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Guérillot R, Li L, Baines S, Howden B, Schultz MB, Seemann T, Monk I, Pidot SJ, Gao W, Giulieri S, Gonçalves da Silva A, D’Agata A, Tomita T, Peleg AY, Stinear TP, Howden BP. Comprehensive antibiotic-linked mutation assessment by resistance mutation sequencing (RM-seq). Genome Med 2018; 10:63. [PMID: 30165908 PMCID: PMC6117896 DOI: 10.1186/s13073-018-0572-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Accepted: 07/24/2018] [Indexed: 12/15/2022] Open
Abstract
Mutation acquisition is a major mechanism of bacterial antibiotic resistance that remains insufficiently characterised. Here we present RM-seq, a new amplicon-based deep sequencing workflow based on a molecular barcoding technique adapted from Low Error Amplicon sequencing (LEA-seq). RM-seq allows detection and functional assessment of mutational resistance at high throughput from mixed bacterial populations. The sensitive detection of very low-frequency resistant sub-populations permits characterisation of antibiotic-linked mutational repertoires in vitro and detection of rare resistant populations during infections. Accurate quantification of resistance mutations enables phenotypic screening of mutations conferring pleiotropic phenotypes such as in vivo persistence, collateral sensitivity or cross-resistance. RM-seq will facilitate comprehensive detection, characterisation and surveillance of resistant bacterial populations ( https://github.com/rguerillot/RM-seq ).
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Affiliation(s)
- Romain Guérillot
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Lucy Li
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Sarah Baines
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Brian Howden
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Mark B. Schultz
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
- Doherty Applied Microbial Genomics, The University of Melbourne at the Peter Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
- Microbiological Diagnostic Unit Public Health Laboratory, The University of Melbourne at the Peter Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Torsten Seemann
- Doherty Applied Microbial Genomics, The University of Melbourne at the Peter Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
- Melbourne Bioinformatics, The University of Melbourne, Melbourne, Victoria Australia
| | - Ian Monk
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Sacha J. Pidot
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Wei Gao
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Stefano Giulieri
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Anders Gonçalves da Silva
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
- Doherty Applied Microbial Genomics, The University of Melbourne at the Peter Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
- Microbiological Diagnostic Unit Public Health Laboratory, The University of Melbourne at the Peter Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Anthony D’Agata
- Microbiological Diagnostic Unit Public Health Laboratory, The University of Melbourne at the Peter Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Takehiro Tomita
- Microbiological Diagnostic Unit Public Health Laboratory, The University of Melbourne at the Peter Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Anton Y. Peleg
- Department of Infectious Diseases, The Alfred Hospital and Central Clinical School, Monash University, Melbourne, Victoria Australia
- Infection and Immunity Theme, Monash Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Victoria Australia
| | - Timothy P. Stinear
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
- Doherty Applied Microbial Genomics, The University of Melbourne at the Peter Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
| | - Benjamin P. Howden
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
- Doherty Applied Microbial Genomics, The University of Melbourne at the Peter Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
- Microbiological Diagnostic Unit Public Health Laboratory, The University of Melbourne at the Peter Doherty Institute for Infection & Immunity, Melbourne, Victoria Australia
- Infectious Diseases Department, Austin Health, Heidelberg, Victoria Australia
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Cameron DR, Lin YH, Trouillet-Assant S, Tafani V, Kostoulias X, Mouhtouris E, Skinner N, Visvanathan K, Baines SL, Howden B, Monk IR, Laurent F, Stinear TP, Howden BP, Peleg AY. Vancomycin-intermediate Staphylococcus aureus isolates are attenuated for virulence when compared with susceptible progenitors. Clin Microbiol Infect 2017; 23:767-773. [PMID: 28396035 DOI: 10.1016/j.cmi.2017.03.027] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [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: 10/26/2016] [Revised: 03/29/2017] [Accepted: 03/30/2017] [Indexed: 11/26/2022]
Abstract
OBJECTIVES Vancomycin-intermediate Staphylococcus aureus (VISA) is associated with genetic changes that may also impact upon pathogenicity. In the current study, we compared the virulence of clinical VISA strains with their isogenic vancomycin-susceptible progenitors (VSSA). METHODS Production of the critical virulence protein, α toxin, was assessed using Western blot analysis and was correlated to agr activity using a bioluminescent agr-reporter. Cytotoxicity and intracellular persistence were compared ex vivo for VSSA and VISA within non-professional phagocytes (NPP). Virulence and host immune responses were further explored in vivo using a murine model of bacteraemia. RESULTS VISA isolates produced up to 20-fold less α toxin compared with VSSA, and this was corroborated by either loss of agr activity due to agr mutation, or altered agr activity in the absence of mutation. VISA were less cytotoxic towards NPP and were associated with enhanced intracellular persistence, suggesting that NPP may act as a reservoir for VISA. Infection with VSSA strains produced higher mortality in a murine bacteraemia model (≥90% 7-day mortality) compared with infection with VISA isolates (20% to 50%, p <0.001). Mice infected with VISA produced a dampened immune response (4.6-fold reduction in interleukin-6, p <0.001) and persistent organ bacterial growth was observed for VISA strains out to 7 days. CONCLUSIONS These findings highlight the remarkable adaptability of S. aureus, whereby, in addition to having reduced antibiotic susceptibility, VISA alter the expression of pathogenic factors to circumvent the host immune response to favour persistent infection over acute virulence.
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Affiliation(s)
- D R Cameron
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Australia
| | - Y-H Lin
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute of Infection & Immunity, Australia
| | - S Trouillet-Assant
- Department of Microbiology, French National Reference Centre for Staphylococci, Hospices Civils de Lyon, International Centre of Infectiology Research, France
| | - V Tafani
- Department of Microbiology, French National Reference Centre for Staphylococci, Hospices Civils de Lyon, International Centre of Infectiology Research, France
| | - X Kostoulias
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Australia
| | - E Mouhtouris
- Department of Surgery, The University of Melbourne, Australia
| | - N Skinner
- Department of Medicine, The University of Melbourne, Australia
| | - K Visvanathan
- Department of Medicine, The University of Melbourne, Australia
| | - S L Baines
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute of Infection & Immunity, Australia
| | - B Howden
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute of Infection & Immunity, Australia
| | - I R Monk
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute of Infection & Immunity, Australia
| | - F Laurent
- Department of Microbiology, French National Reference Centre for Staphylococci, Hospices Civils de Lyon, International Centre of Infectiology Research, France
| | - T P Stinear
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute of Infection & Immunity, Australia
| | - B P Howden
- Department of Microbiology and Immunology, The University of Melbourne at the Doherty Institute of Infection & Immunity, Australia; Infectious Diseases and Microbiology Departments, Austin Health, Australia.
| | - A Y Peleg
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Australia; Department of Infectious Diseases, The Alfred Hospital and Central Clinical School, Monash University, Australia.
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3
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Wallace JR, Mangas KM, Porter JL, Marcsisin R, Pidot SJ, Howden B, Omansen TF, Zeng W, Axford JK, Johnson PDR, Stinear TP. Mycobacterium ulcerans low infectious dose and mechanical transmission support insect bites and puncturing injuries in the spread of Buruli ulcer. PLoS Negl Trop Dis 2017; 11:e0005553. [PMID: 28410412 PMCID: PMC5406025 DOI: 10.1371/journal.pntd.0005553] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 04/26/2017] [Accepted: 04/04/2017] [Indexed: 11/18/2022] Open
Abstract
Addressing the transmission enigma of the neglected disease Buruli ulcer (BU) is a World Health Organization priority. In Australia, we have observed an association between mosquitoes harboring the causative agent, Mycobacterium ulcerans, and BU. Here we tested a contaminated skin model of BU transmission by dipping the tails from healthy mice in cultures of the causative agent, Mycobacterium ulcerans. Tails were exposed to mosquito (Aedes notoscriptus and Aedes aegypti) blood feeding or punctured with sterile needles. Two of 12 of mice with M. ulcerans contaminated tails exposed to feeding A. notoscriptus mosquitoes developed BU. There were no mice exposed to A. aegypti that developed BU. Eighty-eight percent of mice (21/24) subjected to contaminated tail needle puncture developed BU. Mouse tails coated only in bacteria did not develop disease. A median incubation time of 12 weeks, consistent with data from human infections, was noted. We then specifically tested the M. ulcerans infectious dose-50 (ID50) in this contaminated skin surface infection model with needle puncture and observed an ID50 of 2.6 colony-forming units. We have uncovered a biologically plausible mechanical transmission mode of BU via natural or anthropogenic skin punctures.
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Affiliation(s)
- John R. Wallace
- Department of Biology, Millersville University, Millersville, PA, United States of America
| | - Kirstie M. Mangas
- Department of Microbiology and Immunology, at the Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
| | - Jessica L. Porter
- Department of Microbiology and Immunology, at the Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
| | - Renee Marcsisin
- Department of Microbiology and Immunology, at the Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
| | - Sacha J. Pidot
- Department of Microbiology and Immunology, at the Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
| | - Brian Howden
- Department of Microbiology and Immunology, at the Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
| | - Till F. Omansen
- Department of Microbiology and Immunology, at the Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
- Department of Internal Medicine, University of Groningen, Groningen, RB, The Netherlands
| | - Weiguang Zeng
- Department of Microbiology and Immunology, at the Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
| | - Jason K. Axford
- Pest and Environmental Adaptation Research Group, Bio21 Institute and School of BioSciences, University of Melbourne, Parkville, Vic, Australia
| | - Paul D. R. Johnson
- Department of Infectious Diseases, Austin Health, Heidelberg, Victoria, Australia
| | - Timothy P. Stinear
- Department of Microbiology and Immunology, at the Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
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Hu M, Watson D, Zhang GY, Graf N, Wang YM, Sartor M, Howden B, Fletcher J, Alexander SI. Long-Term Cardiac Allograft Survival across an MHC Mismatch after “Pruning” of Alloreactive CD4 T Cells. J Immunol 2008; 180:6593-603. [DOI: 10.4049/jimmunol.180.10.6593] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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5
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Bartlett ASR, McCall JL, Ameratunga R, Howden B, Ramadas R, Yeong ML, Benjamin CD, Hess D, Munn SR. Intragraft gene and protein expression in rat liver allografts treated with costimulatory blockade alone or in combination with CyA. J Surg Res 2003; 115:1-8. [PMID: 14572766 DOI: 10.1016/s0022-4804(03)00131-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Costimulatory blockade has been shown to prevent acute rejection (AR) and promote long-term graft survival in a number of animal models including nonhuman primates. The effect of concomitant administration of conventional immunosuppressives on long-term liver allograft survival and intragraft expression of immune mediators has not previously been examined. MATERIALS AND METHODS A high-responding Dark Agouti to Lewis orthotopic liver transplant (LEW OLT) model was used to compare anti-CD154 alone, or in combination with cyclosporin (CyA) on allograft survival. Donor-specific reactivity was assessed by mixed lymphocyte reaction (MLR) and allogeneic skin grafts. Surviving rats were euthanized on day 150 and intragraft gene (CD80, 86, 152, 154, IFN-gamma, IL-2, IL-6, IL-10, IL-13, TNF-alpha, TGF-beta, IL-7, Fas-ligand, Granzyme B, bax, and bcl(2)) and protein (CD4, CD8, ED1, CD154, CD80, CD86) expression was measured. RESULTS Untreated control recipients had a median survival time of 5 days. Recipients treated with anti-CD154 survived to beyond 150 days with no evidence of AR. Concomitant administration of CyA did not alter the long-term survival. There was no difference in the serum aspartate aminotransferase between treatment groups or a change over time. All treated recipients showed a reduction in donor-specific MLR at day 40 and 60 but had persistence of donor reactivity to skin grafts at day 100. Histologically, liver architecture was well preserved despite the presence of a nondestructive mononuclear cell infiltrate. Analysis of intragraft gene expression revealed an inverse relationship between the duration of anti-CD154 therapy and the gene expression of costimulatory molecules and Th1 cytokine transcripts. The pro-apoptotic gene, bax, was increased in recipients treated with anti-CD154, but not CyA, compared with normal liver. CONCLUSIONS These data demonstrate that anti-CD154 therapy either alone or in combination with CyA allows for the long-term survival of liver allografts in the rat despite there being a difference in the intragraft gene and protein profile.
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Affiliation(s)
- Adam S R Bartlett
- Department of Surgery, University of Auckland, Auckland, New Zealand
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6
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Bartlett AS, McCall JL, Ameratunga R, Howden B, Yeong ML, Benjamin CD, Hess D, Peach R, Munn SR. Costimulatory blockade prevents early rejection, promotes lymphocyte apoptosis, and inhibits the upregulation of intragraft interleukin-6 in an orthotopic liver transplant model in the rat. Liver Transpl 2002; 8:458-68. [PMID: 12004346 DOI: 10.1053/jlts.2002.32979] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Costimulatory pathways have a pivotal role in the T-cell response to alloantigen. The role of costimulatory blockade with anti-CD154 in orthotopic liver transplantation (OLT) has not been examined previously. This study aims to investigate effects of anti-CD154 and CTLA4-immunoglobulin (Ig) in the early post-OLT period using a major histocompatibility complex-disparate fully arterialized OLT model in the rat. Lewis rats underwent OLT with Dark Agouti liver allografts. Recipients were randomized to receive (1) isotype control, (2) anti-CD154, (3) CTLA4-Ig, or (4) cyclosporine A (CyA). Rats were killed day 8, and specimens were obtained for histological examination, terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick end labeling, immunohistochemistry, and quantitative reverse-transcriptase polymerase chain reaction. An additional five transplant recipients were treated with anti-CD154 for 14 days postoperatively to assess long-term allograft survival. All isotype control animals died on or before day 6 of acute rejection. Apart from four deaths caused by nonimmunologic causes, all treated recipients survived to day 8. The median survival of rats treated for 14 days with anti-CD154 was greater than 150 days. Serum aspartate aminotransferase and bilirubin levels normalized by day 3 in the CyA group and day 5 in transplant recipients treated with costimulatory blockade. Histologically, there was no difference between isotype controls and CTLA4-Ig-treated animals, whereas anti-CD154-treated transplant recipients had a lower Banff score. CD4+ and CD8+ T-cell infiltrates were prominent in transplant recipients treated with costimulatory blockade. Intragraft analysis showed an increase in lymphocyte apoptosis, Fas ligand messenger RNA expression, and reduction in interleukin-6 gene expression in transplant recipients treated with costimulatory blockade. Costimulatory blockade did not alter intragraft gene expression of other mediators of T-cell priming, differentiation, and effector function compared with isotype control animals. In conclusion, costimulatory blockade prevented acute rejection, enabled long-term survival, and increased intragraft lymphocyte apoptosis in a high-responding rat OLT model.
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Eppel GA, Osicka TM, Pratt LM, Jablonski P, Howden B, Glasgow EF, Comper WD. The return of glomerular filtered albumin to the rat renal vein--the albumin retrieval pathway. Ren Fail 2001; 23:347-63. [PMID: 11499551 DOI: 10.1081/jdi-100104719] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND Recent studies have demonstrated that the normal glomerular capillary wall (GCW) is not charge selective to albumin. This means that albumin flux across the GCW is high. This has been confirmed in studies where albumin uptake by the tubules has been inhibited. Therefore, there must be a high capacity postglomerular retrieval pathway in normal kidneys that returns filtered albumin back to the blood supply. METHODS This study identifies the presence of glomerular filtered albumin in the renal vein from the analysis of the decrease of radioactivity in the venous effluent after the injection of a pulse of tritium labeled albumin into the renal artery in vivo and in the isolated perfused kidney (IPK). RESULTS The glomerular filtered albumin is returned to the blood supply by a high capacity pathway that transports this albumin at a rate of 1830+/-292 microg/min rat kidney (n= 14) (mean+/-SEM). This pathway has been identified under physiological conditions in vivo and in the IPK. The pathway is specific for albumin as it does not occur for horseradish peroxidase (HRP). The pathway is inhibited in a non-filtering kidney. The pathway is also inhibited by NH4Cl, an inhibitor of protein uptake. CONCLUSIONS The high capacity retrieval pathway for albumin is most likely associated with transtubular cell transport. It is also apparent that most albuminuric states could be accounted for by the malfunctioning of this pathway without resorting to any change in glomerular permselectivity.
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Affiliation(s)
- G A Eppel
- Department of Biochemistry, Monash University, Clayton, Victoria, Australia
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8
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Baxter K, Howden B, Saunder A, Jablonski P. Improved cardiac preservation by the addition of nitroglycerine to colloid-free University of Wisconsin solution (MUW). J Heart Lung Transplant 1999; 18:769-74. [PMID: 10512523 DOI: 10.1016/s1053-2498(99)00005-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND This study examines whether the addition of nitroglycerine, a known coronary vasodilator and nitric oxide donor, to colloid-free University of Wisconsin solution will improve and extend cardiac preservation. METHODS Rat hearts were flushed and stored in colloid-free University of Wisconsin solution with or without the addition of nitroglycerine for 12, 16 or 20 hours at 0 degrees C before heterotopic transplantation with an indwelling externalized intraventricular balloon-tipped catheter. One and 7 days after transplantation of the heart the catheter was connected to a pressure transducer and quantitative functional studies were performed. RESULTS After 12 hours preservation with nitroglycerine in colloid-free University of Wisconsin solution 6/6 grafts continued to beat for 7 days compared to 3/6 without nitroglycerine. After 16 hours preservation the addition of nitroglycerine 5/7 hearts continued to beat for 7 days compared to 0/6 without nitroglycerine (p < .05). Only 1/6 hearts beat for 7 days after 20 hours preservation with nitroglycerine. On Days 1 and 7, the left ventricular developed pressure (LVDP), contractility (max dP/dt) and rate of relaxation (peak -dP/dt) of 12 hour preserved hearts was better (p < .05) when nitroglycerine was present. The function of hearts preserved with the addition of nitroglycerine was similar after 12 and 16 hours preservation. CONCLUSION Nitroglycerine is a valuable additive to colloid-free University of Wisconsin solution, extending effective preservation of the rat heart to 16 hours and significantly improving left ventricular function after 12 and 16 hours preservation. The addition of nitroglycerine, however, did not extend preservation to 20 hours.
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Affiliation(s)
- K Baxter
- Monash University, Department of Surgery, Monash Medical Centre, Melbourne, Australia.
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9
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Stein-Oakley AN, Jablonski P, Baxter K, Howden B, Tzanidis A, Marshall VC, Thomson NM. Chronic rejection of rat renal allografts: a novel subpopulation of infiltrating leukocytes in long-term surviving allografts. Transplant Proc 1993; 25:913-4. [PMID: 8442267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- A N Stein-Oakley
- Department of Nephrology, Monash Medical Centre, Victoria, Australia
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10
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Abstract
The hepatic artery is important in preventing biliary ischemia and obstruction after bile duct reconstruction or orthotopic liver transplantation in the rat. A technique of orthotopic liver transplantation in the rat with reestablishment of the arterial inflow is described, suitable for studies in immunology and preservation. Reestablishment of both venous and arterial inflow is required to minimize biliary complications. General survival, hepatic cellular function, and biliary drainage are all improved by rearterialization. In all these features, the rat illustrates characteristics applicable to human liver transplantation. The vital requirement of the adequacy of blood supply to the bile duct in liver transplantation surgery in all species is highlighted by these findings, which indicate clearly the importance of an arterial blood supply in rat liver transplantation and bile duct surgery.
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Affiliation(s)
- B Howden
- Monash University, Department of Surgery, Prince Henry's Hospital, Melbourne, Victoria, Australia
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11
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Thomson NM, Perks AG, Jablonski P, Howden B, Maguire J, Scott DF, Marshall VC. Induction of Ia in rat pancreas allografts: the effect of donor specific blood transfusion pretreatment or cyclosporin A. Transplant Proc 1989; 21:507-9. [PMID: 2468221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- N M Thomson
- Department of Nephrology, Monash University, Prince Henry's Hospital, Melbourne, Australia
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12
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Linsell M, Jablonski P, Howden B, Scott D, Marshall V. The thigh flap: an osteomyocutaneous free-flap model in the rat. Plast Reconstr Surg 1988; 81:240-5. [PMID: 3336656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A new experimental model for free-flap transfer has been developed in the rat. This "thigh flap" is an osteomyocutaneous free flap of bone (femur), muscle (thigh), and skin (groin) based on the femoral vessels. The flap is harvested from the left groin and thigh of an inbred female rat and is transferred to a subcutaneous pocket in the left groin of a male rat of the same inbred strain. The femoral vessels supplying the flap are anastomosed end-to-end with the femoral vessels of the recipient. Thirty flaps have been transferred, with 5 technical failures. Three of the remaining 25 flaps developed necrosis within 24 hours. The other 22 flaps remained viable until the rat was sacrificed at 7 days. The survival rate of the thigh flap was thus 88 percent. The model is suitable for use in metabolic, vascular, and immunologic studies of composite free flaps.
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Affiliation(s)
- M Linsell
- Monash University Department of Surgery, Prince Henry's Hospital, Melbourne, Australia
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13
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Howden B, Jablonski P, Biguzas M, Brook W, Marshall VC. Rat pancreas preservation for transplantation. Transplant Proc 1987; 19:1011-2. [PMID: 2484091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
This study has shown that phosphate-buffered sucrose is a suitable preserving solution for the cold storage of rat pancreata for 24 hours. Isotonic citrate does not appear to be as effective a preserving solution under these conditions. Preservation of endocrine function is evident, but preservation of exocrine function is effected by obstruction or occlusion of the ductocystostomy, which may occur some time after transplantation and may not be related to transplant conditions.
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Affiliation(s)
- B Howden
- Department of Surgery, Monash University, Prince Henry's Hospital, Melbourne, Australia
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14
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Lambert R, Carroll N, Henry M, Howden B, Jablonski P, Rae D, Tavanlis G, Marshall V, Tange J. Glomerular epithelial cell lesions in rat renal isografts. Pathology 1987; 19:31-7. [PMID: 3295711 DOI: 10.3109/00313028709065132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Visceral glomerular epithelial cell lesions--microvillus formation, loss of foot processes, osmiophilic inclusion droplets, balloon-like malformation of cell processes, degeneration, necrosis, and loss of cell processes from capillary basement membranes--are found in rat renal isografts 1 mth after transplantation. The lesions, which are most readily recognized in perfusion-fixed material, are essentially focal, affecting neither all glomeruli, nor all cells in any glomerulus, bear no relation to the degree of interstitial nephritis in the graft, and are associated with albuminuria and with focal capillary sclerosis in some glomeruli. They are not restricted to renal isografts but are found in aging rats, in different experimental models of glomerular disease and in clinical glomerular disorders, again in association with proteinuria and glomerulosclerosis. It is therefore proposed that glomerular epithelial cell damage increases capillary permeability and impairs maintenance of the integrity of the capillary wall, leading to proteinuria and focal glomerulosclerosis.
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15
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Abstract
Severe proteinuria occurs during isolated organ perfusion of kidneys removed from SD and DA rats and subjected to 24-hr cold preservation. In both strains increased glomerular permeability was associated with changes in glomerular visceral epithelial cells, particularly cytoplasmic edema and detachment of cells from capillary basement membranes. Foot processes were intact and staining for sialoglycoprotein was retained. The changes were compatible with survival of the isograft kidney after transplantation, but moderate proteinuria was found in some rats after one month. Protein loss in the urine during isolated organ perfusion is very much less in kidneys subjected to 4-hr cold preservation, and the glomerular epithelial cells are normal or show only minimal cytoplasmic edema on electron microscopy. The experiment shows that significant damage to glomeruli may occur during preservation prior to transplantation, and the model itself can be usefully exploited to determine the relation between increased glomerular permeability to albumin and the associated changes in the glomerular capillary wall.
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Abstract
The effects of cyclosporine (CsA) on renal function and morphology have been studied in the rat after unilateral nephrectomy and warm renal ischemia. There is evidence of an enhanced CsA nephrotoxic effect after unilateral nephrectomy alone and of an additive or synergistic effect of CsA and renal ischemia upon renal function and morphology. These enhanced effects are most evident after longer periods of ischemia (60 min) and with higher doses of CsA (25 mg/kg/day). The findings may be relevant to clinical practice and suggest that the nephrotoxic effects of CsA upon the donor kidney may be greatest when there is coincident renal damage from other causes.
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Jablonski P, Howden B, Marshall V. A new rat pancreas transplant model. Cryobiology 1985. [DOI: 10.1016/0011-2240(85)90096-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Jablonski P, Howden B, Rae D, Rigol G, Birrell C, Marshall V, Tange J. The influence of the contralateral kidney upon recovery from unilateral warm renal ischemia. Pathology 1985; 17:623-7. [PMID: 4094791 DOI: 10.3109/00313028509084764] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Unilateral warm renal ischemia of 90 min duration was induced in rats and the contralateral normal kidney was removed either immediately or after 1, 2, 4 or 14 d. Contralateral nephrectomy at 2, 4, 14 d increased survival and modified the functional and morphological events of the recovery period. Optimal recovery was obtained by 4 d delay. When contralateral nephrectomy was delayed by 14 d, scarring of the ischemic kidney was more severe suggesting that regeneration of damaged nephrons was impaired when renal homeostasis was sustained by the contralateral kidney. Such biphasic and inverse effects of normal kidney tissue are likely to be important determinants of the natural history of severe unilateral renal damage.
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Abstract
The renal effects of dopamine, the dopamine antagonist spiperone and the combination of dopamine and spiperone were examined in the isolated perfused rat kidney preparation. Studies were carried out at constant perfusion pressure and the following were measured at 10 min intervals for 1 h: perfusate flow; GFR (3H-inulin); urine flow rate; sodium, potassium and kallikrein excretion; perfusate renin concentration; perfusate and urinary-dopamine levels. Low-dose dopamine infusion (6 X 10(-10) mol/min) resulted in significant diuresis, natriuresis and kaluresis but little change in GFR. These effects were blocked by spiperone (10(-10) mol/min) which had no significant effects when infused alone. At a higher dose (10(-8) mol/min) dopamine significantly increased urine flow alone; this too was reversed by spiperone. Dopamine had no significant effects on perfusate flow, renin release or kallikrein excretion. Perfused control kidneys excreted amounts of dopamine (328 pmol/h, s.e.m. = 57, n = 6) far in excess of kidney dopamine content (49 pmol/g, s.e.m. = 6, n = 32). Renal handling of infused dopamine was dose-related; the fraction of the administered dose taken up and/or metabolized by the kidney on the higher dose infusion was considerably less than on the lower dose (40%, s.e.m. = 3 vs. 82%, s.e.m. = 6) while more was excreted (13%, s.e.m. = 3 vs. 2%, s.e.m. = 1). These studies indicate that dopamine at low doses can produce diuresis, natriuresis and kaluresis independently of extrarenal or haemodynamic influences and not mediated by renal renin or kallikrein systems. The kidney also exhibits a saturable capacity for dopamine uptake and/or metabolism.
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Howden B, Jablonski P, Rigol G, Birrell C, Rae D, Marshall VC, Tange J. Studies in renal preservation using a rat kidney transplant model: II. The effect of reflushing with citrate. Transplantation 1984; 37:52-4. [PMID: 6364488 DOI: 10.1097/00007890-198401000-00015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
This study investigated the possible beneficial effects of reflushing renal grafts with isotonic citrate solution. Rat kidneys were initially flushed with isotonic citrate or with Hartmann's solutions at O C. After 2 hr, half the kidneys of each group were reflushed with isotonic citrate; 22 hr later, all kidneys were transplanted into rats of the same inbred strain. All animals receiving kidneys flushed with Hartmann's solution died, whereas reflushing such kidneys with isotonic citrate significantly ameliorated the deleterious effects of Hartmann's solution. All animals receiving citrate-flushed kidneys survived with relatively good renal function and morphology. However, reflushing itself is not a beneficial procedure and is only of value where an ineffective preserving solution has been used to flush the kidneys initially. There is evidence that some of the adverse effects of flushing develop in the renal medulla.
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Jablonski P, Howden B, Leslie E, Rae D, Birrell C, Marshall VC, Tange J. Recovery of renal function after warm ischemia. I. The effect of chlorpromazine and phenoxybenzamine. Transplantation 1983; 35:535-9. [PMID: 6868121 DOI: 10.1097/00007890-198306000-00004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The effects of treatment with chlorpromazine (4 mg/kg) and phenoxybenzamine (1 and 5 mg/kg) on renal function and morphology after warm ischemia and contralateral nephrectomy were studied. Chlorpromazine pretreatment by intravenous injection 15 min before warm ischemia of 60 min resulted in the survival of all animals (cf. 75% in untreated group), with better renal function in the first week. Necrosis of the proximal convoluted tubule and ultimate residual cortical damage were less severe than in the untreated groups. Chlorpromazine was also beneficial after 75 min warm ischemia, although mortality was not reduced. Administration of chlorpromazine just prior to revascularization was ineffective, suggesting that sufficient concentration of the drug must be present in the kidney during the ischemic period or immediately after revascularization. Chlorpromazine probably protects the proximal tubular cells from ischemic damage. Phenoxybenzamine (1 mg/kg) was ineffective when administered 15 min before warm ischemia. A higher (5 mg/kg) dosage of the drug proved to be detrimental.
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Howden B, Rae D, Jablonski P, Marshall VC, Tange J. Studies of renal preservation using a rat kidney transplant model. Evaluation of citrate flushing. Transplantation 1983; 35:311-4. [PMID: 6340283 DOI: 10.1097/00007890-198304000-00009] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Rat kidneys were flushed with isotonic citrate solution, hypertonic citrate solution, or Collins's C2 solution, and were stored hypothermically for 24 hr before transplantation into another rat of the same inbred colony. The number of animals surviving for one month was greatest with isotonic-citrate-flushed kidneys (82%), and least with Collins's C2 solution (27%). Functional and morphological damage after transplantation was consistently greater in Collins's-flushed grafts, as compared with citrate-flushed grafts. Best results were attained with the isotonic-citrate flushed grafts. Seven days after contralateral nephrectomy all surviving animals had elevated serum creatinine and urea concentrations, along with decreased creatinine clearance, and they had secreted large volumes of dilute urine. Renal function was best in animals with isotonic-citrate-flushed grafts. After one month, significant improvement in urine osmolality, creatinine clearance, and serum creatinine had occurred only in the rats with citrate-flushed grafts. There were no significant differences between the citrate groups. All surviving rats had some residual renal cortical damage, but severe interstitial nephritis (greater than 30%) was much less frequent in the citrate groups.
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Abstract
The isolated rat kidney perfused at 37 C with dialyzed bovine serum albumin (6.5 g/100 ml) in Krebs-Henseleit buffer was used to examine why a hypertonic citrate flush permits rapid recovery of renal function after storage. The composition of the original hyperosmolar citrate solution was varied so that the roles of osmolality, magnesium, and citrate could be evaluated. All kidneys were flushed with the test solutions and stored for 24 hr in the test solutions at 0 C. The citrate flushing solution requires both the citrate anion and magnesium for efficacy. Hyperosmolality does not enhance its action, an isosmolar solution is more effective. Citrate can be replaced by a nonmetabolizable analogue, tricarballylate, if the solution is suitably buffered. The mechanism of action of citrate is still uncertain, it does not seem primarily to act as a metabolic fuel or inhibitor.
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Marshall V, Ross H, Escott M, Jablonski P, Howden B. Preservation of canine renal autografts. Transplantation 1980; 30:81. [PMID: 6994289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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