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Regenerative Potential of Hydroxyapatite-Based Ceramic Biomaterial on Mandibular Cortical Bone: An In Vivo Study. Biomedicines 2023; 11:biomedicines11030877. [PMID: 36979856 PMCID: PMC10045626 DOI: 10.3390/biomedicines11030877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 02/19/2023] [Accepted: 03/08/2023] [Indexed: 03/15/2023] Open
Abstract
Reconstruction of bone defects and maintaining the continuity of the mandible is still a challenge in the maxillofacial surgery. Nowadays, the biomedical research within bone defect treatment is focussed on the therapy of using innovative biomaterials with specific characteristics consisting of the body’s own substances. Hydroxyapatite ceramic scaffolds have fully acceptable phase compositions, microstructures and compressive strengths for their use in regenerative medicine. The innovative hydroxyapatite ceramics used by us were prepared using the tape-casting method, which allows variation in the shape of samples after packing hydroxyapatite paste to 3D-printed plastic form. The purpose of our qualitative study was to evaluate the regenerative potential of the innovative ceramic biomaterial prepared using this method in the therapy of the cortical bone of the lower jaw in four mature pigs. The mandible bone defects were evaluated after different periods of time (after 3, 4, 5 and 6 months) and compared with the control sample (healthy cortical bone from the opposite side of the mandible). The results of the morphological, clinical and radiological investigation and hardness examination confirmed the positive regenerative potential of ceramic implants after treatment of the mandible bone defects in the porcine mandible model.
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Berges AJ, Lina IA, Ospino R, Tsai HW, Ding D, Izzi JM, Hillel AT. Impact of Low-Volume, Low-Pressure Tracheostomy Cuffs on Acute Mucosal Injury in Swine. Otolaryngol Head Neck Surg 2022; 167:716-724. [PMID: 35998065 PMCID: PMC9891736 DOI: 10.1177/01945998221119160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Accepted: 03/02/2022] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Tapered low-volume, low-pressure (LVLP) cuffs have been introduced to improve sealing and reduce injury from tracheostomy and endotracheal intubation compared to traditional cylindrical high-volume, low-pressure (HVLP) cuffs. The objective of this study is to develop a swine model of tracheostomy injury and to compare live tissue response following LVLP and HVLP tracheostomy placement. STUDY DESIGN In vivo animal study. SETTING Academic institution. METHODS Swine underwent tracheostomy followed by placement of LVLP and HVLP tracheostomy cuffs at 30 cm H2O. After 24 and 48 hours, tracheal specimens underwent histopathological analysis including cilia, lamina propria and epithelial thickness, and mucosal injury score. RESULTS In all cuff contact areas, mean epithelial thickness for both tracheostomy cohorts was decreased compared to control epithelium at 24 and 48 hours (P < .01). HVLP proximal epithelium thickness was decreased at 24 and 48 hours relative to LVLP sections (P < .05). Lamina propria thickness in proximal LVLP sections was less than HVLP sections at 24 hours and 48 hours (P < .05). Mucosal injury score at areas of cuff contact was increased in tracheostomy cohorts relative to controls (P < .001), with HVLP injury score greater than LVLP at the proximal cuff (P < .05). CONCLUSION In a swine model, tracheostomy resulted in increased mucosal injury compared to normal tracheal mucosa. LVLP cuffs resulted in less injury than HVLP cuffs, with reduced mucosal inflammation and improved health of epithelium and lamina propria. The wider proximal LVLP cuff demonstrated improved mucosal health compared to the HVLP cylindrical cuff.
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Affiliation(s)
- Alexandra J. Berges
- Department of Otolaryngology–Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
| | - Ioan A. Lina
- Department of Otolaryngology–Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
| | - Rafael Ospino
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Hsiu-Wen Tsai
- Department of Otolaryngology–Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
| | - Dacheng Ding
- Department of Otolaryngology–Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
| | - Jessica M. Izzi
- Department of Molecular and Comparative Pathobiology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Alexander T. Hillel
- Department of Otolaryngology–Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
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3
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Abstract
A lack of reliable laryngeal thermal injury models precludes laryngeal burn wound healing studies and investigation of novel therapeutics. We hypothesize that a swine laryngeal burn model can allow for laryngeal burn evaluation over time. Twelve Yorkshire crossbreed swine underwent tracheostomy and endoscopically directed laryngeal burns using heated air (150-160°C). Swine larynges were evaluated and sectioned/stained at 12 hours, 1, 3, 7, 14, and 21 days. A board-certified veterinary pathologist assessed anatomic regions (left and right: epiglottis, true/false vocal folds, and subglottis) using a nine criteria histological injury scoring scale. Six swine were euthanized at scheduled endpoints, three prematurely (airway concerns), and three succumbed to airway complications after 16 to 36 hours. Endoscopic and gross examination from scheduled endpoints revealed massive supraglottic edema and tissue damage, particularly around the arytenoids, extending transglottically. Swine from premature endpoints had comparatively increased edema throughout. Microscopic evaluation documented an inverse relationship between injury severity score and time from injury. Inflammation severity decreased over time, nearly resolving by 14 days. Neutrophils predominated early with histiocytes appearing at 3 days. Granulation tissue appeared at 3 days, and early epiglottic and/or subglottic fibrosis appeared by 7 days and matured by 14 days. Edema, abundant initially, decreased by day 3 and resolved by day 7. This approach is the first to provide longitudinal analysis of laryngeal thermal injuries, reflecting some of the first temporal wound healing characteristic data in laryngeal thermal injuries and providing a platform for future therapeutic studies.
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Affiliation(s)
- Gregory R Dion
- Dental and Craniofacial Trauma Research Department, U.S. Army Institute of Surgical Research, JBSA Fort Sam Houston, Texas.,Department of Otolaryngology-Head and Neck Surgery, Brooke Army Medical Center, Fort Sam Houston, Texas
| | - Christian S Pingree
- Department of Otolaryngology-Head and Neck Surgery, Brooke Army Medical Center, Fort Sam Houston, Texas
| | - Pedro J Rico
- Clinical Investigation and Research Support, 59th Medical Wing, United States Air Force, JBSA-Lackland, Texas
| | - Christine L Christensen
- Clinical Investigation and Research Support, 59th Medical Wing, United States Air Force, JBSA-Lackland, Texas
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4
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Clutton RE. A review of factors affecting analgesic selection in large animals undergoing translational research. Vet J 2018; 236:12-22. [PMID: 29871744 DOI: 10.1016/j.tvjl.2018.04.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Revised: 04/03/2018] [Accepted: 04/10/2018] [Indexed: 11/29/2022]
Abstract
The widespread physiological effects of pain in experimental animals are likely to reduce the validity of data except when pain itself is studied. Appropriately prescribed analgesics will limit pain and improve the welfare of animals undergoing noxious experimental procedures. However, their injudicious use may also introduce variability in data and limit study reproducibility. Optimizing both animal welfare and the value of scientific data from experimental studies requires the ability to identify, quantify and treat animal pain by applying a knowledge of analgesic pharmacology that is sympathetic to study objectives. This review first examines the reasons for promoting analgesic use in translational animal research and, in focussing on pigs and small ruminants, then identifies factors that should be considered when devising analgesic plans.
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Affiliation(s)
- R E Clutton
- The Wellcome Trust Critical Care Laboratory for Large Animals, Roslin Institute, Easter Bush Veterinary Centre, Roslin, Midlothian EH25 9RG, United Kingdom.
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5
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Ison SH, Clutton RE, Di Giminiani P, Rutherford KMD. A Review of Pain Assessment in Pigs. Front Vet Sci 2016; 3:108. [PMID: 27965968 PMCID: PMC5124671 DOI: 10.3389/fvets.2016.00108] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 11/15/2016] [Indexed: 11/13/2022] Open
Abstract
There is a moral obligation to minimize pain in pigs used for human benefit. In livestock production, pigs experience pain caused by management procedures, e.g., castration and tail docking, injuries from fighting or poor housing conditions, “management diseases” like mastitis or streptococcal meningitis, and at parturition. Pigs used in biomedical research undergo procedures that are regarded as painful in humans, but do not receive similar levels of analgesia, and pet pigs also experience potentially painful conditions. In all contexts, accurate pain assessment is a prerequisite in (a) the estimation of the welfare consequences of noxious interventions and (b) the development of more effective pain mitigation strategies. This narrative review identifies the sources of pain in pigs, discusses the various assessment measures currently available, and proposes directions for future investigation.
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Affiliation(s)
- Sarah H Ison
- Animal Behaviour and Welfare, Animal and Veterinary Sciences, Scotland's Rural College (SRUC), Edinburgh, UK; Easter Bush Veterinary Centre, Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Midlothian, UK
| | - R Eddie Clutton
- Easter Bush Veterinary Centre, Royal (Dick) School of Veterinary Studies, The University of Edinburgh , Midlothian , UK
| | - Pierpaolo Di Giminiani
- Food and Rural Development, School of Agriculture, Newcastle University , Newcastle upon Tyne , UK
| | - Kenneth M D Rutherford
- Animal Behaviour and Welfare, Animal and Veterinary Sciences, Scotland's Rural College (SRUC) , Edinburgh , UK
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6
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Hoffman B, Martin M, Brown BN, Bonassar LJ, Cheetham J. Biomechanical and biochemical characterization of porcine tracheal cartilage. Laryngoscope 2016; 126:E325-31. [DOI: 10.1002/lary.25861] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 12/11/2015] [Accepted: 12/15/2015] [Indexed: 11/05/2022]
Affiliation(s)
- Benjamin Hoffman
- Department of Clinical Sciences; College of Veterinary Medicine, Cornell University; Ithaca New York
| | - Matthew Martin
- Department of Clinical Sciences; College of Veterinary Medicine, Cornell University; Ithaca New York
| | - Bryan N. Brown
- Department of Clinical Sciences; College of Veterinary Medicine, Cornell University; Ithaca New York
- McGowan Institute for Regenerative Medicine, University of Pittsburgh; Pittsburgh Pennsylvania U.S.A
| | | | - Jonathan Cheetham
- Department of Clinical Sciences; College of Veterinary Medicine, Cornell University; Ithaca New York
- McGowan Institute for Regenerative Medicine, University of Pittsburgh; Pittsburgh Pennsylvania U.S.A
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7
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Cheetham J, Perkins JD, Jarvis JC, Cercone M, Maw M, Hermanson JW, Mitchell LM, Piercy RJ, Ducharme NG. Effects of Functional Electrical Stimulation on Denervated Laryngeal Muscle in a Large Animal Model. Artif Organs 2015; 39:876-85. [DOI: 10.1111/aor.12624] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jon Cheetham
- Department of Clinical Sciences; College of Veterinary Medicine; Cornell University; Ithaca NY USA
| | - Justin D. Perkins
- Comparative Neuromuscular Disease Laboratory; Royal Veterinary College; London
| | | | - Marta Cercone
- Department of Clinical Sciences; College of Veterinary Medicine; Cornell University; Ithaca NY USA
| | | | - John W. Hermanson
- Department of Biomedical Sciences; College of Veterinary Medicine; Cornell University; Ithaca NY USA
| | - Lisa M. Mitchell
- Department of Clinical Sciences; College of Veterinary Medicine; Cornell University; Ithaca NY USA
| | - Richard J. Piercy
- Comparative Neuromuscular Disease Laboratory; Royal Veterinary College; London
| | - Norm G. Ducharme
- Department of Clinical Sciences; College of Veterinary Medicine; Cornell University; Ithaca NY USA
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8
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Bradbury AG, Eddleston M, Clutton RE. Pain management in pigs undergoing experimental surgery; a literature review (2012-4). Br J Anaesth 2015; 116:37-45. [PMID: 26433866 DOI: 10.1093/bja/aev301] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Failure to provide effective analgesia to animals in noxious studies contravenes the obligation to refine animal experimentation and, by increasing 'noise' in physiological data sets, may decrease the scientific validity of results. Pig models of surgical conditions are becoming increasingly important and used for translational work. This review aimed to determine the extent to which the recent biomedical literature describes pain assessment and alleviation in pigs recovering from experimental surgery. Three databases (Medline, Web of Knowledge, and Google Scholar) were searched to find relevant studies published from January 2012 to March 2014. Information on pain assessment and peri- and postoperative analgesia was extracted. The review identified 233 papers meeting selection criteria. Most articles (193/233, 83%) described use of drugs with analgesic properties, but only 87/233 (37%) described postoperative analgesia. No article provided justification for the analgesic chosen, despite the lack of guidelines for analgesia in porcine surgical models and the lack of formal studies on this subject. Postoperative pain assessment was reported in only 23/233 (10%) articles. It was found that the reporting of postoperative pain management in the studies was remarkably low, reflecting either under-reporting or under-use. Analgesic description, when given, was frequently too limited to enable reproducibility. Development of a pain-scoring system in pigs, together with the mandatory description of pain management in submitted articles, would contribute to improved laboratory pig welfare.
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Affiliation(s)
- A G Bradbury
- The Wellcome Trust Critical Care Laboratory for Large Animals, Roslin Institute, University of Edinburgh, Easter Bush, Midlothian EH25 9RG, UK
| | - M Eddleston
- The Wellcome Trust Critical Care Laboratory for Large Animals, Roslin Institute, University of Edinburgh, Easter Bush, Midlothian EH25 9RG, UK Clinical Pharmacology, Cardiovascular Sciences, Queens Medical Research Institute, University of Edinburgh, 47 Little France Crescent, Edinburgh EH16 4TJ, UK
| | - R E Clutton
- The Wellcome Trust Critical Care Laboratory for Large Animals, Roslin Institute, University of Edinburgh, Easter Bush, Midlothian EH25 9RG, UK
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9
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Lange P, Greco K, Partington L, Carvalho C, Oliani S, Birchall MA, Sibbons PD, Lowdell MW, Ansari T. Pilot study of a novel vacuum-assisted method for decellularization of tracheae for clinical tissue engineering applications. J Tissue Eng Regen Med 2015; 11:800-811. [PMID: 25689270 DOI: 10.1002/term.1979] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 10/07/2014] [Accepted: 11/07/2014] [Indexed: 12/18/2022]
Abstract
Tissue engineered tracheae have been successfully implanted to treat a small number of patients on compassionate grounds. The treatment has not become mainstream due to the time taken to produce the scaffold and the resultant financial costs. We have developed a method for decellularization (DC) based on vacuum technology, which when combined with an enzyme/detergent protocol significantly reduces the time required to create clinically suitable scaffolds. We have applied this technology to prepare porcine tracheal scaffolds and compared the results to scaffolds produced under normal atmospheric pressures. The principal outcome measures were the reduction in time (9 days to prepare the scaffold) followed by a reduction in residual DNA levels (DC no-vac: 137.8±48.82 ng/mg vs. DC vac 36.83±18.45 ng/mg, p<0.05.). Our approach did not impact on the collagen or glycosaminoglycan content or on the biomechanical properties of the scaffolds. We applied the vacuum technology to human tracheae, which, when implanted in vivo showed no significant adverse immunological response. The addition of a vacuum to a conventional decellularization protocol significantly reduces production time, whilst providing a suitable scaffold. This increases clinical utility and lowers production costs. To our knowledge this is the first time that vacuum assisted decellularization has been explored. Copyright © 2015 John Wiley & Sons, Ltd.
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Affiliation(s)
- P Lange
- Department of Surgical Research, NPIMR, Watford Rd, Harrow, UK.,Department of Haematology, UCL, Medical School, London, UK
| | - K Greco
- Department of Surgical Research, NPIMR, Watford Rd, Harrow, UK
| | - L Partington
- Department of Haematology, UCL, Medical School, London, UK
| | - C Carvalho
- Department of Haematology, UCL, Medical School, London, UK
| | - S Oliani
- Immunomorphology Laboratory, Department of Biology, IBILCE-UNESP, São José do Rio Preto, Brazil
| | - M A Birchall
- UCL Ear Institute, Royal National Throat Nose and Ear Hospital, London, UK
| | - P D Sibbons
- Department of Surgical Research, NPIMR, Watford Rd, Harrow, UK
| | - M W Lowdell
- Department of Haematology, UCL, Medical School, London, UK
| | - T Ansari
- Department of Surgical Research, NPIMR, Watford Rd, Harrow, UK
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10
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Gigliuto C, De Gregori M, Malafoglia V, Raffaeli W, Compagnone C, Visai L, Petrini P, Avanzini MA, Muscoli C, Viganò J, Calabrese F, Dominioni T, Allegri M, Cobianchi L. Pain assessment in animal models: do we need further studies? J Pain Res 2014; 7:227-36. [PMID: 24855386 PMCID: PMC4020878 DOI: 10.2147/jpr.s59161] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
In the last two decades, animal models have become important tools in understanding and treating pain, and in predicting analgesic efficacy. Although rodent models retain a dominant role in the study of pain mechanisms, large animal models may predict human biology and pharmacology in certain pain conditions more accurately. Taking into consideration the anatomical and physiological characteristics common to man and pigs (median body size, digestive apparatus, number, size, distribution and communication of vessels in dermal skin, epidermal-dermal junctions, the immunoreactivity of peptide nerve fibers, distribution of nociceptive and non-nociceptive fiber classes, and changes in axonal excitability), swines seem to provide the most suitable animal model for pain assessment. Locomotor function, clinical signs, and measurements (respiratory rate, heart rate, blood pressure, temperature, electromyography), behavior (bright/quiet, alert, responsive, depressed, unresponsive), plasma concentration of substance P and cortisol, vocalization, lameness, and axon reflex vasodilatation by laser Doppler imaging have been used to assess pain, but none of these evaluations have proved entirely satisfactory. It is necessary to identify new methods for evaluating pain in large animals (particularly pigs), because of their similarities to humans. This could lead to improved assessment of pain and improved analgesic treatment for both humans and laboratory animals.
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Affiliation(s)
- Carmelo Gigliuto
- Anaesthesia and Intensive Care, University of Pavia, Pavia, Italy
| | | | | | - William Raffaeli
- ISAL Foundation, Institute for Research on Pain, Torre Pedrera, Rimini, Italy
| | - Christian Compagnone
- Department of Anaesthesia, Intensive Care and Pain Therapy, Azienda Ospedaliera Universitaria Parma, University of Parma, Parma, Italy
| | - Livia Visai
- Department of Molecular Medicine, Center for Tissue Engineering (CIT), INSTM UdR of Pavia, University of Pavia, Pavia, Italy ; Department of Occupational Medicine, Ergonomy and Disability, Laboratory of Nanotechnology, Salvatore Maugeri Foundation, IRCCS, Veruno, Italy
| | - Paola Petrini
- Dipartimento di Chimica, Materiali e Ingegneria Chimica 'G Natta' and Unità di Ricerca Consorzio INSTM, Politecnico di Milano, Milan, Italy
| | - Maria Antonietta Avanzini
- Laboratory of Transplant Immunology/Cell Factory, Fondazione IRCCS Policlinico "San Matteo", Pavia, Italy
| | - Carolina Muscoli
- Department of Health Science, University Magna Grecia of Catanzaro and Centro del Farmaco, IRCCS San Raffaele Pisana, Roma, Italy
| | - Jacopo Viganò
- University of Pavia, Department of Surgical, Clinical, Paediatric and Diagnostic Science, General Surgery 1, IRCCS Fondazione Policlinico San Matteo, Pavia, Italy
| | - Francesco Calabrese
- University of Pavia, Department of Surgical, Clinical, Paediatric and Diagnostic Science, General Surgery 1, IRCCS Fondazione Policlinico San Matteo, Pavia, Italy
| | - Tommaso Dominioni
- University of Pavia, Department of Surgical, Clinical, Paediatric and Diagnostic Science, General Surgery 1, IRCCS Fondazione Policlinico San Matteo, Pavia, Italy
| | - Massimo Allegri
- Pain Therapy Service, Fondazione IRCCS Policlinico San Matteo, Pavia ; Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy
| | - Lorenzo Cobianchi
- University of Pavia, Department of Surgical, Clinical, Paediatric and Diagnostic Science, General Surgery 1, IRCCS Fondazione Policlinico San Matteo, Pavia, Italy
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11
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Markwardt J, Sembdner P, Lesche R, Jung R, Spekl K, Mai R, Schulz M, Reitemeier B. Experimental findings on customized mandibular implants in Göttingen minipigs – A pilot study. Int J Surg 2014; 12:60-6. [DOI: 10.1016/j.ijsu.2013.10.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 10/13/2013] [Accepted: 10/24/2013] [Indexed: 11/28/2022]
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12
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Jones A, Bienemann A, Barua N, Murison PJ, Gill S. Anaesthetic complications in pigs undergoing MRI guided convection enhanced drug delivery to the brain: a case series. Vet Anaesth Analg 2012; 39:647-52. [DOI: 10.1111/j.1467-2995.2012.00767.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Birchall MA, Ayling SM, Harley R, Murison PJ, Burt R, Mitchard L, Jones A, Macchiarini P, Stokes CR, Bailey M. Laryngeal transplantation in minipigs: early immunological outcomes. Clin Exp Immunol 2012; 167:556-64. [PMID: 22288599 DOI: 10.1111/j.1365-2249.2011.04531.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Despite recent tissue-engineering advances, there is no effective way of replacing all the functions of the larynx in those requiring laryngectomy. A recent clinical transplant was a success. Using quantitative immunofluorescence targeted at immunologically relevant molecules, we have studied the early (48 h and 1 week) immunological responses within larynxes transplantated between seven pairs of National Institutes of Health (NIH) minipigs fully homozygous at the major histocompatibility complex (MHC) locus. There were only small changes in expression of some molecules (relative to interindividual variation) and these were clearest in samples from the subglottic region, where the areas of co-expression of CD25(+) CD45RC(-) CD8(-) and of CD163(+) CD172(+) MHC-II(-) increased at 1 week after transplant. In one case, infiltration by recipient T cells was analysed by T cell receptor (TCR) Vβ spectratype analysis; this suggested that changes in the T cell repertoire occur in the donor subglottis mucosal tissues from day 0 to day 7, but that the donor and recipient mucosal Vβ repertoires remain distinct. The observed lack of strong immunological responses to the trauma of surgery and ischaemia provides encouraging evidence to support clinical trials of laryngeal transplantation, and a basis on which to interpret future studies involving mismatches.
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Affiliation(s)
- M A Birchall
- Department of Clinical Sciences at South Bristol, University of Bristol, Bristol, UK.
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14
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Nicholls SM, Mitchard LK, Murrell JC, Dick AD, Bailey M. Perioperative socialization, care and monitoring of National Institutes of Health miniature swine undergoing ocular surgery and sampling of peripheral blood. Lab Anim 2011; 46:59-64. [PMID: 22056891 DOI: 10.1258/la.2011.011026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Swine are a frequent species of choice for testing new surgical procedures and for transplantation studies. However, information concerning best practice to prepare pigs for surgery and postoperative treatment and monitoring is limited, despite a perception that preoperative socialization is beneficial. Therefore we examined the effect of preoperative visits by project personnel on compliance of 26 National Institutes of Health (NIH) minipigs subject to corneal transplantation. We briefly describe sedation and anaesthesia protocols developed for surgery and multiple postoperative interventions in order to facilitate interpretation of data relating to pig compliance. Preoperative visit variables and measures of preoperative socialization were correlated with postoperative outcome. Principal component analysis (PCA) of postoperative outcome variables identified a factor accounting for 53.5% of the variance that was significantly associated with two factors derived from PCA of preoperative factors (accounting, respectively, for 54.7% and 26.0% of the variance; P = 0.019 for the overall model, P = 0.041 and 0.040 for factors 1 and 2, respectively), such that more time spent with pigs before surgery and higher socialization scores were associated with less postoperative stress and difficulty of eye medication. Moreover, two of the preoperative visit variables, time spent with only one person in the pen and time spent with two or more people in the pen, contributed predominantly to PCA factors 1 and 2, respectively, indicating that they were fulfilling two qualitatively different requirements for socialization. We conclude that NIH minipigs are fully compliant with anaesthetic and postoperative experimental procedures provided they are well-socialized to project personnel before surgery.
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Affiliation(s)
- S M Nicholls
- Unit of Ophthalmology, School of Clinical Sciences, University of Bristol, Bristol BS8 1TD, UK.
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15
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Birchall MA, Kingham PJ, Murison PJ, Ayling SM, Burt R, Mitchard L, Jones A, Lear P, Stokes CR, Terenghi G, Bailey M, Macchiarini P. Laryngeal transplantation in minipigs: vascular, myologic and functional outcomes. Eur Arch Otorhinolaryngol 2011; 268:405-14. [PMID: 20842506 PMCID: PMC3192951 DOI: 10.1007/s00405-010-1355-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2010] [Accepted: 07/25/2010] [Indexed: 12/01/2022]
Abstract
There is no effective way of replacing all the functions of the larynx in those requiring laryngectomy. Regenerative medicine offers promise, but cannot presently deliver implants with functioning neuromuscular units. A single well-documented laryngeal transplant in man was a qualified success, but more information is required before clinical trials may be proposed. We studied the early response of the larynx to laryngeal transplantation between 17 pairs of NIH minipigs full matched at the MHC2 locus. Following iterative technical improvements, pigs had good swallowing and a patent airway at 1 week. No significant changes in mucosal blood flux were observed compared with pre-operative measurements. Changes in muscle morphology and fibre phenotype were observed in transplant muscles retrieved after 7 days: the levels of fast and slow myosin heavy chain (MyHC) protein were reduced and embryonic MyHC was up regulated consistent with denervation induced atrophy. At 1 week laryngeal transplantation can result in good swallowing, and is not associated with clinical evidence of ischemia-reperfusion injury in MHC-matched pigs.
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Affiliation(s)
- M A Birchall
- Department of Clinical Sciences at South Bristol, Bristol, UK.
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