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Leonard K, Mavropoulos SA, Mazurek R, Ishikawa K. Swine Model of Coronary Artery Dissection. Methods Mol Biol 2024; 2803:219-226. [PMID: 38676896 DOI: 10.1007/978-1-0716-3846-0_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2024]
Abstract
Coronary artery dissection (CAD) is the intimal tearing of the coronary arterial wall and can be iatrogenic, spontaneous, or traumatic in origin. CAD is a rare but challenging condition that can cause significant hemodynamic compromise. Management strategies for CAD, such as the use of mechanical circulatory support devices, are available in the clinical setting. However, the incidence, etiology, and optimal management of CAD are not well-defined, emphasizing the need for adequate animal models in preclinical studies. Large animal models provide the human-like conditions necessary for testing and development of potential treatment strategies. In this chapter, we describe a method for the creation of a CAD swine model.
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Affiliation(s)
- Kyra Leonard
- Cardiovascular Research Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Spyros A Mavropoulos
- Cardiovascular Research Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Renata Mazurek
- Cardiovascular Research Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kiyotake Ishikawa
- Cardiovascular Research Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
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2
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El-Menyar A, Khan NA, Naqvi SGA, Al-Thani H. Patterns of horse and camel- related injuries: A descriptive analysis from a national trauma registry (2007-2021). Injury 2023; 54:111093. [PMID: 37806821 DOI: 10.1016/j.injury.2023.111093] [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: 04/09/2023] [Revised: 09/26/2023] [Accepted: 10/02/2023] [Indexed: 10/10/2023]
Abstract
BACKGROUND The large animal-related injuries are emerging major trauma but remain underestimated public health problem worldwide. We aimed to determine the incidence, clinical characteristics, mechanisms and patterns of horse and camel-related injuries (HCRIs) in a Middle Eastern country. METHODS A retrospective analysis of all patients who were hospitalized due to HCRIs was conducted. Data included patient's demographics, mechanism of injury, anatomical location and severity of injury, and hospital outcomes. RESULTS Between November 2007 and December 2021, there were 273 hospitalized patients with HCRIs representing1.3 % of the total trauma admissions. Of these, 145 (53.1 %) and 128 (46.9 %) were horse (HRI) and camel-related injuries (CRI) respectively. The most common presenting age group of the cohort was 20-29 years and 88 % were males. Patients with HRIs were younger (27.5 ± 11 years) than CRIs (34 ± 13.5 years). Injuries to the extremities were the most common (62 % vs. 40 %), followed by the head injury (25.5 % vs. 31 %) among the HRIs and CRIs, respectively. The most common mechanism of injury was falling off followed by getting kicked by the HCRIs. Major trauma (ISS ≥12) was found in 23 % of HRIs (47.5 %) and CRIs (52.5 %). Only 5 % of patients had shock index >0.90 on admission; two thirds were due to CRIs. There were four fatalities (1.5 %), all attributed to traumatic brain injury, of which three were due to HRIs and one due to CRIs. CONCLUSION This study reveals that HCRIs predominantly affect young adult males and may involve serious injuries, exhibit distinct injury patterns, however, it is associated with low mortality. Preventive measures need to be revisited.
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Affiliation(s)
- Ayman El-Menyar
- Department of Surgery, Clinical Research, Trauma & Vascular Surgery, Hamad General Hospital, Doha, Qatar; Department of Clinical Medicine, Weill Cornell Medical College, Doha, Qatar.
| | - Naushad A Khan
- Department of Surgery, Clinical Research, Trauma & Vascular Surgery, Hamad General Hospital, Doha, Qatar
| | - Syed G A Naqvi
- Department of Radiology, Hamad General Hospital, Doha, Qatar
| | - Hassan Al-Thani
- Department of Surgery, Trauma and Vascular Surgery, Hamad General Hospital, Doha, Qatar
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3
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Lue PY, Oliver MH, Neeff M, Thorne PR, Suzuki-Kerr H. Sheep as a large animal model for hearing research: comparison to common laboratory animals and humans. Lab Anim Res 2023; 39:31. [PMID: 38012676 PMCID: PMC10680324 DOI: 10.1186/s42826-023-00182-3] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 11/10/2023] [Accepted: 11/15/2023] [Indexed: 11/29/2023] Open
Abstract
Sensorineural hearing loss (SNHL), caused by pathology in the cochlea, is the most common type of hearing loss in humans. It is generally irreversible with very few effective pharmacological treatments available to prevent the degenerative changes or minimise the impact. Part of this has been attributed to difficulty of translating "proof-of-concept" for novel treatments established in small animal models to human therapies. There is an increasing interest in the use of sheep as a large animal model. In this article, we review the small and large animal models used in pre-clinical hearing research such as mice, rats, chinchilla, guinea pig, rabbit, cat, monkey, dog, pig, and sheep to humans, and compare the physiology, inner ear anatomy, and some of their use as model systems for SNHL, including cochlear implantation surgeries. Sheep have similar cochlear anatomy, auditory threshold, neonatal auditory system development, adult and infant body size, and number of birth as humans. Based on these comparisons, we suggest that sheep are well-suited as a potential translational animal model that bridges the gap between rodent model research to the clinical use in humans. This is especially in areas looking at changes across the life-course or in specific areas of experimental investigation such as cochlear implantation and other surgical procedures, biomedical device development and age-related sensorineural hearing loss research. Combined use of small animals for research that require higher throughput and genetic modification and large animals for medical translation could greatly accelerate the overall translation of basic research in the field of auditory neuroscience from bench to clinic.
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Affiliation(s)
- Po-Yi Lue
- Department of Physiology, The University of Auckland, Auckland, New Zealand
- Eisdell Moore Centre, The University of Auckland, Auckland, New Zealand
| | - Mark H Oliver
- Liggins Institute, The University of Auckland, Auckland, New Zealand
- Ngapouri Research Farm Laboratory, University of Auckland, Waiotapu, New Zealand
| | - Michel Neeff
- Department of Physiology, The University of Auckland, Auckland, New Zealand
- Department of Surgery, Auckland District Health Board, Auckland, New Zealand
| | - Peter R Thorne
- Department of Physiology, The University of Auckland, Auckland, New Zealand
- Eisdell Moore Centre, The University of Auckland, Auckland, New Zealand
- Section of Audiology, The University of Auckland, Auckland, New Zealand
| | - Haruna Suzuki-Kerr
- Department of Physiology, The University of Auckland, Auckland, New Zealand.
- Eisdell Moore Centre, The University of Auckland, Auckland, New Zealand.
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4
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O'Leary C, Forte G, Mitchell NL, Youshani AS, Dyer A, Wellby MP, Russell KN, Murray SJ, Jolinon N, Jones SA, Stacey K, Davis DM, Henckaerts E, Palmer DN, Kamaly-Asl I, Bigger BW. Intraparenchymal convection enhanced delivery of AAV in sheep to treat Mucopolysaccharidosis IIIC. J Transl Med 2023; 21:437. [PMID: 37407981 PMCID: PMC10320977 DOI: 10.1186/s12967-023-04208-1] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 05/15/2023] [Indexed: 07/07/2023] Open
Abstract
BACKGROUND Mucopolysaccharidosis IIIC (MPSIIIC) is one of four Sanfilippo diseases sharing clinical symptoms of severe cognitive decline and shortened lifespan. The missing enzyme, heparan sulfate acetyl-CoA: α-glucosaminide-N-acetyltransferase (HGSNAT), is bound to the lysosomal membrane, therefore cannot cross the blood-brain barrier or diffuse between cells. We previously demonstrated disease correction in MPSIIIC mice using an Adeno-Associated Vector (AAV) delivering HGSNAT via intraparenchymal brain injections using an AAV2 derived AAV-truetype (AAV-TT) serotype with improved distribution over AAV9. METHODS Here, intraparenchymal AAV was delivered in sheep using catheters or Hamilton syringes, placed using Brainlab cranial navigation for convection enhanced delivery, to reduce proximal vector expression and improve spread. RESULTS Hamilton syringes gave improved AAV-GFP distribution, despite lower vector doses and titres. AAV-TT-GFP displayed moderately better transduction compared to AAV9-GFP but both serotypes almost exclusively transduced neurons. Functional HGSNAT enzyme was detected in 24-37% of a 140g gyrencephalic sheep brain using AAV9-HGSNAT with three injections in one hemisphere. CONCLUSIONS Despite variabilities in volume and titre, catheter design may be critical for efficient brain delivery. These data help inform a clinical trial for MPSIIIC.
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Affiliation(s)
- Claire O'Leary
- Stem Cell & Neurotherapies, Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology Medicine and Health, University of Manchester, Manchester, UK
- The Geoffrey Jefferson Brain Research Centre, University of Manchester, Manchester Academic Health Science Centre, Northern Care Alliance, Manchester, UK
| | - Gabriella Forte
- Stem Cell & Neurotherapies, Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology Medicine and Health, University of Manchester, Manchester, UK
| | - Nadia L Mitchell
- Department of Molecular Biosciences, Faculty of Agriculture and Life Sciences, Lincoln University, Lincoln, 7647, New Zealand
- Department of Radiology, University of Otago, Christchurch, 8140, New Zealand
| | - Amir Saam Youshani
- Stem Cell & Neurotherapies, Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology Medicine and Health, University of Manchester, Manchester, UK
- The Geoffrey Jefferson Brain Research Centre, University of Manchester, Manchester Academic Health Science Centre, Northern Care Alliance, Manchester, UK
| | - Adam Dyer
- Department of Infectious Diseases, School of Immunology and Microbial Sciences, King's College London, London, UK
| | - Martin P Wellby
- Department of Molecular Biosciences, Faculty of Agriculture and Life Sciences, Lincoln University, Lincoln, 7647, New Zealand
| | - Katharina N Russell
- Department of Molecular Biosciences, Faculty of Agriculture and Life Sciences, Lincoln University, Lincoln, 7647, New Zealand
| | - Samantha J Murray
- Department of Molecular Biosciences, Faculty of Agriculture and Life Sciences, Lincoln University, Lincoln, 7647, New Zealand
| | - Nelly Jolinon
- Department of Infectious Diseases, School of Immunology and Microbial Sciences, King's College London, London, UK
| | - Simon A Jones
- Manchester Centre for Genomic Medicine, Willink Unit, Manchester University NHS Foundation Trust, Manchester, UK
| | - Kevin Stacey
- Lydia Becker Institute of Immunology and Inflammation, Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Faculty of Biology Medicine and Health, Manchester Collaborative Centre for Inflammation Research, University of Manchester, Manchester, UK
| | - Daniel M Davis
- Department of Life Sciences, Imperial College London, Sir Alexander Fleming Building, South Kensington, London, UK
| | - Els Henckaerts
- Department of Infectious Diseases, School of Immunology and Microbial Sciences, King's College London, London, UK
- Laboratory of Viral Cell Biology & Therapeutics, Department of Cellular and Molecular Medicine and Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
| | - David N Palmer
- Department of Molecular Biosciences, Faculty of Agriculture and Life Sciences, Lincoln University, Lincoln, 7647, New Zealand
- Department of Radiology, University of Otago, Christchurch, 8140, New Zealand
| | - Ian Kamaly-Asl
- The Geoffrey Jefferson Brain Research Centre, University of Manchester, Manchester Academic Health Science Centre, Northern Care Alliance, Manchester, UK
- Department of Paediatric Neurosurgery, Royal Manchester Children's Hospital, Manchester, UK
| | - Brian W Bigger
- Stem Cell & Neurotherapies, Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology Medicine and Health, University of Manchester, Manchester, UK.
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5
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Cheng YY, Hu YF, Hsieh PCH. The Role of Large Animal Models in Cardiac Regeneration Research Using Human Pluripotent Stem Cell-Derived Cardiomyocytes. Curr Cardiol Rep 2023; 25:325-331. [PMID: 37074564 DOI: 10.1007/s11886-023-01857-y] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/08/2023] [Indexed: 04/20/2023]
Abstract
PURPOSE OF REVIEW Heart failure leads to high mortality. The failing myocardium cannot often be rescued as heart regeneration is mostly compromised by disease progress. Stem cell therapy is a strategy under development to replace the impaired myocardium for recovery after heart injury. RECENT FINDINGS Many studies have provided evidence of the beneficial effects of pluripotent stem cell-derived cardiomyocyte (CM) implantation into diseased rodent hearts, but there are still many challenges and limitations to replicating the same effects in large animal models for preclinical validation. In this review, we summarize progress in the use of pluripotent stem cell-derived CMs in large animal models based on three key parameters: species selection, cell source, and delivery. Most importantly, we discuss the current limitations and challenges that need to be solved to advance this technology to the translational stage.
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Affiliation(s)
- Yuan-Yuan Cheng
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Yu-Feng Hu
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
- Heart Rhythm Center, Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Patrick Ching-Ho Hsieh
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan.
- Graduate Institute of Medical Genomics and Proteomics and Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.
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6
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Wilson-Frank C. Toxicology and Analytical Chemistry. Vet Clin North Am Food Anim Pract 2023; 39:157-164. [PMID: 36731995 DOI: 10.1016/j.cvfa.2022.11.001] [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: 02/04/2023] Open
Abstract
Knowing how to effectively use veterinary diagnostic toxicology laboratories is key when navigating suspect toxicoses in ruminants. This begins with establishing a causal relationship between clinical signs and potential sources of exposure, followed by collecting the appropriate samples for toxicology testing. There are times in which a successful diagnosis is hindered by not obtaining a thorough case history and not knowing what specimens to collect, or how much specimen to submit, for toxicology testing. This article is intended to offer some guidance with respect to the effective use of veterinary toxicology/analytical chemistry laboratories when navigating suspect toxicology cases in ruminants.
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Affiliation(s)
- Christina Wilson-Frank
- Indiana Animal Disease Diagnostic Laboratory, Department of Comparative Pathobiology, Purdue University College of Veterinary Medicine, 406 South University, West Lafayette, IN 47907-2065, USA.
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7
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Li M, Lu S, Huang P, Xia T, Yu Z, Jiang W, Mao Y, Yang C, Yu S, Wu W, Zhang Y. High-quality, large-scale, semi-thin, & ultra-thin sections of the optic nerve in large animals: An optimized procedure. Exp Eye Res 2022; 219:108956. [PMID: 35367250 DOI: 10.1016/j.exer.2022.108956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 01/10/2022] [Accepted: 01/17/2022] [Indexed: 11/25/2022]
Abstract
Large animal model of optic nerve (ON) injury is an essential tool for translational medicine. Perfusion fixation with paraformaldehyde is mainly used for preparing the semi-thin (1-2 μm thick) and ultra-thin (<0.5 μm thick) sections of the ON tissues. However, this conventional fixation technique in large animals needs a large volume of fixatives, which increases the risk of toxic exposure and is environmentally unfriendly. Additionally, fixed residual ON cannot be used for other tests that require fresh tissue samples. Although conventional immersion fixation is feasible for preparing a semi-thin section of the ON in small animals (0.2-0.6 mm in diameter), it faces technical challenges when fixing the ON of large animals (3 mm in diameters), as increased diameter limits the permeability of the fixatives into deeper tissue. Therefore, we optimized the immersion-fixation method to obtain high-quality, large-scale, semi-thin, and ultra-thin sections for the ON of goat and rhesus macaques. Using this optimized technique, the ON microstructure was well preserved throughout the entire area of 1.5*1.5 square millimeters, allowing confident quantification of axon density/diameter on semi-thin section and identification of specific organelles and glial cells on ultra-thin sections. Furthermore, the optimized technique is a quick, simple, and environmentally friendly fixation method. Notably, the ON regions of large animals with or without an intact neurovascular system can be prepared for light and electron microscopy. In contrast, the residual unfixed ON from the same animal can be further utilized for experiments such as tissue culture and biomolecular tests.
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Affiliation(s)
- Mengyun Li
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Shenjian Lu
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - PingPing Huang
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Tian Xia
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Zhonghao Yu
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Wenhao Jiang
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Yiyang Mao
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Chen Yang
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Shuaishuai Yu
- School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, 325027, China
| | - Wencan Wu
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China.
| | - Yikui Zhang
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China.
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8
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Mazurek R, Ishikawa K. ELISpot Assay for Gene Therapy in Large Animal Studies. Methods Mol Biol 2022; 2573:323-332. [PMID: 36040606 DOI: 10.1007/978-1-0716-2707-5_25] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Formation of neutralizing antibodies and cellular immune response with repeat adeno-associated virus (AAV) gene therapy dosing are critical concerns in translational, large animal studies. The enzyme-linked immunospot/immunosorbent spot (ELISpot) assay introduced a way to track B- and/or T-cell response to therapy over time at a protein level. We describe the protocol for this assay looking at relative interferon (IFN)-γ secretion in pre- and post-AAV injections in a pig model.
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Affiliation(s)
- Renata Mazurek
- Cardiovascular Research Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kiyotake Ishikawa
- Cardiovascular Research Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
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9
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Lutter G, Bax L, Liu Y, Hansen JH, Frank D, Freitag-Wolf S, Simionescu A, Sathananthan J, Puehler T. Transcatheter mitral valve replacement: tissue in-growth after 4 weeks. Interact Cardiovasc Thorac Surg 2021; 32:1-8. [PMID: 33279987 DOI: 10.1093/icvts/ivaa225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 08/11/2020] [Accepted: 09/03/2020] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES Tissue reaction to transcatheter mitral valve replacement in the mitral annulus remains to be elucidated. METHODS Trileaflet porcine pericardial valves were sewn onto self-expanding d-shaped nitinol stents, which were delivered transapically and in an off-pump fashion into the mitral position of 10 pigs. After at least 4 weeks of follow-up, gross pathological assessment and histological examination were performed. The specimens were stained with Movat's pentachrome, Elastica-van-Gieson and von Kossa staining. The leucocytes, B cells, T cells or macrophages were detected by specific immunohistochemical staining. RESULTS Proper stent positioning in the mitral annulus was achieved in 9/10 animals. Nine of 10 animals survived the desired observation period. In all but one, the mitral valve stent was well integrated into the left atrium and perpendicularly embedded into the annulus by 85 ± 24%. One animal had minor fractures in the nitinol struts and another animal showed tearing of 1 of 4 tethers. Histological examination demonstrated no major tissue reaction with the nitninol struts but well-preserved overall structures around the mitral annulus in 8/9 cases. CONCLUSIONS This is the first report demonstrating good in-growth of transcatheter-delivered anatomically shaped mitral valve stents after at least 4 weeks of follow-up. Histological examination demonstrated progressive healing and neointimalization.
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Affiliation(s)
- Georg Lutter
- Department of Experimental Cardiac Surgery and Heart Valve Replacement, Christian-Albrechts-University of Kiel, School of Medicine, UKSH, Kiel, Germany.,Department of Cardiovascular Surgery, Christian-Albrechts-University of Kiel, School of Medicine, UKSH, Kiel, Germany
| | - Lennart Bax
- Department of Experimental Cardiac Surgery and Heart Valve Replacement, Christian-Albrechts-University of Kiel, School of Medicine, UKSH, Kiel, Germany.,Department of Cardiac and Vascular Surgery, Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | - Yazhou Liu
- Department of Experimental Cardiac Surgery and Heart Valve Replacement, Christian-Albrechts-University of Kiel, School of Medicine, UKSH, Kiel, Germany.,Department of Cardiovascular Surgery, Christian-Albrechts-University of Kiel, School of Medicine, UKSH, Kiel, Germany
| | | | - Derk Frank
- Medical center Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | - Sandra Freitag-Wolf
- Institute of Medical Informatics and Statistics, Kiel University, Kiel, Germany
| | | | - Janarthanan Sathananthan
- Centre for Heart Valve Innovation, St Paul's Hospital, University of British Columbia, Vancouver, BC, Canada
| | - Thomas Puehler
- Department of Experimental Cardiac Surgery and Heart Valve Replacement, Christian-Albrechts-University of Kiel, School of Medicine, UKSH, Kiel, Germany.,Department of Cardiovascular Surgery, Christian-Albrechts-University of Kiel, School of Medicine, UKSH, Kiel, Germany
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10
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Walsh WR, Pelletier M, Wills D, Wang T, Bannigan S, Vizesi F. Undercut macrostructure topography on and within an interbody cage improves biomechanical stability and interbody fusion. Spine J 2020; 20:1876-1886. [PMID: 32645503 DOI: 10.1016/j.spinee.2020.06.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 06/29/2020] [Accepted: 06/30/2020] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT The interface and interactions between an interbody cage, graft material, and host bone can all participate in the fusion. Shortcomings of Poly(aryl-ether-ether-ketone) interbody cages have been addressed with novel titanium surfaces. Titanium surfaces paired with macroscale topography features on the endplates and within the aperture may provide additional benefits. PURPOSE To evaluate the influence of cage design parameters on interbody fusion in a large animal preclinical model. STUDY DESIGN/SETTING A comparative preclinical large animal model was performed to evaluate how macroscale topography features of an interbody cage can facilitate early integration between the host bone, graft material, and interbody cage and these effects on biomechanical stability and fusion. METHODS Forty single level interbody fusions (L4-L5) using iliac crest autograft and bilateral pedicle screw fixation were performed in adult sheep to evaluate the effect of undercut macrostructure topography features of an interbody cage on the endplates and within the aperture. Fusions were evaluated at 6 and 12 weeks (n=10 per group) using radiography, microcomputed tomography, biomechanical integrity, and histology endpoints. RESULTS The presence of the undercut macrostructures present on the endplates and within the aperture statistically improved biomechanical integrity at 6 and 12 weeks compared with controls. Microcomputed tomography and histology demonstrated bony interdigitation within the endplate and aperture features contributing to the improvement in properties. CONCLUSIONS The present study demonstrates that Poly(aryl-ether-ether-ketone) implants with titanium surfaces can be augmented by undercut macrostructures present on the endplates and within the aperture to provide opportunities for a series of anchoring points that, with new bone formation and remodelling, result in earlier and improved biomechanical integrity of the treated level. CLINICAL SIGNIFICANCE This preclinical study showed that bone interdigitation with the undercut macrostructures present on the endplates and within the aperture resulted in improved fusion and biomechanical stability in a clinically relevant spinal fusion model. Future clinical study is warranted to evaluate such implants' performance in humans.
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Affiliation(s)
- William R Walsh
- Surgical & Orthopedic Research Laboratories, Prince of Wales Clinical, UNSW Sydney, Level 1, Clinical Sciences Building, Gate 6, Avoca St, Sydney, NSW 2031, Australia.
| | | | - Dan Wills
- Surgical & Orthopedic Research Laboratories, Prince of Wales Clinical, UNSW Sydney, Level 1, Clinical Sciences Building, Gate 6, Avoca St, Sydney, NSW 2031, Australia
| | - Tian Wang
- Surgical & Orthopedic Research Laboratories, Prince of Wales Clinical, UNSW Sydney, Level 1, Clinical Sciences Building, Gate 6, Avoca St, Sydney, NSW 2031, Australia
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11
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Kringe L, Sena ES, Motschall E, Bahor Z, Wang Q, Herrmann AM, Mülling C, Meckel S, Boltze J. Quality and validity of large animal experiments in stroke: A systematic review. J Cereb Blood Flow Metab 2020; 40:2152-2164. [PMID: 32576074 PMCID: PMC7585919 DOI: 10.1177/0271678x20931062] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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] [Indexed: 02/01/2023]
Abstract
An important factor for successful translational stroke research is study quality. Low-quality studies are at risk of biased results and effect overestimation, as has been intensely discussed for small animal stroke research. However, little is known about the methodological rigor and quality in large animal stroke models, which are becoming more frequently used in the field. Based on research in two databases, this systematic review surveys and analyses the methodological quality in large animal stroke research. Quality analysis was based on the Stroke Therapy Academic Industry Roundtable and the Animals in Research: Reporting In Vivo Experiments guidelines. Our analysis revealed that large animal models are utilized with similar shortcomings as small animal models. Moreover, translational benefits of large animal models may be limited due to lacking implementation of important quality criteria such as randomization, allocation concealment, and blinded assessment of outcome. On the other hand, an increase of study quality over time and a positive correlation between study quality and journal impact factor were identified. Based on the obtained findings, we derive recommendations for optimal study planning, conducting, and data analysis/reporting when using large animal stroke models to fully benefit from the translational advantages offered by these models.
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Affiliation(s)
- Leona Kringe
- Department of Neuroradiology, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany.,Faculty of Veterinary Medicine, Institute of Anatomy, Histology and Embryology, Leipzig University, Leipzig, Germany
| | - Emily S Sena
- Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - Edith Motschall
- Institute for Medical Biometry and Statistics, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany
| | - Zsanett Bahor
- Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - Qianying Wang
- Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - Andrea M Herrmann
- Department of Neuroradiology, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany.,Faculty of Veterinary Medicine, Institute of Anatomy, Histology and Embryology, Leipzig University, Leipzig, Germany
| | - Christoph Mülling
- Faculty of Veterinary Medicine, Institute of Anatomy, Histology and Embryology, Leipzig University, Leipzig, Germany
| | - Stephan Meckel
- Department of Neuroradiology, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany
| | - Johannes Boltze
- School of Life Sciences, University of Warwick, Coventry, UK
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12
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Zhang Y, Zhang S, Xia Y, Ji Y, Jiang W, Li M, Huang H, Xu M, Sun J, Ye Q, Hu Y, Wu W. In vivo evaluation of retinal ganglion cells and optic nerve's integrity in large animals by multi-modality analysis. Exp Eye Res 2020; 197:108117. [PMID: 32598972 DOI: 10.1016/j.exer.2020.108117] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 05/26/2020] [Accepted: 06/14/2020] [Indexed: 12/14/2022]
Abstract
Large animal models of optic nerve injury are essential for translating novel findings into effective therapies due to their similarity to humans in many respects. However, most current tests evaluating the integrity of retinal ganglion cells (RGCs) and optic nerve (ON) are based on rodent animal models. We aimed to evaluate and optimize the in vivo methods to assess RGCs and ON's function and structure in large animals in terms of reproducibility, simplicity and sensitivity. Both goats and rhesus macaques were employed in this study. By using goats, we found anesthesia with isoflurane or xylazine resulted in different effects on reproducibility of flash visual evoked potential (FVEP) and pattern electroretinogram (PERG). FVEP with the large-Ganzfeld stimulator was significantly more stable than that with mini-Ganzfeld stimulator. PERG with simultaneous binocular stimulation, with superior simplicity over separate monocular stimulation, was appliable in goats due to undetectable interocular crosstalk of PERG signals. After ON crush in goats, some FVEP components, PERG, OCT and PLR demonstrated significant changes, in line with the histological study. By using rhesus macaque, we found the implicit time of PVEP, FVEP and PERG were significantly more reproducible than amplitudes, and OCT and PLR demonstrated small intersession variation. In summary, we established an optimized system to evaluate integrity of RGCs and ON in large animals in vivo, facilitating usage of large animal models of optic nerve diseases.
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Affiliation(s)
- Yikui Zhang
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China.
| | - Si Zhang
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Yu Xia
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Yuanfei Ji
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Wenhao Jiang
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Mengyun Li
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Haoliang Huang
- Department of Ophthalmology, Stanford University School of Medicine, Palo Alto, United States
| | - Mingna Xu
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Jiaying Sun
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Qian Ye
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China
| | - Yang Hu
- Department of Ophthalmology, Stanford University School of Medicine, Palo Alto, United States.
| | - Wencan Wu
- The Eye Hospital, School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou, 325027, China.
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13
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Hotham WE, Henson FMD. The use of large animals to facilitate the process of MSC going from laboratory to patient-'bench to bedside'. Cell Biol Toxicol 2020; 36:103-114. [PMID: 32206986 PMCID: PMC7196082 DOI: 10.1007/s10565-020-09521-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 03/03/2020] [Indexed: 12/20/2022]
Abstract
Large animal models have been widely used to facilitate the translation of mesenchymal stem cells (MSC) from the laboratory to patient. MSC, with their multi-potent capacity, have been proposed to have therapeutic benefits in a number of pathological conditions. Laboratory studies allow the investigation of cellular and molecular interactions, while small animal models allow initial 'proof of concept' experiments. Large animals (dogs, pigs, sheep, goats and horses) are more similar physiologically and structurally to man. These models have allowed clinically relevant assessments of safety, efficacy and dosing of different MSC sources prior to clinical trials. In this review, we recapitulate the use of large animal models to facilitate the use of MSC to treat myocardial infarction-an example of one large animal model being considered the 'gold standard' for research and osteoarthritis-an example of the complexities of using different large animal models in a multifactorial disease. These examples show how large animals can provide a research platform that can be used to evaluate the value of cell-based therapies and facilitate the process of 'bench to bedside'.
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Affiliation(s)
- W E Hotham
- Division of Trauma and Orthopaedic Surgery, Cambridge University, Cambridge, UK.
| | - F M D Henson
- Division of Trauma and Orthopaedic Surgery, Cambridge University, Cambridge, UK
- Animal Health Trust, Newmarket, UK
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14
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Abstract
Increase in cardiac afterload as represented by hypertension is an established risk factor for cardiovascular diseases. Animal models of increased cardiac afterload offer studies aiming at identifying key molecular mechanisms and developing new therapeutic approaches. We have reported that banding of the ascending aorta in pigs results in significant cardiac hypertrophy and increased myocardial fibrosis at the chronic stages. These changes were accompanied by increased stiffness of the heart, but not by systolic dysfunction. In this chapter, we describe methods to surgically band the ascending aorta in pigs. After 3 months, animals develop systolic left ventricular pressure of >200 mmHg with above described changes in the heart.
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Affiliation(s)
- Olympia Bikou
- Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Satoshi Miyashita
- Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kiyotake Ishikawa
- Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
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15
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Abstract
Abnormalities of tooth number in humans, such as agenesis and supernumerary tooth formation, are closely related to diphyodont development. There is an increasing demand to understand the molecular and cellular mechanisms behind diphyodont development through the use of large animal models, since they are the most similar to the mechanism of human tooth development. However, attempting to study diphyodont development in large animals remains challenging due to large tooth size, prolonged growth stage and embryo manipulation. Here, we characterized the expression of possible genes for diphyodont development and odontogenesis of an organoid bud from single cells of tooth germs in vitro using Wzhishan pig strain (WZSP). Following this, we used a method of ectopic transplantation of tooth germs at cap stage to dynamically track diphyodont development of tooth germs in mouse subrenal capsules to overcome the restrictions in pig embryos. The results showed that pig tooth germ at cap stage could restore diphyodont development and maintain efficient long-term survival and growth in mouse subrenal capsules, which is suitable for future manipulation of large mammalian tooth development. Our pilot study provided an alternative for studying diphyodont development in large mammals, which will further promote the use of pig as a diphyodont model similar to humans for craniofacial development study. Summary: Little is known about diphyodont development in large animals. Our pilot trial characterized this gene expression and developed an alternative method to track diphyodont development in pigs.
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Affiliation(s)
- Fu Wang
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China.,Department of Basic Oral Sciences, School of Stomatology, Dalian Medical University, Dalian 116044, China
| | - Guoqing Li
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China
| | - Zhifang Wu
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China
| | - Zhipeng Fan
- Laboratory of Molecular Signaling and Stem Cells Therapy, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China
| | - Min Yang
- Department of Basic Oral Sciences, School of Stomatology, Dalian Medical University, Dalian 116044, China
| | - Tingting Wu
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China
| | - Jinsong Wang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
| | - Chunmei Zhang
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China
| | - Songlin Wang
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China .,Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
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16
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Long RG, Zderic I, Gueorguiev B, Ferguson SJ, Alini M, Grad S, Iatridis JC. Effects of Level, Loading Rate, Injury and Repair on Biomechanical Response of Ovine Cervical Intervertebral Discs. Ann Biomed Eng 2018; 46:1911-1920. [PMID: 29926304 DOI: 10.1007/s10439-018-2077-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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: 01/23/2018] [Accepted: 06/13/2018] [Indexed: 12/15/2022]
Abstract
A need exists for pre-clinical large animal models of the spine to translate biomaterials capable of repairing intervertebral disc (IVD) defects. This study characterized the effects of cervical spinal level, loading rate, injury and repair with genipin-crosslinked fibrin (FibGen) on axial and torsional mechanics in an ovine cervical spine model. Cervical IVDs C2-C7 from nine animals were tested with cyclic tension-compression (- 240 to 100 N) and cyclic torsion (± 2° and ± 4°) tests at three rates (0.1, 1 and 2 Hz) in intact, injured and repaired conditions. Intact IVDs from upper cervical levels (C2-C4) had significantly higher torque range and torsional stiffness and significantly lower axial range of motion (ROM) and tensile compliance than IVDs from lower cervical levels (C5-C7). A tenfold increase in loading rate significantly increased torque range and torsional stiffness 4-8% (depending on amplitude) (p < 0.001). When normalized to intact, FibGen significantly restored torque range (FibGen: 0.96 ± 0.14, Injury: 0.88 ± 0.14, p = 0.03) and axial ROM (FibGen: 1.00 ± 0.05, Injury: 1.04 ± 0.15, p = 0.02) compared to Injury, with a values of 1 indicating full repair. Cervical spinal level must be considered for controlling biomechanical evaluations, and FibGen restored some torsional and axial biomechanical properties to intact levels.
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Affiliation(s)
- Rose G Long
- AO Research Institute Davos, Clavadelstrasse 8, 7270, Davos, Switzerland.,Leni & Peter W. May Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, 1 Gustave Levy Place, Box 1188, New York, NY, 10029-6574, USA
| | - Ivan Zderic
- AO Research Institute Davos, Clavadelstrasse 8, 7270, Davos, Switzerland
| | - Boyko Gueorguiev
- AO Research Institute Davos, Clavadelstrasse 8, 7270, Davos, Switzerland
| | | | - Mauro Alini
- AO Research Institute Davos, Clavadelstrasse 8, 7270, Davos, Switzerland
| | - Sibylle Grad
- AO Research Institute Davos, Clavadelstrasse 8, 7270, Davos, Switzerland
| | - James C Iatridis
- Leni & Peter W. May Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, 1 Gustave Levy Place, Box 1188, New York, NY, 10029-6574, USA.
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17
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Abstract
Despite enormous efforts in treating myocardial infarction (MI) and subsequent heart failure, the recent statistics from the American Heart Association evidently show that there still remains room for improvements. To develop and translate new therapeutics toward clinics, large animal models that allow us to test new therapies in human-like conditions are of extraordinary importance. In this chapter, we describe detailed protocols for the creation of a closed-chest MI model in pigs. The advantages of this model include high survival rate (>90% after ischemia-reperfusion), adjustable MI size depending on coronary occlusion site, reproducible cardiac dysfunction, and relatively low invasive method. The temporary coronary occlusion method for ischemia-reperfusion injury as well as the permanent occlusion method, using clot injection or embolic coil implantation, are described. Furthermore, we describe the key steps needed for understanding, performing, and analyzing cardiac angiography and echocardiography in pigs.
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Affiliation(s)
- Olympia Bikou
- Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Shin Watanabe
- Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Roger J Hajjar
- Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kiyotake Ishikawa
- Cardiovascular Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
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18
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Bikou O, Ishikawa K, Fish KM, Zarragoikoetxea I, Hajjar RJ, Aguero J. Modeling Pulmonary Hypertension: A Pig Model of Postcapillary Pulmonary Hypertension. Methods Mol Biol 2018; 1816:367-83. [PMID: 29987835 DOI: 10.1007/978-1-4939-8597-5_29] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Pulmonary hypertension (PH) is a pathophysiological condition defined as an increase in mean pulmonary arterial pressure ≥25 mmHg at rest assessed by right heart catheterization.Based on hemodynamic criteria, precapillary PH is characterized by a mean pulmonary capillary wedge pressure ≤15 mmHg as opposed to the postcapillary PH by >15 mmHg. Postcapillary PH is one of the most common forms of PH, often caused by left ventricular dysfunction and heart failure.In this chapter, we describe protocols for creating a large animal model of postcapillary PH. It is induced by open chest surgery (lateral thoracotomy) to band the pulmonary veins. The model is characterized by low mortality, relatively easy surgical procedure with well reproducible results, and pulmonary and cardiac remodeling at the structural, functional, and molecular levels. The presence of right ventricular (RV) remodeling is of significant importance since right heart failure is the main cause of death in patients suffering from PH. One of the advantages of the model described in this chapter is that both adaptive and maladaptive forms of RV remodeling can be observed during the progression of the disease. This can help understand the progressive pathophysiology of RV failure in humans. Besides the description of the model, a detailed guidance of the RV functional assessment in pigs for both invasive (heart catheterization) and noninvasive (echocardiography) approaches is provided.
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19
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Brunetti-Pierri N, Ng P. Gene therapy with helper-dependent adenoviral vectors: lessons from studies in large animal models. Virus Genes 2017; 53:684-691. [PMID: 28593513 DOI: 10.1007/s11262-017-1471-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [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: 03/09/2017] [Accepted: 05/30/2017] [Indexed: 01/19/2023]
Abstract
Helper-dependent adenoviral vectors (HDAd) are deleted of all viral genes and they can efficiently transduce a wide variety of dividing and non-dividing cells to mediate high transgene expression levels. Unlike early generation adenoviral vectors, the absence of viral genes in HDAd results in long-term transgene expression without chronic toxicity and permits a large cloning capacity of 36 kb. Moreover, HDAd genomes exist extra-chromosomally thus minimizing the risks of germline transmission and insertional mutagenesis. For these reasons, HDAd offers tremendous potential for in vivo gene therapy. This chapter reviews preclinical studies using HDAd in large animal models to assess safety and efficacy in a wide variety of gene therapy applications.
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Affiliation(s)
- Nicola Brunetti-Pierri
- Telethon Institute of Genetics and Medicine, Pozzuoli, Italy.,Department of Translational Medicine, Federico II University, Naples, Italy
| | - Philip Ng
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA.
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20
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Perentos N, Nicol AU, Martins AQ, Stewart JE, Taylor P, Morton AJ. Techniques for chronic monitoring of brain activity in freely moving sheep using wireless EEG recording. J Neurosci Methods 2016; 279:87-100. [PMID: 27914975 DOI: 10.1016/j.jneumeth.2016.11.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 11/21/2016] [Accepted: 11/24/2016] [Indexed: 12/18/2022]
Abstract
BACKGROUND Large mammals with complex central nervous systems offer new possibilities for translational research into basic brain function. Techniques for monitoring brain activity in large mammals, however, are not as well developed as they are in rodents. NEW METHOD We have developed a method for chronic monitoring of electroencephalographic (EEG) activity in unrestrained sheep. We describe the methods for behavioural training prior to implantation, surgical procedures for implantation, a protocol for reliable anaesthesia and recovery, methods for EEG data collection, as well as data pertaining to suitability and longevity of different types of electrodes. RESULTS Sheep tolerated all procedures well, and surgical complications were minimal. Electrode types used included epidural and subdural screws, intracortical needles and subdural disk electrodes, with the latter producing the best and most reliable results. The implants yielded longitudinal EEG data of consistent quality for periods of at least a year, and in some cases up to 2 years. COMPARISON WITH EXISTING METHODS This is the first detailed methodology to be described for chronic brain function monitoring in freely moving unrestrained sheep. CONCLUSIONS The developed method will be particularly useful in chronic investigations of brain activity during normal behaviour that can include sleep, learning and memory. As well, within the context of disease, the method can be used to monitor brain pathology or the progress of therapeutic trials in transgenic or natural disease models in sheep.
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Affiliation(s)
- N Perentos
- Department of Physiology Development and Neuroscience, University of Cambridge, Downing Street, Cambridge, CB2 3DY, United Kingdom
| | - A U Nicol
- Department of Physiology Development and Neuroscience, University of Cambridge, Downing Street, Cambridge, CB2 3DY, United Kingdom
| | - A Q Martins
- Department of Physiology Development and Neuroscience, University of Cambridge, Downing Street, Cambridge, CB2 3DY, United Kingdom
| | - J E Stewart
- Department of Physiology Development and Neuroscience, University of Cambridge, Downing Street, Cambridge, CB2 3DY, United Kingdom
| | - P Taylor
- Department of Physiology Development and Neuroscience, University of Cambridge, Downing Street, Cambridge, CB2 3DY, United Kingdom
| | - A J Morton
- Department of Physiology Development and Neuroscience, University of Cambridge, Downing Street, Cambridge, CB2 3DY, United Kingdom.
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21
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Katsuki Y, Yagi H, Okitsu T, Kitago M, Tajima K, Kadota Y, Hibi T, Abe Y, Shinoda M, Itano O, Takeuchi S, Kitagawa Y. Endocrine pancreas engineered using porcine islets and partial pancreatic scaffolds. Pancreatology 2016; 16:922-30. [PMID: 27350058 DOI: 10.1016/j.pan.2016.06.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 05/12/2016] [Accepted: 06/16/2016] [Indexed: 02/09/2023]
Abstract
OBJECTIVES Because therapeutic options for severe diabetes are currently limited, there is a continuing need for new therapeutic strategies, especially in the field of regenerative medicine. Collaborative efforts across the fields of tissue engineering technology and islet biology may be able to create functionally engineered islets capable of restoring endocrine function in patients with insulin-dependent diabetes. METHODS This engineered scaffold was seeded with isolated primary porcine islets via the pancreatic duct using a multi-step infusion technique. Endocrine function of perfusion-cultured islets in the native scaffold was analyzed by immunohistochemical staining of insulin and glucagon as well as by the insulin stimulation test. RESULTS The pancreas in this large animal could be uniformly decellularized by perfusion with trypsin and TritonX-100 via the pancreatic duct, as shown by positive staining of extracellular matrix (ECM) components. These scaffolds derived from porcine pancreas were able to maintain the cellular integrity of islets that had repopulated the parenchymal space, which is fundamental for the restoration of endocrine function. Insulin release up to four days after islet infusion was maintained. CONCLUSIONS This scaffold from a large animal maintained islet survival and function in the short-term, retaining the cells as a solid organ in the parenchymal space after infusion through the pancreatic duct. These results suggest that this scaffold is suitable for further fabrication of fully functional bioengineered endocrine pancreases when implanted in vivo. Therefore, it may represent a key improvement in the field of beta-cell replacement therapy. Nonetheless, the facilitation of longer-term islet survival and studies of implantation in vivo is required for successful clinical translation.
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Affiliation(s)
- Yusuke Katsuki
- Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
| | - Hiroshi Yagi
- Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
| | - Teru Okitsu
- Center for International Research on Biomedical Systems (CIBiS), Institute of Industrial Science, The University of Tokyo, Meguro, Tokyo 153-8505, Japan.
| | - Minoru Kitago
- Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
| | - Kazuki Tajima
- Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
| | - Yoshie Kadota
- Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
| | - Taizo Hibi
- Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
| | - Yuta Abe
- Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
| | - Masahiro Shinoda
- Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
| | - Osamu Itano
- Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
| | - Shoji Takeuchi
- Center for International Research on Biomedical Systems (CIBiS), Institute of Industrial Science, The University of Tokyo, Meguro, Tokyo 153-8505, Japan.
| | - Yuko Kitagawa
- Department of Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo 160-8582, Japan.
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22
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Abstract
Stroke is a leading cause of serious long-term disability worldwide and the second leading cause of death in many countries. Long-time attempts to salvage dying neurons via various neuroprotective agents have failed in stroke translational research, owing in part to the huge gap between animal stroke models and stroke patients, which also suggests that rodent models have limited predictive value and that alternate large animal models are likely to become important in future translational research. The genetic background, physiological characteristics, behavioral characteristics, and brain structure of large animals, especially nonhuman primates, are analogous to humans, and resemble humans in stroke. Moreover, relatively new regional imaging techniques, measurements of regional cerebral blood flow, and sophisticated physiological monitoring can be more easily performed on the same animal at multiple time points. As a result, we can use large animal stroke models to decrease the gap and promote translation of basic science stroke research. At the same time, we should not neglect the disadvantages of the large animal stroke model such as the significant expense and ethical considerations, which can be overcome by rodent models. Rodents should be selected as stroke models for initial testing and primates or cats are desirable as a second species, which was recommended by the Stroke Therapy Academic Industry Roundtable (STAIR) group in 2009.
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Affiliation(s)
- Bin Cai
- Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, 20 Chazhong Road, Fuzhou, 350005, China.
| | - Ning Wang
- Department of Neurology and Institute of Neurology, First Affiliated Hospital, Fujian Medical University, 20 Chazhong Road, Fuzhou, 350005, China.
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23
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Nelson K, Bobba C, Ghadiali S, Jr DH, Black SM, Whitson BA. Animal models of ex vivo lung perfusion as a platform for transplantation research. World J Exp Med 2014; 4:7-15. [PMID: 24977117 PMCID: PMC4073219 DOI: 10.5493/wjem.v4.i2.7] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 01/23/2014] [Accepted: 03/14/2014] [Indexed: 02/05/2023] Open
Abstract
Ex vivo lung perfusion (EVLP) is a powerful experimental model for isolated lung research. EVLP allows for the lungs to be manipulated and characterized in an external environment so that the effect of specific ventilation/perfusion variables can be studied independent of other confounding physiologic contributions. At the same time, EVLP allows for normal organ level function and real-time monitoring of pulmonary physiology and mechanics. As a result, this technique provides unique advantages over in vivo and in vitro models. Small and large animal models of EVLP have been developed and each of these models has their strengths and weaknesses. In this manuscript, we provide insight into the relative strengths of each model and describe how the development of advanced EVLP protocols is leading to a novel experimental platform that can be used to answer critical questions in pulmonary physiology and transplant medicine.
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