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Merten AL, Schöler U, Guo Y, Linsenmeier F, Martinac B, Friedrich O, Schürmann S. High-content method for mechanosignaling studies using IsoStretcher technology and quantitative Ca 2+ imaging applied to Piezo1 in cardiac HL-1 cells. Cell Mol Life Sci 2024; 81:140. [PMID: 38485771 PMCID: PMC10940437 DOI: 10.1007/s00018-024-05159-6] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 01/31/2024] [Accepted: 02/04/2024] [Indexed: 03/18/2024]
Abstract
The importance of mechanosensory transduction pathways in cellular signalling has prominently come to focus in the last decade with the discovery of the Piezo ion channel family. Mechanosignaling involving Piezo1 ion channels in the function of the heart and cardiovascular system has only recently been identified to have implications for cardiovascular physiology and pathophysiology, in particular for heart failure (i.e., hypertrophy or dilative cardiomyopathy). These results have emphasized the need for higher throughput methods to study single-cell cardiovascular mechanobiology with the aim of identifying new targets for therapeutic interventions and stimulating the development of new pharmacological agents. Here, we present a novel method to assess mechanosignaling in adherent cardiac cells (murine HL-1 cell line) using a combination of isotropic cell stretch application and simultaneous Ca2+ fluorescence readout with quantitative analysis. The procedure implements our IsoStretcher technology in conjunction with a single-cell- and population-based analysis of Ca2+ signalling by means of automated image registration, cell segmentation and analysis, followed by automated classification of single-cell responses. The method is particularly valuable for assessing the heterogeneity of populations with distinct cellular responses to mechanical stimulation and provides more user-independent unbiased drug response classifications.
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Affiliation(s)
- Anna-Lena Merten
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Str. 3, 91052, Erlangen, Germany
- School in Advanced Optical Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Paul-Gordan-Str. 6, 91052, Erlangen, Germany
| | - Ulrike Schöler
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Str. 3, 91052, Erlangen, Germany
- School in Advanced Optical Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Paul-Gordan-Str. 6, 91052, Erlangen, Germany
| | - Yang Guo
- Victor Chang Cardiac Research Institute, 405 Liverpool St, Darlinghurst, NSW, 2010, Australia
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, University of New South Wales, Darlinghurst, NSW, 2010, Australia
| | - Fabian Linsenmeier
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Str. 3, 91052, Erlangen, Germany
| | - Boris Martinac
- Victor Chang Cardiac Research Institute, 405 Liverpool St, Darlinghurst, NSW, 2010, Australia
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, University of New South Wales, Darlinghurst, NSW, 2010, Australia
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Str. 3, 91052, Erlangen, Germany
- School in Advanced Optical Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Paul-Gordan-Str. 6, 91052, Erlangen, Germany
- Victor Chang Cardiac Research Institute, 405 Liverpool St, Darlinghurst, NSW, 2010, Australia
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Str. 3, 91052, Erlangen, Germany.
- School in Advanced Optical Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Paul-Gordan-Str. 6, 91052, Erlangen, Germany.
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2
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Schulz-Kuhnt A, Rühle K, Javidmehr A, Döbrönti M, Biwank J, Knittel S, Neidlinger P, Leupold J, Liu LJ, Dedden M, Taudte RV, Gessner A, Fromm MF, Mielenz D, Kreiss L, Waldner MJ, Schürmann S, Friedrich O, Dietel B, López-Posadas R, Plattner C, Zundler S, Becker C, Atreya R, Neurath MF, Atreya I. ATP citrate lyase (ACLY)-dependent immunometabolism in mucosal T cells drives experimental colitis in vivo. Gut 2024; 73:601-612. [PMID: 38176897 DOI: 10.1136/gutjnl-2023-330543] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 12/12/2023] [Indexed: 01/06/2024]
Abstract
OBJECTIVE Mucosal T cells play a major role in inflammatory bowel disease (IBD). However, their immunometabolism during intestinal inflammation is poorly understood. Due to its impact on cellular metabolism and proinflammatory immune cell function, we here focus on the enzyme ATP citrate lyase (ACLY) in mucosal T cell immunometabolism and its relevance for IBD. DESIGN ACLY expression and its immunometabolic impact on colitogenic T cell function were analysed in mucosal T cells from patients with IBD and in two experimental colitis models. RESULTS ACLY was markedly expressed in colon tissue under steady-state conditions but was significantly downregulated in lamina propria mononuclear cells in experimental dextran sodium sulfate-induced colitis and in CD4+ and to a lesser extent in CD8+ T cells infiltrating the inflamed gut in patients with IBD. ACLY-deficient CD4+ T cells showed an impaired capacity to induce intestinal inflammation in a transfer colitis model as compared with wild-type T cells. Assessment of T cell immunometabolism revealed that ACLY deficiency dampened the production of IBD-relevant cytokines and impaired glycolytic ATP production but enriched metabolites involved in the biosynthesis of phospholipids and phosphatidylcholine. Interestingly, the short-chain fatty acid butyrate was identified as a potent suppressor of ACLY expression in T cells, while IL-36α and resolvin E1 induced ACLY levels. In a translational approach, in vivo administration of the butyrate prodrug tributyrin downregulated mucosal infiltration of ACLYhigh CD4+ T cells and ameliorated chronic colitis. CONCLUSION ACLY controls mucosal T cell immunometabolism and experimental colitis. Therapeutic modulation of ACLY expression in T cells emerges as a novel strategy to promote the resolution of intestinal inflammation.
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Affiliation(s)
- Anja Schulz-Kuhnt
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Current address: Bionorica SE, Neumarkt in der Oberpfalz, Germany
| | - Katharina Rühle
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Asal Javidmehr
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Michael Döbrönti
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Jana Biwank
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Selina Knittel
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Peter Neidlinger
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Jannik Leupold
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Li-Juan Liu
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Mark Dedden
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Regina Verena Taudte
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Core Facility for Metabolomics, Department of Medicine, Philipps-Universität Marburg, Marburg, Germany
| | - Arne Gessner
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Martin F Fromm
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Dirk Mielenz
- Division of Molecular Immunology, Department of Internal Medicine 3, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Lucas Kreiss
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Maximilian J Waldner
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Barbara Dietel
- Department of Medicine 2 - Cardiology and Angiology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Rocío López-Posadas
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Deutsches Zentrum Immuntherapie DZI, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christina Plattner
- Institute for Bioinformatics, Medical University of Innsbruck, Innsbruck, Austria
| | - Sebastian Zundler
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christoph Becker
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Raja Atreya
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Markus F Neurath
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Deutsches Zentrum Immuntherapie DZI, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Imke Atreya
- Department of Medicine 1, University Hospital of Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Deutsches Zentrum Immuntherapie DZI, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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Mühlberg A, Ritter P, Langer S, Goossens C, Nübler S, Schneidereit D, Taubmann O, Denzinger F, Nörenberg D, Haug M, Schürmann S, Horstmeyer R, Maier AK, Goldmann WH, Friedrich O, Kreiss L. SEMPAI: a Self-Enhancing Multi-Photon Artificial Intelligence for Prior-Informed Assessment of Muscle Function and Pathology. Adv Sci (Weinh) 2023; 10:e2206319. [PMID: 37582656 PMCID: PMC10558688 DOI: 10.1002/advs.202206319] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 06/30/2023] [Indexed: 08/17/2023]
Abstract
Deep learning (DL) shows notable success in biomedical studies. However, most DL algorithms work as black boxes, exclude biomedical experts, and need extensive data. This is especially problematic for fundamental research in the laboratory, where often only small and sparse data are available and the objective is knowledge discovery rather than automation. Furthermore, basic research is usually hypothesis-driven and extensive prior knowledge (priors) exists. To address this, the Self-Enhancing Multi-Photon Artificial Intelligence (SEMPAI) that is designed for multiphoton microscopy (MPM)-based laboratory research is presented. It utilizes meta-learning to optimize prior (and hypothesis) integration, data representation, and neural network architecture simultaneously. By this, the method allows hypothesis testing with DL and provides interpretable feedback about the origin of biological information in 3D images. SEMPAI performs multi-task learning of several related tasks to enable prediction for small datasets. SEMPAI is applied on an extensive MPM database of single muscle fibers from a decade of experiments, resulting in the largest joint analysis of pathologies and function for single muscle fibers to date. It outperforms state-of-the-art biomarkers in six of seven prediction tasks, including those with scarce data. SEMPAI's DL models with integrated priors are superior to those without priors and to prior-only approaches.
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Affiliation(s)
- Alexander Mühlberg
- Institute of Medical BiotechnologyDepartment of Chemical and Biological EngineeringFriedrich‐Alexander University Erlangen‐NurembergPaul‐Gordan‐Str. 391052ErlangenGermany
| | - Paul Ritter
- Institute of Medical BiotechnologyDepartment of Chemical and Biological EngineeringFriedrich‐Alexander University Erlangen‐NurembergPaul‐Gordan‐Str. 391052ErlangenGermany
- Erlangen Graduate School in Advanced Optical TechnologiesPaul‐Gordan‐Str. 691052ErlangenGermany
| | - Simon Langer
- Pattern Recognition LabDepartment of Computer ScienceFriedrich‐Alexander University Erlangen‐NurembergMartensstr. 391058ErlangenGermany
| | - Chloë Goossens
- Clinical Division and Laboratory of Intensive Care MedicineKU LeuvenUZ Herestraat 49 – P.O. box 7003Leuven3000Belgium
| | - Stefanie Nübler
- Institute of Medical BiotechnologyDepartment of Chemical and Biological EngineeringFriedrich‐Alexander University Erlangen‐NurembergPaul‐Gordan‐Str. 391052ErlangenGermany
| | - Dominik Schneidereit
- Institute of Medical BiotechnologyDepartment of Chemical and Biological EngineeringFriedrich‐Alexander University Erlangen‐NurembergPaul‐Gordan‐Str. 391052ErlangenGermany
- Erlangen Graduate School in Advanced Optical TechnologiesPaul‐Gordan‐Str. 691052ErlangenGermany
| | - Oliver Taubmann
- Pattern Recognition LabDepartment of Computer ScienceFriedrich‐Alexander University Erlangen‐NurembergMartensstr. 391058ErlangenGermany
| | - Felix Denzinger
- Pattern Recognition LabDepartment of Computer ScienceFriedrich‐Alexander University Erlangen‐NurembergMartensstr. 391058ErlangenGermany
| | - Dominik Nörenberg
- Department of Radiology and Nuclear MedicineUniversity Medical Center MannheimMedical Faculty MannheimTheodor‐Kutzer‐Ufer 1–368167MannheimGermany
| | - Michael Haug
- Institute of Medical BiotechnologyDepartment of Chemical and Biological EngineeringFriedrich‐Alexander University Erlangen‐NurembergPaul‐Gordan‐Str. 391052ErlangenGermany
| | - Sebastian Schürmann
- Institute of Medical BiotechnologyDepartment of Chemical and Biological EngineeringFriedrich‐Alexander University Erlangen‐NurembergPaul‐Gordan‐Str. 391052ErlangenGermany
| | - Roarke Horstmeyer
- Computational Optics LabDepartment of Biomedical EngineeringDuke University101 Science DrDurhamNC27708USA
| | - Andreas K. Maier
- Pattern Recognition LabDepartment of Computer ScienceFriedrich‐Alexander University Erlangen‐NurembergMartensstr. 391058ErlangenGermany
| | - Wolfgang H. Goldmann
- Biophysics GroupDepartment of PhysicsFriedrich‐Alexander University Erlangen‐NurembergHenkestr. 9191052ErlangenGermany
| | - Oliver Friedrich
- Institute of Medical BiotechnologyDepartment of Chemical and Biological EngineeringFriedrich‐Alexander University Erlangen‐NurembergPaul‐Gordan‐Str. 391052ErlangenGermany
- Erlangen Graduate School in Advanced Optical TechnologiesPaul‐Gordan‐Str. 691052ErlangenGermany
| | - Lucas Kreiss
- Institute of Medical BiotechnologyDepartment of Chemical and Biological EngineeringFriedrich‐Alexander University Erlangen‐NurembergPaul‐Gordan‐Str. 391052ErlangenGermany
- Erlangen Graduate School in Advanced Optical TechnologiesPaul‐Gordan‐Str. 691052ErlangenGermany
- Computational Optics LabDepartment of Biomedical EngineeringDuke University101 Science DrDurhamNC27708USA
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4
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Sommer K, Heidbreder K, Kreiss L, Dedden M, Paap EM, Wiendl M, Becker E, Atreya R, Müller TM, Atreya I, Waldner M, Schürmann S, Friedrich O, Neurath MF, Zundler S. Anti-β7 integrin treatment impedes the recruitment on non-classical monocytes to the gut and delays macrophage-mediated intestinal wound healing. Clin Transl Med 2023; 13:e1233. [PMID: 37029786 PMCID: PMC10082567 DOI: 10.1002/ctm2.1233] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 03/15/2023] [Accepted: 03/21/2023] [Indexed: 04/09/2023] Open
Abstract
BACKGROUND Closing mucosal defects to reach mucosal healing is an important goal of therapy in inflammatory bowel disease (IBD). Among other cells, monocyte-derived macrophages are centrally involved in such intestinal wound healing. We had previously demonstrated that the anti-α4β7 integrin antibody vedolizumab blocks the recruitment of non-classical monocytes as biased progenitors of wound healing macrophages to the gut and delays wound healing. However, although important for the interpretation of disappointing results in recent phase III trials in IBD, the effects of the anti-β7 antibody etrolizumab on wound healing are unclear so far. METHODS We analyzed the expression of etrolizumab targets on human and mouse monocyte subsets by flow cytometry and assessed their function in adhesion and homing assays. We explored wound-associated monocyte recruitment dynamics with multi-photon microscopy and compared the effects of etrolizumab and vedolizumab surrogate (-s) antibodies on experimental wound healing and wound-associated macrophage abundance. Finally, we investigated wound healing macrophage signatures in the large intestinal transcriptome of patients with Crohn's disease treated with etrolizumab. RESULTS Human and mouse non-classical monocytes expressed more αEβ7 integrin than classical monocytes and were a target of etrolizumab-s, which blocked non-classical monocyte adhesion to MAdCAM-1 and E-Cadherin as well as gut homing in vivo. Intestinal wound healing was delayed on treatment with etrolizumab-s along with a reduction of peri-lesional wound healing macrophages. Wound healing macrophage signatures in the colon of patients with Crohn's disease were substantially down-regulated on treatment with etrolizumab, but not with placebo. CONCLUSIONS Combined blockade of αEβ7 and α4β7 with etrolizumab seems to exceed the effect of anti-α4β7 treatment on intestinal wound healing, which might help to inform further investigations to understand the recent observations in the etrolizumab phase III trial program.
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Affiliation(s)
- Katrin Sommer
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Karin Heidbreder
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Lucas Kreiss
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering (CBI), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Mark Dedden
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Eva-Maria Paap
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Maximilian Wiendl
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Emily Becker
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Raja Atreya
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Deutsches Zentrum Immuntherapie (DZI), University Hospital Erlangen, Erlangen, Germany
| | - Tanja M Müller
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Deutsches Zentrum Immuntherapie (DZI), University Hospital Erlangen, Erlangen, Germany
| | - Imke Atreya
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Deutsches Zentrum Immuntherapie (DZI), University Hospital Erlangen, Erlangen, Germany
| | - Maximilian Waldner
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Deutsches Zentrum Immuntherapie (DZI), University Hospital Erlangen, Erlangen, Germany
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering (CBI), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Oliver Friedrich
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Markus F Neurath
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Deutsches Zentrum Immuntherapie (DZI), University Hospital Erlangen, Erlangen, Germany
| | - Sebastian Zundler
- Department of Medicine, University Hospital Erlangen and Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Deutsches Zentrum Immuntherapie (DZI), University Hospital Erlangen, Erlangen, Germany
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5
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Schöler U, Merten AL, Schürmann S, Friedrich O. Quantitative Live-Cell Ca 2+ Imaging During Isotropic Cell Stretch. Methods Mol Biol 2023; 2644:155-176. [PMID: 37142921 DOI: 10.1007/978-1-0716-3052-5_10] [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] [Indexed: 05/06/2023]
Abstract
Cell viability of many cell types strongly relies on their ability to adjust to mechanical conditions and alterations. Cellular mechanisms for sensing and responding to mechanical forces and pathophysiological variations in these processes have become an emerging research field in recent years. An important signaling molecule involved in mechanotransduction as in many cellular processes is Ca2+. New experimental methods to probe cellular Ca2+ signaling live under conditions of mechanical stimulation facilitate new insights into previously overlooked aspects of mechanical regulation of cells.Here, we describe a protocol for using Ca2+ imaging in combination with a cell stretching device, the IsoStretcher. Cells grown on elastic membranes can be isotopically stretched in-plane, and their intracellular Ca2+ level can be accessed online on the single cell level using fluorescent calcium indicator dyes. We show a protocol for functional screening of mechanosensitive ion channels and related drug screenings using BJ cells, a foreskin fibroblast cell line that strongly reacts to acute mechanical stimulation.
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Affiliation(s)
- Ulrike Schöler
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
| | - Anna-Lena Merten
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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6
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Kreiss L, Ganzleben I, Mühlberg A, Ritter P, Schneidereit D, Becker C, Neurath MF, Friedrich O, Schürmann S, Waldner M. Label-free analysis of inflammatory tissue remodeling in murine lung tissue based on multiphoton microscopy, Raman spectroscopy and machine learning. J Biophotonics 2022; 15:e202200073. [PMID: 35611635 DOI: 10.1002/jbio.202200073] [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] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 05/19/2022] [Accepted: 05/20/2022] [Indexed: 06/15/2023]
Abstract
Inflammatory fibrotic tissue remodeling can lead to severe morbidity. Histopathology grading requires extraction of biopsies and elaborate tissue processing. Label-free optical technologies can provide diagnostic readout without preparation and artificial stainings and show potential for in vivo applications. Here, we present an integration of Raman spectroscopy (RS) and multiphoton microscopy for joint investigation of the bio-chemical composition and morphological features related to cellular components and connective tissue. Both modalities show that collagen signatures were significantly increased in a murine fibrosis model. Furthermore, autofluorescence signatures assigned to immune cells show high correlation with disease severity. RS indicates increased levels of elastin and lipids. Further, we investigated the effect of joint data sets on prediction performance in machine learning models. Although binary classification did not benefit from adding more features, multi-class classification was improved by integrated data sets.
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Affiliation(s)
- Lucas Kreiss
- Institute of Medical Biotechnology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
- Department of Medicine 1, University Hospital, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Ingo Ganzleben
- Department of Medicine 1, University Hospital, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Ludwig Demling Center for Molecular Imaging, Department of Medicine 1, University Hospital, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Alexander Mühlberg
- Institute of Medical Biotechnology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Paul Ritter
- Institute of Medical Biotechnology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Dominik Schneidereit
- Institute of Medical Biotechnology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christoph Becker
- Department of Medicine 1, University Hospital, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Markus F Neurath
- Department of Medicine 1, University Hospital, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Ludwig Demling Center for Molecular Imaging, Department of Medicine 1, University Hospital, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Maximilian Waldner
- Department of Medicine 1, University Hospital, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- Ludwig Demling Center for Molecular Imaging, Department of Medicine 1, University Hospital, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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7
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Kreiss L, Thoma OM, Lemire S, Lechner K, Carlé B, Dilipkumar A, Kunert T, Scheibe K, Heichler C, Merten AL, Weigmann B, Neufert C, Hildner K, Vieth M, Neurath MF, Friedrich O, Schürmann S, Waldner MJ. Label-Free Characterization and Quantification of Mucosal Inflammation in Common Murine Colitis Models With Multiphoton Imaging. Inflamm Bowel Dis 2022; 28:1637-1646. [PMID: 35699622 PMCID: PMC9629455 DOI: 10.1093/ibd/izac114] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND Clinical challenges in inflammatory bowel diseases require microscopic in vivo evaluation of inflammation. Here, label-free imaging holds great potential, and recently, our group demonstrated the advantage of using in vivo multiphoton endomicroscopy for longitudinal animal studies. This article extends our previous work by in-depth analysis of label-free tissue features in common colitis models quantified by the multiphoton colitis score (MCS). METHODS Fresh mucosal tissues were evaluated from acute and chronic dextran sulfate sodium (DSS), TNBS, oxazolone, and transfer colitis. Label-free imaging was performed by using second harmonic generation and natural autofluorescence. Morphological changes in mucosal crypts, collagen fibers, and cellularity in the stroma were analyzed and graded. RESULTS Our approach discriminated between healthy (mean MCS = 2.5) and inflamed tissue (mean MCS > 5) in all models, and the MCS was validated by hematoxylin and eosin scoring of the same samples (85.2% agreement). Moreover, specific characteristics of each phenotype were identified. While TNBS, oxazolone, and transfer colitis showed high cellularity in stroma, epithelial damage seemed specific for chronic, acute DSS and transfer colitis. Crypt deformations were mostly observed in acute DSS. CONCLUSIONS Quantification of label-free imaging is promising for in vivo endoscopy. In the future, this could be valuable for monitoring of inflammatory pathways in murine models, which is highly relevant for the development of new inflammatory bowel disease therapeutics.
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Affiliation(s)
- Lucas Kreiss
- Address correspondence to: Lucas Kreiss, Dr.-Ing, Institute of Medical Biotechnology, Paul-Gordan-Str 3, 91052 Erlangen, Germany ()
| | | | - Sarah Lemire
- Department of Medicine 1, University Hospital Erlangen, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Deutsches Zentrum Immuntherapie, Erlangen, Germany
| | - Kristina Lechner
- Department of Medicine 1, University Hospital Erlangen, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Deutsches Zentrum Immuntherapie, Erlangen, Germany
| | - Birgitta Carlé
- Institute of Medical Biotechnology, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany
| | - Ashwathama Dilipkumar
- Institute of Medical Biotechnology, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany
| | - Timo Kunert
- Department of Medicine 1, University Hospital Erlangen, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Deutsches Zentrum Immuntherapie, Erlangen, Germany
| | - Kristina Scheibe
- Department of Medicine 1, University Hospital Erlangen, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Deutsches Zentrum Immuntherapie, Erlangen, Germany
| | - Christina Heichler
- Department of Medicine 1, University Hospital Erlangen, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Deutsches Zentrum Immuntherapie, Erlangen, Germany
| | - Anna-Lena Merten
- Institute of Medical Biotechnology, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany
| | - Benno Weigmann
- Department of Medicine 1, University Hospital Erlangen, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Deutsches Zentrum Immuntherapie, Erlangen, Germany
| | - Clemens Neufert
- Department of Medicine 1, University Hospital Erlangen, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Deutsches Zentrum Immuntherapie, Erlangen, Germany
| | - Kai Hildner
- Department of Medicine 1, University Hospital Erlangen, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Deutsches Zentrum Immuntherapie, Erlangen, Germany
| | - Michael Vieth
- Institute of Pathology, Klinikum Bayreuth, Bayreuth, Germany,Institute of Pathology, University Hospital Erlangen, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany
| | - Markus F Neurath
- Department of Medicine 1, University Hospital Erlangen, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Deutsches Zentrum Immuntherapie, Erlangen, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany,Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander UniversityErlangen-Nürnberg, Erlangen, Germany
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Lemire S, Thoma OM, Kreiss L, Völkl S, Friedrich O, Neurath MF, Schürmann S, Waldner MJ. Natural NADH and FAD Autofluorescence as Label-Free Biomarkers for Discriminating Subtypes and Functional States of Immune Cells. Int J Mol Sci 2022; 23:ijms23042338. [PMID: 35216453 PMCID: PMC8880312 DOI: 10.3390/ijms23042338] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 02/17/2022] [Accepted: 02/17/2022] [Indexed: 01/27/2023] Open
Abstract
Immune cell activity is a major factor for disease progression in inflammatory bowel diseases (IBD). Classifying the type and functional state of immune cells is therefore crucial in clinical diagnostics of IBD. Label-free optical technologies exploiting NADH and FAD autofluorescence, such as multiphoton microscopy, have been used to describe tissue morphology in healthy and inflamed colon samples. Nevertheless, a strategy for the identification of single immune cell subtypes within the tissue is yet to be developed. This work aims to initiate an understanding of autofluorescence changes depending on immune cell type and activation state. For this, NADH and FAD autofluorescence signals of different murine immune cell subtypes under native conditions, as well as upon in vitro stimulation and cell death, have been evaluated. Autofluorescence was assessed using flow cytometry and multiphoton microscopy. Our results reveal significantly increased NADH and FAD signals in innate immune cells compared to adaptive immune cells. This allowed identification of relative amounts of neutrophils and CD4+ T cells in mixed cell suspensions, by using NADH signals as a differentiation marker. Furthermore, in vitro stimulation significantly increased NADH and FAD autofluorescence in adaptive immune cells and macrophages. Cell death induced a significant drop in NADH autofluorescence, while FAD signals were hardly affected. Taken together, these results demonstrate the value of autofluorescence as a tool to characterize immune cells in different functional states, paving the way to the label-free clinical classification of IBD in the future.
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Affiliation(s)
- Sarah Lemire
- Department of Internal Medicine 1, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (O.-M.T.); (L.K.); (M.F.N.)
- Deutsches Zentrum Immuntherapie, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
- Correspondence: (S.L.); (M.J.W.); Tel.: +49-9131-8535894 (S.L.); +49-9131-8535000 (M.J.W.)
| | - Oana-Maria Thoma
- Department of Internal Medicine 1, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (O.-M.T.); (L.K.); (M.F.N.)
- Deutsches Zentrum Immuntherapie, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
| | - Lucas Kreiss
- Department of Internal Medicine 1, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (O.-M.T.); (L.K.); (M.F.N.)
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (O.F.); (S.S.)
| | - Simon Völkl
- Department of Internal Medicine 5, Haematology and Oncology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany;
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (O.F.); (S.S.)
- Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany
| | - Markus F. Neurath
- Department of Internal Medicine 1, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (O.-M.T.); (L.K.); (M.F.N.)
- Deutsches Zentrum Immuntherapie, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (O.F.); (S.S.)
- Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany
| | - Maximilian J. Waldner
- Department of Internal Medicine 1, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany; (O.-M.T.); (L.K.); (M.F.N.)
- Deutsches Zentrum Immuntherapie, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91052 Erlangen, Germany
- Correspondence: (S.L.); (M.J.W.); Tel.: +49-9131-8535894 (S.L.); +49-9131-8535000 (M.J.W.)
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Ganzleben I, Kreiß L, Mühlberg A, Friedrich O, Neurath MF, Schürmann S, Waldner M. Label-free analysis of experimental lung fibrosis using multiphoton microscopy and Raman spectroscopy. Imaging 2021. [DOI: 10.1183/13993003.congress-2021.pa348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Bojarski C, Waldner M, Rath T, Schürmann S, Neurath MF, Atreya R, Siegmund B. Innovative Diagnostic Endoscopy in Inflammatory Bowel Diseases: From High-Definition to Molecular Endoscopy. Front Med (Lausanne) 2021; 8:655404. [PMID: 34368180 PMCID: PMC8333704 DOI: 10.3389/fmed.2021.655404] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 06/22/2021] [Indexed: 12/30/2022] Open
Abstract
High-definition endoscopy is one essential step in the initial diagnosis of inflammatory bowel disease (IBD) characterizing the extent and severity of inflammation, as well as discriminating ulcerative colitis (UC) from Crohn's disease (CD). Following general recommendations and national guidelines, individual risk stratification should define the appropriate surveillance strategy, biopsy protocol and frequency of endoscopies. Beside high-definition videoendoscopy the application of dyes applied via a spraying catheter is of additional diagnostic value with a higher detection rate of intraepithelial neoplasia (IEN). Virtual chromoendoscopy techniques (NBI, FICE, I-scan, BLI) should not be recommended as a single surveillance strategy in IBD, although newer data suggest a higher comparability to dye-based chromoendoscopy than previously assumed. First results of oral methylene blue formulation are promising for improving the acceptance rate of classical chromoendoscopy. Confocal laser endomicroscopy (CLE) is still an experimental but highly innovative endoscopic procedure with the potential to contribute to the detection of dysplastic lesions. Molecular endoscopy in IBD has taken application of CLE to a higher level and allows topical application of labeled probes, mainly antibodies, against specific target structures expressed in the tissue to predict response or failure to biological therapies. First pre-clinical and in vivo data from label-free multiphoton microscopy (MPM) are now available to characterize mucosal and submucosal inflammation on endoscopy in more detail. These new techniques now have opened the door to individualized and highly specific molecular imaging in IBD in the future and pave the path to personalized medicine approaches. The quality of evidence was stated according to the Oxford Center of evidence-based medicine (March 2009). For this review a Medline search up to January 2021 was performed using the words “inflammatory bowel disease,” “ulcerative colitis,” “crohn's disease,” “chromoendoscopy,” “high-definition endoscopy,” “confocal laser endomicroscopy,” “confocal laser microscopy,” “molecular imaging,” “multiphoton microscopy.”
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Affiliation(s)
- Christian Bojarski
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department for Medicine (Gastroenterology, Infectious diseases, Rheumatology), Berlin, Germany
| | - Maximilian Waldner
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Timo Rath
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Sebastian Schürmann
- Department of Chemical and Biological Engineering, Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Markus F Neurath
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.,Deutsches Zentrum Immuntherapie DZI, Erlangen, Germany
| | - Raja Atreya
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.,Deutsches Zentrum Immuntherapie DZI, Erlangen, Germany
| | - Britta Siegmund
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department for Medicine (Gastroenterology, Infectious diseases, Rheumatology), Berlin, Germany
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11
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Schneidereit D, Bröllochs A, Ritter P, Kreiß L, Mokhtari Z, Beilhack A, Krönke G, Ackermann JA, Faas M, Grüneboom A, Schürmann S, Friedrich O. An advanced optical clearing protocol allows label-free detection of tissue necrosis via multiphoton microscopy in injured whole muscle. Am J Cancer Res 2021; 11:2876-2891. [PMID: 33456578 PMCID: PMC7806485 DOI: 10.7150/thno.51558] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 12/12/2020] [Indexed: 01/27/2023] Open
Abstract
Rationale: Structural remodeling or damage as a result of disease or injury is often not evenly distributed throughout a tissue but strongly depends on localization and extent of damaging stimuli. Skeletal muscle as a mechanically active organ can express signs of local or even systemic myopathic damage, necrosis, or repair. Conventionally, muscle biopsies (patients) or whole muscles (animal models) are mechanically sliced and stained to assess structural alterations histologically. Three-dimensional tissue information can be obtained by applying deep imaging modalities, e.g. multiphoton or light-sheet microscopy. Chemical clearing approaches reduce scattering, e.g. through matching refractive tissue indices, to overcome optical penetration depth limits in thick tissues. Methods: Here, we optimized a range of different clearing protocols. We find aqueous solution-based protocols employing (20-80%) 2,2'-thiodiethanol (TDE) to be advantageous over organic solvents (dibenzyl ether, cinnamate) regarding the preservation of muscle morphology, ease-of-use, hazard level, and costs. Results: Applying TDE clearing to a mouse model of local cardiotoxin (CTX)-induced muscle necrosis, a complete loss of myosin-II signals was observed in necrotic areas with little change in fibrous collagen or autofluorescence (AF) signals. The 3D aspect of myofiber integrity could be assessed, and muscle necrosis in whole muscle was quantified locally via the ratios of detected AF, forward- and backward-scattered Second Harmonic Generation (fSHG, bSHG) signals. Conclusion: TDE optical clearing is a versatile tool to study muscle architecture in conjunction with label-free multiphoton imaging in 3D in injury/myopathy models and might also be useful in studying larger biofabricated constructs in regenerative medicine.
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12
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Kreiß L, Thoma OM, Dilipkumar A, Carlé B, Longequeue P, Kunert T, Rath T, Hildner K, Neufert C, Vieth M, Neurath MF, Friedrich O, Schürmann S, Waldner MJ. Label-Free In Vivo Histopathology of Experimental Colitis via 3-Channel Multiphoton Endomicroscopy. Gastroenterology 2020; 159:832-834. [PMID: 32544392 DOI: 10.1053/j.gastro.2020.05.081] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 05/07/2020] [Accepted: 05/08/2020] [Indexed: 12/17/2022]
Affiliation(s)
- Lucas Kreiß
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany; Erlangen Graduate School in Advanced Optical Technologies
| | - Oana-Maria Thoma
- Erlangen Graduate School in Advanced Optical Technologies; Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Ashwathama Dilipkumar
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany; Erlangen Graduate School in Advanced Optical Technologies
| | - Birgitta Carlé
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Pascal Longequeue
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Timo Kunert
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Timo Rath
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Kai Hildner
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Clemens Neufert
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Michael Vieth
- Institute of Pathology, Klinikum Bayreuth, Bayreuth, Germany
| | - Markus F Neurath
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany; Deutsches Zentrum Immuntherapie DZI, Erlangen, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany; Erlangen Graduate School in Advanced Optical Technologies
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany; Erlangen Graduate School in Advanced Optical Technologies
| | - Maximilian J Waldner
- Erlangen Graduate School in Advanced Optical Technologies; Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany; Deutsches Zentrum Immuntherapie DZI, Erlangen, Germany.
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López-Posadas R, Fastancz P, Martínez-Sánchez LDC, Panteleev-Ivlev J, Thonn V, Kisseleva T, Becker LS, Schulz-Kuhnt A, Zundler S, Wirtz S, Atreya R, Carlé B, Friedrich O, Schürmann S, Waldner MJ, Neufert C, Brakebusch CH, Bergö MO, Neurath MF, Atreya I. Inhibiting PGGT1B Disrupts Function of RHOA, Resulting in T-cell Expression of Integrin α4β7 and Development of Colitis in Mice. Gastroenterology 2019; 157:1293-1309. [PMID: 31302143 DOI: 10.1053/j.gastro.2019.07.007] [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] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 07/01/2019] [Accepted: 07/07/2019] [Indexed: 01/07/2023]
Abstract
BACKGROUND & AIMS It is not clear how regulation of T-cell function is altered during development of inflammatory bowel diseases (IBD). We studied the mechanisms by which geranylgeranyltransferase-mediated prenylation controls T-cell localization to the intestine and chronic inflammation. METHODS We generated mice with T-cell-specific disruption of the geranylgeranyltransferase type I, beta subunit gene (Pggt1b), called Pggt1bΔCD4 mice, or the ras homolog family member A gene (Rhoa), called RhoaΔCD4 mice. We also studied mice with knockout of CDC42 or RAC1 and wild-type mice (controls). Intestinal tissues were analyzed by histology, multiphoton and confocal microscopy, and real-time polymerase chain reaction. Activation of CDC42, RAC1, and RHOA were measured with G-LISA, cell fractionation, and immunoblots. T cells and lamina propria mononuclear cells from mice were analyzed by flow cytometry or transferred to Rag1-/- mice. Mice were given injections of antibodies against integrin alpha4beta7 or gavaged with the RORC antagonist GSK805. We obtained peripheral blood and intestinal tissue samples from patients with and without IBD and analyzed them by flow cytometry. RESULTS Pggt1bΔCD4 mice developed spontaneous colitis, characterized by thickening of the intestinal wall, edema, fibrosis, accumulation of T cells in the colon, and increased expression of inflammatory cytokines. Compared with control CD4+ T cells, PGGT1B-deficient CD4+ T cells expressed significantly higher levels of integrin alpha4beta7, which regulates their localization to the intestine. Inflammation induced by transfer of PGGT1B-deficient CD4+ T cells to Rag1-/- mice was blocked by injection of an antibody against integrin alpha4beta7. Lamina propria of Pggt1bΔCD4 mice had increased numbers of CD4+ T cells that expressed RORC and higher levels of cytokines produced by T-helper 17 cells (granulocyte-macrophage colony-stimulating factor, interleukin [IL]17A, IL17F, IL22, and tumor necrosis factor [TNF]). The RORC inverse agonist GSK805, but not antibodies against IL17A or IL17F, prevented colitis in Pggt1bΔCD4 mice. PGGT1B-deficient CD4+ T cells had decreased activation of RHOA. RhoAΔCD4 mice had a similar phenotype to Pggt1bΔCD4 mice, including development of colitis, increased numbers of CD4+ T cells in colon, increased expression of integrin alpha4beta7 by CD4+ T cells, and increased levels of IL17A and other inflammatory cytokines in lamina propria. T cells isolated from intestinal tissues from patients with IBD had significantly lower levels of PGGT1B than tissues from individuals without IBD. CONCLUSION Loss of PGGT1B from T cells in mice impairs RHOA function, increasing CD4+ T-cell expression of integrin alpha4beta7 and localization to colon, resulting in increased expression of inflammatory cytokines and colitis. T cells isolated from gut tissues from patients with IBD have lower levels of PGGT1B than tissues from patients without IBD.
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Affiliation(s)
- Rocío López-Posadas
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany.
| | - Petra Fastancz
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | | | - Julia Panteleev-Ivlev
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Veronika Thonn
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Tatyana Kisseleva
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Lukas S Becker
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Anja Schulz-Kuhnt
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Sebastian Zundler
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Stefan Wirtz
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Raja Atreya
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Birgitta Carlé
- Department of Chemical and Biological Engineering, Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Oliver Friedrich
- Department of Chemical and Biological Engineering, Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Sebastian Schürmann
- Department of Chemical and Biological Engineering, Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Maximilian J Waldner
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Clemens Neufert
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Cord H Brakebusch
- Biotec Research and Innovation Center, University of Copenhagen, Copenhagen, Denmark
| | - Martin O Bergö
- Sahlgrenska Cancer Center, University of Gothenburg, Gothenburg, Sweden
| | - Markus F Neurath
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Imke Atreya
- Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
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Dilipkumar A, Al‐Shemmary A, Kreiß L, Cvecek K, Carlé B, Knieling F, Gonzales Menezes J, Thoma O, Schmidt M, Neurath MF, Waldner M, Friedrich O, Schürmann S. Label-Free Multiphoton Endomicroscopy for Minimally Invasive In Vivo Imaging. Adv Sci (Weinh) 2019; 6:1801735. [PMID: 31016109 PMCID: PMC6468963 DOI: 10.1002/advs.201801735] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 01/29/2019] [Indexed: 05/24/2023]
Abstract
Multiphoton microscopy of cellular autofluorescence and second harmonic generation from collagen facilitates imaging of living cells and tissues without the need for additional fluorescent labels. Here, a compact multiphoton endomicroscope for label-free in vivo imaging in small animals via side-viewing needle objectives is presented. Minimal invasive imaging at cellular resolution is performed in colonoscopy of mice without surgical measures and without fluorescent dyes as a contrast agent. The colon mucosa is imaged repeatedly in the same animal in a mouse model of acute intestinal inflammation to study the process of inflammation at the tissue level within a time period of ten days, demonstrating the capabilities of label-free endomicroscopy for longitudinal studies for the first time.
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Affiliation(s)
- Ashwathama Dilipkumar
- Institute of Medical BiotechnologyFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 391052ErlangenGermany
- Erlangen Graduate School in Advanced Optical TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 791052ErlangenGermany
| | - Alaa Al‐Shemmary
- Institute of Medical BiotechnologyFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 391052ErlangenGermany
- Erlangen Graduate School in Advanced Optical TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 791052ErlangenGermany
| | - Lucas Kreiß
- Institute of Medical BiotechnologyFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 391052ErlangenGermany
- Erlangen Graduate School in Advanced Optical TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 791052ErlangenGermany
| | - Kristian Cvecek
- Erlangen Graduate School in Advanced Optical TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 791052ErlangenGermany
- Institute of Photonic TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Konrad‐Zuse‐Str. 3–591052ErlangenGermany
| | - Birgitta Carlé
- Institute of Medical BiotechnologyFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 391052ErlangenGermany
- Erlangen Graduate School in Advanced Optical TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 791052ErlangenGermany
| | - Ferdinand Knieling
- Department of Internal Medicine 1University Hospital ErlangenUlmenweg 1891054ErlangenGermany
- Department of Pediatrics and Adolescent MedicineUniversity Hospital ErlangenLoschgestr. 1591054ErlangenGermany
| | - Jean Gonzales Menezes
- Department of Internal Medicine 1University Hospital ErlangenUlmenweg 1891054ErlangenGermany
| | - Oana‐Maria Thoma
- Erlangen Graduate School in Advanced Optical TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 791052ErlangenGermany
- Department of Internal Medicine 1University Hospital ErlangenUlmenweg 1891054ErlangenGermany
| | - Michael Schmidt
- Erlangen Graduate School in Advanced Optical TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 791052ErlangenGermany
- Institute of Photonic TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Konrad‐Zuse‐Str. 3–591052ErlangenGermany
| | - Markus F. Neurath
- Erlangen Graduate School in Advanced Optical TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 791052ErlangenGermany
- Department of Internal Medicine 1University Hospital ErlangenUlmenweg 1891054ErlangenGermany
| | - Maximilian Waldner
- Erlangen Graduate School in Advanced Optical TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 791052ErlangenGermany
- Department of Internal Medicine 1University Hospital ErlangenUlmenweg 1891054ErlangenGermany
| | - Oliver Friedrich
- Institute of Medical BiotechnologyFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 391052ErlangenGermany
- Erlangen Graduate School in Advanced Optical TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 791052ErlangenGermany
| | - Sebastian Schürmann
- Institute of Medical BiotechnologyFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 391052ErlangenGermany
- Erlangen Graduate School in Advanced Optical TechnologiesFriedrich‐Alexander‐Universität Erlangen‐Nürnberg (FAU)Paul‐Gordan‐Str. 791052ErlangenGermany
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15
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Friedrich O, Merten AL, Schneidereit D, Guo Y, Schürmann S, Martinac B. Stretch in Focus: 2D Inplane Cell Stretch Systems for Studies of Cardiac Mechano-Signaling. Front Bioeng Biotechnol 2019; 7:55. [PMID: 30972334 PMCID: PMC6445849 DOI: 10.3389/fbioe.2019.00055] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [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: 01/18/2019] [Accepted: 03/04/2019] [Indexed: 12/20/2022] Open
Abstract
Mechanobiology is a rapidly growing interdisciplinary research field, involving biophysics, molecular and cell biology, biomedical engineering, and medicine. Rapid progress has been possible due to emerging devices and tools engineered for studies of the effect of mechanical forces, such as stretch or shear force, impacting on biological cells and tissues. In response to such mechanical stimuli, cells possess various mechanosensors among which mechanosensitive ion channels are molecular transducers designed to convert mechanical stimuli into electrical and/or biochemical intracellular signals on millisecond time scales. To study their role in cellular signaling pathways, devices have been engineered that enable application of different strain protocols to cells allowing for determination of the stress-strain relationship or other, preferably optical, readouts. Frequently, these devices are mounted on fluorescence microscopes, allowing simultaneous investigation of cellular mechanotransduction processes combined with live-cell imaging. Mechanical stress in organs/tissues can be complex and multiaxial, e.g., in hollow organs, like lung alveoli, bladder, or the heart. Therefore, biomedical engineers have, in recent years, developed devices based on elastomeric membranes for application of biaxial or multiaxial stretch to 2D substrate-adhered or even 3D-embedded cells. Here, we review application of stretch technologies to cellular mechanotransduction with a focus on cardiovascular systems. We also present new results obtained by our IsoStretcher device to examine mechanosensitivity of adult ventricular cardiomyocytes. We show that sudden isotropic stretch of cardiomyocytes can already trigger arrhythmic Ca2+ transients on the single cell level.
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Affiliation(s)
- Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.,Mechanosensory Biophysics Laboratory, Victor Chang Cardiac Research Institute, Darlinghurst, NSW, Australia.,Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.,Muscle Research Center Erlangen, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Anna-Lena Merten
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.,Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.,Muscle Research Center Erlangen, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Dominik Schneidereit
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.,Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.,Muscle Research Center Erlangen, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - Yang Guo
- Mechanosensory Biophysics Laboratory, Victor Chang Cardiac Research Institute, Darlinghurst, NSW, Australia.,Faculty of Medicine, St Vincent's Clinical School, University of New South Wales, Darlinghurst, NSW, Australia
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.,Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Boris Martinac
- Mechanosensory Biophysics Laboratory, Victor Chang Cardiac Research Institute, Darlinghurst, NSW, Australia.,Faculty of Medicine, St Vincent's Clinical School, University of New South Wales, Darlinghurst, NSW, Australia
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16
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Scheibe K, Kersten C, Schmied A, Vieth M, Primbs T, Carlé B, Knieling F, Claussen J, Klimowicz AC, Zheng J, Baum P, Meyer S, Schürmann S, Friedrich O, Waldner MJ, Rath T, Wirtz S, Kollias G, Ekici AB, Atreya R, Raymond EL, Mbow ML, Neurath MF, Neufert C. Inhibiting Interleukin 36 Receptor Signaling Reduces Fibrosis in Mice With Chronic Intestinal Inflammation. Gastroenterology 2019; 156:1082-1097.e11. [PMID: 30452921 DOI: 10.1053/j.gastro.2018.11.029] [Citation(s) in RCA: 130] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 11/08/2018] [Accepted: 11/09/2018] [Indexed: 12/18/2022]
Abstract
BACKGROUND & AIMS Intestinal fibrosis is a long-term complication in inflammatory bowel diseases (IBD) that frequently results in functional damage, bowel obstruction, and surgery. Interleukin (IL) 36 is a group of cytokines in the IL1 family with inflammatory effects. We studied the expression of IL36 and its receptor, interleukin 1 receptor like 2 (IL1RL2 or IL36R) in the development of intestinal fibrosis in human tissues and mice. METHODS We obtained intestinal tissues from 92 patients with Crohn's disease (CD), 48 patients with ulcerative colitis, and 26 patients without inflammatory bowel diseases (control individuals). Tissues were analyzed by histology to detect fibrosis and by immunohistochemistry to determine the distribution of fibroblasts and levels of IL36R ligands. Human and mouse fibroblasts were incubated with IL36 or control medium, and transcriptome-wide RNA sequences were analyzed. Mice were given neutralizing antibodies against IL36R, and we studied intestinal tissues from Il1rl2-/- mice; colitis and fibrosis were induced in mice by repetitive administration of DSS or TNBS. Bone marrow cells were transplanted from Il1rl2-/- to irradiated wild-type mice and intestinal tissues were analyzed. Antibodies against IL36R were applied to mice with established chronic colitis and fibrosis and intestinal tissues were studied. RESULTS Mucosal and submucosal tissue from patients with CD or ulcerative colitis had higher levels of collagens, including type VI collagen, compared with tissue from control individuals. In tissues from patients with fibrostenotic CD, significantly higher levels of IL36A were noted, which correlated with high numbers of activated fibroblasts that expressed α-smooth muscle actin. IL36R activation of mouse and human fibroblasts resulted in expression of genes that regulate fibrosis and tissue remodeling, as well as expression of collagen type VI. Il1rl2-/- mice and mice given injections of an antibody against IL36R developed less severe colitis and fibrosis after administration of DSS or TNBS, but bone marrow cells from Il1rl2-/- mice did not prevent induction of colitis and fibrosis. Injection of antibodies against IL36R significantly reduced established fibrosis in mice with chronic intestinal inflammation. CONCLUSION We found higher levels of IL36A in fibrotic intestinal tissues from patients with IBD compared with control individuals. IL36 induced expression of genes that regulate fibrogenesis in fibroblasts. Inhibition or knockout of the IL36R gene in mice reduces chronic colitis and intestinal fibrosis. Agents designed to block IL36R signaling could be developed for prevention and treatment of intestinal fibrosis in patients with IBD.
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Affiliation(s)
- Kristina Scheibe
- First Department of Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christina Kersten
- First Department of Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Anabel Schmied
- First Department of Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Michael Vieth
- Institute of Pathology, Klinikum Bayreuth, Bayreuth, Germany
| | - Tatjana Primbs
- First Department of Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Birgitta Carlé
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Ferdinand Knieling
- First Department of Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany; Department of Pediatrics and Adolescent Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | | | | | - Jie Zheng
- Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Connecticut
| | - Patrick Baum
- Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Connecticut
| | - Sebastian Meyer
- Institute of Medical Informatics, Biometry, and Epidemiology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Maximilian J Waldner
- First Department of Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Timo Rath
- First Department of Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Stefan Wirtz
- First Department of Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - George Kollias
- Biomedical Sciences Research Center Alexander Fleming, Vari, Greece
| | - Arif B Ekici
- Institute of Human Genetics, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Raja Atreya
- First Department of Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Ernest L Raymond
- Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Connecticut
| | - M Lamine Mbow
- Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Connecticut
| | - Markus F Neurath
- First Department of Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
| | - Clemens Neufert
- First Department of Medicine, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
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17
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Schneidereit D, Schürmann S, Friedrich O. PiezoGRIN: A High-Pressure Chamber Incorporating GRIN Lenses for High-Resolution 3D-Microscopy of living Cells and Tissues. Adv Sci (Weinh) 2019; 6:1801453. [PMID: 30828527 PMCID: PMC6382305 DOI: 10.1002/advs.201801453] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 10/15/2018] [Indexed: 05/30/2023]
Abstract
A high-pressure optical chamber, PiezoGRIN, that facilitates label-free 3D high-resolution live-cell multiphoton microscopy in thick tissue samples is presented. A set of two Gradient Index (GRIN) rod lenses is integrated into the chamber as an optical guide and allows for the adjustment of the focal plane through the sample providing a field of view volume of 450 × 450 × 500 µm (x, y, z). An optical lateral resolution of 0.8 µm is achieved by using two-photon excitation with 150 fs pulses of a 810 nm titanium-sapphire laser at hydrostatic pressures up to 200 MPa. With the PiezoGRIN setup, it is possible to follow pressure-induced changes in subcellular structure of unstained vital mouse skeletal muscle tissue up to 200 µm below the tissue surface.
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Affiliation(s)
- Dominik Schneidereit
- Institute of Medical BiotechnologyFriedrich‐Alexander University Erlangen‐NürnbergPaul‐Gordan Strasse 3Erlangen91052Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT)Friedrich‐Alexander‐University Erlangen‐NürnbergErlangen91052Germany
| | - Sebastian Schürmann
- Institute of Medical BiotechnologyFriedrich‐Alexander University Erlangen‐NürnbergPaul‐Gordan Strasse 3Erlangen91052Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT)Friedrich‐Alexander‐University Erlangen‐NürnbergErlangen91052Germany
| | - Oliver Friedrich
- Institute of Medical BiotechnologyFriedrich‐Alexander University Erlangen‐NürnbergPaul‐Gordan Strasse 3Erlangen91052Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT)Friedrich‐Alexander‐University Erlangen‐NürnbergErlangen91052Germany
- Muscle Research Center Erlangen (MURCE)Paul‐Gordan Strasse 3Erlangen91052Germany
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18
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Knieling F, Gonzales Menezes J, Claussen J, Schwarz M, Neufert C, Fahlbusch FB, Rath T, Thoma OM, Kramer V, Menchicchi B, Kersten C, Scheibe K, Schürmann S, Carlé B, Rascher W, Neurath MF, Ntziachristos V, Waldner MJ. Raster-Scanning Optoacoustic Mesoscopy for Gastrointestinal Imaging at High Resolution. Gastroenterology 2018; 154:807-809.e3. [PMID: 29309775 DOI: 10.1053/j.gastro.2017.11.285] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Revised: 11/27/2017] [Accepted: 11/28/2017] [Indexed: 01/08/2023]
Affiliation(s)
- Ferdinand Knieling
- Department of Pediatrics and Adolescent Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany; Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
| | - Jean Gonzales Menezes
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
| | | | | | - Clemens Neufert
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
| | - Fabian B Fahlbusch
- Department of Pediatrics and Adolescent Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
| | - Timo Rath
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany; Ludwig Demling Center of Excellence, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nürnberg, Germany
| | - Oana-Maria Thoma
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany; Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Nürnberg, Germany
| | - Viktoria Kramer
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
| | - Bianca Menchicchi
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
| | - Christina Kersten
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
| | - Kristina Scheibe
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nürnberg, Germany
| | - Birgitta Carlé
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nürnberg, Germany
| | - Wolfgang Rascher
- Department of Pediatrics and Adolescent Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
| | - Markus F Neurath
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany; Ludwig Demling Center of Excellence, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nürnberg, Germany
| | - Vasilis Ntziachristos
- Institute for Biological and Medical Imaging, Helmholtz Zentrum München, München, Germany; Chair for Biological Imaging, TranslaTUM, Technische Universität München, München, Germany
| | - Maximilian J Waldner
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany; Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Nürnberg, Germany.
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19
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Schneidereit D, Nübler S, Prölß G, Reischl B, Schürmann S, Müller OJ, Friedrich O. Optical prediction of single muscle fiber force production using a combined biomechatronics and second harmonic generation imaging approach. Light Sci Appl 2018; 7:79. [PMID: 30374401 PMCID: PMC6199289 DOI: 10.1038/s41377-018-0080-3] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 09/19/2018] [Accepted: 09/24/2018] [Indexed: 05/22/2023]
Abstract
Skeletal muscle is an archetypal organ whose structure is tuned to match function. The magnitude of order in muscle fibers and myofibrils containing motor protein polymers determines the directed force output of the summed force vectors and, therefore, the muscle's power performance on the structural level. Structure and function can change dramatically during disease states involving chronic remodeling. Cellular remodeling of the cytoarchitecture has been pursued using noninvasive and label-free multiphoton second harmonic generation (SHG) microscopy. Hereby, structure parameters can be extracted as a measure of myofibrillar order and thus are suggestive of the force output that a remodeled structure can still achieve. However, to date, the parameters have only been an indirect measure, and a precise calibration of optical SHG assessment for an exerted force has been elusive as no technology in existence correlates these factors. We engineered a novel, automated, high-precision biomechatronics system into a multiphoton microscope allows simultaneous isometric Ca2+-graded force or passive viscoelasticity measurements and SHG recordings. Using this MechaMorph system, we studied force and SHG in single EDL muscle fibers from wt and mdx mice; the latter serves as a model for compromised force and abnormal myofibrillar structure. We present Ca2+-graded isometric force, pCa-force curves, passive viscoelastic parameters and 3D structure in the same fiber for the first time. Furthermore, we provide a direct calibration of isometric force to morphology, which allows noninvasive prediction of the force output of single fibers from only multiphoton images, suggesting a potential application in the diagnosis of myopathies.
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Affiliation(s)
- Dominik Schneidereit
- Institute of Medical Biotechnology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg, Paul-Gordan-Str. 3, 91052 Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), FAU Erlangen-Nürnberg, Paul-Gordan-Str. 7, 91052 Erlangen, Germany
| | - Stefanie Nübler
- Institute of Medical Biotechnology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg, Paul-Gordan-Str. 3, 91052 Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), FAU Erlangen-Nürnberg, Paul-Gordan-Str. 7, 91052 Erlangen, Germany
| | - Gerhard Prölß
- Institute of Medical Biotechnology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg, Paul-Gordan-Str. 3, 91052 Erlangen, Germany
| | - Barbara Reischl
- Institute of Medical Biotechnology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg, Paul-Gordan-Str. 3, 91052 Erlangen, Germany
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg, Paul-Gordan-Str. 3, 91052 Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), FAU Erlangen-Nürnberg, Paul-Gordan-Str. 7, 91052 Erlangen, Germany
- Muscle Research Center Erlangen (MURCE), Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Oliver J Müller
- Department of Internal Medicine III, University of Kiel, Arnold-Heller-Str. 3, 24105 Kiel, Germany
- DZHK (German Center for Cardiovascular Research) Partner Site Hamburg/Kiel/Lübeck, Kiel, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg, Paul-Gordan-Str. 3, 91052 Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), FAU Erlangen-Nürnberg, Paul-Gordan-Str. 7, 91052 Erlangen, Germany
- Muscle Research Center Erlangen (MURCE), Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
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20
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Waldner MJ, Rath T, Schürmann S, Bojarski C, Atreya R. Imaging of Mucosal Inflammation: Current Technological Developments, Clinical Implications, and Future Perspectives. Front Immunol 2017; 8:1256. [PMID: 29075256 PMCID: PMC5641553 DOI: 10.3389/fimmu.2017.01256] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Accepted: 09/21/2017] [Indexed: 12/12/2022] Open
Abstract
In recent years, various technological developments markedly improved imaging of mucosal inflammation in patients with inflammatory bowel diseases. Although technological developments such as high-definition-, chromo-, and autofluorescence-endoscopy led to a more precise and detailed assessment of mucosal inflammation during wide-field endoscopy, probe-based and stationary confocal laser microscopy enabled in vivo real-time microscopic imaging of mucosal surfaces within the gastrointestinal tract. Through the use of fluorochromes with specificity against a defined molecular target combined with endoscopic techniques that allow ultrastructural resolution, molecular imaging enables in vivo visualization of single molecules or receptors during endoscopy. Molecular imaging has therefore greatly expanded the clinical utility and applications of modern innovative endoscopy, which include the diagnosis, surveillance, and treatment of disease as well as the prediction of the therapeutic response of individual patients. Furthermore, non-invasive imaging techniques such as computed tomography, magnetic resonance imaging, scintigraphy, and ultrasound provide helpful information as supplement to invasive endoscopic procedures. In this review, we provide an overview on the current status of advanced imaging technologies for the clinical non-invasive and endoscopic evaluation of mucosal inflammation. Furthermore, the value of novel methods such as multiphoton microscopy, optoacoustics, and optical coherence tomography and their possible future implementation into clinical diagnosis and evaluation of mucosal inflammation will be discussed.
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Affiliation(s)
- Maximilian J Waldner
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Timo Rath
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christian Bojarski
- Department of Gastroenterology, Infectiology and Rheumatology, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Raja Atreya
- Department of Medicine 1, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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21
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Diermeier S, Buttgereit A, Schürmann S, Winter L, Xu H, Murphy RM, Clemen CS, Schröder R, Friedrich O. Preaged remodeling of myofibrillar cytoarchitecture in skeletal muscle expressing R349P mutant desmin. Neurobiol Aging 2017; 58:77-87. [PMID: 28715662 DOI: 10.1016/j.neurobiolaging.2017.06.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 04/04/2017] [Revised: 06/02/2017] [Accepted: 06/06/2017] [Indexed: 12/14/2022]
Abstract
The majority of hereditary and acquired myopathies are clinically characterized by progressive muscle weakness. We hypothesized that ongoing derangement of skeletal muscle cytoarchitecture at the single fiber level may precede and be responsible for the progressive muscle weakness. Here, we analyzed the effects of aging in wild-type (wt) and heterozygous (het) and homozygous (hom) R349P desmin knock-in mice. The latter harbor the ortholog of the most frequently encountered human R350P desmin missense mutation. We quantitatively analyzed the subcellular cytoarchitecture of fast- and slow-twitch muscles from young, intermediate, and aged wt as well as desminopathy mice. We recorded multiphoton second harmonic generation and nuclear fluorescence signals in single muscle fibers to compare aging-related effects in all genotypes. The analysis of wt mice revealed that the myofibrillar cytoarchitecture remained stable with aging in fast-twitch muscles, whereas slow-twitch muscle fibers displayed structural derangements during aging. In contrast, the myofibrillar cytoarchitecture and nuclear density were severely compromised in fast- and slow-twitch muscle fibers of hom R349P desmin mice at all ages. Het mice only showed a clear degradation in their fiber structure in fast-twitch muscles from the adult to the presenescent age bin. Our study documents distinct signs of normal and R349P mutant desmin-related remodeling of the 3D myofibrillar architecture during aging, which provides a structural basis for the progressive muscle weakness.
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Affiliation(s)
- Stefanie Diermeier
- Institute of Medical Biotechnology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany; SAOT, Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany; Muscle Research Center Erlangen (MURCE), Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Andreas Buttgereit
- Institute of Medical Biotechnology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany; Muscle Research Center Erlangen (MURCE), Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany; SAOT, Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany; Muscle Research Center Erlangen (MURCE), Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Lilli Winter
- Institute of Neuropathology, University Hospital Erlangen, Erlangen, Germany
| | - Hongyang Xu
- Department of Biochemistry and Genetics, La Trobe University, Melbourne, Australia
| | - Robyn M Murphy
- Department of Biochemistry and Genetics, La Trobe University, Melbourne, Australia
| | - Christoph S Clemen
- Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany; Department of Neurology, Heimer Institute for Muscle Research, University Hospital Bergmannsheil, Ruhr-University Bochum, Bochum, Germany
| | - Rolf Schröder
- Institute of Neuropathology, University Hospital Erlangen, Erlangen, Germany; Muscle Research Center Erlangen (MURCE), Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany; SAOT, Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany; Muscle Research Center Erlangen (MURCE), Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany.
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22
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Abstract
PURPOSE While the prevalence of children on vegetarian diets is assumed to be on the rise in industrialized countries, there are hardly any representative data available. In general, vegetarian diets are presumed to be healthy; nevertheless, there are concerns as to whether the dietary specifications required during infancy, childhood, and adolescence can be met. Therefore, the objective of this systematic review was to evaluate studies on the dietary intake and the nutritional or health status of vegetarian infants, children, and adolescents. METHODS The database MEDLINE was used for literature search. In addition, references of reviews and expert opinions were considered. Inclusion criteria were (1) sufficient dietary information to define vegetarian type diet and (2) characteristics of nutritional or health status. Case reports and studies from non-industrialized countries were excluded. RESULTS 24 publications from 16 studies published from 1988 to 2013 met our criteria. Study samples covered the age range from 0 to 18 years, and median sample size was 35. Five studies did not include a control group. With regard to biomarkers, anthropometry, and dietary or nutritional intake, the outcomes were diverse. Growth and body weight were generally found within the lower reference range. The intakes of folate, vitamin C, and dietary fiber were relatively high compared to reference values and/or control groups. Low status of vitamin B12 was reported in one study and low status of vitamin D in two studies. CONCLUSIONS Due to the study heterogeneity, the small samples, the bias towards upper social classes, and the scarcity of recent studies, the existing data do not allow us to draw firm conclusions on health benefits or risks of present-day vegetarian type diets on the nutritional or health status of children and adolescents in industrialized countries.
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Affiliation(s)
- S Schürmann
- Research Institute of Child Nutrition, Pediatric University Clinic Bochum, Alexandrinenstraße 5, 44791, Bochum, Germany
| | - M Kersting
- Research Institute of Child Nutrition, Pediatric University Clinic Bochum, Alexandrinenstraße 5, 44791, Bochum, Germany
| | - U Alexy
- IEL-Nutritional Epidemiology, DONALD Study, University of Bonn, Heinstück 11, 44225, Dortmund, Germany.
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23
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Rogan S, Taeymans J, Schürmann S, Woern L, Clarys P, Clijsen R. Segmentale Hautdurchblutungsreaktion während und nach Stimulation im Bereich der BWS. physioscience 2016. [DOI: 10.1055/s-0035-1567113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- S. Rogan
- Disziplin Physiotherapie, Fachbereich Gesundheit, Berner Fachhochschule, Bern, Schweiz
| | - J. Taeymans
- Disziplin Physiotherapie, Fachbereich Gesundheit, Berner Fachhochschule, Bern, Schweiz
| | - S. Schürmann
- Disziplin Physiotherapie, Fachbereich Gesundheit, Berner Fachhochschule, Bern, Schweiz
| | - L. Woern
- Disziplin Physiotherapie, Fachbereich Gesundheit, Berner Fachhochschule, Bern, Schweiz
| | - P. Clarys
- Labor für menschliche Biometrie und Biomechanik, Fakultät für Sport- und Rehabilitationswissenschaften, Freie Universität Brüssel, Brüssel, Belgien
| | - R. Clijsen
- Labor für menschliche Biometrie und Biomechanik, Fakultät für Sport- und Rehabilitationswissenschaften, Freie Universität Brüssel, Brüssel, Belgien
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24
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Chernavskaia O, Heuke S, Vieth M, Friedrich O, Schürmann S, Atreya R, Stallmach A, Neurath MF, Waldner M, Petersen I, Schmitt M, Bocklitz T, Popp J. Beyond endoscopic assessment in inflammatory bowel disease: real-time histology of disease activity by non-linear multimodal imaging. Sci Rep 2016; 6:29239. [PMID: 27406831 PMCID: PMC4942779 DOI: 10.1038/srep29239] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [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: 01/12/2016] [Accepted: 06/14/2016] [Indexed: 01/19/2023] Open
Abstract
Assessing disease activity is a prerequisite for an adequate treatment of inflammatory bowel diseases (IBD) such as Crohn’s disease and ulcerative colitis. In addition to endoscopic mucosal healing, histologic remission poses a promising end-point of IBD therapy. However, evaluating histological remission harbors the risk for complications due to the acquisition of biopsies and results in a delay of diagnosis because of tissue processing procedures. In this regard, non-linear multimodal imaging techniques might serve as an unparalleled technique that allows the real-time evaluation of microscopic IBD activity in the endoscopy unit. In this study, tissue sections were investigated using the non-linear multimodal microscopy combination of coherent anti-Stokes Raman scattering (CARS), two-photon excited auto fluorescence (TPEF) and second-harmonic generation (SHG). After the measurement a gold-standard assessment of histological indexes was carried out based on a conventional H&E stain. Subsequently, various geometry and intensity related features were extracted from the multimodal images. An optimized feature set was utilized to predict histological index levels based on a linear classifier. Based on the automated prediction, the diagnosis time interval is decreased. Therefore, non-linear multimodal imaging may provide a real-time diagnosis of IBD activity suited to assist clinical decision making within the endoscopy unit.
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Affiliation(s)
- Olga Chernavskaia
- Leibniz Institute of Photonic Technology, Jena, Germany.,Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University, Jena, Germany
| | - Sandro Heuke
- Leibniz Institute of Photonic Technology, Jena, Germany.,Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University, Jena, Germany
| | - Michael Vieth
- Institute of Pathology, Klinikum Bayreuth, Bayreuth, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany.,Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander University of Erlangen-Nuremberg
| | - Sebastian Schürmann
- Institute of Medical Biotechnology, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany.,Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander University of Erlangen-Nuremberg
| | - Raja Atreya
- Medical Department 1, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - Andreas Stallmach
- Department of Internal Medicine IV (Gastroenterology, Hepatology, and Infectious Diseases), Jena University Hospital, Jena, Germany
| | - Markus F Neurath
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander University of Erlangen-Nuremberg.,Medical Department 1, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - Maximilian Waldner
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander University of Erlangen-Nuremberg.,Medical Department 1, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - Iver Petersen
- Institute of Pathology, Jena University Hospital, Jena, Germany
| | - Michael Schmitt
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University, Jena, Germany
| | - Thomas Bocklitz
- Leibniz Institute of Photonic Technology, Jena, Germany.,Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University, Jena, Germany
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology, Jena, Germany.,Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University, Jena, Germany
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25
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Jakobs P, Schulz P, Ortmann C, Schürmann S, Exner S, Rebollido-Rios R, Dreier R, Seidler DG, Grobe K. Bridging the gap: heparan sulfate and Scube2 assemble Sonic hedgehog release complexes at the surface of producing cells. Sci Rep 2016; 6:26435. [PMID: 27199253 PMCID: PMC4873810 DOI: 10.1038/srep26435] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [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: 02/01/2016] [Accepted: 05/03/2016] [Indexed: 12/12/2022] Open
Abstract
Decision making in cellular ensembles requires the dynamic release of signaling molecules from the producing cells into the extracellular compartment. One important example of molecules that require regulated release in order to signal over several cell diameters is the Hedgehog (Hh) family, because all Hhs are synthesized as dual-lipidated proteins that firmly tether to the outer membrane leaflet of the cell that produces them. Factors for the release of the vertebrate Hh family member Sonic Hedgehog (Shh) include cell-surface sheddases that remove the lipidated terminal peptides, as well as the soluble glycoprotein Scube2 that cell-nonautonomously enhances this process. This raises the question of how soluble Scube2 is recruited to cell-bound Shh substrates to regulate their turnover. We hypothesized that heparan sulfate (HS) proteoglycans (HSPGs) on the producing cell surface may play this role. In this work, we confirm that HSPGs enrich Scube2 at the surface of Shh-producing cells and that Scube2-regulated proteolytic Shh processing and release depends on specific HS. This finding indicates that HSPGs act as cell-surface assembly and storage platforms for Shh substrates and for protein factors required for their release, making HSPGs critical decision makers for Scube2-dependent Shh signaling from the surface of producing cells.
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Affiliation(s)
- P Jakobs
- Institute for Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Waldeyerstr. 15, D-48149 Münster, Germany
| | - P Schulz
- Institute for Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Waldeyerstr. 15, D-48149 Münster, Germany
| | - C Ortmann
- Institute for Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Waldeyerstr. 15, D-48149 Münster, Germany
| | - S Schürmann
- Institute for Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Waldeyerstr. 15, D-48149 Münster, Germany
| | - S Exner
- Institute for Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Waldeyerstr. 15, D-48149 Münster, Germany
| | - R Rebollido-Rios
- Center for Medical Biotechnology#, University of Duisburg-Essen, 45117 Essen, Germany
| | - R Dreier
- Institute for Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Waldeyerstr. 15, D-48149 Münster, Germany
| | - D G Seidler
- Centre for Internal Medicine, Hannover Medical School I3, EB2/R3110, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - K Grobe
- Institute for Physiological Chemistry and Pathobiochemistry and Cells-in-Motion Cluster of Excellence (EXC1003-CiM), University of Münster, Waldeyerstr. 15, D-48149 Münster, Germany
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26
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Schürmann S, Wagner S, Herlitze S, Fischer C, Gumbrecht S, Wirth-Hücking A, Prölß G, Lautscham LA, Fabry B, Goldmann WH, Nikolova-Krstevski V, Martinac B, Friedrich O. The IsoStretcher: An isotropic cell stretch device to study mechanical biosensor pathways in living cells. Biosens Bioelectron 2016; 81:363-372. [PMID: 26991603 DOI: 10.1016/j.bios.2016.03.015] [Citation(s) in RCA: 32] [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] [Received: 10/13/2015] [Revised: 03/07/2016] [Accepted: 03/08/2016] [Indexed: 12/31/2022]
Abstract
Mechanosensation in many organs (e.g. lungs, heart, gut) is mediated by biosensors (like mechanosensitive ion channels), which convert mechanical stimuli into electrical and/or biochemical signals. To study those pathways, technical devices are needed that apply strain profiles to cells, and ideally allow simultaneous live-cell microscopy analysis. Strain profiles in organs can be complex and multiaxial, e.g. in hollow organs. Most devices in mechanobiology apply longitudinal uniaxial stretch to adhered cells using elastomeric membranes to study mechanical biosensors. Recent approaches in biomedical engineering have employed intelligent systems to apply biaxial or multiaxial stretch to cells. Here, we present an isotropic cell stretch system (IsoStretcher) that overcomes some previous limitations. Our system uses a rotational swivel mechanism that translates into a radial displacement of hooks attached to small circular silicone membranes. Isotropicity and focus stability are demonstrated with fluorescent beads, and transmission efficiency of elastomer membrane stretch to cellular area change in HeLa/HEK cells. Applying our system to lamin-A overexpressing fibrosarcoma cells, we found a markedly reduced stretch of cell area, indicative of a stiffer cytoskeleton. We also investigated stretch-activated Ca(2+) entry into atrial HL-1 myocytes. 10% isotropic stretch induced robust oscillating increases in intracellular Fluo-4 Ca(2+) fluorescence. Store-operated Ca(2+) entry was not detected in these cells. The Isostretcher provides a useful versatile tool for mechanobiology.
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Affiliation(s)
- S Schürmann
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Paul-Gordan-Str.3, 91052 Erlangen, Germany
| | - S Wagner
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Paul-Gordan-Str.3, 91052 Erlangen, Germany; Department of Physics, Biophysics Group, FAU, Henkestr. 91, 91052 Erlangen, Germany
| | - S Herlitze
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Paul-Gordan-Str.3, 91052 Erlangen, Germany
| | - C Fischer
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Paul-Gordan-Str.3, 91052 Erlangen, Germany
| | - S Gumbrecht
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Paul-Gordan-Str.3, 91052 Erlangen, Germany
| | - A Wirth-Hücking
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Paul-Gordan-Str.3, 91052 Erlangen, Germany
| | - G Prölß
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Paul-Gordan-Str.3, 91052 Erlangen, Germany
| | - L A Lautscham
- Department of Physics, Biophysics Group, FAU, Henkestr. 91, 91052 Erlangen, Germany
| | - B Fabry
- Department of Physics, Biophysics Group, FAU, Henkestr. 91, 91052 Erlangen, Germany
| | - W H Goldmann
- Department of Physics, Biophysics Group, FAU, Henkestr. 91, 91052 Erlangen, Germany
| | - V Nikolova-Krstevski
- Molecular Cardiology Division, Victor Chang Cardiac Research Institute, 405 Liverpool St, Darlinghurst, NSW 2010 Sydney, Australia
| | - B Martinac
- Mechanosensory Biophysics Laboratory, Victor Chang Cardiac Research Institute, Darlinghurst NSW 2010, Australia; St Vincent's Clinical School, University of New South Wales, Darlinghurst NSW 2010, Australia
| | - O Friedrich
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Paul-Gordan-Str.3, 91052 Erlangen, Germany.
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27
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Diermeier S, Haug M, Reischl B, Buttgereit A, Schürmann S, Spörrer M, Goldmann W, Fabry B, Elhimine F, Stehle R, Pfitzer G, Winter L, Clemen C, Schröder R, Friedrich O. DesR349P Mutation Results in Ultrastructural Disruptions and Compromise of Skeletal Muscle Biomechanics Already at Preclinical Stages in Young Mice before the Onset of Protein Aggregation. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.1629] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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28
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Wagner S, Schürmann S, Hein S, Schüttler J, Friedrich O. Septic cardiomyopathy in rat LPS-induced endotoxemia: relative contribution of cellular diastolic Ca(2+) removal pathways, myofibrillar biomechanics properties and action of the cardiotonic drug levosimendan. Basic Res Cardiol 2015; 110:507. [PMID: 26243667 DOI: 10.1007/s00395-015-0507-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 07/13/2015] [Accepted: 07/30/2015] [Indexed: 01/19/2023]
Abstract
Cardiac dysfunction is a common complication in sepsis and is characterized by forward pump failure. Hallmarks of septic cardiomyopathy are decreased myofibrillar contractility and reduced Ca(2+) sensitivity but it is still not clear whether reduced pump efficiency is predominantly a diastolic impairment. Moreover, a comprehensive picture of upstream Ca(2+) handling mechanisms and downstream myosin biomechanical parameters is still missing. Ca(2+)-sensitizing agents in sepsis may be promising but mechanistic insights for drugs like levosimendan are scarce. Here, we used an endotoxemic LPS rat model to study mechanisms of sepsis on in vivo hemodynamics, multicellular myofibrillar Ca(2+) sensitivity, in vitro cellular Ca(2+) homeostasis and subcellular actomyosin interaction with intracardiac catheters, force transducers, confocal Fluo-4 Ca(2+) recordings in paced cardiomyocytes, and in vitro motility assay, respectively. Left ventricular ejection fraction and myofibrillar Ca(2+) sensitivity were depressed in LPS animals but restored by levosimendan. Diastolic Ca(2+) transient kinetics was slowed down by LPS but ameliorated by levosimendan. Selectively blocking intracellular and sarcolemmal Ca(2+) extrusion pathways revealed minor contribution of sarcoplasmic reticulum Ca(2+) ATPase (SERCA) to Ca(2+) transient diastole in LPS-evoked sepsis but rather depressed Na(+)/Ca(2+) exchanger and plasmalemmal Ca(2+) ATPase. This was mostly compensated by levosimendan. Actin sliding velocities were depressed in myosin heart extracts from LPS rats. We conclude that endotoxemia specifically impairs sarcolemmal diastolic Ca(2+) extrusion pathways resulting in intracellular diastolic Ca(2+) overload. Levosimendan, apart from stabilizing Ca(2+)-troponin C complexes, potently improves cellular Ca(2+) extrusion in the septic heart.
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Affiliation(s)
- S Wagner
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nürnberg, Paul-Gordan-Str.3, 91052, Erlangen, Germany
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29
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Lang NR, Münster S, Metzner C, Krauss P, Schürmann S, Lange J, Aifantis KE, Friedrich O, Fabry B. Estimating the 3D pore size distribution of biopolymer networks from directionally biased data. Biophys J 2014; 105:1967-75. [PMID: 24209841 DOI: 10.1016/j.bpj.2013.09.038] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 08/05/2013] [Accepted: 09/17/2013] [Indexed: 10/26/2022] Open
Abstract
The pore size of biopolymer networks governs their mechanical properties and strongly impacts the behavior of embedded cells. Confocal reflection microscopy and second harmonic generation microscopy are widely used to image biopolymer networks; however, both techniques fail to resolve vertically oriented fibers. Here, we describe how such directionally biased data can be used to estimate the network pore size. We first determine the distribution of distances from random points in the fluid phase to the nearest fiber. This distribution follows a Rayleigh distribution, regardless of isotropy and data bias, and is fully described by a single parameter--the characteristic pore size of the network. The bias of the pore size estimate due to the missing fibers can be corrected by multiplication with the square root of the visible network fraction. We experimentally verify the validity of this approach by comparing our estimates with data obtained using confocal fluorescence microscopy, which represents the full structure of the network. As an important application, we investigate the pore size dependence of collagen and fibrin networks on protein concentration. We find that the pore size decreases with the square root of the concentration, consistent with a total fiber length that scales linearly with concentration.
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Affiliation(s)
- Nadine R Lang
- Department of Physics, University of Erlangen-Nuremberg, Erlangen, Germany
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30
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Schürmann S, Foersch S, Atreya R, Neumann H, Friedrich O, Neurath MF, Waldner MJ. Label-free imaging of inflammatory bowel disease using multiphoton microscopy. Gastroenterology 2013; 145:514-6. [PMID: 23850960 DOI: 10.1053/j.gastro.2013.06.054] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 05/15/2013] [Accepted: 06/10/2013] [Indexed: 12/14/2022]
Affiliation(s)
- Sebastian Schürmann
- Institute of Medical Biotechnology, University of Erlangen-Nuremberg, Erlangen, Germany
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31
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Vielreicher M, Schürmann S, Detsch R, Schmidt MA, Buttgereit A, Boccaccini A, Friedrich O. Taking a deep look: modern microscopy technologies to optimize the design and functionality of biocompatible scaffolds for tissue engineering in regenerative medicine. J R Soc Interface 2013; 10:20130263. [PMID: 23864499 DOI: 10.1098/rsif.2013.0263] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [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: 12/16/2022] Open
Abstract
This review focuses on modern nonlinear optical microscopy (NLOM) methods that are increasingly being used in the field of tissue engineering (TE) to image tissue non-invasively and without labelling in depths unreached by conventional microscopy techniques. With NLOM techniques, biomaterial matrices, cultured cells and their produced extracellular matrix may be visualized with high resolution. After introducing classical imaging methodologies such as µCT, MRI, optical coherence tomography, electron microscopy and conventional microscopy two-photon fluorescence (2-PF) and second harmonic generation (SHG) imaging are described in detail (principle, power, limitations) together with their most widely used TE applications. Besides our own cell encapsulation, cell printing and collagen scaffolding systems and their NLOM imaging the most current research articles will be reviewed. These cover imaging of autofluorescence and fluorescence-labelled tissue and biomaterial structures, SHG-based quantitative morphometry of collagen I and other proteins, imaging of vascularization and online monitoring techniques in TE. Finally, some insight is given into state-of-the-art three-photon-based imaging methods (e.g. coherent anti-Stokes Raman scattering, third harmonic generation). This review provides an overview of the powerful and constantly evolving field of multiphoton microscopy, which is a powerful and indispensable tool for the development of artificial tissues in regenerative medicine and which is likely to gain importance also as a means for general diagnostic medical imaging.
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Affiliation(s)
- M Vielreicher
- Department of Chemical and Biological Engineering, Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nuremberg, Paul-Gordan-Strasse 3, 91052 Erlangen, Germany.
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32
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Friedrich O, Wagner S, Battle AR, Schürmann S, Martinac B. Mechano-regulation of the beating heart at the cellular level--mechanosensitive channels in normal and diseased heart. Prog Biophys Mol Biol 2012; 110:226-38. [PMID: 22959495 DOI: 10.1016/j.pbiomolbio.2012.08.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Accepted: 08/09/2012] [Indexed: 01/22/2023]
Abstract
The heart as a contractile hollow organ finely tunes mechanical parameters such as stroke volume, stroke pressure and cardiac output according to filling volumes, filling pressures via intrinsic and neuronal routes. At the cellular level, cardiomyocytes in beating hearts are exposed to large mechanical stress during successive heart beats. Although the mechanisms of excitation-contraction coupling are well established in mammalian heart cells, the putative contribution of mechanosensitive channels to Ca²⁺ homeostasis, Ca²⁺ signaling and force generation has been primarily investigated in relation to heart disease states. For instance, transient receptor potential channels (TRPs) are up-regulated in animal models of congestive heart failure or hypertension models and seem to play a vital role in pathological Ca²⁺ overload to cardiomyocytes, thus aggravating the pathology of disease at the cellular level. Apart from that, the contribution of mechanosensitive channels (MsC) in the normal beating heart to the downstream force activation cascade has not been addressed. We present an overview of the current literature and concepts of mechanosensitive channel involvement in failing hearts and cardiomyopathies and novel data showing a likely contribution of Ca²⁺ influx via mechanosensitive channels in beating normal cardiomyocytes during systolic shortening.
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Affiliation(s)
- Oliver Friedrich
- Institute of Medical Biotechnology, Friedrich-Alexander-University Erlangen-Nuremberg, Paul-Gordan-Str. 3, 91052 Erlangen, Germany
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33
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Schürmann S, von Wegner F, Fink RHA, Friedrich O, Vogel M. Second harmonic generation microscopy probes different states of motor protein interaction in myofibrils. Biophys J 2011; 99:1842-51. [PMID: 20858429 DOI: 10.1016/j.bpj.2010.07.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Revised: 07/02/2010] [Accepted: 07/06/2010] [Indexed: 11/24/2022] Open
Abstract
The second harmonic generation (SHG) signal intensity sourced from skeletal muscle myosin II strongly depends on the polarization of the incident laser beam relative to the muscle fiber axis. This dependence is related to the second-order susceptibility χ((2)), which can be described by a single component ratio γ under generally assumed symmetries. We precisely extracted γ from SHG polarization dependence curves with an extended focal field model. In murine myofibrillar preparations, we have found two distinct polarization dependencies: With the actomyosin system in the rigor state, γ(rig) has a mean value of γ(rig) = 0.52 (SD = 0.04, n = 55); in a relaxed state where myosin is not bound to actin, γ(rel) has a mean value of γ(rel) = 0.24 (SD = 0.07, n = 70). We observed a similar value in an activated state where the myosin power stroke was pharmacologically inhibited using N-benzyl-p-toluene sulfonamide. In summary, different actomyosin states can be visualized noninvasively with SHG microscopy. Specifically, SHG even allows us to distinguish different actin-bound states of myosin II using γ as a parameter.
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Affiliation(s)
- Sebastian Schürmann
- Medical Biophysics, Institute of Physiology and Pathophysiology, Heidelberg University, Heidelberg, Germany
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Friedrich O, Both M, Weber C, Schürmann S, Teichmann MDH, von Wegner F, Fink RHA, Vogel M, Chamberlain JS, Garbe C. Microarchitecture is severely compromised but motor protein function is preserved in dystrophic mdx skeletal muscle. Biophys J 2010; 98:606-16. [PMID: 20159157 DOI: 10.1016/j.bpj.2009.11.005] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2009] [Revised: 10/27/2009] [Accepted: 11/05/2009] [Indexed: 10/19/2022] Open
Abstract
Progressive force loss in Duchenne muscular dystrophy is characterized by degeneration/regeneration cycles and fibrosis. Disease progression may involve structural remodeling of muscle tissue. An effect on molecular motorprotein function may also be possible. We used second harmonic generation imaging to reveal vastly altered subcellular sarcomere microarchitecture in intact single dystrophic mdx muscle cells (approximately 1 year old). Myofibril tilting, twisting, and local axis deviations explain at least up to 20% of force drop during unsynchronized contractile activation as judged from cosine angle sums of myofibril orientations within mdx fibers. In contrast, in vitro motility assays showed unaltered sliding velocities of single mdx fiber myosin extracts. Closer quantification of the microarchitecture revealed that dystrophic fibers had significantly more Y-shaped sarcomere irregularities ("verniers") than wild-type fibers (approximately 130/1000 microm(3) vs. approximately 36/1000 microm(3)). In transgenic mini-dystrophin-expressing fibers, ultrastructure was restored (approximately 38/1000 microm(3) counts). We suggest that in aged dystrophic toe muscle, progressive force loss is reflected by a vastly deranged micromorphology that prevents a coordinated and aligned contraction. Second harmonic generation imaging may soon be available in routine clinical diagnostics, and in this work we provide valuable imaging tools to track and quantify ultrastructural worsening in Duchenne muscular dystrophy, and to judge the beneficial effects of possible drug or gene therapies.
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Affiliation(s)
- O Friedrich
- Medical Biophysics, Institute of Physiology and Pathophysiology, Ruprecht Karls University, Heidelberg, Germany.
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von Wegner F, Ober T, Weber C, Schürmann S, Winter R, Friedrich O, Fink RHA, Vogel M. Velocity distributions of single F-actin trajectories from a fluorescence image series using trajectory reconstruction and optical flow mapping. J Biomed Opt 2008; 13:054018. [PMID: 19021398 DOI: 10.1117/1.2982525] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We present an approach for the computation of single-object velocity statistics in a noisy fluorescence image series. The algorithm is applied to molecular imaging data from an in vitro actin-myosin motility assay. We compare the relative efficiency of wavelet and curvelet transform denoising in terms of noise reduction and object restoration. It is shown that while both algorithms reduce background noise efficiently, curvelet denoising restores the curved edges of actin filaments more reliably. Noncrossing spatiotemporal actin trajectories are unambiguously identified using a novel segmentation scheme that locally combines the information of 2-D and 3-D segmentation. Finally, the optical flow vector field for the image sequence is computed via the 3-D structure tensor and mapped to the segmented trajectories. Using single-trajectory statistics, the global velocity distribution extracted from an image sequence is decomposed into the contributions of individual trajectories. The technique is further used to analyze the distribution of the x and y components of the velocity vectors separately, and it is shown that directed actin motion is found in myosin extracts from single skeletal muscle fibers. The presented approach may prove helpful to identify actin filament subpopulations and to analyze actin-myosin interaction kinetics under biochemical regulation.
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Affiliation(s)
- Frederic von Wegner
- University of Heidelberg, Institute of Physiology and Pathophysiology, Medical Biophysics Group, Im Neuenheimer Feld 326, 69120 Heidelberg, Germany
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von Samson-Himmelstjerna G, Fritzen B, Demeler J, Schürmann S, Rohn K, Schnieder T, Epe C. Cases of reduced cyathostomin egg-reappearance period and failure of Parascaris equorum egg count reduction following ivermectin treatment as well as survey on pyrantel efficacy on German horse farms. Vet Parasitol 2007; 144:74-80. [PMID: 17112667 DOI: 10.1016/j.vetpar.2006.09.036] [Citation(s) in RCA: 140] [Impact Index Per Article: 8.2] [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: 08/02/2006] [Revised: 09/15/2006] [Accepted: 09/21/2006] [Indexed: 11/16/2022]
Abstract
In 2003 and 2004, on a total of 63 different German horse farms, a survey using the faecal egg count reduction (FECR) test was performed to investigate the efficacy of ivermectin (IVM, Ivomec) and pyrantel (PYR, Banminth) treatment against gastro-intestinal nematodes in a total of 767 horses. IVM treatment resulted in 100% reduction of the cyathostomin egg production 14 and 21 days post-treatment (d.p.t.) on 37 farms. On the remaining five farms, the mean faecal egg count reduction ranged between 97.7 and 99.9%. The mean cyathostomin FECR following PYR treatment ranged between 92.2 and 100% on the 25 farms tested. Therefore, based on the 90% FECR threshold suggested for detection of anthelmintic resistance in horses, neither IVM nor PYR anthelmintic resistance was detected. However, if the thresholds recommended for the detection of resistance in small ruminants were applied, on one and four farms signs of reduced IVM and PYR efficacy, respectively, were observed. In 2005, to further investigate these findings, the cyathostomin egg-reappearance period (ERP) following IVM treatment was examined on six selected farms, two of which were found to show less than 99.8% FECR in the previous survey. On these two latter farms, the ERP was less than 5 weeks, while on the other four it was at least 8 weeks. Earlier investigations described IVM cyathostomin ERP of at least 9 weeks. The efficacy of IVM to reduce Parascaris equorum egg excretion was also studied. On one farm in 2 consecutive years, IVM treatment did not lead to a significant reduction in P. equorum faecal egg counts in one and five young horses, respectively.
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Abstract
In the industrialized nations headache prevalence is increasing in children and adolescents. The nosologic classification determines the therapeutic strategy to follow. Three case reports illustrate the optimal cooperation of both a pediatric outpatient pain clinic and a pediatric psychosomatic pain clinic. We report on (1) a girl aged 2 years and 7 months with a 4-month history of headache episodes lasting about 15 min each with concomitant symptoms; (2) an 11-year-old boy with Schimmelpenning-Feuerstein-Mims syndrome, symptomatic focal epilepsy, psychomotor retardation, mild postinfectious internal hydrocephalus, and repeated heat-triggered episodes of right-sided headache beginning suddenly with a duration of 5-30 min and concomitant flush of his hemiface; and (3) a 12-year-old boy who for about 2 years has suffered from "migraine" 3 times a week, significantly impairing his quality of life. We discuss the patients' courses, diagnostic pitfalls, and therapeutic options. For the optimal treatment of children with headache not easily fitting into one of the categories, with significant comorbidity present, or if there is no adequate response to therapy conforming with guidelines, the help of an interdisciplinary pediatric pain clinic is invaluable.
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Affiliation(s)
- C Wamsler
- Vodafone Stiftungsinstitut für Kinderschmerztherapie und Pädiatrische Palliativmedizin (IKP), Vestische Kinder- und Jugendklinik Datteln der Universität Witten/Herdecke.
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Schürmann S, Damschen U, Dobe M, Berrang J, Wamsler C, Ströhlein A, Henkel W, Menke A, Baumhöfner G, Elsner U, Zernikow B. Interdisziplinär und multiprofessionell im besten Sinn - Erste interdisziplinäre Kinderschmerzambulanz in Deutschland. ACTA ACUST UNITED AC 2005. [DOI: 10.1055/s-2005-865192] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kotzka J, Müller-Wieland D, Roth G, Kremer L, Munck M, Schürmann S, Knebel B, Krone W. Sterol regulatory element binding proteins (SREBP)-1a and SREBP-2 are linked to the MAP-kinase cascade. J Lipid Res 2000; 41:99-108. [PMID: 10627507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
The classic sterol regulatory cis element (sre-1) in the LDL receptor promoter mediates sterol regulatory element binding protein (SREBP)-binding and the effects of insulin and platelet derived growth factor (PDGF). To elucidate whether SREBP-1a and SREBP-2 play a direct role in insulin and PDGF action, stable cell lines of HepG2 deficient in either SREBP-1 or SREBP-2 were used. Transfection of these cells with the wild-type promoter fragment of the low density lipoprotein (LDL) receptor gene showed that the effects of insulin and PDGF were significantly reduced in both, SREBP-1- as well as SREBP-2-deficient cells. Insulin and PDGF action could be reconstituted again in these deficient cell lines by reintroducing SREBP-1a or SREBP-2. Preincubation of cells with either the phosphatidylinositol (PI)-3 kinase inhibitor wortmannin or the mitogen-activated protein (MAP) kinase cascade inhibitor PD 98059 showed that the latter abolished the stimulatory effects of insulin and PDGF on LDL receptor promoter activity completely, whereas wortmannin had no effect. Overexpression of upstream activators of the MAP kinases, like MEKK1 or MEK1, stimulated LDL receptor promoter activity several fold in an sre-1 related manner. These effects could be enhanced by coexpression of the transcriptional active N-terminal domains of SREBP-1a and SREBP-2. Using the heterologous Gal-4 system, we could show that intracellular activation of the MAP kinase cascade by ectopic expression of MEKK1 or MEK1 has a direct stimulatory effect on the transcriptional activity of SREBP-1a and SREBP-2. Experimental evidence for a direct link between MAP kinases and SREBPs was obtained due to the MAP kinases ERK1 and ERK2 phosphorylating recombinant GST-fusion proteins of SREBP-1a and SREBP-2, in vitro. We conclude that SREBP-1a and SREBP-2 mediate different regulatory effects converging at sre-1 and that they appear to be linked to the MAP kinase cascade, possibly being direct substrates of ERK1 and ERK2.
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Affiliation(s)
- J Kotzka
- Klinik II und Poliklinik für Innere Medizin at the Center of Molecular Medicine Cologne, D-50924 Cologne, Germany
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Döpfner M, Lehmkuhl G, Schürmann S. [Therapy program for children with hyperkinetic and oppositional problem behavior--organization and single case evaluation]. Z Kinder Jugendpsychiatr Psychother 1996; 24:145-63. [PMID: 9459672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
After a review of the research on the effectiveness of the different treatment modalities used in multimodal treatment of children with hyperkinetic disorders, a decision tree is described for planning multimodal treatment for school-aged children. Differences in treating preschool children are discussed. A mulitmodal treatment program for children with hyperkinetic and oppositional behavior problems is then described. It can be used for children aged 3 to 12 years old. The program has two parts, the parent-child program and the teacher-child program. The program contains intervention units that can be combined as necessary depending on the individual problem configuration. A case study is presented to illustrate the effects of this program in combination with stimulant medication.
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Affiliation(s)
- M Döpfner
- Klinik und Poliklinik für Psychiatrie, Universität zu Köln
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