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Poisson J, El-Sissy C, Serret-Larmande A, Smith N, Lebraud M, Augy JL, Conti C, Gonnin C, Planquette B, Arlet JB, Hermann B, Charbit B, Pastre J, Devaux F, Ladavière C, Lim L, Ober P, Cannovas J, Biard L, Gulczynski MC, Blumenthal N, Péré H, Knosp C, Gey A, Benhamouda N, Murris J, Veyer D, Tartour E, Diehl JL, Duffy D, Paillaud E, Granier C. Increased levels of GM-CSF and CXCL10 and low CD8 + memory stem T Cell count are markers of immunosenescence and severe COVID-19 in older people. Immun Ageing 2024; 21:28. [PMID: 38715114 PMCID: PMC11075216 DOI: 10.1186/s12979-024-00430-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 04/18/2024] [Indexed: 05/12/2024]
Abstract
BACKGROUND Ageing leads to altered immune responses, resulting in higher susceptibility to certain infections in the elderly. Immune ageing is a heterogeneous process also associated with inflammaging, a low-grade chronic inflammation. Altered cytotoxic T cell responses and cytokine storm have previously been described in severe COVID-19 cases, however the parameters responsible for such immune response failures are not well known. The aim of our study was to characterize CD8+ T cells and cytokines associated with ageing, in a cohort of patients aged over 70 years stratified by COVID-19 severity. RESULTS One hundred and four patients were included in the study. We found that, in older people, COVID-19 severity was associated with (i) higher level of GM-CSF, CXCL10 (IP-10), VEGF, IL-1β, CCL2 (MCP-1) and the neutrophil to lymphocyte ratio (NLR), (ii) increased terminally differentiated CD8+T cells, and (ii) decreased early precursors CD8+ T stem cell-like memory cells (TSCM) and CD27+CD28+. The cytokines mentioned above were found at higher concentrations in the COVID-19+ older cohort compared to a younger cohort in which they were not associated with disease severity. CONCLUSIONS Our results highlight the particular importance of the myeloid lineage in COVID-19 severity among older people. As GM-CSF and CXCL10 were not associated with COVID-19 severity in younger patients, they may represent disease severity specific markers of ageing and should be considered in older people care.
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Affiliation(s)
- Johanne Poisson
- Université Paris Cité, Paris, France
- Department of Geriatric Medicine, Hôpital Europeen Georges Pompidou, AP-HP, Paris, France
- Inserm U1149, Center for Research on Inflammation, Paris, France
| | - Carine El-Sissy
- INSERM, Laboratory of Integrative Cancer Immunology, Paris, France
- Cordeliers Research Center, Sorbonne University, University Paris Cité, Paris, France
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France
| | - Arnaud Serret-Larmande
- ECSTRRA Team, UMR-1153, Université Paris Cité, INSERM, AP-HP, Saint Louis Hospital, Paris, France
| | - Nikaïa Smith
- Translational Immunology Unit, Institut Pasteur, Université Paris Cité, Paris, France
| | - Morgane Lebraud
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France
| | - Jean-Loup Augy
- Medical intensive care unit, Hopital Delafontaine, 2 rue du Dr Delafontaine, Saint-Denis, 93200, France
| | - Catherine Conti
- Université Paris Cité, Paris, France
- Department of Geriatric Medicine, Hôpital Europeen Georges Pompidou, AP-HP, Paris, France
| | - Cécile Gonnin
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France
- Université Paris Cité, INSERM, PARCC, Paris, France
| | - Benjamin Planquette
- Service de Pneumologie Et Soins Intensifs, Hôpital Européen Georges Pompidou, AP-HP, Paris, France
| | - Jean-Benoît Arlet
- Internal Medicine Department, Georges Pompidou European Hospital, Assistance Publique-Hôpitaux de Paris (AP-HP), Paris, France
- Faculty of Medicine, Université Paris Cité, Paris, 75006, France
| | - Bertrand Hermann
- Medical Intensive Care Unit, AP-HP. Centre Université Paris Cité, Georges Pompidou European Hospital, Paris, 75015, France
- INSERM UMR 1266, Institut de Psychiatrie Et Neurosciences de Paris (IPNP), Université Paris Cité, Paris, France
| | - Bruno Charbit
- Institute of Ophthalmology, University College London (UCL), London, UK
| | - Jean Pastre
- Service de Pneumologie Et Soins Intensifs, Hôpital Européen Georges Pompidou, AP-HP, Paris, France
| | - Floriane Devaux
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France
| | - Cyrielle Ladavière
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France
| | - Lydie Lim
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France
| | - Pauline Ober
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France
| | - Johanna Cannovas
- Department of Geriatric Medicine, Hôpital Europeen Georges Pompidou, AP-HP, Paris, France
| | - Lucie Biard
- ECSTRRA Team, UMR-1153, Université Paris Cité, INSERM, AP-HP, Saint Louis Hospital, Paris, France
| | - Marie-Christelle Gulczynski
- Gérontologie 1, GHU AP-HP. Centre Université Paris Cité, Corentin Celton Hospital, Issy-Les-Moulineaux, 92130, France
| | - Noémie Blumenthal
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France
| | - Hélène Péré
- Virology Laboratory, Hôpital Européen Georges-Pompidou, APHP.Centre - Université Paris Cité, Paris, France
- Centre de Recherche Des Cordeliers, Sorbonne Université, Inserm, Université de Paris, Functional Genomics of Solid Tumors Laboratory, Équipe Labellisée Ligue Nationale Contre Le Cancer, Labex OncoImmunology, Paris, France
- Université Paris Cité, Faculté de Santé, UFR de Médecine, Paris, France
| | | | - Alain Gey
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France
| | - Nadine Benhamouda
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France
| | - Juliette Murris
- HeKA, Inria Paris, Inserm, Université Paris Cité, Paris, France
| | - David Veyer
- Virology Laboratory, Hôpital Européen Georges-Pompidou, APHP.Centre - Université Paris Cité, Paris, France
- Centre de Recherche Des Cordeliers, Sorbonne Université, Inserm, Université de Paris, Functional Genomics of Solid Tumors Laboratory, Équipe Labellisée Ligue Nationale Contre Le Cancer, Labex OncoImmunology, Paris, France
| | - Eric Tartour
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France
| | - Jean-Luc Diehl
- Medical Intensive Care Unit, AP-HP. Centre Université Paris Cité, Georges Pompidou European Hospital, Paris, 75015, France
- University Paris Cité, Innovative Therapies in Hemostasis, INSERM, Paris, 75006, France
| | - Darragh Duffy
- Translational Immunology Unit, Institut Pasteur, Université Paris Cité, Paris, France
| | - Elena Paillaud
- Université Paris Cité, Paris, France.
- Department of Geriatric Medicine, Hôpital Europeen Georges Pompidou, AP-HP, Paris, France.
- Univ. Paris Est Créteil, Inserm U955, IMRB, Créteil, France.
| | - Clémence Granier
- Department of Immunology, APHP, Hôpital Européen Georges Pompidou (HEGP), Paris, France.
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Launois A, Chahabi SZ, Devaux F, Amouroux I, Flaujac C. Commercial human frozen plasmas for local, cross-site and long-term comparability of coagulation analysers. Blood Coagul Fibrinolysis 2024; 35:14-22. [PMID: 38051662 DOI: 10.1097/mbc.0000000000001268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Laboratory compliance implies to correlate instruments for coagulation parameter with a wide range of measure using patient samples or commercialized sets of frozen plasmas. The aim of this study was to evaluate the intra, inter-reproducibility and long-term stability of ExpertCor Routine (ECR) plasma sets (Stago) on different parameters. The study was realized in two laboratories on four different instruments. Inter-site and intra-site correlation of ECR sets for PT, aPTT, Fibrinogen, INR, factor V (FV) UFH and LMWH anti-Xa and intra-reproducibility of DDimer (DDI), factor VIII (FVIII:C) and antithrombin (AT) assays were tested. To evaluate ECR long-term stability, samples were tested until 180 after delivery in one laboratory. Intra-site evaluation correlation coefficients is around 1. All predefined criteria to fulfil good comparability between inter-site instruments are met with Passing slopes between 0.9 and 1.1 and intercepts ranging from -0.62 to 2.83%. Long-term stability evaluation does not show any deviation over 180 days for aPTT, fibrinogen, DDI, UFH, LMWH but a drift for FV with STA-NeoPTimal reagent. On contrary, AT and FVIII:C are not stable. PT in second has an excellent stability unlike PT in percentage. Our study validates the use of ECR sets for correlation between instruments and inter-sites agreement, as for parameters claimed on the products than for factor V and FVIII:C. The evaluation of stability confirming the possible extension of use for 180 days after delivery except for FVIII:C and AT. These plasmas sets are an excellent alternative to local plasma patient use to perform instrument comparison.
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Affiliation(s)
- Amélie Launois
- Laboratoire de Biologie Médicale (secteur hémostase), Hôpital André Mignot - Versailles, Le Chesnay
| | - Sara Zia Chahabi
- Laboratoire de Biologie Médicale (secteur hémostase), Hôpital André Mignot - Versailles, Le Chesnay
| | - Floriane Devaux
- Laboratoire de Biologie Médicale (secteur hémostase), Hôpital André Mignot - Versailles, Le Chesnay
| | - Isabelle Amouroux
- Laboratoire de Biologie Médicale, Centre hospitalier de Rambouillet, France
| | - Claire Flaujac
- Laboratoire de Biologie Médicale (secteur hémostase), Hôpital André Mignot - Versailles, Le Chesnay
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De Toni T, Stock AA, Devaux F, Gonzalez GC, Nunez K, Rubanich JC, Safley SA, Weber CJ, Ziebarth NM, Buchwald P, Tomei AA. Parallel Evaluation of Polyethylene Glycol Conformal Coating and Alginate Microencapsulation as Immunoisolation Strategies for Pancreatic Islet Transplantation. Front Bioeng Biotechnol 2022; 10:886483. [PMID: 35651551 PMCID: PMC9149081 DOI: 10.3389/fbioe.2022.886483] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 04/12/2022] [Indexed: 01/21/2023] Open
Abstract
Pancreatic islet transplantation improves metabolic control and prevents complications in patients with brittle type 1 diabetes (T1D). However, chronic immunosuppression is required to prevent allograft rejection and recurrence of autoimmunity. Islet encapsulation may eliminate the need for immunosuppression. Here, we analyzed in parallel two microencapsulation platforms that provided long-term diabetes reversal in preclinical T1D models, alginate single and double capsules versus polyethylene glycol conformal coating, to identify benefits and weaknesses that could inform the design of future clinical trials with microencapsulated islets. We performed in vitro and in vivo functionality assays with human islets and analyzed the explanted grafts by immunofluorescence. We quantified the size of islets and capsules, measured capsule permeability, and used these data for in silico simulations of islet functionality in COMSOL Multiphysics. We demonstrated that insulin response to glucose stimulation is dependent on capsule size, and the presence of permselective materials augments delays in insulin secretion. Non-coated and conformally coated islets could be transplanted into the fat pad of diabetic mice, resulting in comparable functionality and metabolic control. Mac-2+ cells were found in conformally coated grafts, indicating possible host reactivity. Due to their larger volume, alginate capsules were transplanted in the peritoneal cavity. Despite achieving diabetes reversal, changes in islet composition were found in retrieved capsules, and recipient mice experienced hypoglycemia indicative of hyperinsulinemia induced by glucose retention in large capsules as the in silico model predicted. We concluded that minimal capsule size is critical for physiological insulin secretion, and anti-inflammatory modulation may be beneficial for small conformal capsules.
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Affiliation(s)
- Teresa De Toni
- Diabetes Research Institute, University of Miami Miller School of Medicine, Miami, FL, United States
- Department of Biomedical Engineering, University of Miami, Miami, FL, United States
| | - Aaron A. Stock
- Diabetes Research Institute, University of Miami Miller School of Medicine, Miami, FL, United States
- Department of Biomedical Engineering, University of Miami, Miami, FL, United States
| | - Floriane Devaux
- Department of Biomedical Engineering, University of Miami, Miami, FL, United States
| | - Grisell C. Gonzalez
- Diabetes Research Institute, University of Miami Miller School of Medicine, Miami, FL, United States
| | - Kailyn Nunez
- Department of Biomedical Engineering, University of Miami, Miami, FL, United States
| | - Jessica C. Rubanich
- Department of Biomedical Engineering, University of Miami, Miami, FL, United States
| | - Susan A. Safley
- Department of Surgery, Emory University, Atlanta, GA, United States
| | - Collin J. Weber
- Department of Surgery, Emory University, Atlanta, GA, United States
| | - Noel M. Ziebarth
- Department of Biomedical Engineering, University of Miami, Miami, FL, United States
| | - Peter Buchwald
- Diabetes Research Institute, University of Miami Miller School of Medicine, Miami, FL, United States
- Department of Molecular and Cellular Pharmacology, University of Miami, Miller School of Medicine, Miami, FL, United States
| | - Alice A. Tomei
- Diabetes Research Institute, University of Miami Miller School of Medicine, Miami, FL, United States
- Department of Biomedical Engineering, University of Miami, Miami, FL, United States
- Department of Surgery, University of Miami Miller School of Medicine, Miami, FL, United States
- Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, FL, United States
- *Correspondence: Alice A. Tomei,
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Sun M, Zafrullah N, Adams S, Devaux F, Avila MY, Ziebarth N, Margo CE, Koch M, Espana EM. Collagen XIV Is an Intrinsic Regulator of Corneal Stromal Structure and Function. Am J Pathol 2021; 191:2184-2194. [PMID: 34560063 DOI: 10.1016/j.ajpath.2021.08.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 08/04/2021] [Accepted: 08/16/2021] [Indexed: 12/01/2022]
Abstract
Collagen XIV is poorly characterized in the body, and the current knowledge of its function in the cornea is limited. The aim of the current study was to elucidate the role(s) of collagen XIV in regulating corneal stromal structure and function. Analysis of collagen XIV expression, temporal and spatial, was performed at different postnatal days (Ps) in wild-type C57BL/6 mouse corneal stromas and after injury. Conventional collagen XIV null mice were used to inquire the roles that collagen XIV plays in fibrillogenesis, fibril packing, and tissue mechanics. Fibril assembly and packing as well as stromal organization were evaluated using transmission electron microscopy and second harmonic generation microscopy. Atomic force microscopy was used to assess stromal stiffness. Col14a1 mRNA expression was present at P4 to P10 and decreased at P30. No immunoreactivity was noted at P150. Abnormal collagen fibril assembly with a shift toward larger-diameter fibrils and increased interfibrillar spacing in the absence of collagen XIV was found. Second harmonic generation microscopy showed impaired fibrillogenesis in the collagen XIV null stroma. Mechanical testing suggested that collagen XIV confers stiffness to stromal tissue. Expression of collagen XIV is up-regulated following injury. This study indicates that collagen XIV plays a regulatory role in corneal development and in the function of the adult cornea. The expression of collagen XIV is recapitulated during wound healing.
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Affiliation(s)
- Mei Sun
- Cornea and External Disease, Department of Ophthalmology, University of South Florida, Morsani College of Medicine, Tampa, Florida
| | - Nabeel Zafrullah
- Cornea and External Disease, Department of Ophthalmology, University of South Florida, Morsani College of Medicine, Tampa, Florida
| | - Sheila Adams
- Cornea and External Disease, Department of Ophthalmology, University of South Florida, Morsani College of Medicine, Tampa, Florida
| | - Floriane Devaux
- Biomedical Atomic Force Microscopy Laboratory, Department of Biomedical Engineering, College of Engineering, University of Miami, Miami, Florida
| | - Marcel Y Avila
- Department of Ophthalmology, Universidad Nacional de Colombia, Bogota, Colombia
| | - Noel Ziebarth
- Biomedical Atomic Force Microscopy Laboratory, Department of Biomedical Engineering, College of Engineering, University of Miami, Miami, Florida; Department of Physiology and Biophysics, Miller School of Medicine, University of Miami, Miami, Florida
| | - Curtis E Margo
- Cornea and External Disease, Department of Ophthalmology, University of South Florida, Morsani College of Medicine, Tampa, Florida
| | - Manuel Koch
- Institute for Dental Research and Oral Musculoskeletal Biology, Center for Biochemistry, University of Cologne, Cologne, Germany
| | - Edgar M Espana
- Cornea and External Disease, Department of Ophthalmology, University of South Florida, Morsani College of Medicine, Tampa, Florida; Department of Molecular Pharmacology and Physiology, University of South Florida, Morsani College of Medicine, Tampa, Florida.
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5
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Devaux F, Li X, Sluysmans D, Maurizot V, Bakalis E, Zerbetto F, Huc I, Duwez AS. Single-molecule mechanics of synthetic aromatic amide helices: Ultrafast and robust non-dissipative winding. Chem 2021. [DOI: 10.1016/j.chempr.2021.02.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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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Sun M, Zafrullah N, Devaux F, Hemmavanh C, Adams S, Ziebarth NM, Koch M, Birk DE, Espana EM. Collagen XII Is a Regulator of Corneal Stroma Structure and Function. Invest Ophthalmol Vis Sci 2020; 61:61. [PMID: 32462201 PMCID: PMC7405808 DOI: 10.1167/iovs.61.5.61] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 01/24/2023] Open
Abstract
Purpose The aim of this study was to determine the roles of collagen XII in the regulation of stromal hierarchical organization, keratocyte organization, and corneal mechanics. Methods The temporal and spatial expression of collagen XII at postnatal days 4, 10, 30, 90, and 150 were evaluated in wild-type (WT) mice. The role of collagen XII in hierarchical organization was analyzed by measuring fibril diameter and density, as well as stromal lamellar structure, within ultrastructural micrographs obtained from WT and collagen XII-deficient mice (Col12a1–/–). Keratocyte morphology and networks were assessed using actin staining with phalloidin and in vivo confocal microscopy. The effects of collagen XII on corneal biomechanics were evaluated with atomic force microscopy. Results Collagen XII was localized homogeneously in the stroma from postnatal day 4 to day 150, and protein accumulation was shown to increase during this period using semiquantitative immunoblots. Higher fibril density (P < 0.001) and disruption of lamellar organization were found in the collagen XII null mice stroma when compared to WT mice. Keratocyte networks and organization were altered in the absence of collagen XII, as demonstrated using fluorescent microscopy after phalloidin staining and in vivo confocal microscopy. Corneal stiffness was increased in the absence of collagen XII. Young's modulus was 16.2 ± 5.6 kPa in WT and 32.8 ± 6.4 kPa in Col12a1–/– corneas. The difference between these two groups was significant (P < 0.001, t-test). Conclusions Collagen XII plays a major role in establishing and maintaining stromal structure and function. In the absence of collagen XII, the corneal stroma showed significant abnormalities, including decreased interfibrillar space, disrupted lamellar organization, abnormal keratocyte organization, and increased corneal stiffness.
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Osman J, Lambert J, Templé M, Devaux F, Favre R, Flaujac C, Bridoux D, Marque-Juillet S, Bruneel F, Mignon F, Diaz-Flores E, Hentgen V, Greder-Belan A, Azarian R, Koukabi M, Rousselot P, Raggueneau V, Manéglier B. Rapid screening of COVID-19 patients using white blood cell scattergrams, a study on 381 patients. Br J Haematol 2020; 190:718-722. [PMID: 32542672 PMCID: PMC7323204 DOI: 10.1111/bjh.16943] [Citation(s) in RCA: 15] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 06/13/2020] [Indexed: 12/28/2022]
Abstract
Complementary tools are warranted to increase the sensitivity of the initial testing for COVID-19. We identified a specific 'sandglass' aspect on the white blood cell scattergram of COVID-19 patients reflecting the presence of circulating plasmacytoid lymphocytes. Patients were dichotomized as COVID-19-positive or -negative based on reverse transcriptase polymerase chain reaction (RT-PCR) and chest computed tomography (CT) scan results. Sensitivity and specificity of the 'sandglass' aspect were 85·9% and 83·5% respectively. The positive predictive value was 94·3%. Our findings provide a non-invasive and simple tool to quickly categorize symptomatic patients as either COVID-19-probable or -improbable especially when RT-PCR and/or chest CT are not rapidly available.
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Affiliation(s)
- Jennifer Osman
- Department of Hematobiology, CH Versailles, Le Chesnay, France
| | - Jérome Lambert
- Institute of Medical Biometry and Statistics, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany.,INSERM UMR1153 ECSTRRA Team, Paris, France
| | - Marie Templé
- Department of Hematobiology, CH Versailles, Le Chesnay, France
| | - Floriane Devaux
- Department of Hematobiology, CH Versailles, Le Chesnay, France
| | - Rémy Favre
- Department of Hematobiology, CH Versailles, Le Chesnay, France
| | - Claire Flaujac
- Department of Hematobiology, CH Versailles, Le Chesnay, France
| | | | | | - Fabrice Bruneel
- Department of Critical Care, CH de Versailles, Le Chesnay, France
| | - François Mignon
- Department of Radiology, CH de Versailles, Le Chesnay, France
| | - Ernesto Diaz-Flores
- Department of Pediatrics, Benioff Children's Hospital, Helen Diller Comprehensive cancer center, UCSF, San Francisco, CA, USA
| | | | - Alix Greder-Belan
- Department of Internal Medecine and Infectious Diseases, CH de Versailles, Le Chesnay, France
| | - Reza Azarian
- Department of Pneumology, CH de Versailles, Le Chesnay, France
| | - Mehrsa Koukabi
- Emergency department, CH de Versailles, Le Chesnay, France
| | - Philippe Rousselot
- Department of Hematology and Oncology, CH de Versailles, Le Chesnay, France.,UMR1184, University of Versailles Saint-Quentin-en-Yvelines and Paris Saclay, Versailles, France
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Travascio F, Devaux F, Volz M, Jackson AR. Molecular and macromolecular diffusion in human meniscus: relationships with tissue structure and composition. Osteoarthritis Cartilage 2020; 28:375-382. [PMID: 31917232 PMCID: PMC7248550 DOI: 10.1016/j.joca.2019.12.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/14/2019] [Accepted: 12/22/2019] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To date, the pathophysiology of the meniscus has not been fully elucidated. Due to the tissue's limited vascularization, nutrients and other molecular signals spread through the extracellular matrix via diffusion or convection (interstitial fluid flow). Understanding transport mechanisms is crucial to elucidating meniscal pathophysiology, and to designing treatments for repair and restoration of the tissue. Similar to other fibrocartilaginous structures, meniscal morphology and composition may affect its diffusive properties. The objective of this study was to investigate the role of solute size, and tissue structure and composition on molecular diffusion in meniscus tissue. DESIGN Using a custom FRAP technique developed in our lab, we measured the direction-dependent diffusivity in human meniscus of six different molecular probes of size ranging from ∼300Da to 150,000Da. Diffusivity measurements were related to sample water content. SEM images were used to investigate collagen structure in relation to transport mechanisms. RESULTS Diffusivity was anisotropic, being significantly faster in the direction parallel to collagen fibers when compared the orthogonal direction. This was likely due to the unique structural organization of the tissue presenting pores aligned with the fibers, as observed in SEM images. Diffusion coefficients decreased as the molecular size increased, following the Ogston model. No significant correlations were found among diffusion coefficients and water content of the tissue. CONCLUSIONS This study provides new knowledge on the mechanisms of molecular transport in meniscal tissue. The reported results can be leveraged to further investigate tissue pathophysiology and to design treatments for tissue restoration or replacement.
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Affiliation(s)
- F Travascio
- Department of Industrial Engineering, University of Miami, Coral Gables, FL, USA; Max Biedermann Institute for Biomechanics at Mount Sinai Medical Center, Miami Beach, FL, USA.
| | - F Devaux
- Department of Biomedical Engineering, University of Miami, Coral Gables, FL, USA
| | - M Volz
- Department of Biomedical Engineering, University of Miami, Coral Gables, FL, USA
| | - A R Jackson
- Department of Biomedical Engineering, University of Miami, Coral Gables, FL, USA.
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Sueiras VM, Devaux F, Smith B, Lai J, Batchelor W, Likht NY, Moy VT, Ziebarth NM. Age-dependency of molecular diffusion in the human anterior lens capsule assessed using fluorescence recovery after photobleaching. Mol Vis 2019; 25:593-xxx. [PMID: 31741652 PMCID: PMC6828993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 10/12/2019] [Indexed: 11/03/2022] Open
Abstract
Purpose To quantify the partition coefficient and the diffusion coefficient of metal-carrier proteins in the human lens capsule as a function of age. Methods Whole lenses from human donors were incubated overnight in a solution of fluorescently labeled transferrin, albumin, or ceruloplasmin. In the central plane of the capsule thickness, fluorescence recovery after photobleaching (FRAP) experiments were conducted to measure the diffusion of the protein within the lens capsule. The anterior portion of the lens was recorded before the FRAP experiments to locate the boundaries of the anterior lens capsule and to measure the partition coefficient of the labeled proteins. The partition coefficient (P), the time to half maximum recovery of the fluorescent intensity (τ1/2), and the diffusion coefficient (D) for each protein were analyzed as a function of donor age. Results There was no statistically significant relationship between the half maximum recovery time or the diffusion coefficient and age for transferrin (molecular weight [MW]=79.5 kDa, τ1/2=17.26±4.840 s, D=0.17±0.05 μm2/s), serum albumin (MW=66.5 kDa, τ1/2=18.45±6.110 s, D=0.17±0.06 μm2/s), or ceruloplasmin (MW=120 kDa, τ1/2=36.57±5.660 s, D=0.08±0.01 μm2/s). As expected, the larger protein (ceruloplasmin) took longer to recover fluorescent intensity due to its slower movement within the lens capsule. The partition coefficient statistically significantly increased with age for each protein (Palbumin: 0.09-0.71, Pceruloplasmin: 0.42-0.95, Ptransferrin: 0.19-1.17). Conclusions The diffusion of heavy-metal protein carriers within the anterior lens capsule is not dependent on age, but it is dependent on the size of the protein. The permeability of the lens capsule to these heavy-metal protein carriers increases with age, suggesting that there will be a higher concentration of heavy metals in the older lens. This behavior may favor the formation of cataract, because heavy metals enhance protein oxidation through the Fenton reaction.
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Affiliation(s)
- Vivian M. Sueiras
- Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, FL
| | - Floriane Devaux
- Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, FL
| | - Benjamin Smith
- Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, FL
| | - James Lai
- Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, FL
| | - Wyndham Batchelor
- Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, FL
| | - Nikita Y. Likht
- Florida Lions Eye Bank, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL
| | - Vincent T. Moy
- Department of Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, FL
| | - Noël M. Ziebarth
- Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, FL,Department of Physiology and Biophysics, University of Miami Miller School of Medicine, Miami, FL
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10
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Devaux F, Fillet M, Krzesinski F. [Torsade de pointe resulting from a drug interaction between sotalol and ciprofloxacin]. Rev Med Liege 2019; 74:382-387. [PMID: 31373450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Sotalol is a bêta-blocker and class 3 anti-arrhythmic. Ciprofloxacin is a fluoroquinolone antibiotic used against Gram - germs. Both drugs have a common adverse effect : they increase QT interval with a risk of torsade de pointe. The risk increases even more if other risk factors are present such as old age, female gender, renal failure, high blood pressure and ionic disturbances. Because a long QT interval is not associated with symptoms, only an electrocardiogram can establish the diagnosis. However, it's not rare that a torsade de pointe will reveal it. We report a clinical case of a long QT interval due to the association of sotalol and ciprofloxacin, which led to a torsade de pointe. Intravenous magnesium sulphate is the recommended treatment if haemodynamic parameters are good. If not, an external electric shock may be needed.
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Affiliation(s)
- F Devaux
- Faculté de Médecine, ULiège, Belgique
| | - M Fillet
- Service d'Urologie, CHU Liège, Belgique
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11
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Abstract
The variety of environmental stresses is probably the major challenge imposed on transcription activators and the transcriptional machinery. To precisely describe the very early genomic response developed by yeast to accommodate a chemical stress, we performed time course analyses of the modifications of the yeast gene expression program which immediately follows the addition of the antimitotic drug benomyl. Similar analyses were conducted with different isogenic yeast strains in which genes coding for relevant transcription factors were deleted and coupled with efficient bioinformatics tools. Yap1 and Pdr1, two well-known key mediators of stress tolerance, appeared to be responsible for the very rapid establishment of a transient transcriptional response encompassing 119 genes. Yap1, which plays a predominant role in this response, binds, in vivo, promoters of genes which are not automatically up-regulated. We proposed that Yap1 nuclear localization and DNA binding are necessary but not sufficient to elicit the specificity of the chemical stress response.
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Affiliation(s)
- A Lucau-Danila
- Laboratoire de Génétique Moléculaire, CNRS UMR 8541, Ecole Normale Supérieure, 46 rue d'Ulm, 75230 Paris cedex 05, France
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12
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Devaux F, Mosset A, Lantz E, Monneret S, Le Gall H. Image Upconversion from the Visible to the UV Domain: Application to Dynamic UV Microstereolithography. Appl Opt 2001; 40:4953-4957. [PMID: 18364772 DOI: 10.1364/ao.40.004953] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We present what to our knowledge is a new application of optical frequency upconversion of images in quadratic materials to dynamic UV microstereolithography. A 150 x 150 point visible image transmitted by a liquid-crystal display was upconverted in a lithium triborate crystal, and the UV image was successfully used to polymerize a commercial stereolithographic resin.
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13
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Abstract
The yeast Microarray Global Viewer (yMGV) is an on-line database providing a synthetic view of the transcriptional expression profiles of Saccharomyces cerevisiae genes in most of the published expression datasets. yMGV displays a one-screen graphical representation of gene expression variations for each published genome-wide experiment, allowing quick retrieval of experimental conditions affecting expression of this gene. yMGV also provides tools to isolate groups of genes sharing similar transcription profiles in a defined subset of experiments. Additionally, yMGV furnishes a set of statistical tools for critical assessment of published data. We therefore believe that yMGV is an efficient tool that affords a quick and comprehensive overview of microarray data and generates new gene classifications. As of 20 March 2001 the yMGV database contains 6 000 000 measurements, representing genome-wide expression comparisons of 932 experiments from 39 microarray publications. The yMGV interface is available at http://transcriptome.ens.fr/ymgv/.
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Affiliation(s)
- P Marc
- Laboratoire de Génétique Moléculaire, CNRS 8541, Ecole Normale Supérieure, 46 Rue d'Ulm, 75005 Paris, France.
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14
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Abstract
Gene-specific transcription activators are among the main factors which specifically shape the transcriptome profiles. It is tempting to take advantage of their properties to decipher the genome expression circuitry. The advent of microarray technology has offered fantastic opportunities to quickly analyze the expression profiles dictated by specific transcription factors. This review will first focus on the strategies which have been devised to control the activity of transcription factors and in the second part on the microarray experiments which addressed the role of these transcription factors in the genome-wide expression profile. This last part will mainly consider the case of the yeast Saccharomyces cerevisiae genome. All the collected data are available through the on-line database yTAFNET (http://transcriptome.ens.fr/ytafnet/). yTAFNET is designed to help the characterization of connections between the different yeast regulatory networks.
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Affiliation(s)
- F Devaux
- Laboratoire de genetique moleculaire, Ecole Normale Superieure, 46 rue d'Ulm, 75005, Paris, France
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15
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Devaux F, Marc P, Bouchoux C, Delaveau T, Hikkel I, Potier MC, Jacq C. An artificial transcription activator mimics the genome-wide properties of the yeast Pdr1 transcription factor. EMBO Rep 2001; 2:493-8. [PMID: 11415981 PMCID: PMC1083908 DOI: 10.1093/embo-reports/kve114] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [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: 02/07/2023] Open
Abstract
We analysed the genome-wide regulatory properties of an artificial transcription activator in which the DNA-binding domain of the yeast transcription factor, Pdr1, was fused to the activation domain of Gal4 (Pdr1*GAD). This Pdr1*GAD chimera was put under the control of the inducible GAL1 promoter. DNA microarray analyses showed that all the target genes upregulated by the well-studied native gain-of-function Pdr1-3 mutant were similarly activated by the chimerical factor Pdr1*GAD upon galactose induction. Additionally, this kinetic approach led us not only to confirm previously published targets, but also to define a hierarchy among members of the Pdr1 regulon. Our observations prove, for the first time at the complete genome level, that the DNA-binding domain of Pdr1 is sufficient to guide its specificity. We propose that this approach could be useful for the study of new transcription factors identified in silico from sequenced organisms. Complete data are available at www.biologie.ens.fr/yeast-publi.html.
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Affiliation(s)
- F Devaux
- Laboratoire de Génétique Moléculaire, CNRS UMR 8541, Ecole Normale Supérieure, 46 rue d'Ulm, Paris, France
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16
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Devaux F, Lantz E. Gain in phase sensitive parametric image amplification. Phys Rev Lett 2000; 85:2308-2311. [PMID: 10977998 DOI: 10.1103/physrevlett.85.2308] [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] [Subscribe] [Scholar Register] [Received: 12/17/1999] [Indexed: 05/23/2023]
Abstract
We report an experiment of type 2 parametric image amplification in a phase sensitive configuration. In the spatial frequency domain, the parametric gain corresponds to amplification or deamplification, depending on the relative phase of the input image with respect to the pump wave and on the spatial frequencies of the input image.
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Affiliation(s)
- F Devaux
- Laboratoire d'Optique P.M. Duffieux, Centre National de la Recherche Scientifique, Unite Mixte de Recherche 6603, Universite de Franche-Comte, F-25030 Besancon cedex, France
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17
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Le Tolguenec G, Devaux F, Lantz E. Two-dimensional time-resolved direct imaging through thick biological tissues: a new step toward noninvasive medical imaging. Opt Lett 1999; 24:1047-9. [PMID: 18073936 DOI: 10.1364/ol.24.001047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We report an original two-dimensional time-resolved direct imaging method for transillumination optical tomography that combines the time-gating and forward phase-conjugation properties of type II degenerate parametric amplification. An object with subcentimeter resolution embedded in 4-cm-thick chicken breast tissue was imaged with a signal-to-noise ratio of 2.
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Devaux F, Guiot E, Lantz E. Image restoration through aberrant media by optical phase conjugation in a type II three-wave mixing interaction. Opt Lett 1998; 23:1597-1599. [PMID: 18091856 DOI: 10.1364/ol.23.001597] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Restoration of an image through an aberrant plate has been achieved by use of optical phase conjugation in a type II parametric interaction in which the amplified signal and idler waves are reflected back through the aberrant medium. The resolution of the restored phase-conjugate images is equal to 0.18 mm, and the amplification gain is ~4dB.
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20
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Le Tolguenec G, Lantz E, Devaux F. Imaging through scattering media by parametric amplification of images: study of the resolution and the signal-to-noise ratio. Appl Opt 1997; 36:8292-8297. [PMID: 18264370 DOI: 10.1364/ao.36.008292] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
An imaging scheme through scattering media in which parametric image amplification is used is presented. An image of a resolution chart through a solution of latex microspheres with an attenuation of 22 mean free paths is obtained with a resolution of 20 mum. The evolution of the signal-to-noise ratio with respect to the medium attenuation is studied and compared with a rough modeling of the imaging process.
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21
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Devaux F, Roussel V. [Management and quality assurance in the hospital]. Rev Infirm 1995:7-10. [PMID: 7676190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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22
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Roussel V, Devaux F, Deffarges D, Girot S. [Closed bladder catherization in the adult: choice of materials]. Rev Infirm 1994:54-9. [PMID: 7652361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Bouissou P, Galen FX, Richalet JP, Lartigue M, Devaux F, Dubray C, Atlan G. Effects of propranolol and pindolol on plasma ANP levels in humans at rest and during exercise. Am J Physiol 1989; 257:R259-64. [PMID: 2527473 DOI: 10.1152/ajpregu.1989.257.2.r259] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In attempt to elucidate whether the beta-adrenoceptor is involved in the control of atrial natriuretic peptide (ANP) secretion, plasma immunoreactive ANP level was measured at rest, in recumbent and upright positions, and during graded maximal ergocycle exercise in nine healthy male subjects (23 +/- 0.5 years of age) treated for 3 days with nonselective beta-blockers propranolol (150 mg/day) or pindolol (15 mg/day) or with placebo. The effects of beta-blockers, which differ by their hemodynamic actions at rest because of the intrinsic sympathomimetic activity of pindolol, were compared. Maximal O2 consumption (VO2max) during beta-blockade was not significantly different from the placebo value. Resting heart rate was not affected by pindolol treatment but was decreased with propranolol (-10 beats/min). Both beta-blockers caused a reduction in heart rate at all the exercise intensities. Mean blood pressure was not affected by beta-blockade at rest but was significantly reduced during exercise. During placebo treatment, plasma ANP increased in response to exercise intensities greater than 65% of VO2max. At 100% VO2max plasma ANP was nearly doubled (101.5 +/- 14 pg/ml) compared with the basal value in upright position (56.6 +/- 15 pg/ml). beta-Blockade caused a marked elevation in plasma ANP at all the levels of activity. Despite different hemodynamic responses to pindolol and propranolol, both beta-blockers produced similar increases in the basal level of plasma ANP. These rises were maintained in the course of exercise tests, and no significant difference was found between propranolol and pindolol. We conclude that beta-adrenoceptor mechanisms are not directly responsible for tonic and exercise-induced ANP secretion in humans.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- P Bouissou
- Département de Physiologie, Faculté de Médecine de Créteil, Institut National de la Santé, France
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26
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Bouissou P, Richalet JP, Galen FX, Lartigue M, Larmignat P, Devaux F, Dubray C, Keromes A. Effect of beta-adrenoceptor blockade on renin-aldosterone and alpha-ANF during exercise at altitude. J Appl Physiol (1985) 1989; 67:141-6. [PMID: 2527226 DOI: 10.1152/jappl.1989.67.1.141] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The renin-aldosterone system may be depressed in subjects exercising at high altitude, thereby preventing excessive angiotensin I (ANG I) and aldosterone levels, which could favor the onset of acute mountain sickness. The role of beta-adrenoceptors in hormonal responses to hypoxia was investigated in 12 subjects treated with a nonselective beta-blocker, pindolol. The subjects performed a standardized maximal bicycle ergometer exercise with (P) and without (C) acute pindolol treatment (15 mg/day) at sea level, as well as during a 5-day period at high altitude (4,350 m, barometric pressure 450 mmHg). During sea-level exercise, pindolol caused a reduction in plasma renin activity (PRA, 2.83 +/- 0.35 vs. 5.13 +/- 0.7 ng ANG I.ml-1.h-1, P less than 0.01), an increase in plasma alpha-atrial natriuretic factor (alpha-ANF) level (23.1 +/- 2.9 (P) vs. 10.4 +/- 1.5 (C) pmol/1, P less than 0.01), and no change in plasma aldosterone concentration [0.50 +/- 0.04 (P) vs. 0.53 +/- 0.03 (C) nmol/1]. Compared with sea-level values, PRA (3.45 +/- 0.7 ng ANG I.ml-1.h-1) and PA (0.39 +/- 0.03 nmol/1) were significantly lower (P less than 0.05) during exercise at high altitude. alpha-ANF was not affected by hypoxia. When beta-blockade was achieved at high altitude, exercise-induced elevation in PRA was completely abolished, but no additional decline in PA occurred. Plasma norepinephrine and epinephrine concentrations tended to be lower during maximal exercise at altitude; however, these differences were not statistically significant. Our results provide further evidence that hypoxia has a suppressive effect on the renin-aldosterone system. However, beta-adrenergic mechanisms do not appear to be responsible for inhibition of renin secretion at high altitude.
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Affiliation(s)
- P Bouissou
- ARPE Faculté de Médecine Créteil, Institut National de la Santé et de la Recherche Médicale U296, Paris, France
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Devaux F, Herbelin P, Acezat F, Goizel C. A fully automated system using a microcomputer for the hypertensive activity assays of drugs in the anesthetized rat. J Pharmacol Methods 1987; 18:69-80. [PMID: 3626568 DOI: 10.1016/0160-5402(87)90018-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A complete system is described for the computerized automation of the determination of activity of hypertensive drugs in the anesthetized rat. The microcomputer used was the Apple IIe, and the automation was performed by a purpose-designed command module. The series of injections of hypertensive drugs was controlled by the microcomputer through the intermediary of the command module. All processing of the signal (hypertension peak), calculation of the data obtained, statistical processing, and archive storage of the results was carried out entirely by the microcomputer. The computer was able unaided to control three work stations simultaneously without requiring synchronization.
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