence that particular LTR mutations may explain their attenuated phenotype. Finally, we constructed an infectious molecular clone representative of these viruses, analyzing its replication characteristics in different target cells. This clone will permit us to explore the molecular correlates of cytopathogenicity and virulence.
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Affiliation(s)
- Laure Blatti-Cardinaux
- Institute of Virology and Immunology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Giuliano Pisoni
- Università degli Studi di Milano, Department of Health, Animal Science and Food Safety, via Celoria 10, 20133 Milano, Italy
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Reto Zanoni
- Institute of Virology and Immunology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Marie-Luise Zahno
- Institute of Virology and Immunology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Giuseppe Bertoni
- Institute of Virology and Immunology, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
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Nitzsche B, Frey S, Collins LD, Seeger J, Lobsien D, Dreyer A, Kirsten H, Stoffel MH, Fonov VS, Boltze J. A stereotaxic, population-averaged T1w ovine brain atlas including cerebral morphology and tissue volumes. Front Neuroanat 2015; 9:69. [PMID: 26089780 PMCID: PMC4455244 DOI: 10.3389/fnana.2015.00069] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2015] [Accepted: 05/12/2015] [Indexed: 01/18/2023] Open
Abstract
Standard stereotaxic reference systems play a key role in human brain studies. Stereotaxic coordinate systems have also been developed for experimental animals including non-human primates, dogs, and rodents. However, they are lacking for other species being relevant in experimental neuroscience including sheep. Here, we present a spatial, unbiased ovine brain template with tissue probability maps (TPM) that offer a detailed stereotaxic reference frame for anatomical features and localization of brain areas, thereby enabling inter-individual and cross-study comparability. Three-dimensional data sets from healthy adult Merino sheep (Ovis orientalis aries, 12 ewes and 26 neutered rams) were acquired on a 1.5 T Philips MRI using a T1w sequence. Data were averaged by linear and non-linear registration algorithms. Moreover, animals were subjected to detailed brain volume analysis including examinations with respect to body weight (BW), age, and sex. The created T1w brain template provides an appropriate population-averaged ovine brain anatomy in a spatial standard coordinate system. Additionally, TPM for gray (GM) and white (WM) matter as well as cerebrospinal fluid (CSF) classification enabled automatic prior-based tissue segmentation using statistical parametric mapping (SPM). Overall, a positive correlation of GM volume and BW explained about 15% of the variance of GM while a positive correlation between WM and age was found. Absolute tissue volume differences were not detected, indeed ewes showed significantly more GM per bodyweight as compared to neutered rams. The created framework including spatial brain template and TPM represent a useful tool for unbiased automatic image preprocessing and morphological characterization in sheep. Therefore, the reported results may serve as a starting point for further experimental and/or translational research aiming at in vivo analysis in this species.
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Affiliation(s)
- Björn Nitzsche
- Department of Cell Therapy, Fraunhofer Institute for Cell Therapy and Immunology Leipzig, Germany ; Faculty of Veterinary Medicine, Institute of Anatomy, Histology and Embryology, University of Leipzig Leipzig, Germany
| | - Stephen Frey
- McConnell Brain Imaging Centre, Montreal Neurological Institute and Hospital, McGill University Montreal, QC, Canada
| | - Louis D Collins
- McConnell Brain Imaging Centre, Montreal Neurological Institute and Hospital, McGill University Montreal, QC, Canada
| | - Johannes Seeger
- Faculty of Veterinary Medicine, Institute of Anatomy, Histology and Embryology, University of Leipzig Leipzig, Germany
| | - Donald Lobsien
- Department of Neuroradiology, University Hospital of Leipzig Leipzig, Germany
| | - Antje Dreyer
- Department of Cell Therapy, Fraunhofer Institute for Cell Therapy and Immunology Leipzig, Germany ; Translational Centre for Regenerative Medicine, University of Leipzig Leipzig, Germany
| | - Holger Kirsten
- Department of Cell Therapy, Fraunhofer Institute for Cell Therapy and Immunology Leipzig, Germany ; Faculty of Medicine, Institute for Medical Informatics, Statistics and Epidemiology, University of Leipzig Leipzig, Germany ; LIFE Center (Leipzig Interdisciplinary Research Cluster of Genetic Factors, Phenotypes and Environment), University of Leipzig Leipzig, Germany
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern Bern, Switzerland
| | - Vladimir S Fonov
- McConnell Brain Imaging Centre, Montreal Neurological Institute and Hospital, McGill University Montreal, QC, Canada
| | - Johannes Boltze
- Department of Cell Therapy, Fraunhofer Institute for Cell Therapy and Immunology Leipzig, Germany ; Translational Centre for Regenerative Medicine, University of Leipzig Leipzig, Germany ; Neurovascular Regulation Laboratory at Neuroscience Center, Massachusetts General Hospital and Harvard Medical School Charlestown, MA, USA
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Henke D, Rupp S, Gaschen V, Stoffel MH, Frey J, Vandevelde M, Oevermann A. Listeria monocytogenes spreads within the brain by actin-based intra-axonal migration. Infect Immun 2015; 83:2409-19. [PMID: 25824833 PMCID: PMC4432752 DOI: 10.1128/iai.00316-15] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 03/22/2015] [Indexed: 02/05/2023] Open
Abstract
Listeria monocytogenes rhombencephalitis is a severe progressive disease despite a swift intrathecal immune response. Based on previous observations, we hypothesized that the disease progresses by intra-axonal spread within the central nervous system. To test this hypothesis, neuroanatomical mapping of lesions, immunofluorescence analysis, and electron microscopy were performed on brains of ruminants with naturally occurring rhombencephalitis. In addition, infection assays were performed in bovine brain cell cultures. Mapping of lesions revealed a consistent pattern with a preferential affection of certain nuclear areas and white matter tracts, indicating that Listeria monocytogenes spreads intra-axonally within the brain along interneuronal connections. These results were supported by immunofluorescence and ultrastructural data localizing Listeria monocytogenes inside axons and dendrites associated with networks of fibrillary structures consistent with actin tails. In vitro infection assays confirmed that bacteria were moving within axon-like processes by employing their actin tail machinery. Remarkably, in vivo, neutrophils invaded the axonal space and the axon itself, apparently by moving between split myelin lamellae of intact myelin sheaths. This intra-axonal invasion of neutrophils was associated with various stages of axonal degeneration and bacterial phagocytosis. Paradoxically, the ensuing adaxonal microabscesses appeared to provide new bacterial replication sites, thus supporting further bacterial spread. In conclusion, intra-axonal bacterial migration and possibly also the innate immune response play an important role in the intracerebral spread of the agent and hence the progression of listeric rhombencephalitis.
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Affiliation(s)
- Diana Henke
- Division of Neurological Sciences, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Sebastian Rupp
- Division of Neurological Sciences, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
| | - Véronique Gaschen
- Division of Veterinary Anatomy, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Joachim Frey
- Institute of Veterinary Bacteriology, Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Marc Vandevelde
- Division of Neurological Sciences, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Anna Oevermann
- Division of Neurological Sciences, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland
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Bürki S, Gaschen V, Stoffel MH, Stojiljkovic A, Frey J, Kuehni-Boghenbor K, Pilo P. Invasion and persistence of Mycoplasma bovis in embryonic calf turbinate cells. Vet Res 2015; 46:53. [PMID: 25976415 PMCID: PMC4432498 DOI: 10.1186/s13567-015-0194-z] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2014] [Accepted: 04/27/2015] [Indexed: 01/11/2023] Open
Abstract
Mycoplasma bovis is a wall-less bacterium causing bovine mycoplasmosis, a disease showing a broad range of clinical manifestations in cattle. It leads to enormous economic losses to the beef and dairy industries. Antibiotic treatments are not efficacious and currently no efficient vaccine is available. Moreover, mechanisms of pathogenicity of this bacterium are not clear, as few virulence attributes are known. Microscopic observations of necropsy material suggest the possibility of an intracellular stage of M. bovis. We used a combination of a gentamicin protection assay, a variety of chemical treatments to block mycoplasmas entry in eukaryotic cells, and fluorescence and transmission electron microscopy to investigate the intracellular life of M. bovis in calf turbinate cells. Our findings indicate that M. bovis invades and persists in primary embryonic calf turbinate cells. Moreover, M. bovis can multiply within these cells. The intracellular phase of M. bovis may represent a protective niche for this pathogen and contribute to its escape from the host’s immune defense as well as avoidance of antimicrobial agents.
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Affiliation(s)
- Sibylle Bürki
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Bern, Switzerland. .,Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland.
| | - Véronique Gaschen
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - Ana Stojiljkovic
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - Joachim Frey
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | | | - Paola Pilo
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
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Stroka D, Keogh A, Vu D, Fort A, Stoffel MH, Kühni-Boghenbor K, Furer C, Banz V, Demarmels Biasiutti F, Lämmle B, Candinas D, Neerman-Arbez M. In vitro rescue of FGA deletion by lentiviral transduction of an afibrinogenemic patient's hepatocytes. J Thromb Haemost 2014; 12:1874-9. [PMID: 25163824 DOI: 10.1111/jth.12714] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 08/06/2014] [Indexed: 11/29/2022]
Abstract
BACKGROUND Congenital afibrinogenemia is a rare inherited autosomal recessive disorder in which a mutation in one of three genes coding for the fibrinogen polypeptide chains Aα, Bβ and γ results in the absence of a functional coagulation protein. A patient with congenital afibrinogenemia, resulting from an FGA homozygous gene deletion, underwent an orthotopic liver transplant that resulted in complete restoration of normal hemostasis. The patient's explanted liver provided a unique opportunity to further investigate a potential novel treatment modality. OBJECTIVE To explore a targeted gene therapy approach for patients with congenital afibrinogenemia. METHODS AND RESULTS At the time of transplant, the patient's FGA-deficient hepatocytes were isolated and transduced with lentiviral vectors encoding the human fibrinogen Aα-chain. FGA-transduced hepatocytes produced fully functional fibrinogen in vitro. CONCLUSIONS Orthotopic liver transplantation is a possible rescue treatment for failure of on-demand fibrinogen replacement therapy. In addition, we provide evidence that hepatocytes homozygous for a large FGA deletion can be genetically modified to restore Aα-chain protein expression and secrete a functional fibrinogen hexamer.
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Affiliation(s)
- D Stroka
- Clinic for Visceral Surgery and Medicine, Department of Clinical Research, Bern University Hospital, University of Bern, Bern, Germany
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Staudacher A, Oevermann A, Stoffel MH, Gorgas D. Validation of a magnetic resonance imaging guided stereotactic access to the ovine brainstem. BMC Vet Res 2014; 10:216. [PMID: 25241810 PMCID: PMC4177427 DOI: 10.1186/s12917-014-0216-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 09/10/2014] [Indexed: 11/10/2022] Open
Abstract
Background Anatomical differences between humans and domestic mammals preclude the use of reported stereotactic approaches to the brainstem in animals. In animals, brainstem biopsies are required both for histopathological diagnosis of neurological disorders and for research purposes. Sheep are used as a translational model for various types of brain disease and therefore a species-specific approach needs to be developed. The aim of the present study was to establish a minimally invasive, accurate and reproducible stereotactic approach to the brainstem of sheep, using the magnetic resonance imaging guided BrainsightTM frameless stereotactic system. Results A transoccipital transcerebellar approach with an entry point in the occipital bone above the vermis between the transverse sinus and the external occipital protuberance was chosen. This approach provided access to the target site in all heads. The overall mean needle placement error was 1.85 ± 1.22 mm. Conclusions The developed transoccipital transcerebellar route is short, provides accurate access to the ovine caudal cranial fossa and is a promising approach to be further assessed in live animals.
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Affiliation(s)
| | | | | | - Daniela Gorgas
- Division of Clinical Radiology, Department of Clinical Veterinary Medicine, Vetsuisse-Faculty, University of Berne, Längassstrasse 128, Berne, CH 3012, Switzerland.
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Hoffmann A, Stoffel MH, Nitzsche B, Lobsien D, Seeger J, Schneider H, Boltze J. The ovine cerebral venous system: comparative anatomy, visualization, and implications for translational research. PLoS One 2014; 9:e92990. [PMID: 24736654 PMCID: PMC3988027 DOI: 10.1371/journal.pone.0092990] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 02/27/2014] [Indexed: 12/03/2022] Open
Abstract
Cerebrovascular diseases are significant causes of death and disability in humans. Improvements in diagnostic and therapeutic approaches strongly rely on adequate gyrencephalic, large animal models being demanded for translational research. Ovine stroke models may represent a promising approach but are currently limited by insufficient knowledge regarding the venous system of the cerebral angioarchitecture. The present study was intended to provide a comprehensive anatomical analysis of the intracranial venous system in sheep as a reliable basis for the interpretation of experimental results in such ovine models. We used corrosion casts as well as contrast-enhanced magnetic resonance venography to scrutinize blood drainage from the brain. This combined approach yielded detailed and, to some extent, novel findings. In particular, we provide evidence for chordae Willisii and lateral venous lacunae, and report on connections between the dorsal and ventral sinuses in this species. For the first time, we also describe venous confluences in the deep cerebral venous system and an ‘anterior condylar confluent’ as seen in humans. This report provides a detailed reference for the interpretation of venous diagnostic imaging findings in sheep, including an assessment of structure detectability by in vivo (imaging) versus ex vivo (corrosion cast) visualization methods. Moreover, it features a comprehensive interspecies-comparison of the venous cerebral angioarchitecture in man, rodents, canines and sheep as a relevant large animal model species, and describes possible implications for translational cerebrovascular research.
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Affiliation(s)
- Anke Hoffmann
- Institute of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Michael H. Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Björn Nitzsche
- Fraunhofer Institute of Cell Therapy and Immunology, Department of Cell Therapy, Leipzig, Germany
| | - Donald Lobsien
- Department of Neuroradiology, University Hospital of Leipzig, Leipzig, Germany
| | - Johannes Seeger
- Institute of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Holm Schneider
- Department of Pediatrics, University Hospital Erlangen, Erlangen, Germany
| | - Johannes Boltze
- Fraunhofer Institute of Cell Therapy and Immunology, Department of Cell Therapy, Leipzig, Germany
- Translational Centre for Regenerative Medicine, University of Leipzig, Leipzig, Germany
- Massachusetts General Hospital and Harvard Medical School, Neurovascular Regulation Laboratory at Neuroscience Center, Charlestown, Massachusetts, United States of America
- * E-mail:
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Kramer AH, Doherr MG, Stoffel MH, Steiner A, Spadavecchia C. Ultrasound-guided proximal paravertebral anaesthesia in cattle. Vet Anaesth Analg 2014; 41:534-42. [PMID: 24575819 DOI: 10.1111/vaa.12148] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2013] [Accepted: 01/10/2013] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To develop and evaluate a method for ultrasound-guidance in performing the proximal paravertebral block for flank anaesthesia in cattle through a cadaveric study, followed by clinical application. STUDY DESIGN prospective experimental cadaveric study and clinical series. ANIMALS Previously frozen lumbar sections of cows without known spinal abnormalities were used. The clinical case group comprised of ten animals for which a right flank laparotomy was indicated. METHODS Twenty cow cadavers were used to perform ultrasound-guided bilateral injections of 1.0 mL dye (1.0 mL 1% Toluidine Blue in 1% Borax) at the intervertebral foramen at the level of T13, L1 and L2 spinal nerves. Distance and depth of injection, staining of the dorsal and ventral nerve branches, and deviation from the target were evaluated. The investigator's confidence as to visualisation and expected success at staining the nerve was assessed. Ten clinical cases received the ultrasound-guided proximal paravertebral anaesthesia. Analgesic success was evaluated using a 4-grade scoring system at 10 minutes after the injection and during surgery, respectively. Categorical variables were described using frequencies and proportions. RESULTS Both dorsal and ventral branches of the spinal nerves T13, L1 or L2 were at least partially stained in 41% of injections, while in 77% of injections one of the branches was stained. Five out of ten clinical cases had a satisfactory anaesthesia. There was no significant association between confidence at injection and either staining or analgesic success. CONCLUSION Results from the cadaveric and clinical study suggest no significant improvement using ultrasound guidance to perform proximal paravertebral block in cows compared to our previous clinical experience and to references in the literature using the blind method. CLINICAL RELEVANCE Further research should be conducted to improve the ultrasound-guided technique described in this study.
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Affiliation(s)
- Anne H Kramer
- Ruminant Clinic, Vetsuisse Faculty, University of Bern, Berne, Switzerland
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Abstract
The sheep is a popular animal model for human biomechanical research involving invasive surgery on the hind limb. These painful procedures can only be ethically justified with the application of adequate analgesia protocols. Regional anaesthesia as an adjunct to general anaesthesia may markedly improve well-being of these experimental animals during the postoperative period due to a higher analgesic efficacy when compared with systemic drugs, and may therefore reduce stress and consequently the severity of such studies. As a first step 14 sheep cadavers were used to establish a new technique for the peripheral blockade of the sciatic and the femoral nerves under sonographic guidance and to evaluate the success rate by determination of the colorization of both nerves after an injection of 0.5 mL of a 0.1% methylene blue solution. First, both nerves were visualized sonographically. Then, methylene blue solution was injected and subsequently the length of colorization was measured by gross anatomical dissection of the target nerves. Twenty-four sciatic nerves were identified sonographically in 12 out of 13 cadavers. In one animal, the nerve could not be ascertained unequivocally and, consequently, nerve colorization failed. Twenty femoral nerves were located by ultrasound in 10 out of 13 cadavers. In three cadavers, signs of autolysis impeded the scan. This study provides a detailed anatomical description of the localization of the sciatic and the femoral nerves and presents an effective and safe yet simple and rapid technique for performing peripheral nerve blocks with a high success rate.
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Affiliation(s)
- Sonja Waag
- Orthopaedic Center for Musculoskeletal Research, Department of Orthopaedic Surgery, Koenig-Ludwig-Haus, Julius-Maximilians-University, Wuerzburg, Germany
| | - Michael H Stoffel
- Division of Veterinary Anatomy, Vetsuisse Faculty University of Bern, Switzerland
| | - Claudia Spadavecchia
- Vetsuisse Faculty, Department of Clinical Veterinary Medicine, Anaesthesia Department, Bern, Switzerland
| | - Urs Eichenberger
- Department of Anaesthesia, Intensive Care and Pain Medicine, St Anna Clinic, Lucerne, Switzerland
| | - Helene Rohrbach
- Vetsuisse Faculty, Department of Clinical Veterinary Medicine, Anaesthesia Department, Bern, Switzerland
- Graduate School for Cellular and Biomedical Sciences, University of Bern, Switzerland
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Adami C, Angeli G, Haenssgen K, Stoffel MH, Spadavecchia C. Development of an ultrasound-guided technique for pudendal nerve block in cat cadavers. J Feline Med Surg 2013; 15:901-7. [PMID: 23599255 DOI: 10.1177/1098612x13485482] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The objective of this prospective experimental cadaveric study was to develop an ultrasound-guided technique to perform an anaesthetic pudendal nerve block in male cats. Fifteen fresh cadavers were used for this trial. A detailed anatomical dissection was performed on one cat in order to scrutinise the pudendal nerve and its ramifications. In a second step, the cadavers of six cats were used to test three different ultrasonographic approaches to the pudendal nerve: the deep dorso-lateral, the superficial dorso-lateral and the median transperineal. Although none of the approaches allowed direct ultrasonographical identification of the pudendal nerve branches, the deep dorso-lateral was found to be the most advantageous one in terms of practicability and ability to identify useful and reliable landmarks. Based on these findings, the deep dorso-lateral approach was selected as technique of choice for tracer injections (0.1 ml 1% methylene blue injected bilaterally) in six cat cadavers distinct from those used for the ultrasonographical study. Anatomical dissection revealed a homogeneous spread of the tracer around the pudendal nerve sensory branches in all six cadavers. Finally, computed tomography was performed in two additional cadavers after injection of 0.3 ml/kg (0.15 ml/kg per each injection sites, left and right) contrast medium through the deep dorso-lateral approach in order to obtain a model of volume distribution applicable to local anaesthetics. Our findings in cat cadavers indicate that ultrasound-guided pudendal nerve block is feasible and could be proposed to provide peri-operative analgesia in clinical patients undergoing perineal urethrostomy.
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Affiliation(s)
- Chiara Adami
- 1Department of Veterinary Clinical Science, Anesthesiology and Pain Therapy Division, Vetsuisse Faculty, University of Berne, Berne, Switzerland
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