1
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Domínguez Conde C, Xu C, Jarvis LB, Rainbow DB, Wells SB, Gomes T, Howlett SK, Suchanek O, Polanski K, King HW, Mamanova L, Huang N, Szabo PA, Richardson L, Bolt L, Fasouli ES, Mahbubani KT, Prete M, Tuck L, Richoz N, Tuong ZK, Campos L, Mousa HS, Needham EJ, Pritchard S, Li T, Elmentaite R, Park J, Rahmani E, Chen D, Menon DK, Bayraktar OA, James LK, Meyer KB, Yosef N, Clatworthy MR, Sims PA, Farber DL, Saeb-Parsy K, Jones JL, Teichmann SA. Cross-tissue immune cell analysis reveals tissue-specific features in humans. Science 2022; 376:eabl5197. [PMID: 35549406 PMCID: PMC7612735 DOI: 10.1126/science.abl5197] [Citation(s) in RCA: 191] [Impact Index Per Article: 95.5] [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] [Indexed: 02/02/2023]
Abstract
Despite their crucial role in health and disease, our knowledge of immune cells within human tissues remains limited. We surveyed the immune compartment of 16 tissues from 12 adult donors by single-cell RNA sequencing and VDJ sequencing generating a dataset of ~360,000 cells. To systematically resolve immune cell heterogeneity across tissues, we developed CellTypist, a machine learning tool for rapid and precise cell type annotation. Using this approach, combined with detailed curation, we determined the tissue distribution of finely phenotyped immune cell types, revealing hitherto unappreciated tissue-specific features and clonal architecture of T and B cells. Our multitissue approach lays the foundation for identifying highly resolved immune cell types by leveraging a common reference dataset, tissue-integrated expression analysis, and antigen receptor sequencing.
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Affiliation(s)
- C Domínguez Conde
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - C Xu
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - LB Jarvis
- Department of Clinical Neurosciences, University of Cambridge
| | - DB Rainbow
- Department of Clinical Neurosciences, University of Cambridge
| | - SB Wells
- Department of Systems Biology, Columbia University Irving Medical Center
| | - T Gomes
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - SK Howlett
- Department of Clinical Neurosciences, University of Cambridge
| | - O Suchanek
- Molecular Immunity Unit, Department of Medicine, University of Cambridge, Cambridge, UK
| | - K Polanski
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - HW King
- Centre for Immunobiology, Blizard Institute, Queen Mary University of London, London, UK
| | - L Mamanova
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - N Huang
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - PA Szabo
- Department of Microbiology and Immunology, Columbia University Irving Medical Center
| | - L Richardson
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - L Bolt
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - ES Fasouli
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - KT Mahbubani
- Department of Surgery, University of Cambridge and NIHR Cambridge Biomedical Research Centre, Cambridge, UK
| | - M Prete
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - L Tuck
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - N Richoz
- Molecular Immunity Unit, Department of Medicine, University of Cambridge, Cambridge, UK
| | - ZK Tuong
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Molecular Immunity Unit, Department of Medicine, University of Cambridge, Cambridge, UK
| | - L Campos
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- West Suffolk Hospital NHS Trust, Bury Saint Edmunds, UK
| | - HS Mousa
- Department of Clinical Neurosciences, University of Cambridge
| | - EJ Needham
- Department of Clinical Neurosciences, University of Cambridge
| | - S Pritchard
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - T Li
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - R Elmentaite
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - J Park
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - E Rahmani
- Center for Computational Biology, University of California, Berkeley, Berkeley, CA, USA
- Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, Berkeley, CA, USA
| | - D Chen
- Department of Systems Biology, Columbia University Irving Medical Center
| | - DK Menon
- Department of Anaesthesia, University of Cambridge, Cambridge, UK
| | - OA Bayraktar
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - LK James
- Centre for Immunobiology, Blizard Institute, Queen Mary University of London, London, UK
| | - KB Meyer
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
| | - N Yosef
- Center for Computational Biology, University of California, Berkeley, Berkeley, CA, USA
- Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, Berkeley, CA, USA
- Chan Zuckerberg Biohub, San Francisco, CA, USA
- Ragon Institute of MGH, MIT and Harvard, Cambridge, MA, USA
| | - MR Clatworthy
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Molecular Immunity Unit, Department of Medicine, University of Cambridge, Cambridge, UK
| | - PA Sims
- Department of Systems Biology, Columbia University Irving Medical Center
| | - DL Farber
- Department of Microbiology and Immunology, Columbia University Irving Medical Center
| | - K Saeb-Parsy
- Department of Surgery, University of Cambridge and NIHR Cambridge Biomedical Research Centre, Cambridge, UK
| | - JL Jones
- Department of Clinical Neurosciences, University of Cambridge
| | - SA Teichmann
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, UK
- Theory of Condensed Matter, Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Ave, Cambridge CB3 0HE, UK
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2
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Oxley C, Thankappannair V, Saeb-Parsy K, Lamb B, Shah N, Kastner C, Geoghegan L, Fox H, Gnanapragasam V. 281 Impact of Using Risk Communication Tools in Counselling Patients with Newly Diagnosed Non-Metastatic Prostate Cancer. Br J Surg 2022. [DOI: 10.1093/bjs/znac039.183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Introduction
There have been substantial advances in risk communication tools that help patients understand prognosis associated with prostate cancer and the benefit/gain from treatment. Over the last three years, two tools; Cambridge Prognostic Groups (CPG), and Predict Prostate (https://prostate.predict.nhs.uk), along with decision-making consultations with clinical nurse specialists (CNS) have been integrated into the new diagnosis pathway in our unit.
Method
Treatment decisions for patients with new non-metastatic prostate cancer were audited after (2019–2020) and before (2016–2017) new risk communication tools were implemented. Data were compared between the two time periods and also benchmarked against national level data from the National Prostate Cancer Audit (NPCA) (Parry et al 2020; PMID: 32460859). The main outcome measured was comparison of rates of over and under-treatment of disease.
Results
168 and 95 patients were included in the 2019–2020 and 2016–2017 cohorts, respectively. Following implementation there was a reduction in over-treatment (use of radical surgery/radiotherapy) in patients with low risk/CPG1 (23% to 4%). These rates were also better than the national average from NPCA data (4% vs 11%). In parallel, there was an increase in use of radical treatment (reduced under-treatment) in high risk and very high-risk/CPG4-5 disease (84% vs 73%). Again, these rates were also superior to national level data from the NPCA (84% vs 76%).
Conclusions
Incorporating personalised risk-communication tools and dedicated CNS counselling in our unit has reduced over-treatment of early disease and under-treatment of advanced disease. Wider uptake could enhance risk-appropriate treatment of patients with a new prostate cancer diagnosis.
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Affiliation(s)
- C. Oxley
- University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom
| | - V. Thankappannair
- Department of Urology, Cambridge University Hospitals NHS Trust, Cambridge, United Kingdom
| | - K. Saeb-Parsy
- Department of Urology, Cambridge University Hospitals NHS Trust, Cambridge, United Kingdom
| | - B. Lamb
- Department of Urology, Cambridge University Hospitals NHS Trust, Cambridge, United Kingdom
| | - N. Shah
- Department of Urology, Cambridge University Hospitals NHS Trust, Cambridge, United Kingdom
| | - C. Kastner
- Department of Urology, Cambridge University Hospitals NHS Trust, Cambridge, United Kingdom
| | - L. Geoghegan
- Department of Urology, Cambridge University Hospitals NHS Trust, Cambridge, United Kingdom
| | - H. Fox
- Department of Urology, Cambridge University Hospitals NHS Trust, Cambridge, United Kingdom
| | - V. Gnanapragasam
- Department of Urology, Cambridge University Hospitals NHS Trust, Cambridge, United Kingdom
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3
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Colom B, Herms A, Hall MWJ, Dentro SC, King C, Sood RK, Alcolea MP, Piedrafita G, Fernandez-Antoran D, Ong SH, Fowler JC, Mahbubani KT, Saeb-Parsy K, Gerstung M, Hall BA, Jones PH. Mutant clones in normal epithelium outcompete and eliminate emerging tumours. Nature 2021; 598:510-514. [PMID: 34646013 PMCID: PMC7612642 DOI: 10.1038/s41586-021-03965-7] [Citation(s) in RCA: 73] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 08/26/2021] [Indexed: 02/08/2023]
Abstract
Human epithelial tissues accumulate cancer-driver mutations with age1-9, yet tumour formation remains rare. The positive selection of these mutations suggests that they alter the behaviour and fitness of proliferating cells10-12. Thus, normal adult tissues become a patchwork of mutant clones competing for space and survival, with the fittest clones expanding by eliminating their less competitive neighbours11-14. However, little is known about how such dynamic competition in normal epithelia influences early tumorigenesis. Here we show that the majority of newly formed oesophageal tumours are eliminated through competition with mutant clones in the adjacent normal epithelium. We followed the fate of nascent, microscopic, pre-malignant tumours in a mouse model of oesophageal carcinogenesis and found that most were rapidly lost with no indication of tumour cell death, decreased proliferation or an anti-tumour immune response. However, deep sequencing of ten-day-old and one-year-old tumours showed evidence of selection on the surviving neoplasms. Induction of highly competitive clones in transgenic mice increased early tumour removal, whereas pharmacological inhibition of clonal competition reduced tumour loss. These results support a model in which survival of early neoplasms depends on their competitive fitness relative to that of mutant clones in the surrounding normal tissue. Mutant clones in normal epithelium have an unexpected anti-tumorigenic role in purging early tumours through cell competition, thereby preserving tissue integrity.
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Affiliation(s)
- B Colom
- Wellcome Sanger Institute, Hinxton, UK
| | - A Herms
- Wellcome Sanger Institute, Hinxton, UK
| | - M W J Hall
- Wellcome Sanger Institute, Hinxton, UK
- MRC Cancer Unit, University of Cambridge, Hutchison-MRC Research Centre, Cambridge, UK
| | - S C Dentro
- Wellcome Sanger Institute, Hinxton, UK
- European Molecular Biology Laboratory, European Bioinformatics Institute, Cambridge, UK
| | - C King
- Wellcome Sanger Institute, Hinxton, UK
| | - R K Sood
- Wellcome Sanger Institute, Hinxton, UK
| | - M P Alcolea
- Wellcome-MRC Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre, Cambridge Biomedical Campus, University of Cambridge, Cambridge, UK
- Department of Oncology, University of Cambridge, Hutchison-MRC Research Centre, Cambridge, UK
| | - G Piedrafita
- Wellcome Sanger Institute, Hinxton, UK
- Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - D Fernandez-Antoran
- Wellcome Sanger Institute, Hinxton, UK
- Wellcome Trust-Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge, UK
| | - S H Ong
- Wellcome Sanger Institute, Hinxton, UK
| | | | - K T Mahbubani
- Department of Surgery and Cambridge NIHR Biomedical Research Centre, Cambridge, UK
| | - K Saeb-Parsy
- Department of Surgery and Cambridge NIHR Biomedical Research Centre, Cambridge, UK
| | - M Gerstung
- European Molecular Biology Laboratory, European Bioinformatics Institute, Cambridge, UK
- European Molecular Biology Laboratory, Genome Biology Unit, Heidelberg, Germany
| | - B A Hall
- Department of Medical Physics and Biomedical Engineering, University College London, London, United Kingdom
| | - P H Jones
- Wellcome Sanger Institute, Hinxton, UK.
- MRC Cancer Unit, University of Cambridge, Hutchison-MRC Research Centre, Cambridge, UK.
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4
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Georgiades F, Silva ANS, Purohit K, King S, Torpey N, Saeb-Parsy K, Pettigrew GJ, Rouhani FJ. Outpatient ureteric stent removal following kidney transplantation. Br J Surg 2021; 109:152-154. [PMID: 34435203 PMCID: PMC10364773 DOI: 10.1093/bjs/znab223] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 05/18/2021] [Indexed: 11/13/2022]
Abstract
Lay Summary
During a kidney transplant, a plastic tube (stent) is placed in the ureter, connecting the new kidney to the bladder, in order to keep the new join open during the initial phase of transplantation. The stent is then removed after a few weeks via a camera procedure (cystoscopy), as it is no longer needed. The present study compared performing this in the operating theatre or in clinic for transplanted patients using a new single-use type of camera with an integrated grasper system. The results have shown that it is safe and cost-effective to do this in clinic, despite patients being susceptible to infection after transplantation.
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Affiliation(s)
- F Georgiades
- Department of Surgery, University of Cambridge, and Cambridge National Institute for Health Research Biomedical Research Centre, Cambridge, UK
| | - A N S Silva
- Department of Surgery, University of Cambridge, and Cambridge National Institute for Health Research Biomedical Research Centre, Cambridge, UK
| | - K Purohit
- Department of Surgery, University of Cambridge, and Cambridge National Institute for Health Research Biomedical Research Centre, Cambridge, UK
| | - S King
- Transplant Unit, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - N Torpey
- Transplant Unit, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - K Saeb-Parsy
- Department of Surgery, University of Cambridge, and Cambridge National Institute for Health Research Biomedical Research Centre, Cambridge, UK
| | - G J Pettigrew
- Department of Surgery, University of Cambridge, and Cambridge National Institute for Health Research Biomedical Research Centre, Cambridge, UK
| | - F J Rouhani
- Department of Surgery, University of Cambridge, and Cambridge National Institute for Health Research Biomedical Research Centre, Cambridge, UK
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5
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Thakare N, Tanase F, Saeb-Parsy K, Atassi N, Endriss R, Kamphuis G, Pérez-Fentes D, Hasan M, Brehmer M, Osther P, Jung H, Turney B, Finch W, Burgess N, Irving S, Dragos L, Liatsikos E, Knoll T, Cauni V, Wiseman O. Stone clearance using the EMS Swiss LithoClast® Trilogy: Results of the European multicentre prospective study in comparison to the BAUS national PCNL outcomes on behalf of European Society of UroTechnology. Eur Urol 2021. [DOI: 10.1016/s0302-2838(21)00665-5] [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: 11/24/2022]
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6
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Thakare N, Tanase F, Saeb-Parsy K, Atassi N, Endriss R, Kamphuis G, Pérez-Fentes D, Hasan M, Brehmer M, Osther P, Jung H, Turney B, Finch W, Burgess N, Irving S, Dragos L, Liatsikos E, Knoll T, Cauni V, Wiseman O. Efficacy and safety of the EMS Swiss LithoClast® Trilogy for PCNL: results of the European multicentre prospective study on behalf of European Section of UroTechnology. World J Urol 2021; 39:4247-4253. [PMID: 33991214 PMCID: PMC8122211 DOI: 10.1007/s00345-021-03710-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 04/19/2021] [Indexed: 11/28/2022] Open
Abstract
Purpose PCNL requires a lithotrite to efficiently break stones, and some devices include active suction to remove the fragments. We set out to determine the efficacy and safety of the Swiss LithoClast® Trilogy, in a prospective European multicentre evaluation and compared it to published stone clearance rates for Trilogy based on surface area (68.9 mm2/min) and using the 3D calculated stone volume (526.7 mm3/min). Methods Ten European centres participated in this prospective non-randomized study of Trilogy for PCNL. Objective measures of stone clearance rate, device malfunction, complications and stone-free rates were assessed. Each surgeon subjectively evaluated ergonomic and device effectiveness, on a 1–10 scale (10 = extremely ergonomic/effective) and compared to their usual lithotrite on a 1–10 scale (10 = extremely effective). Results One hundred and fifty seven PCNLs using Trilogy were included (53% male, 47% female; mean age 55 years, range 13–84 years). Mean stone clearance rate was 65.55 mm2/min or 945 mm3/min based on calculated 3D volume. Stone-free rate on fluoroscopy screening at the end of the procedure was 83%. Feedback for suction effectiveness was 9.0 with 9.1 for combination and 9.0 for overall effectiveness compared to lithotrite used previously. Ergonomic score was 8.1, the least satisfactory element. Complications included 13 (8.2%) Clavien–Dindo Grade II and 2 (1.3%) Grade III. Probe breakage was seen in 9 (5.7%), none required using a different lithotrite. Conclusions We have demonstrated that Trilogy is highly effective at stone removal. From a user perspective, the device was perceived by surgeons to be highly effective overall and compared to the most commonly used previous lithotrite, with an excellent safety profile.
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Affiliation(s)
- N Thakare
- Department of Urology, Addenbrooke's Hospital, Cambridge University Hospitals NHS Trust, Hills Road, Cambridge, CB2 0QQ, UK.
| | - F Tanase
- Department of Urology, Colentina Clinical Hospital, Șoseaua Ștefan cel Mare 19-21, Bucharest, Romania
| | - K Saeb-Parsy
- Department of Urology, Addenbrooke's Hospital, Cambridge University Hospitals NHS Trust, Hills Road, Cambridge, CB2 0QQ, UK
| | - N Atassi
- Department of Urology, Sindelfingen-Boblingen Medical Center, Sindelfingen, Baden-Wurttemberg, Germany
| | - R Endriss
- Department of Urology, Sindelfingen-Boblingen Medical Center, Sindelfingen, Baden-Wurttemberg, Germany
| | - G Kamphuis
- Amsterdam UMC Locatie AMC, Department of Urology, Amsterdam University Medical Center, Meibergdreef, 91105 AZ, Amsterdam, The Netherlands
| | - D Pérez-Fentes
- Department of Urology, University Hospital Complex of Santiago de Compostela, 15706, Santiago de Compostela, Spain
| | - M Hasan
- Department of Urology, Danderyd University Hospital, Stockholm, Sweden
| | - M Brehmer
- Department of Urology, Danderyd University Hospital, Stockholm, Sweden
| | - P Osther
- Lillebaelt Hospital, Department of Urology, University of Southern Denmark, Beriderbakken 4, Vejle, Denmark
| | - H Jung
- Lillebaelt Hospital, Department of Urology, University of Southern Denmark, Beriderbakken 4, Vejle, Denmark
| | - B Turney
- The Churchill Hospital, Oxford, OX3 7LJ, UK
| | - W Finch
- Department of Urology, Norfolk and Norwich University Hospitals NHS Foundation Trust, Colney Ln, Norwich, NR4 7UY, UK
| | - N Burgess
- Department of Urology, Norfolk and Norwich University Hospitals NHS Foundation Trust, Colney Ln, Norwich, NR4 7UY, UK
| | - S Irving
- Department of Urology, Norfolk and Norwich University Hospitals NHS Foundation Trust, Colney Ln, Norwich, NR4 7UY, UK
| | - L Dragos
- Department of Urology, Addenbrooke's Hospital, Cambridge University Hospitals NHS Trust, Hills Road, Cambridge, CB2 0QQ, UK
| | - E Liatsikos
- Department of Urology, University Hospital, University of Patras, Rio, 26500, Patras, Greece
| | - T Knoll
- Department of Urology, Sindelfingen-Boblingen Medical Center, Sindelfingen, Baden-Wurttemberg, Germany
| | - V Cauni
- Department of Urology, Colentina Clinical Hospital, Șoseaua Ștefan cel Mare 19-21, Bucharest, Romania
| | - O Wiseman
- Department of Urology, Addenbrooke's Hospital, Cambridge University Hospitals NHS Trust, Hills Road, Cambridge, CB2 0QQ, UK
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7
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Hamed M, Logan A, Gruszczyk AV, Beach TE, James AM, Dare AJ, Barlow A, Martin J, Georgakopoulos N, Gane AM, Crick K, Fouto D, Fear C, Thiru S, Dolezalova N, Ferdinand JR, Clatworthy MR, Hosgood SA, Nicholson ML, Murphy MP, Saeb-Parsy K. Mitochondria-targeted antioxidant MitoQ ameliorates ischaemia-reperfusion injury in kidney transplantation models. Br J Surg 2021; 108:1072-1081. [PMID: 33963377 DOI: 10.1093/bjs/znab108] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 02/28/2021] [Indexed: 11/12/2022]
Abstract
BACKGROUND Ischaemia-reperfusion (IR) injury makes a major contribution to graft damage during kidney transplantation. Oxidative damage to mitochondria is an early event in IR injury. Therefore, the uptake, safety, and efficacy of the mitochondria-targeted antioxidant MitoQ were investigated in models of transplant IR injury. METHODS MitoQ uptake by warm and cooled pairs of pig and declined human kidneys was measured when preserved in cold static storage or by hypothermic machine perfusion. Pairs of pigs' kidneys were exposed to defined periods of warm and cold ischaemia, flushed and stored at 4°C with or without MitoQ (50 nmol/l to 250 µmol/l), followed by reperfusion with oxygenated autologous blood in an ex vivo normothermic perfusion (EVNP). Pairs of declined human kidneys were flushed and stored with or without MitoQ (5-100 µmol/l) at 4°C for 6 h and underwent EVNP with ABO group-matched blood. RESULTS Stable and concentration-dependent uptake of MitoQ was demonstrated for up to 24 h in pig and human kidneys. Total blood flow and urine output were significantly greater in pig kidneys treated with 50 µmol/l MitoQ compared with controls (P = 0.006 and P = 0.007 respectively). In proof-of-concept experiments, blood flow after 1 h of EVNP was significantly greater in human kidneys treated with 50 µmol/l MitoQ than in controls (P ≤ 0.001). Total urine output was numerically higher in the 50-µmol/l MitoQ group compared with the control, but the difference did not reach statistical significance (P = 0.054). CONCLUSION Mitochondria-targeted antioxidant MitoQ can be administered to ischaemic kidneys simply and effectively during cold storage, and may improve outcomes after transplantation.
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Affiliation(s)
- M Hamed
- Department of Surgery, University of Cambridge, Cambridge, UK.,MRC Mitochondrial Biology Unit, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
| | - A Logan
- MRC Mitochondrial Biology Unit, Cambridge, UK
| | - A V Gruszczyk
- Department of Surgery, University of Cambridge, Cambridge, UK.,MRC Mitochondrial Biology Unit, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
| | - T E Beach
- Department of Surgery, University of Cambridge, Cambridge, UK.,MRC Mitochondrial Biology Unit, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
| | - A M James
- MRC Mitochondrial Biology Unit, Cambridge, UK
| | - A J Dare
- Department of Surgery, University of Cambridge, Cambridge, UK.,MRC Mitochondrial Biology Unit, Cambridge, UK
| | - A Barlow
- Department of Surgery, University of Cambridge, Cambridge, UK
| | - J Martin
- Department of Surgery, University of Cambridge, Cambridge, UK.,MRC Mitochondrial Biology Unit, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
| | - N Georgakopoulos
- Department of Surgery, University of Cambridge, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
| | - A M Gane
- Department of Surgery, University of Cambridge, Cambridge, UK.,MRC Mitochondrial Biology Unit, Cambridge, UK
| | - K Crick
- Department of Surgery, University of Cambridge, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
| | - D Fouto
- Department of Surgery, University of Cambridge, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
| | - C Fear
- Department of Surgery, University of Cambridge, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
| | - S Thiru
- Department of Pathology, Cambridge University Hospitals NHS Trust, Addenbrooke's Hospital, Cambridge, UK
| | - N Dolezalova
- Department of Surgery, University of Cambridge, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
| | - J R Ferdinand
- Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK.,Department of Medicine, University of Cambridge, Cambridge, UK
| | - M R Clatworthy
- Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK.,Department of Medicine, University of Cambridge, Cambridge, UK
| | - S A Hosgood
- Department of Surgery, University of Cambridge, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
| | - M L Nicholson
- Department of Surgery, University of Cambridge, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
| | - M P Murphy
- MRC Mitochondrial Biology Unit, Cambridge, UK.,Department of Medicine, University of Cambridge, Cambridge, UK
| | - K Saeb-Parsy
- Department of Surgery, University of Cambridge, Cambridge, UK.,Cambridge National Institute for Health Research (NIHR) Biomedical Research Centre and NIHR Blood and Transplant Research Unit in Organ Donation and Transplantation, Cambridge, UK
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8
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Hamed MO, Barlow AD, Dolezalova N, Khosla S, Sagar A, Gribble FM, Davies S, Murphy MP, Hosgood SA, Nicholson ML, Saeb-Parsy K. Ex vivo normothermic perfusion of isolated segmental porcine bowel: a novel functional model of the small intestine. BJS Open 2021; 5:6220254. [PMID: 33839750 PMCID: PMC8038264 DOI: 10.1093/bjsopen/zrab009] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 01/26/2021] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND There is an unmet need for suitable ex vivo large animal models in experimental gastroenterology and intestinal transplantation. This study details a reliable and effective technique for ex vivo normothermic perfusion (EVNP) of segmental porcine small intestine. METHODS Segments of small intestine, 1.5-3.0 m in length, were retrieved from terminally anaesthetized pigs. After a period of cold ischaemia, EVNP was performed for 2 h at 37°C with a mean pressure of 80 mmHg using oxygenated autologous blood diluted with Ringer's solution. The duration of EVNP was extended to 4 h for a second set of experiments in which two segments of proximal to mid-ileum (1.5-3.0 m) were retrieved from each animal and reperfused with whole blood (control) or leucocyte-depleted blood to examine the impact of leucocyte depletion on reperfusion injury. RESULTS After a mean cold ischaemia time of 5 h and 20 min, EVNP was performed in an initial group of four pigs. In the second set of experiments, five pigs were used in each group. In all experiments bowel segments were well perfused and exhibited peristalsis during EVNP. Venous glucose levels significantly increased following luminal glucose stimulation (mean(s.e.m.) basal level 1.8(0.6) mmol/l versus peak 15.5(5.8) mmol/l; P < 0.001) and glucagon-like peptide 1 (GLP-1) levels increased in all experiments, demonstrating intact absorptive and secretory intestinal functions. There were no significant differences between control and leucocyte-depleted animals regarding blood flow, venous glucose, GLP-1 levels or histopathology at the end of 4 h of EVNP. CONCLUSIONS This novel model is suitable for the investigation of gastrointestinal physiology, pathology and ischaemia reperfusion injury, along with evaluation of potential therapeutic interventions.
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Affiliation(s)
- M O Hamed
- Correspondence to: Department of Surgery, Addenbrookes Hospital, Hills Road, Cambridge, CB2 0QQ, UK (e-mail:)
| | - A D Barlow
- Department of Surgery, University of Cambridge, and NIHR Cambridge Biomedical Research Campus, Cambridge, UK
| | - N Dolezalova
- Department of Surgery, University of Cambridge, and NIHR Cambridge Biomedical Research Campus, Cambridge, UK
| | - S Khosla
- Wellcome Trust – MRC Institute of Metabolic Science, University of Cambridge, Cambridge, UK
| | - A Sagar
- Wellcome Trust – MRC Institute of Metabolic Science, University of Cambridge, Cambridge, UK
| | - F M Gribble
- Department of Histopathology, University of Cambridge, Cambridge, UK
| | - S Davies
- Department of Histopathology, University of Cambridge, Cambridge, UK
| | - M P Murphy
- MRC Mitochondrial Biology Unit, Cambridge, UK
| | - S A Hosgood
- Department of Surgery, University of Cambridge, and NIHR Cambridge Biomedical Research Campus, Cambridge, UK
| | - M L Nicholson
- Department of Surgery, University of Cambridge, and NIHR Cambridge Biomedical Research Campus, Cambridge, UK
| | - K Saeb-Parsy
- Department of Surgery, University of Cambridge, and NIHR Cambridge Biomedical Research Campus, Cambridge, UK
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9
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Wiseman O, Tanse F, Saeb-Parsy K, Atassi N, Endriss R, Kamphuis G, Pèrez Fentes D, Hassan M, Brehmer M, Osther P, Jung H, Turney B, Finch W, Burgess N, Irving S, Liatsikos E, Knoll T, Cauni V. The efficacy and safety of the EMS Lithoclast Trilogy: A European multicenter prospective study on behalf of ESUT. EUR UROL SUPPL 2020. [DOI: 10.1016/s2666-1683(20)33852-0] [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: 11/29/2022] Open
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10
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Madissoon E, Wilbrey-Clark A, Miragaia RJ, Saeb-Parsy K, Mahbubani KT, Georgakopoulos N, Harding P, Polanski K, Huang N, Nowicki-Osuch K, Fitzgerald RC, Loudon KW, Ferdinand JR, Clatworthy MR, Tsingene A, van Dongen S, Dabrowska M, Patel M, Stubbington MJT, Teichmann SA, Stegle O, Meyer KB. scRNA-seq assessment of the human lung, spleen, and esophagus tissue stability after cold preservation. Genome Biol 2019; 21:1. [PMID: 31892341 PMCID: PMC6937944 DOI: 10.1186/s13059-019-1906-x] [Citation(s) in RCA: 251] [Impact Index Per Article: 50.2] [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: 08/09/2019] [Accepted: 11/28/2019] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND The Human Cell Atlas is a large international collaborative effort to map all cell types of the human body. Single-cell RNA sequencing can generate high-quality data for the delivery of such an atlas. However, delays between fresh sample collection and processing may lead to poor data and difficulties in experimental design. RESULTS This study assesses the effect of cold storage on fresh healthy spleen, esophagus, and lung from ≥ 5 donors over 72 h. We collect 240,000 high-quality single-cell transcriptomes with detailed cell type annotations and whole genome sequences of donors, enabling future eQTL studies. Our data provide a valuable resource for the study of these 3 organs and will allow cross-organ comparison of cell types. We see little effect of cold ischemic time on cell yield, total number of reads per cell, and other quality control metrics in any of the tissues within the first 24 h. However, we observe a decrease in the proportions of lung T cells at 72 h, higher percentage of mitochondrial reads, and increased contamination by background ambient RNA reads in the 72-h samples in the spleen, which is cell type specific. CONCLUSIONS In conclusion, we present robust protocols for tissue preservation for up to 24 h prior to scRNA-seq analysis. This greatly facilitates the logistics of sample collection for Human Cell Atlas or clinical studies since it increases the time frames for sample processing.
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Affiliation(s)
- E. Madissoon
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
- European Molecular Biology Laboratory - European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SD UK
| | - A. Wilbrey-Clark
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
| | - R. J. Miragaia
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
| | - K. Saeb-Parsy
- Department of Surgery, University of Cambridge and NIHR Cambridge Biomedical Research Centre, Cambridge, CB2 0QQ UK
| | - K. T. Mahbubani
- Department of Surgery, University of Cambridge and NIHR Cambridge Biomedical Research Centre, Cambridge, CB2 0QQ UK
| | - N. Georgakopoulos
- Department of Surgery, University of Cambridge and NIHR Cambridge Biomedical Research Centre, Cambridge, CB2 0QQ UK
| | - P. Harding
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
| | - K. Polanski
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
| | - N. Huang
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
| | - K. Nowicki-Osuch
- MRC Cancer Unit, Hutchison-MRC Research Centre, University of Cambridge, Cambridge, CB2 0XZ UK
| | - R. C. Fitzgerald
- MRC Cancer Unit, Hutchison-MRC Research Centre, University of Cambridge, Cambridge, CB2 0XZ UK
| | - K. W. Loudon
- Molecular Immunology Unit, Department of Medicine, Cambridge, CB2 0QQ UK
| | - J. R. Ferdinand
- Molecular Immunology Unit, Department of Medicine, Cambridge, CB2 0QQ UK
| | - M. R. Clatworthy
- Molecular Immunology Unit, Department of Medicine, Cambridge, CB2 0QQ UK
| | - A. Tsingene
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
| | - S. van Dongen
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
| | - M. Dabrowska
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
| | - M. Patel
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
| | - M. J. T. Stubbington
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
- 10x Genomics Inc., 6230 Stoneridge Mall Road, Pleasanton, CA 94588 USA
| | - S. A. Teichmann
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
| | - O. Stegle
- European Molecular Biology Laboratory - European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SD UK
| | - K. B. Meyer
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
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11
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Mahbubani K, Kilbride P, Slater N, Saeb-Parsy K, Morris J. Hypothermic treatment to alter the rate of cell proliferation. Cryobiology 2016. [DOI: 10.1016/j.cryobiol.2016.09.095] [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: 10/20/2022]
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12
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Mahbubani K, Dolezalova N, Kilbride P, Georgakopoulos N, Morris J, Slater N, Saeb-Parsy K. Effects of cell density on viability post cryopreservation. Cryobiology 2016. [DOI: 10.1016/j.cryobiol.2016.09.097] [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: 11/28/2022]
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13
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Dolezalova N, Georgakopoulos N, Calderbank E, Laurenti E, Slater N, Mahbubani K, Saeb-Parsy K. A novel cryoprotectant for preservation of human haematopoietic stem cells. Cryobiology 2016. [DOI: 10.1016/j.cryobiol.2016.09.013] [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: 11/26/2022]
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14
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Mallon DH, Riddiough GE, Summers DM, Butler AJ, Callaghan CJ, Bradbury LL, Bardsley V, Broecker V, Saeb-Parsy K, Torpey N, Bradley JA, Pettigrew GJ. Successful transplantation of kidneys from elderly circulatory death donors by using microscopic and macroscopic characteristics to guide single or dual implantation. Am J Transplant 2015; 15:2931-9. [PMID: 26108421 DOI: 10.1111/ajt.13349] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 03/26/2015] [Accepted: 04/10/2015] [Indexed: 01/25/2023]
Abstract
Most kidneys from potential elderly circulatory death (DCD) donors are declined. We report single center outcomes for kidneys transplanted from DCD donors over 70 years old, using preimplantation biopsy Remuzzi grading to inform implantation as single or dual transplants. Between 2009 and 2012, 43 single transplants and 12 dual transplants were performed from elderly DCD donors. Remuzzi scores were higher for dual than single implants (4.4 vs. 3.4, p < 0.001), indicating more severe baseline injury. Donor and recipient characteristics for both groups were otherwise similar. Early graft loss from renal vein thrombosis occurred in two singly implanted kidneys, and in one dual-implanted kidney; its pair continued to function satisfactorily. Death-censored graft survival at 3 years was comparable for the two groups (single 94%; dual 100%), as was 1 year eGFR. Delayed graft function occurred less frequently in the dual-implant group (25% vs. 65%, p = 0.010). Using this approach, we performed proportionally more kidney transplants from elderly DCD donors (23.4%) than the rest of the United Kingdom (7.3%, p < 0.001), with graft outcomes comparable to those achieved nationally for all deceased-donor kidney transplants. Preimplantation biopsy analysis is associated with acceptable transplant outcomes for elderly DCD kidneys and may increase transplant numbers from an underutilized donor pool.
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Affiliation(s)
- D H Mallon
- University Department of Surgery, Addenbrooke's Hospital, Cambridge, UK
| | - G E Riddiough
- University Department of Surgery, Addenbrooke's Hospital, Cambridge, UK
| | - D M Summers
- University Department of Surgery, Addenbrooke's Hospital, Cambridge, UK
| | - A J Butler
- University Department of Surgery, Addenbrooke's Hospital, Cambridge, UK
| | - C J Callaghan
- University Department of Surgery, Addenbrooke's Hospital, Cambridge, UK
| | | | - V Bardsley
- Department of Histopathology, Addenbrooke's Hospital, Cambridge, UK
| | - V Broecker
- Department of Histopathology, Addenbrooke's Hospital, Cambridge, UK
| | - K Saeb-Parsy
- University Department of Surgery, Addenbrooke's Hospital, Cambridge, UK
| | - N Torpey
- Department of Renal Medicine, Addenbrooke's Hospital, Cambridge, UK
| | - J A Bradley
- University Department of Surgery, Addenbrooke's Hospital, Cambridge, UK
| | - G J Pettigrew
- University Department of Surgery, Addenbrooke's Hospital, Cambridge, UK
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15
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Hausien O, Martin J, Saeb-Parsy K. Early graft loss following liver transplantation: Causes and consequences. Int J Surg 2015. [DOI: 10.1016/j.ijsu.2015.07.037] [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: 10/22/2022]
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16
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Barlow AD, Hamed MO, Mallon DH, Brais RJ, Gribble FM, Scott MA, Howat WJ, Bradley JA, Bolton EM, Pettigrew GJ, Hosgood SA, Nicholson ML, Saeb-Parsy K. Use of Ex Vivo Normothermic Perfusion for Quality Assessment of Discarded Human Donor Pancreases. Am J Transplant 2015; 15:2475-82. [PMID: 25989187 PMCID: PMC7212093 DOI: 10.1111/ajt.13303] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 02/10/2015] [Accepted: 02/28/2015] [Indexed: 01/25/2023]
Abstract
A significant number of pancreases procured for transplantation are deemed unsuitable due to concerns about graft quality and the associated risk of complications. However, this decision is subjective and some declined grafts may be suitable for transplantation. Ex vivo normothermic perfusion (EVNP) prior to transplantation may allow a more objective assessment of graft quality and reduce discard rates. We report ex vivo normothermic perfusion of human pancreases procured but declined for transplantation, with ABO-compatible warm oxygenated packed red blood cells for 1-2 h. Five declined human pancreases were assessed using this technique after a median cold ischemia time of 13 h 19 min. One pancreas, with cold ischemia over 30 h, did not appear viable and was excluded. In the remaining pancreases, blood flow and pH were maintained throughout perfusion. Insulin secretion was observed in all four pancreases, but was lowest in an older donation after cardiac death pancreas. Amylase levels were highest in a gland with significant fat infiltration. This is the first study to assess the perfusion, injury, as measured by amylase, and exocrine function of human pancreases using EVNP and demonstrates the feasibility of the approach, although further refinements are required.
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Affiliation(s)
- AD Barlow
- Dept of Surgery, University of Cambridge, Cambridge, UK,NIHR Biomedical Research Campus, Cambridge, UK
| | - MO Hamed
- Dept of Surgery, University of Cambridge, Cambridge, UK,NIHR Biomedical Research Campus, Cambridge, UK
| | - DH Mallon
- Dept of Surgery, University of Cambridge, Cambridge, UK,NIHR Biomedical Research Campus, Cambridge, UK
| | - RJ Brais
- NIHR Biomedical Research Campus, Cambridge, UK,Dept of Histopathology, Addenbrooke’s Hospital, Cambridge, UK
| | - FM Gribble
- NIHR Biomedical Research Campus, Cambridge, UK,Institute of Metabolic Science, University of Cambridge, Cambridge, UK
| | - MA Scott
- NIHR Biomedical Research Campus, Cambridge, UK,Dept of Haematology, Addenbrooke’s Hospital, Cambridge, UK
| | - WJ Howat
- NIHR Biomedical Research Campus, Cambridge, UK,Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge, UK
| | - JA Bradley
- Dept of Surgery, University of Cambridge, Cambridge, UK,NIHR Biomedical Research Campus, Cambridge, UK
| | - EM Bolton
- Dept of Surgery, University of Cambridge, Cambridge, UK,NIHR Biomedical Research Campus, Cambridge, UK
| | - GJ Pettigrew
- Dept of Surgery, University of Cambridge, Cambridge, UK,NIHR Biomedical Research Campus, Cambridge, UK
| | - SA Hosgood
- Division of Transplant Surgery, University of Leicester, Leicester, UK
| | - ML Nicholson
- Division of Transplant Surgery, University of Leicester, Leicester, UK
| | - K Saeb-Parsy
- Dept of Surgery, University of Cambridge, Cambridge, UK,NIHR Biomedical Research Campus, Cambridge, UK
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17
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Hamed MO, Chen Y, Pasea L, Watson CJ, Torpey N, Bradley JA, Pettigrew G, Saeb-Parsy K. Early graft loss after kidney transplantation: risk factors and consequences. Am J Transplant 2015; 15:1632-43. [PMID: 25707303 DOI: 10.1111/ajt.13162] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 12/12/2014] [Accepted: 12/14/2014] [Indexed: 01/25/2023]
Abstract
Early graft loss (EGL) after kidney transplantation is a catastrophic outcome that is assumed to be more likely after the use of kidneys from suboptimal donors. We therefore examined its incidence, risk factors and consequences in our center in relation to different donor types. Of 801 recipients who received a kidney-only transplant from deceased donors, 50 (6.2%) suffered EGL within 30 days of transplantation. Significant risks factors for EGL were donation after circulatory death (DCD) (odds ratio [OR] 2.88; p = 0.006), expanded criteria donor (ECD) transplantation (OR 4.22; p = 0.010), donor age (OR 1.03; p = 0.044) and recipient past history of thrombosis (OR 4.91; p = 0.001). Recipients with EGL had 12.28 times increased risk of death within the first year, but long-term survival was worse for patients remaining on the waiting list. In comparison with patients on the waiting list but not transplanted, and with all patients on the waiting list, the risk of death after EGL decreased to baseline 4 and 23 months after transplantation, respectively. Our findings suggest that DCD and ECD transplantation are significant risk factors for EGL, which is a major risk factor for recipient death. However, long-term mortality is even greater for those remaining on the waiting list.
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Affiliation(s)
- M O Hamed
- Department of Surgery, University of Cambridge, and NIHR Cambridge Biomedical Research Centre, Cambridge, UK
| | - Y Chen
- Department of Pure Mathematics and Mathematical Statistics, Cambridge, UK
| | - L Pasea
- Centre for Applied Medical Statistics, University of Cambridge, Cambridge, UK
| | - C J Watson
- Department of Surgery, University of Cambridge, and NIHR Cambridge Biomedical Research Centre, Cambridge, UK
| | - N Torpey
- Department of Renal Medicine, Addenbrooke's Hospital, Cambridge, UK
| | - J A Bradley
- Department of Surgery, University of Cambridge, and NIHR Cambridge Biomedical Research Centre, Cambridge, UK
| | - G Pettigrew
- Department of Surgery, University of Cambridge, and NIHR Cambridge Biomedical Research Centre, Cambridge, UK
| | - K Saeb-Parsy
- Department of Surgery, University of Cambridge, and NIHR Cambridge Biomedical Research Centre, Cambridge, UK
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18
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Kosmoliaptsis V, Salji M, Bardsley V, Chen Y, Thiru S, Griffiths MH, Copley HC, Saeb-Parsy K, Bradley JA, Torpey N, Pettigrew GJ. Baseline donor chronic renal injury confers the same transplant survival disadvantage for DCD and DBD kidneys. Am J Transplant 2015; 15:754-63. [PMID: 25639995 DOI: 10.1111/ajt.13009] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [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: 06/12/2014] [Revised: 08/06/2014] [Accepted: 08/28/2014] [Indexed: 01/25/2023]
Abstract
Histological assessment of baseline chronic kidney injury may discriminate kidneys that are suitable for transplantation, but has not been validated for appraisal of donation after circulatory death (DCD) kidneys. 'Time-zero' biopsies for 371 consecutive, solitary, deceased-donor kidneys transplanted at our center between 2006 and 2010 (65.5% DCD, 34.5% donation after brain death [DBD]) were reviewed and baseline chronic degenerative injury scored using Remuzzi's classification. High scores correlated with donor age and extended criteria donors (42% of donors), but the spectrum of scores was similar for DCD and DBD kidneys. Transplant outcomes for kidneys scoring from 0 to 4 were comparable (1 and 3 year graft survival 95% and 92%), but were much poorer for kidneys scoring ≥5, with 1 year graft survival only 73%, and 12.5% suffering primary nonfunction. Critically, high Remuzzi scores conferred the same survival disadvantage for DCD and DBD kidneys. On multi-variable regression analysis, time-zero biopsy score was the only independent predictor for graft survival, whereas one-year graft estimated glomerular filtration rate (eGFR) correlated with donor age and biopsy score. In conclusion, the relationship between severity of chronic kidney injury and transplant outcome is similar for DCD and DBD kidneys. Kidneys with Remuzzi scores of ≤4 can be implanted singly with acceptable results.
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Affiliation(s)
- V Kosmoliaptsis
- Department of Surgery, University of Cambridge, and NIHR Cambridge Biomedical Research Centre, Cambridge, UK
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19
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Wlodek E, Jason A, Saeb-Parsy K, Chhubra M, Pettigrew G. Alloreactive CD8 T Cells Process and Present Acquired MHC Class I Alloantigen To Indirect Pathway Helper CD4 T Cells. Transplantation 2014. [DOI: 10.1097/00007890-201407151-00979] [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: 11/25/2022]
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20
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Narine N, Rana D, Stewart G, Thottakam B, Donnini A, Wilson A, Turner B, Burrill W, Saeb-Parsy K, Harrison D. MCM As A Useful Biomarker For Graded Differentiation In Urothelial Cancer. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)32809-x] [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: 11/29/2022] Open
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21
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Serag H, Banerjee S, Saeb-Parsy K, Irving S, Wright K, Stearn S, Doble A, Gnanapragasam VJ. Risk profiles of prostate cancers identified from UK primary care using national referral guidelines. Br J Cancer 2012; 106:436-9. [PMID: 22240787 PMCID: PMC3273344 DOI: 10.1038/bjc.2011.596] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Objective: Prostate cancer in the United Kingdom is mainly diagnosed from primary care referrals based on national guidelines published by the Department of Health. Here we investigated the characteristics of cancers detected through the use of these guidelines. Methods: A prospective two-centre study was established to assess men referred from the primary care based on the UK national guidelines. Results: The overall cancer detection rate was 43% (169 out of 397) with 15% (26 out of 169) of all cancers metastatic at presentation. Amongst 50–69-year-old men these rates were 34% (68 out of 200) and 15% (10 out of 68). Only 21% (25 out of 123) of men with local cancers had low-risk disease. In comparison to a historical cohort from 2001 (n=137) we found no overall differences in rates of metastatic disease, locally advanced tumours, or risk categories. Amongst 50–69-year-old men with local disease, however, we observed an increase in detection of low-risk cancers in a contemporary cohort (P=0.04). This was primarily because of the increased detection of low-stage organ-confined tumours in this group (P=0.02). Conclusion: Use of the UK prostate cancer guidelines detects a high proportion of clinically significant cancers. Use of the guidelines does not seem to have led to an overall change in the clinical characteristics of presenting cancers. There may, however, be a specific benefit in detecting more low-risk disease in younger men.
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Affiliation(s)
- H Serag
- Department of Urology, Addenbrookes Hospital, Hills Road, Cambridge CB2 0XZ, UK
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22
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Saeb-Parsy K, Mills A, Rang C, Reed JB, Harris AM. Emergency laparoscopic cholecystectomy in an unselected cohort: a safe and viable option in a specialist centre. Int J Surg 2010; 8:489-93. [PMID: 20633707 DOI: 10.1016/j.ijsu.2010.06.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Accepted: 06/15/2010] [Indexed: 10/19/2022]
Abstract
INTRODUCTION Patients presenting acutely with symptomatic gallstone-related disease have historically had their laparoscopic cholecystectomy (LC) deferred due to perceived increased operative risks in the acute setting, particularly conversion to open surgery. The aim of this study was to compare morbidity and mortality between unselected cohorts of patients undergoing elective and 'emergency' LC in a District General Hospital. METHODS All gallstone-related elective and emergency admissions under the care of two specialist laparoscopic surgeons during a two-year period were included. Patients admitted acutely with a diagnosis of biliary colic, acute cholecystitis or gallstone pancreatitis underwent 'emergency' LC during the same admission. Data were collected prospectively on patient demographics, inpatient stay, post-operative course and POSSUM scores. RESULTS 423 patients underwent LC, of which 301 (71.1%) were elective and 122 (28.9%) were 'emergency' procedures. ASA grades and POSSUM physiologic scores were similar between the two groups. The overall morbidity rates were similar in the emergency and elective groups (13.1% vs. 7.3%, p = 0.088), and there was no significant difference in the rates of major complications including conversion to open surgery (0% vs. 0.3%, NS), bile leak or re-operation between the two groups. 30-day mortality rates were similar in the two groups (0.8% vs. 0%, NS). CONCLUSION When performed by specialist laparoscopic surgeons, LC in the acute setting is safe with mortality and morbidity rates, including conversion to open surgery, comparable to elective LC.
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Affiliation(s)
- K Saeb-Parsy
- Hinchingbrooke Hospital, Hinchingbrooke Park, Huntingdon, Cambridgeshire, PE29 6NT, United Kingdom.
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23
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Affiliation(s)
- J R Benson
- Cambridge Breast Unit, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 2QQ, United Kingdom.
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24
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Abstract
The effects of diltiazem treatment on symptoms of chronic anal fissures and their long-term outcome were investigated. One hundred and twelve patients were supplied with 6-week course of 2% diltiazem cream for twice-daily topical application. The medical notes and extended follow-up by telephone for 112 patients were recorded and statistically analysed. The success rate and satisfaction of topical diltiazem were each over two thirds. Nearly 80% of patients reported no adverse effects, and it seems that those complaints attributed to diltiazem rarely led to reduced compliance. After diltiazem therapy for fissure, 59% of patients required further treatment (medical and/or surgical) over the average 2-year period of follow-up. The reported adverse effects of topical diltiazem treatment in patients with anal fissures were more common than previously thought, although compliance was rarely affected. During consultation regarding the advantages and disadvantages of surgical vs. chemical sphincterotomy, patients should be aware that the majority of patients receiving diltiazem as the primary treatment for anal fissure subsequently require further treatment.
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Abstract
Blunt abdominal trauma is a common cause of admission to the typical trauma centre. Hollow viscus injury from blunt trauma, however, is unusual and rarely involves the stomach. A 15 year old boy sustained a bicycle handle bar injury to the abdomen and presented to the casualty department four days later with melaena. A computed tomography (CT) scan of the abdomen showed normal findings but endoscopy revealed two "kissing" areas of mucosal ulceration on the anterior and posterior wall of the gastric antrum. The patient received a blood transfusion for anaemia but was otherwise treated conservatively and made a full recovery. The authors believe this to be the first reported case of melaena as the primary presenting symptom of gastric ulceration secondary to blunt abdominal trauma. Diagnosis of hollow viscus injuries due to blunt abdominal trauma requires a high index of suspicion and thorough investigation, particularly if the presentation is delayed.
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Affiliation(s)
- K Saeb-Parsy
- Department of Surgery, Addenbrooke's Hospital, Cambridge, UK.
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Bhumbra GS, Inyushkin AN, Saeb-Parsy K, Hon A, Dyball REJ. Rhythmic changes in spike coding in the rat suprachiasmatic nucleus. J Physiol 2005; 563:291-307. [PMID: 15611016 PMCID: PMC1665572 DOI: 10.1113/jphysiol.2004.079848] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 11/23/2004] [Accepted: 12/16/2004] [Indexed: 11/08/2022] Open
Abstract
The suprachiasmatic nucleus is regarded as the main mammalian circadian pacemaker but evidence for rhythmic firing of single units in vivo has been obtained only recently. The present study was undertaken to determine if rhythms could be seen using measures of activity in addition to the mean spike frequency. We investigated whether there were changes in the irregularity of cell activity measured by the disorder of the interspike interval distribution for neurones recorded in vivo and in vitro. By plotting the entropy of the log interval histogram that quantifies the coding capacity for each action potential against the respective zeitgeber time, we describe oscillations of spike activity in vivo. Entropy measures have the advantage over variances in that they quantify aspects of the shape of the distribution and not just the dispersion. One hundred and sixty-six cell recordings from the suprachiasmatic nucleus showed a significant rhythm in entropy with an oscillatory trend in the data (P < 0.001) showing a trough towards the end of the light period and a peak in the mid-dark period. There was a similar rhythm for the cells recorded from the peripheral zone (n = 209, P = 0.037). In separate experiments in vitro, to investigate the relationship between mean spike frequency and entropy, potassium-induced depolarization of cells recorded during the subjective night was correlated with a significant increase in mean spike frequency (r = 0.259, P = 0.011) and a decrease in entropy (r = -0.296, P = 0.004). The negative correlation between the entropy and mean spike frequency of cells recorded in vitro was significantly different from that seen in vivo (F = 15.5, P < 0.001), which may reflect differences in the balance between deterministic and stochastic influences on spike occurrence. The study shows that while there is a rhythm of mean spike frequency, parameters based on the variability of interspike interval distributions also display rhythmic changes over the day-night cycle.
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Affiliation(s)
- G S Bhumbra
- Department of Anatomy, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK
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Saeb-Parsy K, Dyball REJ. Responses of cells in the rat supraoptic nucleus in vivo to stimulation of afferent pathways are different at different times of the light/dark cycle. J Neuroendocrinol 2004; 16:131-7. [PMID: 14763999 DOI: 10.1111/j.0953-8194.2004.01142.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [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: 10/26/2022]
Abstract
To determine whether the daily rhythms of spike activity in the supraoptic nucleus (SON) were accompanied by changes in the behaviour of its inputs, we used conventional extracellular single cell recordings from cells in the SON of anaesthetized rats while stimulating the contralateral optic nerve and the ipsilateral suprachiasmatic nucleus (SCN). Neurones in the SON region were identified by antidromic activation and classified as oxytocin or vasopressin cells, on the basis of their spontaneous firing patterns. Approximately 27% of both oxytocin (29/108) and vasopressin (39/147) neurones were excited by stimulation of the optic nerve, and the majority of responses had a long latency (>20 ms). Very few oxytocin (3/108) and vasopressin cells (2/147) were inhibited by stimulation of the optic nerve. The pattern of the responses (excitatory, inhibitory or nonresponsive) of oxytocin and vasopressin cells to stimulation of the optic nerve was significantly related to the time of day (chi-square test; P = 0.012, oxytocin cells; P = 0.006, vasopressin cells). The proportion of oxytocin cells excited by stimulation of the optic nerve was highest at ZT 4-8 and lowest at ZT 20-24. For vasopressin cells, it was highest at ZT 12-16 and lowest at ZT 20-24. The proportion of excitatory, inhibitory and complex responses seen in oxytocin and vasopressin cells following stimulation of the SCN also changed and was significantly different at different times of day (oxytocin cells: highest proportion of excitatory responses at ZT 12-16, P = 0.029; chi-square test; vasopressin cells: highest proportion of excitatory responses at ZT 0-4, P = 0.005; chi-square test). Thus, inputs to oxytocin and vasopressin neurones from the optic nerve and some outputs from the SCN changed during the light/dark cycle. Such changes may contribute to the generation of 24-h rhythms in activity of oxytocin and vasopressin neurones and release of the peptides.
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Affiliation(s)
- K Saeb-Parsy
- Department of Anatomy, University of Cambridge, Cambridge, UK
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28
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Saeb-Parsy K, Dyball REJ. Responses of cells in the rat suprachiasmatic nucleus in vivo to stimulation of afferent pathways are different at different times of the light/dark cycle. J Neuroendocrinol 2003; 15:895-903. [PMID: 12899685 DOI: 10.1046/j.1365-2826.2003.01078.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [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: 11/20/2022]
Abstract
Conventional extracellular recordings were made from single cells in the suprachiasmatic nucleus (SCN) region of the anaesthetized rat. Each cell was tested for its response to stimulation at three sites; the contralateral optic nerve, the ipsilateral supraoptic nucleus (SON) or the ipsilateral arcuate nucleus (ARC) to determine whether the behaviour of the synapses in the SCN was different at different times. Responses to stimulation were tested once each hour and assessed by creating peristimulus time histograms. Excitatory, inhibitory or complex (consisting of more than one component) responses were seen. The responses of some cells that were recorded for several hours changed with time. Changes were seen in the responses of SCN cells to stimulation of the ARC (31/91 cells) and the SON (26/90 cells) regions, but only rarely to stimulation of the optic nerve (2/72 cells). Such differences in proportion are unlikely to have occurred by chance (P < 0.001; chi-square test). Changes seen included the appearance of both excitatory and inhibitory responses in cells that were initially unresponsive. In some cells, one component of a complex response remained constant while another component changed with time. When the cells in the SCN were treated as a group, the proportion of excitatory, inhibitory or complex responses to ARC stimulation did not remain constant throughout the light/dark cycle (P = 0.014; chi-square test). The proportion of excitatory, inhibitory or complex responses to SON and optic nerve stimulation showed no significant variation with the light/dark cycle. If a change in response can be interpreted as a change in the behaviour of a neural connection, the results imply that some of the projections to the SCN from within the hypothalamus change at different times of the light/dark cycle, whereas no change could be seen in the input from the optic nerve. Thus, some of the connections of the SCN appear not to be hard wired, but change rapidly with time.
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Affiliation(s)
- K Saeb-Parsy
- Department of Anatomy, University of Cambridge, Cambridge, UK
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29
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Abstract
The electrical activity of the rat suprachiasmatic nucleus (SCN) was examined in anesthetized rats in vivo using single-unit electrophysiological techniques. The present data confirm the daily variation in the electrical activity of the SCN previously reported in vitro and in vivo using multiple-unit recording techniques. They further suggest that subpopulations of suprachiasmatic neurons with different neural connections have a different daily rhythm of activity. Neurons in the SCN region showed a significant rhythm of activity (p = 0.034; Kruskall-Wallis analysis of variance [KW-ANOVA]). The greatest activity occurred during the second part of the light period (ZT 10-12), and the lowest activity occurred in the early part of the light period (ZT 0-2). The subgroup of cells in the suprachiasmatic region with output projections to the arcuate nucleus (ARC) and/or supraoptic nucleus (SON) regions also showed a significant rhythm (p = 0.001; K-W ANOVA). Their activity appeared to show two peaks near the light-dark (ZT 10-12) and dark-light (ZT 22-24) transition periods with the lowest activity at ZT 16-18. This rhythm was significantly different (p = 0.016) from that of neurons without an output projection to the ARC and/or SON. Retinorecipient suprachiasmatic neurons appeared to have a less robust daily rhythm in their activity. The change in the firing behavior of the cells was not reflected simply by changes in mean firing rate. Examination of the coefficient of variation of the interspike interval distribution of cells at different times of day revealed changes in the firing pattern of cells in the SCN region that did not have output projections (p = 0.032; K-W ANOVA). The present results thus suggest that the SCN is composed of a heterogeneous population of neurons and that different rhythms of activity are expressed by neurons with different neural connections. There were changes in both firing pattern and firing rate.
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Affiliation(s)
- K Saeb-Parsy
- Department of Anatomy, University of Cambridge, Cambridge CB2 3DY, United Kingdom
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O'Toole D, Kelly EJ, McAllister MM, Layton AW, Norrdin RW, Russell WC, Saeb-Parsy K, Walker AP. Hepatic failure and hemochromatosis of Salers and Salers-cross cattle. Vet Pathol 2001; 38:372-89. [PMID: 11467471 DOI: 10.1354/vp.38-4-372] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [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: 01/01/2023]
Abstract
Hemochromatosis is rare in domestic mammals. Five clinical cases and one preclinical case of hemochromatosis were diagnosed in Salers and Salers-cross cattle. Clinical disease developed between 9 and 22 months of age. Animals were healthy until weaning but then lost weight, developed rough hair coats, and lost incisor teeth. In two animals, hemochromatosis was identified by liver biopsy, biochemical evidence of hepatic injury, and/or elevated transferrin saturation values. At necropsy, carcasses were thin, with firm dark brown livers and lymph nodes, soft bones, and brown-colored small bowel. The principal histologic changes were hepatocellular siderosis and periportal, bridging, and perivenular fibrosis. Siderocalcinosis involved collagen, elastin, reticulin, and basement membrane components in liver, lymph nodes, spleen, duodenum, and kidney. Hepatic iron concentrations in clinically affected cattle were 1,500-10,500 microg/g wet weight (reference range for cattle = <300 microg/ g). Ultrastructurally, the heaviest intrahepatic deposition was in hepatocytes, which contained large intracytoplasmic siderosomes. Iron deposition in bone was associated with osteopenia. Genetic analysis indicated a common ancestral bull in the pedigrees of five of six affected cattle; no pedigree was available for the remaining animal. Four dams of five affected animals were phenotypically normal and had histologically normal livers. Test mating of four cows to the ancestral bull resulted in a female calf that developed clinicopathologic and histologic evidence of preclinical hemochromatosis by 40 days of age. It was not possible to establish the pattern of inheritance because of the small number of pedigrees from affected cattle.
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Affiliation(s)
- D O'Toole
- Department of Veterinary Sciences, University of Wyoming, Laramie 82070, USA.
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31
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Affiliation(s)
- R E Dyball
- Department of Anatomy, University of Cambridge, Cambridge CB2 3DY, UK
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32
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Abstract
The secretion of many hormones, including oxytocin, vasopressin and growth hormone, is not constant but shows a day-night rhythm. The suprachiasmatic nucleus (SCN) is thought to generate most mammalian biological rhythms and previous studies have reported suprachiasmatic efferents to the paraventricular nucleus (PVN) and the supraoptic nucleus (SON). We used in vivo extracellular electrophysiological techniques to show that the SCN also sends direct and indirect neural projections to the arcuate nucleus (ARC). This projection consisted of both excitatory and inhibitory components and may contribute to the entrainment of the rhythm in growth hormone secretion to the day-night cycle. Some SCN neurones appear to project to both the SON and the ARC. The SCN in turn receives excitatory and inhibitory inputs from the ARC and the peri-nuclear zone of the SON (peri-SON), which may provide feedback information, as well as allowing nonphotic entrainment of the SCN, for example, in response to feeding. Our data thus suggest extensive two-way connections between the SCN and its target nuclei which may contribute to the generation of day-night neuroendocrine rhythms. They also suggest the existence of indirect retinal projections to the ARC and PVN. We further investigated the retinal projection to the SCN. We were unable to demonstrate a significant difference in retinal input to those suprachiasmatic cells which had efferent projections to particular hypothalamic targets (SON and/or ARC), and those which did not.
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Affiliation(s)
- K Saeb-Parsy
- Department of Anatomy, University of Cambridge, Cambridge UK.
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33
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Abstract
1. In the rat, projections from the suprachiasmatic nucleus (SCN) to the supraoptic nucleus (SON) of the hypothalamus were characterized in vivo using extracellular recordings and in slice preparations using both extracellular and whole-cell patch clamp recording. 2. Of 117 magnocellular neurones recorded in the SON in vivo, fifteen (13%) displayed a short latency excitation, sixty-eight (58%) a short latency inhibition, six (5%) were unresponsive and twenty-eight (24%) gave long latency responses following SCN stimulation. 3. The responses of putative vasopressin cells in the SON to SCN stimulation in vivo (4 out of 61 cells, 7% excited; 49 out of 61 cells, 80% inhibited) were significantly different from those of putative oxytocin cells (10 out of 50 cells, 20% excited and 16 out of 50 cells, 32% inhibited; P < 0.02, test for differences between proportions). 4. Recordings in vitro using patch technology in whole-cell mode showed both inward and outward currents in SON cells at holding potentials near resting membrane potential following stimulation of the SCN region. The outward currents could be blocked by bicuculline (10 microM; n = 7) and the inward currents were blocked by the non-NMDA antagonist 6-nitro-7-sulphamoylbenzo(f)quinoxaline-2,3-dione (5 microM; n = 4). 5. We conclude that there is a strong projection from the SCN to the SON with both inhibitory (GABAergic) and excitatory (glutamatergic) components which may regulate the daily changes in neurohypophysial hormone secretion.
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Affiliation(s)
- L N Cui
- Department of Anatomy, University of Cambridge, UK.
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