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By Y, Le LV, Suy S, Chou M, Chan PL, Heng K, Phou S, Ny C, Deng S, Phoeung CL, Mam S, Ferradini L, Babin FX, Saphonn V. Knowledge, attitudes, practices and prevalence of hepatitis B and C and hepatitis B vaccination coverage among public sector healthcare workers in Cambodia. Glob Health Med 2024; 6:108-116. [PMID: 38690134 PMCID: PMC11043119 DOI: 10.35772/ghm.2023.01097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 11/23/2023] [Accepted: 12/25/2023] [Indexed: 05/02/2024]
Abstract
Healthcare workers (HCWs) are a key population at high risk for hepatitis B (HBV) and hepatitis C (HCV) infections. We aim to study HBV vaccination coverage, seroprevalence, knowledge, attitudes, and practices towards HBV and HCV infections among HCWs in public sector in Cambodia. A nationally representative cross-sectional study was implemented in 2019, among Cambodian HCWs. A standardized questionnaire was administered to randomly selected HCWs whose blood was then sampled. We used univariate and multivariate regression to determine predictors of outcomes. Among 755 participants, we found 4.9% positive HBsAg and 2.3% positive anti-HCV Ab. HBV vaccination coverage was 59.3%. Lack of knowledge was found on the route of transmission, HBV vaccination, diagnosis and treatment of HBV and HCV. 67% of HCWs thought that all patients should be screened for HBV and HCV and about 30% of them would refuse to take care of infected patients. 58% of HCWs always recapped the needle after use. In univariate analysis, older age-group (> 50 years) is more likely to have positive anti-HCV (OR: 9.48; 95% CI: 2.36-38.18). HCWs who were younger, female or having higher education or having ever been tested, were more likely to have gotten HBV vaccinated. Multivariate analysis reconfirmed these predictors of getting vaccinated. Study findings indicated an urgent need of a national policy for Cambodian HCWs given the high prevalence of hepatitis among this group. Policy should include an effective in-service training program to improve knowledge and practices, a testing and vaccination program for HCWs and it should emphasize stigma intervention towards people living with HBV/HCV.
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Affiliation(s)
- Youlet By
- University of Health Sciences, Phnom Penh, Cambodia
- Fondation Mérieux, Phnom Penh, Cambodia
| | - Linh-Vi Le
- World Health Organization Regional Office for the Western Pacific, Manila, Philippines
| | | | | | - Po-lin Chan
- World Health Organization Regional Office for the Western Pacific, Manila, Philippines
| | - Kanika Heng
- University of Health Sciences, Phnom Penh, Cambodia
| | | | - Chanthou Ny
- University of Health Sciences, Phnom Penh, Cambodia
| | | | | | - Sovatha Mam
- University of Health Sciences, Phnom Penh, Cambodia
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Kann S, Sao S, Phoeung C, By Y, Bryant J, Komurian-Pradel F, Saphonn V, Chou M, Turner P. MALDI-TOF mass spectrometry for sub-typing of Streptococcus pneumoniae. BMC Microbiol 2020; 20:367. [PMID: 33261551 PMCID: PMC7709296 DOI: 10.1186/s12866-020-02052-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 11/24/2020] [Indexed: 12/17/2022] Open
Abstract
Background Serotyping of Streptococcus pneumoniae is important for monitoring of vaccine impact. Unfortunately, conventional and molecular serotyping is expensive and technically demanding. This study aimed to determine the ability of matrix-assisted laser desorption-ionisation time-of-flight (MALDI-TOF) mass spectrometry to discriminate between pneumococcal serotypes and genotypes (defined by global pneumococcal sequence cluster, GPSC). In this study, MALDI-TOF mass spectra were generated for a diverse panel of whole genome sequenced pneumococcal isolates using the bioMerieux VITEK MS in clinical diagnostic (IVD) mode. Discriminatory mass peaks were identified and hierarchical clustering was performed to visually assess discriminatory ability. Random forest and classification and regression tree (CART) algorithms were used to formally determine how well serotypes and genotypes were identified by MALDI-TOF mass spectrum. Results One hundred and ninety-nine pneumococci, comprising 16 serotypes and non-typeable isolates from 46 GPSC, were analysed. In the primary experiment, hierarchical clustering revealed poor congruence between MALDI-TOF mass spectrum and serotype. The correct serotype was identified from MALDI-TOF mass spectrum in just 14.6% (random forest) or 35.4% (CART) of 130 isolates. Restricting the dataset to the nine dominant GPSC (61 isolates / 13 serotypes), discriminatory ability improved slightly: the correct serotype was identified in 21.3% (random forest) and 41.0% (CART). Finally, analysis of 69 isolates of three dominant serotype-genotype pairs (6B-GPSC1, 19F-GPSC23, 23F-GPSC624) resulted in the correct serotype identification in 81.1% (random forest) and 94.2% (CART) of isolates. Conclusions This work suggests that MALDI-TOF is not a useful technique for determination of pneumococcal serotype. MALDI-TOF mass spectra appear more associated with isolate genotype, which may still have utility for future pneumococcal surveillance activities. Supplementary Information The online version contains supplementary material available at 10.1186/s12866-020-02052-7.
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Affiliation(s)
- Sivkheng Kann
- Rodolphe Mérieux Laboratory, University of Health Sciences, Phnom Penh, Cambodia
| | - Sena Sao
- Cambodia Oxford Medical Research Unit, Angkor Hospital for Children, PO Box 50, Siem Reap, Cambodia
| | - Chanleakhena Phoeung
- Rodolphe Mérieux Laboratory, University of Health Sciences, Phnom Penh, Cambodia
| | - Youlet By
- Rodolphe Mérieux Laboratory, University of Health Sciences, Phnom Penh, Cambodia.,Fondation Mérieux, Phnom Penh, Cambodia
| | - Juliet Bryant
- Fondation Mérieux and Centre International de Recherche en Infectiologie (CIRI), INSERM, Lyon, France
| | - Florence Komurian-Pradel
- Fondation Mérieux and Centre International de Recherche en Infectiologie (CIRI), INSERM, Lyon, France
| | | | - Monidarin Chou
- Rodolphe Mérieux Laboratory, University of Health Sciences, Phnom Penh, Cambodia
| | - Paul Turner
- Cambodia Oxford Medical Research Unit, Angkor Hospital for Children, PO Box 50, Siem Reap, Cambodia. .,Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK.
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Reed TAN, Krang S, Miliya T, Townell N, Letchford J, Bun S, Sar B, Osbjer K, Seng S, Chou M, By Y, Vanchinsuren L, Nov V, Chau D, Phe T, de Lauzanne A, Ly S, Turner P. Antimicrobial resistance in Cambodia: a review. Int J Infect Dis 2019; 85:98-107. [PMID: 31176035 DOI: 10.1016/j.ijid.2019.05.036] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 05/31/2019] [Accepted: 05/31/2019] [Indexed: 02/01/2023] Open
Abstract
OBJECTIVES Following the launch of the Global Antimicrobial Resistance Surveillance System (GLASS), antimicrobial resistance (AMR) rates in many countries remain poorly described. This review provides an overview of published AMR data from Cambodia in the context of recently initiated national human and food-animal surveillance. METHODS PubMed and the Cochrane Database of Systematic Reviews were searched for articles published from 2000 to 2018, which reported antimicrobial susceptibility testing (AST) data for GLASS specific organisms isolated from Cambodia. Articles were screened using strict inclusion/exclusion criteria. AST data was extracted, with medians and ranges of resistance rates calculated for specific bug-drug combinations. RESULTS Twenty-four papers were included for final analysis, with 20 describing isolates from human populations. Escherichia coli was the most commonly described organism, with median resistance rates from human isolates of 92.8% (n=6 articles), 46.4% (n=4), 55.4% (n=8), and 46.4% (n=5) to ampicillin, 3rd generation cephalosporins, fluoroquinolones, and gentamicin respectively. CONCLUSIONS Whilst resistance rates are high for several GLASS organisms, there were insufficient data to draw robust conclusions about the AMR situation in Cambodia. The recently implemented national AMR surveillance systems will begin to address this data gap.
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Affiliation(s)
- Thomas A N Reed
- Cambodia-Oxford Medical Research Unit, Angkor Hospital for Children, Siem Reap, Cambodia
| | - Sidonn Krang
- Department of Communicable Diseases Control, Ministry of Health, Phnom Penh, Cambodia
| | - Thyl Miliya
- Cambodia-Oxford Medical Research Unit, Angkor Hospital for Children, Siem Reap, Cambodia
| | - Nicola Townell
- Diagnostic Microbiology Development Program, Phnom Penh, Cambodia
| | - Joanne Letchford
- Diagnostic Microbiology Development Program, Phnom Penh, Cambodia
| | - Sreng Bun
- United States Centers for Disease Control and Prevention, Phnom Penh, Cambodia
| | - Borann Sar
- United States Centers for Disease Control and Prevention, Phnom Penh, Cambodia
| | - Kristina Osbjer
- Food and Agriculture Organisation of the United Nations, Phnom Penh, Cambodia
| | - Sokerya Seng
- Food and Agriculture Organisation of the United Nations, Phnom Penh, Cambodia
| | - Monidarin Chou
- Faculty of Pharmacy, University of Health Sciences, Phnom Penh, Cambodia
| | - Youlet By
- Fondation Mérieux, Phnom Penh, Cambodia
| | | | - Vandarith Nov
- National Institute of Public Health, Phnom Penh, Cambodia
| | - Darapheak Chau
- National Institute of Public Health, Phnom Penh, Cambodia
| | - Thong Phe
- Sihanouk Hospital Center of Hope, Phnom Penh, Cambodia
| | | | - Sovann Ly
- Department of Communicable Diseases Control, Ministry of Health, Phnom Penh, Cambodia
| | - Paul Turner
- Cambodia-Oxford Medical Research Unit, Angkor Hospital for Children, Siem Reap, Cambodia; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK.
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Inghammar M, By Y, Farris C, Phe T, Borand L, Kerleguer A, Goyet S, Saphonn V, Phoeung C, Vong S, Rammaert B, Mayaud C, Guillard B, Yasuda C, Kasper MR, Ford G, Newell SW, An US, Sokhal B, Touch S, Turner P, Jacobs J, Messaoudi M, Komurian-Pradel F, Tarantola A. Serotype Distribution of Clinical Streptococcus pneumoniae Isolates before the Introduction of the 13-Valent Pneumococcal Conjugate Vaccine in Cambodia. Am J Trop Med Hyg 2018; 98:791-796. [PMID: 29313476 PMCID: PMC5930902 DOI: 10.4269/ajtmh.17-0692] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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] [Indexed: 01/05/2023] Open
Abstract
Childhood vaccination with the 13-valent pneumococcal conjugate vaccine (PCV13) was introduced in Cambodia in January 2015. Baseline data regarding circulating serotypes are scarce. All microbiology laboratories in Cambodia were contacted for identification of stored isolates of Streptococcus pneumoniae from clinical specimens taken before the introduction of PCV13. Available isolates were serotyped using a multiplex polymerase chain reaction method. Among 166 identified isolates available for serotyping from patients with pneumococcal disease, 4% were isolated from upper respiratory samples and 80% were from lower respiratory samples, and 16% were invasive isolates. PCV13 serotypes accounted for 60% (95% confidence interval [CI] 52–67) of all isolates; 56% (95% CI 48–64) of noninvasive and 77% (95% CI 57–89) of invasive isolates. Antibiotic resistance was more common among PCV13 serotypes. This study of clinical S. pneumoniae isolates supports the potential for high reduction in pneumococcal disease burden and may serve as baseline data for future monitoring of S. pneumoniae serotypes circulation after implementation of PCV13 childhood vaccination in Cambodia.
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Affiliation(s)
- Malin Inghammar
- Section for Infection Medicine, Department of Clinical Sciences Lund, Lund University, Skane University Hospital, Lund, Sweden.,Institut Pasteur du Cambodge, Phnom Penh, Cambodia
| | - Youlet By
- University of Health Science, Phnom Pen, Cambodia.,Fondation Mérieux, Phnom Penh, Cambodia
| | | | - Thong Phe
- Sihanouk Hospital Center of Hope, Phnom Penh, Cambodia
| | | | | | - Sophie Goyet
- Institut Pasteur du Cambodge, Phnom Penh, Cambodia
| | | | | | - Sirenda Vong
- Institut Pasteur du Cambodge, Phnom Penh, Cambodia
| | - Blandine Rammaert
- CHU de Poitiers, Service de Maladies Infectieuses et Tropicales, INSERM U1070, Université de Poitiers, Poitiers, France
| | | | | | | | | | - Gavin Ford
- Naval Medical Research Unit No. 2, Phnom Penh, Cambodia
| | | | - Ung Sam An
- Cambodian National Laboratory of Public Health, Phnom Penh, Cambodia
| | - Buth Sokhal
- Cambodian National Laboratory of Public Health, Phnom Penh, Cambodia
| | - Sok Touch
- Cambodian Communicable Disease Control Department, Phnom Penh, Cambodia
| | - Paul Turner
- Nuffield Department of Medicine, Centre for Tropical Medicine and Global Health, University of Oxford, Oxford, United Kingdom.,Cambodia Oxford Medical Research Unit, Siem Reap, Cambodia
| | - Jan Jacobs
- Department of Microbiology and Immunology, KU Leuven, Leuven, Belgium.,Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium.,Sihanouk Hospital Center of Hope, Phnom Penh, Cambodia
| | - Mélina Messaoudi
- Emerging Pathogens Laboratory, Fondation Mérieux, Centre International de Recherche en Infectiologie, INSERM U1111, Lyon, France
| | - Florence Komurian-Pradel
- Emerging Pathogens Laboratory, Fondation Mérieux, Centre International de Recherche en Infectiologie, INSERM U1111, Lyon, France
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Walther BA, Boëte C, Binot A, By Y, Cappelle J, Carrique-Mas J, Chou M, Furey N, Kim S, Lajaunie C, Lek S, Méral P, Neang M, Tan BH, Walton C, Morand S. Biodiversity and health: Lessons and recommendations from an interdisciplinary conference to advise Southeast Asian research, society and policy. Infect Genet Evol 2016; 40:29-46. [PMID: 26903421 DOI: 10.1016/j.meegid.2016.02.003] [Citation(s) in RCA: 25] [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] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 02/03/2016] [Accepted: 02/04/2016] [Indexed: 01/01/2023]
Abstract
Southeast Asia is an economic, biodiverse, cultural and disease hotspot. Due to rapid socio-economic and environmental changes, the role of biodiversity and ecosystems for human health ought to be examined and communicated to decision-makers and the public. We therefore summarized the lessons and recommendations from an interdisciplinary conference convened in Cambodia in 2014 to advise Southeast Asian societies on current research efforts, future research needs, and to provide suggestions for improved education, training and science-policy interactions. First, we reviewed several examples of the important role of ecosystems as 'sentinels' in the sense that potentially harmful developments for human health become first apparent in ecosystem components. Other ecosystem services which also benefit human well-being are briefly summarized. Second, we summarized the recommendations of the conference's roundtable discussions and added recent developments in the science-policy interface. The recommendations were organized along five themes: Ethical and legal considerations; implementation of the One Health approach; education, training, and capacity building; future research priorities; and potential science-policy interactions. While the role of biodiversity for human health needs further research, especially for zoonoses and emerging diseases, many direct and indirect benefits to human health are already apparent, but have yet to filter down to the science-policy interface in order to influence legislation and enforcement. Therefore, efforts to strengthen the interface in Southeast Asia should become a high priority in order to strengthen the health and resilience of Southeast Asian societies.
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Affiliation(s)
- Bruno Andreas Walther
- Master Program in Global Health and Development, College of Public Health and Nutrition, Taipei Medical University, 250 Wu-Hsing St., Taipei 110, Taiwan, R.O.C.
| | - Christophe Boëte
- UMR_D 190 Unité des Virus Emergents Aix-Marseille Université - Institut de Recherche pour le Développement - Ecole des Hautes Etudes en Santé Publique, 27 Bd Jean Moulin, 13005, Marseille cedex 05, France
| | - Aurélie Binot
- CIRAD-ES, UPR AGIRs, F-34398, Montpellier, France; Kasetsart University, Faculty of Veterinary Medicine, Bangkok, Thailand
| | - Youlet By
- Fondation Mérieux, 73 Boulevard Monivong, Phnom Penh, Cambodia
| | - Julien Cappelle
- CIRAD-ES, UPR AGIRs, F-34398, Montpellier, France; Institut Pasteur du Cambodge, Epidemiology and Public Health Unit, BP, 983, Phnom Penh, Cambodia
| | - Juan Carrique-Mas
- Hospital for Tropical Diseases, Oxford University Clinical Research Unit - Wellcome Trust Major Overseas Programme, 764 Vo Van Kiet, District 5, Ho Chi Minh City, Vietnam; Centre for Tropical Medicine, Nuffield Department of Clinical Medicine, Oxford University, Old Road Campus Oxford, OX3 7BN, United Kingdom
| | - Monidarin Chou
- University of Health Sciences, 73 Boulevard Monivong, Phnom Penh, Cambodia
| | - Neil Furey
- Fauna & Flora International, PO Box 1380, No. 19, Street 360, Boeng Keng Kang 1, Phnom Penh, Cambodia, 12000
| | - Sothea Kim
- University of Health Sciences, 73 Boulevard Monivong, Phnom Penh, Cambodia
| | - Claire Lajaunie
- UMR URMITE, U1095 INSERM - Aix-Marseille Université - Institut de Recherche pour le Développement - CNRS, 27 Bd Jean Moulin, 13385, Marseille cedex 05, France
| | - Sovan Lek
- Université de Toulouse, Lab. Evolution & Diversité Biologique, UMR 5174 CNRS - Université Paul Sabatier, 118 route de Narbonne, 31062, Toulouse cedex 9, France
| | - Philippe Méral
- UMR GRED (IRD - University Paul Valery Montpellier 3), 911 av. agropolis, BP, 64501 34 394 Montpellier Cedex 5, France; Ecoland Research Centre - Royal University of Agriculture (RUA) Faculty of Agricultural Economics and Rural Development Dangkor district, Phnom Penh, Cambodia
| | - Malyne Neang
- Ecoland Research Centre - Royal University of Agriculture (RUA) Faculty of Agricultural Economics and Rural Development Dangkor district, Phnom Penh, Cambodia
| | - Boon-Huan Tan
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Republic of Singapore
| | - Catherine Walton
- Faculty of Life Sciences, University of Manchester, Manchester M13 9PL, UK
| | - Serge Morand
- CIRAD-ES, UPR AGIRs, F-34398, Montpellier, France; CNRS, Centre d'Infectiologie Christophe Mérieux du Laos, Vientiane, Laos; Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
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Regaya I, Aidi-Knani S, By Y, Carrega L, Condo J, Ruf J, Gerolami V, Berge-Lefranc JL, Ben Hamida J, Sabatier JM, Guieu R. 44. Effect of small conductance calcium-activated potassium channels blockers on adenosine receptor expression in Jurkat cells. Toxicon 2014. [DOI: 10.1016/j.toxicon.2014.08.052] [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: 11/30/2022]
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Bruzzese L, Fromonot J, By Y, Durand-Gorde JM, Condo J, Kipson N, Guieu R, Fenouillet E, Ruf J. NF-κB enhances hypoxia-driven T-cell immunosuppression via upregulation of adenosine A(2A) receptors. Cell Signal 2014; 26:1060-7. [PMID: 24486403 DOI: 10.1016/j.cellsig.2014.01.024] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 01/20/2014] [Accepted: 01/24/2014] [Indexed: 10/25/2022]
Abstract
Hypoxia affects inflammation by modulating T-cell activation via the adenosinergic system. We supposed that, in turn, inflammation influences cell hypoxic behavior and that stimulation of T-cells in inflammatory conditions involves the concerted action of the nuclear factor κB (NF-κB) and the related hypoxia-inducible factor 1α (HIF-1α) on the adenosinergic system. We addressed this hypothesis by monitoring both transcription factors and four adenosinergic signaling parameters - namely adenosine, adenosine deaminase (ADA), adenosine A2A receptor (A2AR) and cAMP - in T-cells stimulated using phorbol myristate acetate and phytohemagglutinin and submitted to hypoxic conditions which were mimicked using CoCl2 treatment. We found that cell viability was more altered in stimulated than in resting cells under hypoxia. Detailed analysis showed that: i) NF-κB activation remained at basal level in resting hypoxic cells but greatly increased following stimulation, stimulated hypoxic cells exhibiting the higher level; ii) HIF-1α production induced by hypoxia was boosted via NF-κB activation in stimulated cells whereas hypoxia increased HIF-1α production in resting cells without further activating NF-κB; iii) A2AR expression and cAMP production increased in stimulated hypoxic cells whereas adenosine level remained unchanged due to ADA regulation; and iv) the presence of H2S, an endogenous signaling molecule in inflammation, reversed the effect of stimulation on cell viability by down-regulating the activity of transcription factors and adenosinergic immunosuppression. We also found that: i) the specific A2AR agonist CGS-21680 increased the suppressive effect of hypoxia on stimulated T-cells, the antagonist ZM-241385 exhibiting the opposite effect; and ii) Rolipram, a selective inhibitor of cAMP-specific phosphodiesterase 4, and 8-Br-cAMP, a cAMP analog which preferentially activates cAMP-dependent protein kinase A (PKA), increased T-cell immunosuppression whereas H-89, a potent and selective inhibitor of cAMP-dependent PKA, restored cell viability. Together, these data indicate that inflammation enhances T-cell sensitivity to hypoxia via NF-κB activation. This process upregulates A2AR expression and enhances cAMP production and PKA activation, resulting in adenosinergic T-cell immunosuppression that can be modulated via H2S.
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Affiliation(s)
- Laurie Bruzzese
- Aix-Marseille Université (AMU) and Institut de Recherche Biomédicale des Armées (IRBA), UMR MD2, Faculté de Médecine Nord, Marseille, France
| | - Julien Fromonot
- Aix-Marseille Université (AMU) and Institut de Recherche Biomédicale des Armées (IRBA), UMR MD2, Faculté de Médecine Nord, Marseille, France
| | - Youlet By
- Aix-Marseille Université (AMU) and Institut de Recherche Biomédicale des Armées (IRBA), UMR MD2, Faculté de Médecine Nord, Marseille, France
| | - Josée-Martine Durand-Gorde
- Aix-Marseille Université (AMU) and Institut de Recherche Biomédicale des Armées (IRBA), UMR MD2, Faculté de Médecine Nord, Marseille, France
| | - Jocelyne Condo
- Aix-Marseille Université (AMU) and Institut de Recherche Biomédicale des Armées (IRBA), UMR MD2, Faculté de Médecine Nord, Marseille, France
| | - Nathalie Kipson
- Aix-Marseille Université (AMU) and Institut de Recherche Biomédicale des Armées (IRBA), UMR MD2, Faculté de Médecine Nord, Marseille, France
| | - Régis Guieu
- Aix-Marseille Université (AMU) and Institut de Recherche Biomédicale des Armées (IRBA), UMR MD2, Faculté de Médecine Nord, Marseille, France
| | - Emmanuel Fenouillet
- Aix-Marseille Université (AMU) and Institut de Recherche Biomédicale des Armées (IRBA), UMR MD2, Faculté de Médecine Nord, Marseille, France; Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Biologiques, France
| | - Jean Ruf
- Aix-Marseille Université (AMU) and Institut de Recherche Biomédicale des Armées (IRBA), UMR MD2, Faculté de Médecine Nord, Marseille, France; Institut National de la Santé et de la Recherche Médicale (INSERM), France.
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Regaya I, Aidi-Knani S, By Y, Condo J, Gerolami V, Berge-Lefranc JL, Ben Hamida J, Sabatier JM, Fenouillet E, Guieu R, Ruf J. SKCa Channels Blockage Increases the Expression of Adenosine A2A Receptor in Jurkat Human T Cells. Biores Open Access 2013; 2:163-8. [PMID: 23593569 PMCID: PMC3620471 DOI: 10.1089/biores.2012.0282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Adenosine is a nucleoside displaying various biological effects via stimulation of four G-protein-coupled receptors, A1, A2A, A2B, and A3. Adenosine also modulates voltage-gated (Kv) and small conductance calcium-activated (SKCa) potassium channels. The effect of these potassium channels on the expression of adenosine receptors is poorly understood. We evaluated the action of BgK (a natural Kv channel blocker) and Lei-Dab7 (a synthetic SKCa channel blocker) on the expression of adenosine A2A receptors (A2AR) in Jurkat human T cells. We found that Lei-Dab7, but not BgK, increased the maximal binding value of the tritiated ligand ZM241385 to A2AR in a dose-dependent manner (+45% at 5 nM; +70% at 50 nM as compared to control). These results were further confirmed by Western blotting using a specific monoclonal antibody to human A2AR. The ligand affinity-related dissociation constant and A2AR mRNA amount were not significantly modified by either drug. We suggest that modulation of SKCa channels can influence membrane expression of A2AR and thus has a therapeutic potential.
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Affiliation(s)
- Imed Regaya
- Unit of Functional Proteomics and Organic Food Preservation, Higher Institute of Applied Biological Sciences of Tunis, University of Tunis El Manar , Tunis, Tunisia . ; Higher Institute of Environmental Sciences and Technologies, University of Carthage , Carthage, Tunisia
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Franceschi F, By Y, Peyrouse E, Fromonot J, Gerolami V, Kipson N, Boussuges A, Brignole M, Fenouillet E, Deharo JC, Ruf J, Guieu R. A2A adenosine receptor function in patients with vasovagal syncope. Europace 2013; 15:1328-32. [PMID: 23594931 DOI: 10.1093/europace/eut066] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
AIMS Adenosine is a possible mediator in vasovagal syncope (VVS) via the activation of its receptors. High expression of adenosine A2A receptors (A2AR) has been reported in VVS. The function of these over-expressed receptors in this population has never been evaluated. METHODS AND RESULTS We used Adonis, a specific-made antibody with A2AR agonist properties, to evaluate binding parameters (i.e. dissociation constant KD) and cAMP production (i.e. EC50) by peripheral blood mononuclear cells of 16 VVS patients. Eight healthy volunteers served as controls. A2AR expression was higher in patients than controls; mean: 11.5 ± 1.2 vs. 7.7 ± 0.8 AU, P = 0.04. Also, KD values were higher in patients than controls: 2.1 ± 0.02 × 10(-7) vs. 5 ± 1 × 10(-8) M, P < 0.01 In controls, KD values were lower than EC50 (5 ± 1.7 × 10(-8) vs. 2.8 ± 0.4 10(-7) M, P < 0.01), but in patients, KD values did not differ from EC50: 2. ± 0.2 × 10(-7) vs. 2.5 ± 0.4 × 10(-7) M, P > 0.05. However, four patients had lower EC50 (3.5 ± 0.3 × 10(-8) M) than KD (2.9 ± 1.2 × 10(-7) M; KD/EC50 = 9.6), suggesting the presence of spare receptors. CONCLUSION The function of A2AR of patients with VVS was preserved since their stimulation by Adonis led to cAMP production with an EC50 comparable with those in controls. However, their affinity was lower than those of controls. Our results suggest that A2AR are implicated in the physiopathology of VVS.
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Affiliation(s)
- F Franceschi
- UMR MD2, Aix Marseille University AMU, Bvd P Dramard 13015, Marseille, France
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Jacquin L, Franceschi F, By Y, Durand-Gorde JM, Condo J, Deharo JC, Michelet P, Fenouillet E, Guieu R, Ruf J. Search for adenosine A2A spare receptors on peripheral human lymphocytes. FEBS Open Bio 2012; 3:1-5. [PMID: 23847753 PMCID: PMC3668538 DOI: 10.1016/j.fob.2012.11.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Revised: 11/12/2012] [Accepted: 11/13/2012] [Indexed: 12/20/2022] Open
Abstract
Some ligand–receptor couples involve spare receptors, which are apparent when a maximal response is achieved with only a small fraction of the receptor population occupied. This situation favours cross-reactions with low-affinity ligands, which may be detrimental for cell signaling. In the case of the adenosine A2A receptors (A2AR), which have an immunosuppressive effect on lymphocytes through cAMP production, the presence of spare A2AR remains to be established. We examined the situation using patients over-expressing lymphocyte A2AR and an agonist-like mAb to A2AR. We found that maximal mAb binding and functional response varied among the patients whereas the dissociation constant and half-maximal effective concentration had similar mean values (0.19 and 0.18 μM, respectively). Lymphocyte A2AR expression was correlated to plasma adenosine level and A2AR occupation but not to A2AR response. These results are consistent with a lack of a reserve of functional A2AR on human lymphocytes as a general rule and suggest that the amount and functional state of the expressed A2AR determine the maximal level of the lymphocyte response to adenosine.
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Affiliation(s)
- Laurent Jacquin
- Aix-Marseille Université, UMR MD2, Faculté de Médecine Nord, Marseille, France
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Deharo JC, Mechulan A, Giorgi R, Franceschi F, Prevot S, Peyrouse E, Condo J, By Y, Ruf J, Brignole M, Guieu R. Adenosine plasma level and A2A adenosine receptor expression: correlation with laboratory tests in patients with neurally mediated syncope. Heart 2012; 98:855-9. [PMID: 22581734 DOI: 10.1136/heartjnl-2011-301411] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
OBJECTIVES The purpose of this study was to investigate the hypothesis that responses to the ATP test and head-up tilt test (HUT) may be correlated with different purinergic profiles. DESIGN AND SETTING The ATP and HUT identify distinct subsets of patients with neurally mediated syncope (NMS). Adenosine and its A(2A) receptors (A(2A)R) may be implicated in the pathophysiology of NMS in patients with positive HUT. Nothing is known about the purinergic profile of patients with positive ATP. PATIENTS AND MEASURES: This prospective study includes a consecutive series of patients with suspected NMS. All patients underwent both HUT and ATP. Before testing, samples were collected for measurement of baseline adenosine plasma level (APL) and expression. RESULTS A total of 46 patients (25 men and 21 women) with a mean age of 57±18 years were enrolled. The HUT test was positive in 27 patients and the ATP test in 20. Both tests were positive in 9 and negative in 8. High APL was associated with high probability of positive HUT while low APL was associated with high probability of positive ATP. Expression of A(2A)R was lower in patients with positive ATP than in those with positive HUT. CONCLUSION These findings indicate that patients with NMS present different purinergic profiles and that responses to HUT and ATP are correlated with these profiles.
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Affiliation(s)
- Jean-Claude Deharo
- Department of Cardiology, CHU La Timone, 264, Rue Saint Pierre, 13005 Marseille, France.
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Jammes Y, Steinberg JG, By Y, Brerro-Saby C, Condo J, Olivier M, Guieu R, Delliaux S. Fatiguing stimulation of one skeletal muscle triggers heat shock protein activation in several rat organs: the role of muscle innervation. ACTA ACUST UNITED AC 2012; 215:4041-8. [PMID: 22899526 DOI: 10.1242/jeb.074427] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We hypothesised that activation of muscle afferents by fatigue triggers a widespread activation of heat shock proteins (HSPs) in resting muscles and different organs. In anaesthetised rats, HSP25 and HSP70 levels were determined in both tibialis anterior (TA) and extensor digitorum longus (EDL) muscles and in the diaphragm, kidney and brain by ELISA, which mostly identifies phosphorylated HSP, and western blotting. One TA muscle was electrically stimulated and tissues were sampled 10 or 60 min after the stimulation had ended. The nerve supply to the stimulated TA or its counterpart in the contralateral limb was left intact or suppressed. In control rats, no muscle stimulation was performed and tissues were sampled at the same time points (10 or 60 min). After TA stimulation, ELISA showed an increased HSP25 content in the contralateral TA, EDL and diaphragm at 10 min but not at 60 min, and HSP70 increased in all sampled tissues at 60 min. Western blotting did not show any changes in HSP25 and HSP70 at 10 min, while at 60 min HSP25 increased in all sampled tissues except the brain and HSP70 was elevated in all tissues. Denervation of the contralateral non-stimulated limb suppressed HSP changes in TA and after denervation of the stimulated TA the widespread activation of HSPs in other organs was absent. Our data suggest that fatigue-induced activation of skeletal muscle afferents triggers an early increase in phosphorylated HSP25 in muscles and a delayed elevation of non-phosphorylated HSP25 and HSP70 in skeletal and respiratory muscles, kidney and brain.
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Affiliation(s)
- Yves Jammes
- UMR MD2, Faculty of Medicine, Aix-Marseille University, Marseille, France.
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Guieu R, Guedj E, Giorgi R, Dousset A, Tuzzolino V, By Y, Leveque JM, Peragut JC, Régis J, Ruf J, Fenouillet E, Roussel P. High cell surface CD26-associated activities and low plasma adenosine concentration in fibromyalgia. Ann Rheum Dis 2012; 71:1427-8. [DOI: 10.1136/annrheumdis-2011-201174] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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By Y, Jacquin L, Franceschi F, Durand-Gorde JM, Condo J, Michelet P, Guieu R, Ruf J. Fall in oxygen tension of culture medium stimulates the adenosinergic signalling of a human T cell line. Purinergic Signal 2012; 8:661-7. [PMID: 22331499 DOI: 10.1007/s11302-012-9295-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Accepted: 02/01/2012] [Indexed: 10/28/2022] Open
Abstract
We examined the short-course expression of various parameters involved in the adenosinergic signalling of a human T cell line during in vitro decrease of the medium culture oxygen tension mimicking in vivo hypoxia. Fall of 92 mmHg in oxygen tension of culture medium induced in CEM, a CD4+ human T cell line, a continuous production of hypoxia-inducing factor-1α with a plateau value at 9 h, a rapid increase in adenosine production peaking at 3 h and a decrease in adenosine deaminase peaking at 6 h. The adenosine A(2A) receptor (A(2A)R) protein level of CEM cells was enhanced with a peak at 6 h. Intracellular 3',5'-cyclic adenosine monophosphate accumulated in CEM cells with a maximal level at 9 h. These results show that a human-cultured T cells line can upregulate its own adenosine production and A(2A)R expression during exposure to acute hypoxia. Hypoxia-increased stimulation of the adenosinergic signalling of T cells may have immunosuppressive properties and, consequently, A(2A)R agonists may have therapeutic relevance.
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Affiliation(s)
- Youlet By
- UMR MD2 P2COE, Aix-Marseille Univ, Faculté de Médecine, Timone, 27, Boulevard Jean Moulin, F-13385, Marseille Cedex 5, France
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15
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Kerbaul F, By Y, Gariboldi V, Mekkaoui C, Fesler P, Collart F, Brimioulle S, Jammes Y, Ruf J, Guieu R. Acute pulmonary embolism decreases adenosine plasma levels in anesthetized pigs. ISRN Cardiol 2011; 2011:750301. [PMID: 22347654 PMCID: PMC3262497 DOI: 10.5402/2011/750301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Accepted: 03/30/2011] [Indexed: 11/26/2022]
Abstract
Adenosine plays a role in pulmonary arterial (PA) resistance due to its vasodilator properties. However, the behavior of adenosine plasma levels (APLs) during pulmonary embolism remains unknown. We investigated the effects of gradual pulmonary embolism on right ventricular (RV) contractility and PA coupling and on APLs in an piglet experimental model of RV failure. PA distal resistance by pressure-flow relationships and pulmonary vascular impedance were measured. RV contractility was determined by the end-systolic pressure-volume relationship (Ees), PA effective elastance by the end-diastolic to end-systolic relationship (Ea), and RV-PA coupling efficiency by the Ees/Ea ratio. APLs were measured before and during gradual pulmonary embolization. PA embolism increased PA resistance and elastance, increased Ea from 1.08 ± 0.15
to 5.62 ± 0.32 mmHg/mL, decreased Ees from 1.82 ± 0.10 to 1.20 ± 0.23 mmHg/mL, and decreased Ees/Ea from 1.69 ± 0.15 to 0.21 ± 0.07. APLs decreased from 2.7 ± 0.26 to 1.3 ± 0.12 μM in the systemic bed and from 4.03 ± 0.63 to 2.51 ± 0.58 μM in the pulmonary bed during embolism procedure. Pulmonary embolism worsens PA hemodynamics and RV-PA coupling. APLs were reduced, both in the systemic and in the pulmonary bed, leading then to pulmonary vasoconstriction.
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Affiliation(s)
- François Kerbaul
- Laboratory of Hemodynamic and Cardiovascular Mechanisms, and Departments of Intensive Care, AP-HM, 13385 Marseille Cedex 05, France
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By Y, Condo J, Durand-Gorde JM, Lejeune PJ, Mallet B, Guieu R, Ruf J. Intracerebroventricular injection of an agonist-like monoclonal antibody to adenosine A2A receptor has antinociceptive effects in mice. J Neuroimmunol 2011; 230:178-82. [DOI: 10.1016/j.jneuroim.2010.07.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2010] [Revised: 07/21/2010] [Accepted: 07/27/2010] [Indexed: 10/19/2022]
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By Y, Durand-Gorde JM, Condo J, Lejeune PJ, Fenouillet E, Guieu R, Ruf J. Monoclonal antibody–assisted stimulation of adenosine A2A receptors induces simultaneous downregulation of CXCR4 and CCR5 on CD4+ T-cells. Hum Immunol 2010; 71:1073-6. [DOI: 10.1016/j.humimm.2010.08.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Revised: 07/29/2010] [Accepted: 08/16/2010] [Indexed: 01/09/2023]
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Mathew SC, By Y, Berthault A, Virolleaud MA, Carrega L, Chouraqui G, Commeiras L, Condo J, Attolini M, Gaudel-Siri A, Ruf J, Rodriguez J, Parrain JL, Guieu R. Expeditious synthesis and biological evaluation of new C-6 1,2,3-triazole adenosine derivatives A1 receptor antagonists or agonists. Org Biomol Chem 2010; 8:3874-81. [PMID: 20617271 DOI: 10.1039/c0ob00017e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The synthesis of new C-6 1,2,3-triazole adenosine derivatives via microwave assisted 1,3-dipolar cycloaddition as key step is described. The binding on membranes of cells that over express A(1) adenosine receptors (A(1)AR) was also evaluated. Among them, four compounds increased cAMP production, in a dose-dependent manner acting as antagonists of the A(1)AR, while two compounds act as agonists.
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Affiliation(s)
- Smitha C Mathew
- Aix-Marseille Université, Institut des Sciences Moléculaires de Marseille, iSm2-UMR CNRS 6263, Centre Saint Jérôme, Service 532, 13397, Marseille Cedex 20, France
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Saadjian AY, Gerolami V, Giorgi R, Mercier L, Berge-Lefranc JL, Paganelli F, Ibrahim Z, By Y, Gueant JL, Levy S, Guieu RP. Head-up tilt induced syncope and adenosine A2A receptor gene polymorphism. Eur Heart J 2009; 30:1510-5. [DOI: 10.1093/eurheartj/ehp126] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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By Y, Durand-Gorde JM, Condo J, Lejeune PJ, Mallet B, Carayon P, Guieu R, Ruf J. Production of an agonist-like monoclonal antibody to the human A2A receptor of adenosine for clinical use. Mol Immunol 2008; 46:400-5. [PMID: 19041138 DOI: 10.1016/j.molimm.2008.10.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2008] [Revised: 10/13/2008] [Accepted: 10/14/2008] [Indexed: 10/21/2022]
Abstract
The second extracellular loop of the A(2A) receptor (A(2A)R) of adenosine was used to immunize mice for production of Adonis, an IgM monoclonal antibody. Adonis bound to the immunogen peptide and the native receptor in ELISA with K(D) values in 6.51-12.35 nM range. It recognized a linear epitope of 7 amino acids (LFEDVVP) at the C-terminal part of the external loop. Adonis revealed a 45-kDa band in lysate of human peripheral blood mononuclear cells in Western blotting in denaturing conditions. This served to monitor the up-regulation of the A(2A)R expression by caffeine. Adonis stimulated the cAMP production and inhibited the cell proliferation of an A(2A)R transfected stable cell line. These results confirm the immunogenicity and the functional relevance of the second extracellular loop of the A(2A)R. They suggest that Adonis may be of clinical use in various pathological situations to measure the regulation of the A(2A)R expression and to act as A(2A)R agonist drug.
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Affiliation(s)
- Youlet By
- Laboratoire de Biochimie Endocrinienne et Métabolique (EA3288), Université de la Méditerranée, Faculté de Médecine Timone, Marseille, France
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Franceschi F, Deharo JC, Giorgi R, By Y, Monserrat C, Condo J, Ibrahim Z, Saadjian A, Guieu R. Peripheral plasma adenosine release in patients with chronic heart failure. Heart 2008; 95:651-5. [DOI: 10.1136/hrt.2008.155242] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Kerbaul F, Collard F, Benard F, By Y, Paganelli F, Saadjian A, Ruf J, Lejeune PJ, Mallet B, Carrega L, Zouher I, Monserrat C, Bonnet JL, Guieu R. Release of Markers of Myocardial Damage Evaluated in the Coronary Sinus During Cardiac Surgery. J Investig Med 2007; 55:195-201. [PMID: 17651674 DOI: 10.2310/6650.2007.06046] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [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: 11/18/2022]
Abstract
Myocardial damage is a frequent complication of cardiac surgery by direct mechanical trauma during the surgical procedure and by myocardial ischemia, which occurs during the cardiopulmonary bypass (CBP). Because the concentrations of biomarkers in the blood collected from the coronary sinus are the best witness of the myocardial damages, we measured the levels of specific cardiac troponin I (c-TnI) and nonspecific (adenosine, myoglobin) markers of left ventricular damages in the coronary sinus of patients during cardiac surgery. Thirty patients who underwent aortic valve replacement for aortic stenosis were included. Blood samples were collected in the coronary sinus and in the radial artery at the beginning (T0), at the end of the CBP (T1), and then 24 hours later (T2). At T0 and T1, adenosine, c-TnI, and myoglobin levels were significantly higher in the coronary sinus than in the radial artery (T0: adenosine: mean +27%; c-TnI: +41%; myoglobin: +28%; T1: adenosine: mean +58%; c-TnI: +58%; myoglobin: +25%; p < .001). These parameters were significantly higher in the coronary sinus at T1 compared with T0 (adenosine: +50%; c-TnI: +229%; myoglobin: +94%; p < .01) and in the radial artery (adenosine: +21%; c-TnI: +194%; myoglobin: +98%; p < .01). At T2, c-TnI further increased. Damages to the myocardium during cardiac surgery are minimal in our surgical conditions but are probably underestimated when using markers measured at the peripheral level. However, most of the damages appear several hours after the surgery.
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Affiliation(s)
- François Kerbaul
- Departement d'Anesthésie Réanimation, CHU Timone, Marseille, France
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