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Mroueh A, Fakih W, Carmona A, Trimaille A, Matsushita K, Marchandot B, Qureshi AW, Gong DS, Auger C, Sattler L, Reydel A, Hess S, Oulehri W, Vollmer O, Lessinger JM, Meyer N, Pieper MP, Jesel L, Bäck M, Schini-Kerth V, Morel O. COVID-19 promotes endothelial dysfunction and thrombogenicity: role of proinflammatory cytokines/SGLT2 prooxidant pathway. J Thromb Haemost 2024; 22:286-299. [PMID: 37797691 DOI: 10.1016/j.jtha.2023.09.022] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Revised: 09/18/2023] [Accepted: 09/21/2023] [Indexed: 10/07/2023]
Abstract
BACKGROUND COVID-19 is associated with an increased risk of cardiovascular complications. Although cytokines have a predominant role in endothelium damage, the precise molecular mechanisms are far from being elucidated. OBJECTIVES The present study hypothesized that inflammation in patients with COVID-19 contributes to endothelial dysfunction through redox-sensitive SGLT2 overexpression and investigated the protective effect of SGLT2 inhibition by empagliflozin. METHODS Human plasma samples were collected from patients with acute, subacute, and long COVID-19 (n = 100), patients with non-COVID-19 and cardiovascular risk factors (n = 50), and healthy volunteers (n = 25). Porcine coronary artery endothelial cells (ECs) were incubated with plasma (10%). Protein expression levels were determined using Western blot analyses and immunofluorescence staining, mRNA expression by quantitative reverse transcription-polymerase chain reaction, and the level of oxidative stress by dihydroethidium staining. Platelet adhesion, aggregation, and thrombin generation were determined. RESULTS Increased plasma levels of interleukin (IL)-1β, IL-6, tumor necrosis factor-α, monocyte chemoattractant protein-1, and soluble intercellular adhesion molecule-1 were observed in patients with COVID-19. Exposure of ECs to COVID-19 plasma with high cytokines levels induced redox-sensitive upregulation of SGLT2 expression via proinflammatory cytokines IL-1β, IL-6, and tumor necrosis factor-α which, in turn, fueled endothelial dysfunction, senescence, NF-κB activation, inflammation, platelet adhesion and aggregation, von Willebrand factor secretion, and thrombin generation. The stimulatory effect of COVID-19 plasma was blunted by neutralizing antibodies against proinflammatory cytokines and empagliflozin. CONCLUSION In patients with COVID-19, proinflammatory cytokines induced a redox-sensitive upregulation of SGLT2 expression in ECs, which in turn promoted endothelial injury, senescence, platelet adhesion, aggregation, and thrombin generation. SGLT2 inhibition with empagliflozin appeared as an attractive strategy to restore vascular homeostasis in COVID-19.
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Affiliation(s)
- Ali Mroueh
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Walaa Fakih
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Adrien Carmona
- Division of Cardiovascular Medicine, Strasbourg University Hospital, Strasbourg, France
| | - Antonin Trimaille
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France; Division of Cardiovascular Medicine, Strasbourg University Hospital, Strasbourg, France. https://twitter.com/A_Trimaille
| | - Kensuke Matsushita
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France; Division of Cardiovascular Medicine, Strasbourg University Hospital, Strasbourg, France
| | - Benjamin Marchandot
- Division of Cardiovascular Medicine, Strasbourg University Hospital, Strasbourg, France
| | - Abdul Wahid Qureshi
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Dal-Seong Gong
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Cyril Auger
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Laurent Sattler
- Department Laboratory Haematology, Centre for Thrombosis and Haemostasis, Strasbourg University Hospital, Strasbourg, France
| | - Antje Reydel
- Division of Cardiovascular Medicine, Strasbourg University Hospital, Strasbourg, France
| | - Sébastien Hess
- Division of Cardiovascular Medicine, Strasbourg University Hospital, Strasbourg, France
| | - Walid Oulehri
- Department of Critical Care, Strasbourg University Hospital, Strasbourg, France
| | - Olivier Vollmer
- Department of Immunology and Internal Medicine, Strasbourg University Hospital, Strasbourg, France
| | - Jean-Marc Lessinger
- Biochemistry and Molecular Biology Laboratory, Strasbourg University Hospital, Strasbourg, France
| | - Nicolas Meyer
- Department of Biostatistics, Strasbourg University Hospital, Strasbourg, France
| | | | - Laurence Jesel
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France; Division of Cardiovascular Medicine, Strasbourg University Hospital, Strasbourg, France
| | - Magnus Bäck
- Department of Cardiology, Karolinska University Hospital, Stockholm, Sweden; Section of Translational Cardiology, Department of Medicine, Solna, Karolinska Institutet, Stockholm, Sweden; Institut National de la Sante et de la Recherche Medicale U1116, Université de Lorraine, Nancy, France
| | - Valérie Schini-Kerth
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France.
| | - Olivier Morel
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France; Division of Cardiovascular Medicine, Strasbourg University Hospital, Strasbourg, France; Department Laboratory Haematology, Centre for Thrombosis and Haemostasis, Strasbourg University Hospital, Strasbourg, France; Vietnam National Heart Institute, Bach Mai Hospital, Hanoi, Vietnam.
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Velay A, Gallais F, Wendling MJ, Bayer S, Reix N, Schneider A, Glady L, Collongues N, Lessinger JM, Hansmann Y, Kling-Pillitteri L, De Sèze J, Gonzalez M, Schmidt-Mutter C, Meyer N, Fafi-Kremer S. COVID-19 exposure in SARS-CoV-2-seropositive hospital staff members during the first pandemic wave at Strasbourg University Hospital, France. Infect Dis Now 2021; 52:23-30. [PMID: 34775140 PMCID: PMC8582228 DOI: 10.1016/j.idnow.2021.11.002] [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] [Received: 06/23/2021] [Revised: 08/23/2021] [Accepted: 11/09/2021] [Indexed: 11/21/2022]
Abstract
Objectives Strasbourg University Hospital faced an important COVID-19 first wave from early March 2020. We performed a longitudinal prospective cohort study to describe clinical and virological data, exposure history to COVID-19, and adherence to strict hygiene standards during the first pandemic wave in 1497 workers undergoing a SARS-CoV-2 serological test at our hospital, with a follow up of serology result three months later. Patients and Methods A total of 1497 patients were enrolled from April 6 to May 7, 2020. Antibody response to SARS-CoV-2 was measured, and COVID-19 exposure routes were analyzed according to SARS-CoV-2 serological status. Results A total of 515 patients (34.4%) were seropositive, mainly medical students (13.2%) and assistant nurses (12.0%). A history of COVID-19 exposure in a professional and/or private setting was mentioned by 83.1% of seropositive subjects (P < 0.05; odds ratio [OR]: 2.5; 95% confidence interval [CI]: 1.8–3.4). COVID-19 exposure factors associated with seropositive status were non-professional exposure (OR: 1.9, 95% CI: 1.3–2.7), especially outside the immediate family circle (OR: 2.2, 95% CI: 1.2–3.9) and contact with a COVID-19 patient (OR: 1.6; 95% CI: 1.1–2.2). Among professionally exposed workers, systematic adherence to strict hygiene standards was well observed, except for the use of a surgical mask (P < 0.05, OR: 1.9, 95% CI: 1.3–2.8). Of those who reported occasionally or never wearing a surgical mask, nurses (25.7%), assistant nurses (16.2%), and medical students (11.7%) were predominant. Conclusion Infection of staff members during the first pandemic wave in our hospital occurred after both professional and private COVID-19 exposure, underlining the importance of continuous training in strict hygiene standards.
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Affiliation(s)
- Aurélie Velay
- Virology Laboratory and INSERM UMR_S 1109, Strasbourg University Hospital, 3, rue Koeberlé, 67000 Strasbourg, France; Strasbourg University, INSERM, IRM UMR-S 1109, 67000 Strasbourg, France.
| | - Floriane Gallais
- Virology Laboratory and INSERM UMR_S 1109, Strasbourg University Hospital, 3, rue Koeberlé, 67000 Strasbourg, France; Strasbourg University, INSERM, IRM UMR-S 1109, 67000 Strasbourg, France
| | - Marie-Josée Wendling
- Virology Laboratory and INSERM UMR_S 1109, Strasbourg University Hospital, 3, rue Koeberlé, 67000 Strasbourg, France
| | - Sophie Bayer
- CHU de Strasbourg, Laboratoire de Biochimie Clinique et Biologie Moléculaire, 67091 Strasbourg, France
| | - Nathalie Reix
- CHU de Strasbourg, Laboratoire de Biochimie Clinique et Biologie Moléculaire, 67091 Strasbourg, France
| | - Anne Schneider
- CHU de Strasbourg, Département de Génétique Moléculaire du cancer, 67091 Strasbourg, France
| | - Ludovic Glady
- CHU de Strasbourg, Laboratoire de Biochimie Clinique et Biologie Moléculaire, 67091 Strasbourg, France
| | - Nicolas Collongues
- Centre d'investigation Clinique INSERM 1434, CHU Strasbourg, Strasbourg, France
| | - Jean-Marc Lessinger
- CHU de Strasbourg, Laboratoire de Biochimie Clinique et Biologie Moléculaire, 67091 Strasbourg, France
| | - Yves Hansmann
- CHU de Strasbourg, Service des maladies infectieuses et tropicales, 67091 Strasbourg, France
| | | | - Jérome De Sèze
- Centre d'investigation Clinique INSERM 1434, CHU Strasbourg, Strasbourg, France
| | - Maria Gonzalez
- CHU de Strasbourg, Service de santé au travail du personnel hospitalier, 67091 Strasbourg, France; CHU de Strasbourg, Service de Pathologies Professionnelles, Strasbourg, France
| | | | - Nicolas Meyer
- CHU de Strasbourg, Service de santé Publique, GMRC, 67091 Strasbourg, France
| | - Samira Fafi-Kremer
- Virology Laboratory and INSERM UMR_S 1109, Strasbourg University Hospital, 3, rue Koeberlé, 67000 Strasbourg, France; Strasbourg University, INSERM, IRM UMR-S 1109, 67000 Strasbourg, France
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Gallais F, Gantner P, Bruel T, Velay A, Planas D, Wendling MJ, Bayer S, Solis M, Laugel E, Reix N, Schneider A, Glady L, Panaget B, Collongues N, Partisani M, Lessinger JM, Fontanet A, Rey D, Hansmann Y, Kling-Pillitteri L, Schwartz O, De Sèze J, Meyer N, Gonzalez M, Schmidt-Mutter C, Fafi-Kremer S. Evolution of antibody responses up to 13 months after SARS-CoV-2 infection and risk of reinfection. EBioMedicine 2021; 71:103561. [PMID: 34455390 PMCID: PMC8390300 DOI: 10.1016/j.ebiom.2021.103561] [Citation(s) in RCA: 130] [Impact Index Per Article: 43.3] [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: 06/02/2021] [Revised: 08/04/2021] [Accepted: 08/16/2021] [Indexed: 11/26/2022] Open
Abstract
Background Assessment of the kinetics of SARS-CoV-2 antibodies is essential in predicting risk of reinfection and durability of vaccine protection. Methods This is a prospective, monocentric, longitudinal, cohort clinical study. Healthcare workers (HCW) from Strasbourg University Hospital were enrolled between April 6th and May 7th, 2020 and followed up to 422 days. Serial serum samples were tested for antibodies against the Receptor Binding Domain (RBD) of the spike protein and nucleocapsid protein (N) to characterize the kinetics of SARS-CoV-2 antibodies and the incidence of reinfection. Live-neutralization assays were performed for a subset of samples before and after vaccination to analyze sensitivity to SARS-CoV-2 variants. Findings A total of 4290 samples from 393 convalescent COVID-19 and 916 COVID-19 negative individuals were analyzed. In convalescent individuals, SARS-CoV-2 antibodies followed a triphasic kinetic model with half-lives at month (M) 11–13 of 283 days (95% CI 231–349) for anti-N and 725 days (95% CI 623–921) for anti-RBD IgG, which stabilized at a median of 1.54 log BAU/mL (95% CI 1.42–1.67). The incidence of SARS-CoV-2 infections was 12.22 and 0.40 per 100 person-years in COVID-19-negative and COVID-19-positive HCW, respectively, indicating a relative reduction in the incidence of SARS-CoV-2 reinfection of 96.7%. Live-virus neutralization assay revealed that after one year, variants D614G and B.1.1.7, but less so B.1.351, were sensitive to anti-RBD antibodies at 1.4 log BAU/mL, while IgG ≥ 2.0 log BAU/mL strongly neutralized all three variants. These latter anti-RBD IgG titers were reached by all vaccinated HCW regardless of pre-vaccination IgG levels and type of vaccine. Interpretation Our study demonstrates a long-term persistence of anti-RBD antibodies that may reduce risk of reinfection. By significantly increasing cross-neutralizing antibody titers, a single-dose vaccination strengthens protection against variants. Fun1ding None.
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Affiliation(s)
- Floriane Gallais
- CHU de Strasbourg, Laboratoire de Virologie, Strasbourg F-67091, France; Strasbourg University, INSERM, IRM UMR-S 1109, Strasbourg F-67000, France
| | - Pierre Gantner
- CHU de Strasbourg, Laboratoire de Virologie, Strasbourg F-67091, France; Strasbourg University, INSERM, IRM UMR-S 1109, Strasbourg F-67000, France
| | - Timothée Bruel
- Virus and Immunity Unit, Department of Virology, Institut Pasteur, Paris, France; CNRS UMR Paris 3569, France; Vaccine Research Institute, Creteil, France
| | - Aurélie Velay
- CHU de Strasbourg, Laboratoire de Virologie, Strasbourg F-67091, France; Strasbourg University, INSERM, IRM UMR-S 1109, Strasbourg F-67000, France
| | - Delphine Planas
- Virus and Immunity Unit, Department of Virology, Institut Pasteur, Paris, France; CNRS UMR Paris 3569, France; Vaccine Research Institute, Creteil, France
| | | | - Sophie Bayer
- CHU de Strasbourg, Laboratoire de Biochimie Clinique et Biologie Moléculaire, Strasbourg F-67091, France
| | - Morgane Solis
- CHU de Strasbourg, Laboratoire de Virologie, Strasbourg F-67091, France; Strasbourg University, INSERM, IRM UMR-S 1109, Strasbourg F-67000, France
| | - Elodie Laugel
- CHU de Strasbourg, Laboratoire de Virologie, Strasbourg F-67091, France; Strasbourg University, INSERM, IRM UMR-S 1109, Strasbourg F-67000, France
| | - Nathalie Reix
- CHU de Strasbourg, Laboratoire de Biochimie Clinique et Biologie Moléculaire, Strasbourg F-67091, France
| | - Anne Schneider
- CHU de Strasbourg, Département de Génétique Moléculaire du Cancer, Strasbourg F-67091, France
| | - Ludovic Glady
- CHU de Strasbourg, Laboratoire de Biochimie Clinique et Biologie Moléculaire, Strasbourg F-67091, France
| | - Baptiste Panaget
- CHU de Strasbourg, Laboratoire de Virologie, Strasbourg F-67091, France; Strasbourg University, INSERM, IRM UMR-S 1109, Strasbourg F-67000, France
| | - Nicolas Collongues
- CHU de Strasbourg, Center d'Investigation Clinique INSERM CIC 1434, Strasbourg F-67091, France
| | | | - Jean-Marc Lessinger
- CHU de Strasbourg, Laboratoire de Biochimie Clinique et Biologie Moléculaire, Strasbourg F-67091, France
| | - Arnaud Fontanet
- Department of Global Health, Emerging Diseases Epidemiology Unit, Institut Pasteur, Paris, France; PACRI Unit, Conservatoire National des Arts et Métiers, Paris, France
| | - David Rey
- CHU de Strasbourg, Trait d'Union, Strasbourg F-67091, France
| | - Yves Hansmann
- CHU de Strasbourg, Service des Maladies Infectieuses et Tropicales, Strasbourg F-67091, France
| | | | - Olivier Schwartz
- Virus and Immunity Unit, Department of Virology, Institut Pasteur, Paris, France; CNRS UMR Paris 3569, France; Vaccine Research Institute, Creteil, France
| | - Jérome De Sèze
- CHU de Strasbourg, Center d'Investigation Clinique INSERM CIC 1434, Strasbourg F-67091, France
| | - Nicolas Meyer
- CHU de Strasbourg, Service de santé Publique, GMRC, Strasbourg F-67091, France
| | - Maria Gonzalez
- CHU de Strasbourg, Service de Pathologies Professionnelles, Strasbourg F-67091, France
| | | | - Samira Fafi-Kremer
- CHU de Strasbourg, Laboratoire de Virologie, Strasbourg F-67091, France; Strasbourg University, INSERM, IRM UMR-S 1109, Strasbourg F-67000, France.
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Sabo AN, Jannier S, Becker G, Lessinger JM, Entz-Werlé N, Kemmel V. Sirolimus Pharmacokinetics Variability Points to the Relevance of Therapeutic Drug Monitoring in Pediatric Oncology. Pharmaceutics 2021; 13:pharmaceutics13040470. [PMID: 33808416 PMCID: PMC8067051 DOI: 10.3390/pharmaceutics13040470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 03/21/2021] [Accepted: 03/25/2021] [Indexed: 12/30/2022] Open
Abstract
Sirolimus is widely used in transplantation, where its therapeutic drug monitoring (TDM) is well established. Evidence of a crucial role for sirolimus in the PI3K/AkT/mTor pathway has stimulated interest in its involvement in neoplasia, either as monotherapy or in combination with other antineoplastic agents. However, in cancer, there is no consensus on sirolimus TDM. In the RAPIRI phase I trial, the combination sirolimus + irinotecan was evaluated as a new treatment for refractory pediatric cancers. Blood sampling at first sirolimus intake (D1) and at steady state (D8), followed by LC/MS2 analysis, was used to develop a population pharmacokinetic model (Monolix® software). A mono-compartmental model with first-order absorption and elimination best fit the data. The only covariate retained for the final model was “body surface area” (D1 and D8). The model also demonstrated that 1.5 mg/m2 would be the recommended sirolimus dose for further studies and that steady-state TDM is necessary to adjust the dosing regimen in atypical profiles (36.4% of the population). No correlation was found between sirolimus trough concentrations and efficacy and/or observed toxicities. The study reveals the relevance of sirolimus TDM in pediatric oncology as it is needed in organ transplantation.
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Affiliation(s)
- Amelia-Naomi Sabo
- Laboratoire de Biochimie et Biologie Moléculaire, Hôpitaux Universitaires de Strasbourg, 67200 Strasbourg, France; (A.-N.S.); (J.-M.L.)
- Laboratoire de Pharmacologie et Toxicologie Neurocardiovasculaire, Unité de Recherche 7296, Faculté de Médecine de Maïeutique et des Métiers de la Santé, Centre de Recherche en Biomédecine de Strasbourg (CRBS), 67085 Strasbourg, France;
| | - Sarah Jannier
- Unité d’Onco-Hématologie Pédiatrique, Hôpitaux Universitaires de Strasbourg, 67200 Strasbourg, France;
| | - Guillaume Becker
- Laboratoire de Pharmacologie et Toxicologie Neurocardiovasculaire, Unité de Recherche 7296, Faculté de Médecine de Maïeutique et des Métiers de la Santé, Centre de Recherche en Biomédecine de Strasbourg (CRBS), 67085 Strasbourg, France;
- Service de la Pharmacie, Hôpitaux Universitaires de Strasbourg, 67200 Strasbourg, France
| | - Jean-Marc Lessinger
- Laboratoire de Biochimie et Biologie Moléculaire, Hôpitaux Universitaires de Strasbourg, 67200 Strasbourg, France; (A.-N.S.); (J.-M.L.)
| | - Natacha Entz-Werlé
- Unité d’Onco-Hématologie Pédiatrique, Hôpitaux Universitaires de Strasbourg, 67200 Strasbourg, France;
- Unité Mixte de Recherche (UMR) 7021, Centre National de la Recherche Scientifique (CNRS), Laboratoire de Bioimagerie et Pathologies, Signalisation Tumorale et Cibles Thérapeutiques, Faculté de Pharmacie, Université de Strasbourg, 67401 Illkirch, France
- Correspondence: (N.E.-W.); (V.K.); Tel.: +33-(0)-3-8812-7533 (V.K.)
| | - Véronique Kemmel
- Laboratoire de Biochimie et Biologie Moléculaire, Hôpitaux Universitaires de Strasbourg, 67200 Strasbourg, France; (A.-N.S.); (J.-M.L.)
- Laboratoire de Pharmacologie et Toxicologie Neurocardiovasculaire, Unité de Recherche 7296, Faculté de Médecine de Maïeutique et des Métiers de la Santé, Centre de Recherche en Biomédecine de Strasbourg (CRBS), 67085 Strasbourg, France;
- Correspondence: (N.E.-W.); (V.K.); Tel.: +33-(0)-3-8812-7533 (V.K.)
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Park SH, Farooq MA, Gaertner S, Bruckert C, Qureshi AW, Lee HH, Benrahla D, Pollet B, Stephan D, Ohlmann P, Lessinger JM, Mayoux E, Auger C, Morel O, Schini-Kerth VB. Empagliflozin improved systolic blood pressure, endothelial dysfunction and heart remodeling in the metabolic syndrome ZSF1 rat. Cardiovasc Diabetol 2020; 19:19. [PMID: 32070346 PMCID: PMC7026972 DOI: 10.1186/s12933-020-00997-7] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 02/06/2020] [Indexed: 12/31/2022] Open
Abstract
Background Empagliflozin (empa), a selective sodium–glucose cotransporter (SGLT)2 inhibitor, reduced cardiovascular mortality and hospitalization for heart failure in patients with type 2 diabetes at high cardiovascular risk independent of glycemic control. The cardiovascular protective effect of empa was evaluated in an experimental model of metabolic syndrome, the obese ZSF1 rat, and its’ lean control. Methods Lean and obese ZSF1 rats were either non-treated or treated with empa (30 mg/kg/day) for 6 weeks. Vascular reactivity was assessed using mesenteric artery rings, systolic blood pressure by tail-cuff sphygmomanometry, heart function and structural changes by echocardiography, and protein expression levels by Western blot analysis. Results Empa treatment reduced blood glucose levels from 275 to 196 mg/dl in obese ZSF1 rats whereas normoglycemia (134 mg/dl) was present in control lean ZSF1 rats and was unaffected by empa. Obese ZSF1 rats showed increased systolic blood pressure, and blunted endothelium-dependent relaxations associated with the appearance of endothelium-dependent contractile responses (EDCFs) compared to control lean rats. These effects were prevented by the empa treatment. Obese ZSF1 rats showed increased weight of the heart and of the left ventricle volume without the presence of diastolic or systolic dysfunction, which were improved by the empa treatment. An increased expression level of senescence markers (p53, p21, p16), tissue factor, VCAM-1, SGLT1 and SGLT2 and a down-regulation of eNOS were observed in the aortic inner curvature compared to the outer one in the control lean rats, which were prevented by the empa treatment. In the obese ZSF1 rats, no such effects were observed. The empa treatment reduced the increased body weight and weight of lungs, spleen, liver and perirenal fat, hyperglycemia and the increased levels of total cholesterol and triglycerides in obese ZSF1 rats, and increased blood ketone levels and urinary glucose excretion in control lean and obese ZSF1 rats. Conclusion Empa reduced glucose levels by 28% and improved both endothelial function and cardiac remodeling in the obese ZSF1 rat. Empa also reduced the increased expression level of senescence, and atherothrombotic markers at arterial sites at risk in the control lean, but not obese, ZSF1 rat.
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Affiliation(s)
- Sin-Hee Park
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Muhammad Akmal Farooq
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Sébastien Gaertner
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France.,Hôpitaux Universitaires de Strasbourg, Service des Maladies Vasculaires - Hypertension Artérielle, Strasbourg, France
| | - Christophe Bruckert
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Abdul Wahid Qureshi
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Hyun-Ho Lee
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Djamel Benrahla
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Brigitte Pollet
- UMR CNRS 7021 Laboratoire de Bioimagerie et Pathologies, Strasbourg, France
| | - Dominique Stephan
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France.,Hôpitaux Universitaires de Strasbourg, Service des Maladies Vasculaires - Hypertension Artérielle, Strasbourg, France
| | - Patrick Ohlmann
- Hôpitaux Universitaires de Strasbourg, Service de Cardiologie, Strasbourg, France
| | - Jean-Marc Lessinger
- Laboratory of Biochemistry and Molecular Biology, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Eric Mayoux
- Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach, Germany
| | - Cyril Auger
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France
| | - Olivier Morel
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France.,Hôpitaux Universitaires de Strasbourg, Service de Cardiologie, Strasbourg, France
| | - Valérie B Schini-Kerth
- INSERM (French National Institute of Health and Medical Research), UMR 1260, Regenerative Nanomedicine, FMTS, Strasbourg, France.
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Glady L, Lavaux T, Charchour R, Lacorte JM, Lessinger JM. Interleukin-6 chemiluminescent immunoassay on Lumipulse G600 II: analytical evaluation and comparison with three other laboratory analyzers. ACTA ACUST UNITED AC 2020; 58:e229-e231. [DOI: 10.1515/cclm-2019-1145] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 12/05/2019] [Indexed: 01/31/2023]
Affiliation(s)
- Ludovic Glady
- Clinical Biochemistry and Molecular Biology Laboratory , University Hospital of Strasbourg , Strasbourg , France
| | - Thomas Lavaux
- Clinical Biochemistry and Molecular Biology Laboratory , University Hospital of Strasbourg , Strasbourg , France
| | - Rim Charchour
- Department of Endocrine and Oncologic Biochemistry, APHP , University Hospital Pitié-Salpêtrière , Paris , France
| | - Jean-Marc Lacorte
- Department of Endocrine and Oncologic Biochemistry, APHP , University Hospital Pitié-Salpêtrière , Paris , France
| | - Jean-Marc Lessinger
- Clinical Biochemistry and Molecular Biology Laboratory , University Hospital of Strasbourg , Strasbourg , France
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7
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Reix N, Lodi M, Jankowski S, Molière S, Luporsi E, Leblanc S, Scheer L, Ibnouhsein I, Benabu JC, Gabriele V, Guggiola A, Lessinger JM, Chenard MP, Alpy F, Bellocq JP, Neuberger K, Tomasetto C, Mathelin C. A novel machine learning-derived decision tree including uPA/PAI-1 for breast cancer care. Clin Chem Lab Med 2019; 57:901-910. [PMID: 30838840 DOI: 10.1515/cclm-2018-1065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 11/06/2018] [Indexed: 12/25/2022]
Abstract
Background uPA and PAI-1 are breast cancer biomarkers that evaluate the benefit of chemotherapy (CT) for HER2-negative, estrogen receptor-positive, low or intermediate grade patients. Our objectives were to observe clinical routine use of uPA/PAI-1 and to build a new therapeutic decision tree integrating uPA/PAI-1. Methods We observed the concordance between CT indications proposed by a canonical decision tree representative of French practices (not including uPA/PAI-1) and actual CT prescriptions decided by a medical board which included uPA/PAI-1. We used a method of machine learning for the analysis of concordant and non-concordant CT prescriptions to generate a novel scheme for CT indications. Results We observed a concordance rate of 71% between indications proposed by the canonical decision tree and actual prescriptions. Discrepancies were due to CT contraindications, high tumor grade and uPA/PAI-1 level. Altogether, uPA/PAI-1 were a decisive factor for the final decision in 17% of cases by avoiding CT prescription in two-thirds of cases and inducing CT in other cases. Remarkably, we noted that in routine practice, elevated uPA/PAI-1 levels seem not to be considered as a sufficient indication for CT for N≤3, Ki 67≤30% tumors, but are considered in association with at least one additional marker such as Ki 67>14%, vascular invasion and ER-H score <150. Conclusions This study highlights that in the routine clinical practice uPA/PAI-1 are never used as the sole indication for CT. Combined with other routinely used biomarkers, uPA/PAI-1 present an added value to orientate the therapeutic choice.
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Affiliation(s)
- Nathalie Reix
- Clinical Biologist, Laboratoire de Biochimie et Biologie Moléculaire, Hôpitaux Universitaires de Strasbourg, 1 place de l'Hôpital, Strasbourg, France.,ICube UMR 7357, Université de Strasbourg/CNRS, Fédération de Médecine Translationnelle de Strasbourg (FMTS), 4 rue Kirschleger, Strasbourg, France
| | - Massimo Lodi
- Unité de Sénologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Université de Strasbourg, Illkirch, France
| | | | - Sébastien Molière
- Service d'oncologie médicale, Centre Hospitalier Régional de Metz-Thionville, Hôpital de Mercy, Metz, France
| | - Elisabeth Luporsi
- Service d'oncologie médicale, Centre Hospitalier Régional de Metz-Thionville, Hôpital de Mercy, Metz, France
| | - Suzanne Leblanc
- Laboratoire de Biochimie et Biologie Moléculaire, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Service de Pathologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Louise Scheer
- Unité de Sénologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | | | | | - Victor Gabriele
- Unité de Sénologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | | | - Jean-Marc Lessinger
- Laboratoire de Biochimie et Biologie Moléculaire, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Marie-Pierre Chenard
- Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Université de Strasbourg, Illkirch, France.,Service de Pathologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Fabien Alpy
- Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Université de Strasbourg, Illkirch, France
| | - Jean-Pierre Bellocq
- Service de Pathologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | | | - Catherine Tomasetto
- Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Université de Strasbourg, Illkirch, France
| | - Carole Mathelin
- Unité de Sénologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Department of Functional Genomics and Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Université de Strasbourg, Illkirch, France.,Unité de Sénologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
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8
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Deprez L, Toussaint B, Zegers I, Schimmel H, Grote-Koska D, Klauke R, Gella FJ, Orth M, Lessinger JM, Trenti T, Nilsson G, Ceriotti F. Commutability Assessment of Candidate Reference Materials for Pancreatic α-Amylase. Clin Chem 2018; 64:1193-1202. [DOI: 10.1373/clinchem.2018.289744] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 05/23/2018] [Indexed: 12/18/2022]
Abstract
Abstract
BACKGROUND
Measurement standardization of the catalytic concentration of α-amylase in serum is based on 3 pillars: the primary reference measurement procedure (PRMP), reference laboratories, and suitable certified reference materials (CRMs). Commutability is a prerequisite when using a CRM for calibration and trueness control of routine methods or for value transfer from the PRMP to end-user calibrators of routine methods through a calibration hierarchy.
METHODS
We performed a commutability study with 30 serum pools and 5 candidate reference materials (RMs) for pancreatic α-amylase using an automated version of the PRMP and 5 different routine methods. Four candidate RMs had an artificial matrix, each with a different composition, and 1 candidate RM was based on human serum. Data were analyzed according to a linear regression analysis with prediction interval as described in the Clinical and Laboratory Standards Institute guideline EP30-A and a difference in bias analysis as described in the recommendations of the IFCC Working Group on Commutability.
RESULTS
The commutability profile of the 4 candidate RMs with an artificial matrix was variable. Only 1 candidate RM, with human serum albumin in the matrix, showed a good profile like that of the candidate RM based on serum. The comparison of both commutability assessment approaches indicated some differences because of inconclusive results for the difference in bias approach, suggesting a large uncertainty on the commutability assessment.
CONCLUSIONS
A CRM for pancreatic amylase in an artificial matrix can be commutable for routine methods using the same substrate as the PRMP, but the matrix composition is crucial.
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Affiliation(s)
- Liesbet Deprez
- European Commission's Joint Research Centre (JRC), Geel, Belgium
| | | | - Ingrid Zegers
- European Commission's Joint Research Centre (JRC), Geel, Belgium
| | - Heinz Schimmel
- European Commission's Joint Research Centre (JRC), Geel, Belgium
| | - Denis Grote-Koska
- Medizinische Hochschule Hannover, Institut für Klinische Chemie, Hannover, Germany
| | - Rainer Klauke
- Medizinische Hochschule Hannover, Institut für Klinische Chemie, Hannover, Germany
| | | | - Matthias Orth
- Vinzenz von Paul Kliniken gGmbH, Institut für Laboratoriumsmedizin, Stuttgart, Germany
- Ruprecht Karls Universität, Medizinische Fakultät Mannheim, Mannheim, Germany
| | - Jean-Marc Lessinger
- Laboratory of Biochemistry and Molecular Biology, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Tommaso Trenti
- Department of Laboratory Medicine and Pathology, Ospedale S. Agostino Estense, Modena, Italy
| | | | - Ferruccio Ceriotti
- Clinical Laboratory, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
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9
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Cordeanu EM, Gaertner S, Faller A, Mirea C, Lessinger JM, Kemmel V, Stephan D. Rifampicin reverses nicardipine effect inducing uncontrolled essential hypertension. Fundam Clin Pharmacol 2017; 31:587-589. [PMID: 28407303 DOI: 10.1111/fcp.12292] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [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: 11/30/2016] [Revised: 03/20/2017] [Accepted: 04/10/2017] [Indexed: 12/31/2022]
Abstract
Dihydropyridine calcium-channel blockers are a known substrate for the cytochrome P450 isoform 3A4. Rifampicin, an antitubercular agent, is one of the most potent inducers of hepatic and intestinal CYP3A4 thus increasing dihydropyridine metabolism. We report a case of a 67-year-old hypertensive female treated with a four-drug antihypertensive regimen including a dihydropyridine (nicardipine 50 mg bid), who was admitted for septic arthritis of the knee requiring antibiotic treatment with teicoplanin 400 mg od and rifampicin 600 mg bid. Six days after rifampicin initiation, she presented with Posterior Reversible Encephalopathy Syndrome due to uncontrolled hypertension. We hypothesized that disequilibrium of previously controlled hypertension was partially due to nicardipine ineffectiveness. Plasma nicardipine concentration was assessed through high-performance liquid chromatography 5 hours after coadministration of the two drugs and proved undetectable.
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Affiliation(s)
- Elena-Mihaela Cordeanu
- Department of Hypertension, Vascular Disease and Clinical Pharmacology, Strasbourg Regional University Hospital, Strasbourg, BP 426, 67091, France
| | - Sébastien Gaertner
- Department of Hypertension, Vascular Disease and Clinical Pharmacology, Strasbourg Regional University Hospital, Strasbourg, BP 426, 67091, France
| | - Alix Faller
- Department of Hypertension, Vascular Disease and Clinical Pharmacology, Strasbourg Regional University Hospital, Strasbourg, BP 426, 67091, France
| | - Corina Mirea
- Department of Hypertension, Vascular Disease and Clinical Pharmacology, Strasbourg Regional University Hospital, Strasbourg, BP 426, 67091, France
| | - Jean-Marc Lessinger
- Department of Biochemistry and Molecular Biology, Strasbourg Regional University Hospital, Strasbourg, BP 426, 67091, France
| | - Veronique Kemmel
- Department of Biochemistry and Molecular Biology, Strasbourg Regional University Hospital, Strasbourg, BP 426, 67091, France
| | - Dominique Stephan
- Department of Hypertension, Vascular Disease and Clinical Pharmacology, Strasbourg Regional University Hospital, Strasbourg, BP 426, 67091, France.,Regional Pharmacovigilance Centre, Strasbourg, BP 426, 67091, France
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10
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Krummel T, Prinz E, Metten MA, Borni-Duval C, Bazin-Kara D, Charlin E, Lessinger JM, Hannedouche T. Prognosis of patients with severe hyponatraemia is related not only to hyponatraemia but also to comorbidities and to medical management: results of an observational retrospective study. BMC Nephrol 2016; 17:159. [PMID: 27770791 PMCID: PMC5075397 DOI: 10.1186/s12882-016-0370-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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: 06/20/2016] [Accepted: 10/11/2016] [Indexed: 02/08/2023] Open
Abstract
Background The true cause of death in severe hyponatraemic patients remains controversial. The present study aimed to analyse the relationship between comorbidity, medical management and prognosis in severe hyponatraemic patients. Methods Medical records of all patients hospitalised in our institution in 2012 with a plasma sodium ≤120 mmol/l were retrospectively analysed. Results One hundred forty-seven of 64 723 adult patients (0.2 %) were identified with severe hyponatraemia. In-hospital mortality rate was 24.5 and 50.3 % after a median follow-up of 431 days. Patients with plasma sodium <110 mmol/l had less comorbidity (Charlson Comorbidity Index 2.2 ± 1.9 vs. 4.0 ± 3.1 (plasma sodium 110–115 mmol/l) and 4.2 ± 3.1 (plasma sodium 116–120 mmol/l); P = .02)) and a small trend for less mortality, respectively 40.0, 51.2 and 52.3 % (P = .64). At discharge, nonsurvivors and survivors had similar plasma sodium with 58.3 % of nonsurvivors being normonatraemic. Urine analysis was performed in 74.2 % of cases and associated with lower in-hospital mortality (20.2 % vs. 36.8 %, P = .05). In multivariate Cox analysis, mortality was significantly associated with plasma sodium normalisation (HR 0.35, P < 0.001), urine analysis (HR 0.48, P = .01), Charlson Comorbidity Index (HR 1.23, P < .001) and serum albumin (HR 0.88, P < .001). Conclusion Mortality in severe hyponatraemia appears mainly due to comorbidities although the latter are potentiated by hyponatraemia itself and its management thereby exacerbating the risk of death.
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Affiliation(s)
- Thierry Krummel
- Department of Nephrology and Dialysis, University Hospital, Strasbourg, France.
| | - Eric Prinz
- Department of Nephrology and Dialysis, University Hospital, Strasbourg, France
| | | | | | - Dorothée Bazin-Kara
- Department of Nephrology and Dialysis, University Hospital, Strasbourg, France
| | - Emmanuelle Charlin
- Department of Nephrology and Dialysis, University Hospital, Strasbourg, France
| | - Jean-Marc Lessinger
- Laboratory of Biochemistry and Molecular Biology, University Hospital, Strasbourg, France
| | - Thierry Hannedouche
- Department of Nephrology and Dialysis, University Hospital, Strasbourg, France.,School of Medicine, University of Strasbourg, Strasbourg, France
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11
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Kemmel V, Mercoli HA, Meyer N, Brumaru D, Romain B, Lessinger JM, Brigand C. Mitomycin C Pharmacokinetics as Predictor of Severe Neutropenia in Hyperthermic Intraperitoneal Therapy. Ann Surg Oncol 2015; 22 Suppl 3:S873-9. [DOI: 10.1245/s10434-015-4679-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Indexed: 11/18/2022]
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12
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Sharma KK, de Rocquigny H, Darlix JL, Lavergne JP, Pénin F, Lessinger JM, Mély Y. Analysis of the RNA chaperoning activity of the hepatitis C virus core protein on the conserved 3'X region of the viral genome. Nucleic Acids Res 2011; 40:2540-53. [PMID: 22127859 PMCID: PMC3315292 DOI: 10.1093/nar/gkr1140] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [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: 12/20/2022] Open
Abstract
The core protein of hepatitis c virus (HCV) is a structural protein with potent RNA chaperoning activities mediated by its hydrophilic N-terminal domain D1, which is thought to play a key role in HCV replication. To further characterize the core chaperoning properties, we studied the interactions between core D1 and the conserved HCV 3'X genomic region required for genome replication. To this end, we monitored the real-time annealing kinetics of native and mutated fluorescently labelled 16-nt palindromic sequence (DLS) and 27-nt Stem Loop II (SL2) from X with their respective complementary sequences. Core D1 and peptides consisting of the core basic domains were found to promote both annealing reactions and partly switch the loop-loop interaction pathway, which predominates in the absence of peptide, towards a pathway involving the stem termini. The chaperone properties of the core D1 peptides were found to be mediated through interaction of their basic clusters with the oligonucleotide phosphate groups, in line with the absence of high affinity site for core on HCV genomic RNA. The core ability to facilitate the interconversion between different RNA structures may explain how this protein regulates RNA structural transitions during HCV replication.
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Affiliation(s)
- Kamal Kant Sharma
- Laboratorie de Biophotonique et Pharmacologie, UMR 7213 CNRS, Faculté de Pharmacie, Université de Strasbourg, 74, Route du Rhin, 67401 Illkirch Cedex, France
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13
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Schumann G, Klauke R, Canalias F, Bossert-Reuther S, Franck PFH, Gella FJ, Jørgensen PJ, Kang D, Lessinger JM, Panteghini M, Ceriotti F. IFCC primary reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 °C. Part 9: reference procedure for the measurement of catalytic concentration of alkaline phosphatase International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) Scientific Division, Committee on Reference Systems of Enzymes (C-RSE) (1)). Clin Chem Lab Med 2011; 49:1439-46. [PMID: 21702699 DOI: 10.1515/cclm.2011.621] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract This paper is the ninth in a series dealing with reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 °C and the certification of reference preparations. Other parts deal with: Part 1. The concept of reference procedures for the measurement of catalytic activity concentrations of enzymes; Part 2. Reference procedure for the measurement of catalytic concentration of creatine kinase; Part 3. Reference procedure for the measurement of catalytic concentration of lactate dehydrogenase; Part 4. Reference procedure for the measurement of catalytic concentration of alanine aminotransferase; Part 5. Reference procedure for the measurement of catalytic concentration of aspartate aminotransferase; Part 6. Reference procedure for the measurement of catalytic concentration of γ-glutamyltransferase; Part 7. Certification of four reference materials for the determination of enzymatic activity of γ-glutamyltransferase, lactate dehydrogenase, alanine aminotransferase and creatine kinase at 37 °C; Part 8. Reference procedure for the measurement of catalytic concentration of α-amylase. The procedure described here is derived from the previously described 30 °C IFCC reference method. Differences are tabulated and commented on in Appendix 1.
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Affiliation(s)
- Gerhard Schumann
- Medizinische Hochschule Hannover, Institut für Klinische Chemie, Hannover, Germany
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14
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Schumann G, Canalias F, Joergensen PJ, Kang D, Lessinger JM, Klauke R, Committee On Reference Systems For Enzymes C-Rse, International Federation of Clinical Chemistry and Laboratory Medicine Scientific Division. IFCC reference procedures for measurement of the catalytic concentrations of enzymes: corrigendum, notes and useful advice. International Federation of Clinical Chemistry and Laboratory Medicine (IFCC)--IFCC Scientific Division. Clin Chem Lab Med 2010; 48:615-21. [PMID: 20298135 DOI: 10.1515/cclm.2010.137] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The primary reference measurement procedures (PRMPs) for the international standardization of catalytic concentration measurements of alpha-amylase, alanine aminotransferase, aspartate aminotransferase (AST), creatine kinase (CK), gamma-glutamyltransferase and lactate dehydrogenase have been performed in reference laboratories for several years. The IFCC Committee on Reference Systems for Enzymes and two reference laboratories, with official accreditation for the PRMPs, have collected useful information on some of the steps of the reference procedures that require special attention. This document comprises errata corrige for minor mistakes in published PRMPs for AST and CK. Several notes on the PRMPs are emphasized. This includes details that are very important for improved standardization, and general suggestions for reducing measurement uncertainty.
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Affiliation(s)
- Gerhard Schumann
- Institute for Clinical Chemistry, Medical School Hannover, Hannover, Germany.
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15
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Sharma KK, Didier P, Darlix JL, de Rocquigny H, Bensikaddour H, Lavergne JP, Pénin F, Lessinger JM, Mély Y. Kinetic analysis of the nucleic acid chaperone activity of the hepatitis C virus core protein. Nucleic Acids Res 2010; 38:3632-42. [PMID: 20167640 PMCID: PMC2887961 DOI: 10.1093/nar/gkq094] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [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: 12/15/2022] Open
Abstract
The multifunctional HCV core protein consists of a hydrophilic RNA interacting D1 domain and a hydrophobic D2 domain interacting with membranes and lipid droplets. The core D1 domain was found to possess nucleic acid annealing and strand transfer properties. To further understand these chaperone properties, we investigated how the D1 domain and two peptides encompassing the D1 basic clusters chaperoned the annealing of complementary canonical nucleic acids that correspond to the DNA sequences of the HIV-1 transactivation response element TAR and its complementary cTAR. The core peptides were found to augment cTAR-dTAR annealing kinetics by at least three orders of magnitude. The annealing rate was not affected by modifications of the dTAR loop but was strongly reduced by stabilization of the cTAR stem ends, suggesting that the core-directed annealing reaction is initiated through the terminal bases of cTAR and dTAR. Two kinetic pathways were identified with a fast pre-equilibrium intermediate that then slowly converts into the final extended duplex. The fast and slow pathways differed by the number of base pairs, which should be melted to nucleate the intermediates. The three peptides operate similarly, confirming that the core chaperone properties are mostly supported by its basic clusters.
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Affiliation(s)
- Kamal kant Sharma
- Laboratorie de Biophotonique et Pharmacologie, UMR 7213 CNRS, Faculté de Pharmacie, Université de Strasbourg, 74, Route du Rhin, 67401, Illkirch, Cedex, France
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16
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Gueye PM, Bertrand F, Duportail G, Lessinger JM. Extracellular haemoglobin, oxidative stress and quality of red blood cells relative to perioperative blood salvage. Clin Chem Lab Med 2010; 48:677-83. [DOI: 10.1515/cclm.2010.106] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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17
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Toussaint B, Emons H, Schimmel HG, Bossert-Reuther S, Canalias F, Ceriotti F, Férard G, Ferrero CA, Franck PF, Gella FJ, Henny J, Jørgensen PJ, Klauke R, Lessinger JM, Mazziotta D, Panteghini M, Ueda S, Schumann G. Traceability of values for catalytic activity concentration of enzymes: a Certified Reference Material for aspartate transaminase. Clin Chem Lab Med 2010; 48:795-803. [DOI: 10.1515/cclm.2010.146] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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18
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Julien-David D, Ennahar S, Miesch M, Geoffroy P, Raul F, Aoude-Werner D, Lessinger JM, Marchioni E. Effects of oxidation on the hydrolysis by cholesterol esterase of sitosteryl esters as compared to a cholesteryl ester. Steroids 2009; 74:832-6. [PMID: 19464305 DOI: 10.1016/j.steroids.2009.05.003] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Revised: 05/07/2009] [Accepted: 05/08/2009] [Indexed: 10/20/2022]
Abstract
Phytosteryl esters (PE) are used as ingredients in functional food to decrease plasma concentration of low density lipoprotein-cholesterol (LDL-C). Effective impairment of cholesterol absorption by PE suggests that these esters are hydrolyzed by the pancreatic cholesterol esterase (CEase, EC 3.1.1.13) and the liberated sterol may interfere with cholesterol reducing its intestinal absorption. PE-enriched foods are marketed for cooking purposes, and temperature is one of the most important factors leading to the formation of oxidation products. Very little is known about the outcome of PE oxides during the digestive process. A new analytical method based on mass spectrometric detection directly after enzymatic reaction was developed to determine in vitro the activity of CEase on PE and their oxides present in functional food. Using this method, we identified a new inhibitor of CEase: sitosteryl 9,10-dihydroxystearate, which behaves as a non-competitive inhibitor of the hydrolysis of cholesteryl oleate and sitosteryl oleate.
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Affiliation(s)
- Diane Julien-David
- IPHC, UMR 7178, Laboratoire de Chimie Analytique et Sciences de l'Aliment-Université de Strasbourg, Faculté de Pharmacie, 74 route de Rhin, 67640 Illkirch-Graffenstaden, France
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19
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Schumann G, Aoki R, Ferrero CA, Ehlers G, Férard G, Gella FJ, Jørgensen PJ, Kanno T, Kessner A, Klauke R, Kytzia HJ, Lessinger JM, Miller WG, Nagel R, Pauwels J, Schimmel H, Siekmann L, Weidemann G, Yoshida K, Ceriotti F. IFCC primary reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C. Clin Chem Lab Med 2006; 44:1146-55. [PMID: 16958612 DOI: 10.1515/cclm.2006.212] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This paper is the eighth in a series dealing with reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C and the certification of reference preparations. Other parts deal with: Part 1. The concept of reference procedures for the measurement of catalytic activity concentrations of enzymes; Part 2. Reference procedure for the measurement of catalytic concentration of creatine kinase; Part 3. Reference procedure for the measurement of catalytic concentration of lactate dehydrogenase; Part 4. Reference procedure for the measurement of catalytic concentration of alanine aminotransferase Part 5. Reference procedure for the measurement of catalytic concentration of aspartate aminotransferase Part 6. Reference procedure for the measurement of catalytic concentration of gamma-glutamyltransferase; Part 7. Certification of four reference materials for the determination of enzymatic activity of gamma-glutamyltransferase, lactate dehydrogenase, alanine aminotransferase and creatine kinase at 37 degrees C. The procedure described here is deduced from the previously described 30 degrees C IFCC reference method. Differences are tabulated and commented on.
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20
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Guéye PM, Glasser N, Férard G, Lessinger JM. Influence of human haptoglobin polymorphism on oxidative stress induced by free hemoglobin on red blood cells. Clin Chem Lab Med 2006; 44:542-7. [PMID: 16681422 DOI: 10.1515/cclm.2006.095] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [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: 11/15/2022]
Abstract
BACKGROUND An in vitro study was conducted to determine whether haptoglobin phenotypes differed in their protective effect against oxidative stress induced by extracellular hemoglobin on red blood cells. METHODS Conjugated dienes and thiobarbituric acid-reactive substances (TBARS) were determined in human red blood cell membranes in the presence of hemoglobin and various concentrations of each type of purified haptoglobin. In addition, the release of K+ and lactate dehydrogenase from red blood cells was measured. RESULTS A protective effect of haptoglobin was observed in terms of results obtained for the four parameters examined, with significant differences (p<0.001) between the three haptoglobin types; type 1-1 was the most active and type 2-2 the least active. A proportion of oxidative damage was not sensitive to haptoglobin, but to desferrioxamine (an iron chelator), indicating the participation of two actors, hemoglobin and free iron, in the oxidative stress of membrane lipids. CONCLUSIONS The antioxidant role of haptoglobin and the phenotype dependence were confirmed for preventing possible oxidative damage induced by free hemoglobin and iron release during its catabolism.
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Affiliation(s)
- Papa Madièye Guéye
- Institut Gilbert Laustriat, UMR 7175 CNRS, Université Louis Pasteur (Strasbourg I), Faculté de Pharmacie, 74 route du Rhin, BP 80024, 67401 Illkirch, France
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21
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Férard G, Piton A, Messous D, Imbert-Bismut F, Frairi A, Poynard T, Lessinger JM. Intermethod calibration of alanine aminotransferase (ALT) and γ-glutamyltransferase (GGT) results: application to Fibrotest® and Actitest® scores. Clin Chem Lab Med 2006; 44:400-6. [PMID: 16599832 DOI: 10.1515/cclm.2006.078] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractTwo multi-component scores (Fibrotest
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Affiliation(s)
- Georges Férard
- Faculté de Pharmacie, Université Louis Pasteur de Strasbourg, Illkirch, France
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22
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Courrier HM, Pons F, Lessinger JM, Frossard N, Krafft MP, Vandamme TF. In vivo evaluation of a reverse water-in-fluorocarbon emulsion stabilized with a semifluorinated amphiphile as a drug delivery system through the pulmonary route. Int J Pharm 2005; 282:131-40. [PMID: 15336388 DOI: 10.1016/j.ijpharm.2004.06.011] [Citation(s) in RCA: 13] [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] [Received: 01/26/2004] [Revised: 06/06/2004] [Accepted: 06/06/2004] [Indexed: 10/26/2022]
Abstract
The potential of a reverse water-in-fluorocarbon (w-in-FC) emulsion stabilized with a semifluorinated amphiphile, namely C8F17(CH2)11OP(O)[N(CH2CH2)2O]2 (F8H11DMP) for drug delivery through intrapulmonary administration was investigated in the mouse. This study involved assessment of the effect of single or repeated intranasal instillations of a plain emulsion on lung tissue integrity, and evaluation of blood glucose levels in mice treated with an insulin-loaded emulsion. When instilled intranasally to mice, the plain emulsion did not alter lung tissue integrity, as demonstrated by histological staining, and did not induce any airway inflammatory reaction. Treated mice exhibited decreased body weight within the 3-4 days that followed the first emulsion administration, but this decrease was reversible within few days. Mice instilled intranasally with the insulin-loaded emulsion displayed decreased blood glucose levels within the 20 min that followed the administration, thus demonstrating the potential of the reverse w-in-FC emulsion stabilized with F8H11DMP to systemically deliver drugs, including peptides, upon lung administration.
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Affiliation(s)
- H M Courrier
- UMR 7514, Laboratoire de Chimie Bioorganique, Faculté de Pharmacie, Université Louis Pasteur, 74 Route du Rhin, B.P. 60024, 67401 Illkirch Cedex, France
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23
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Férard G, Lessinger JM. [Forum: it is time for standardization in clinical enzymology]. Ann Biol Clin (Paris) 2005; 63:113-4. [PMID: 15712390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
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24
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Férard G, Imbert-Bismut F, Messous D, Piton A, Ueda S, Poynard T, Lessinger JM. A reference material for traceability of aspartate aminotransferase (AST) results. Clin Chem Lab Med 2005; 43:549-53. [PMID: 15899678 DOI: 10.1515/cclm.2005.095] [Citation(s) in RCA: 10] [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: 11/15/2022]
Abstract
AbstractStandardization of aspartate aminotransferase (AST) determination is highly desirable for inter-laboratory comparison. Serum AST mean values for 20 patients suffering from viral hepatitis showed an inter-laboratory (n=13) variation of 9.4%. Part of this variation was due to two laboratories using procedures without pyridoxal-5′-phosphate. A traceable AST value was assigned to an enzyme calibrator (EC) through the appropriate International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) primary reference procedure. The EC was commutable for seven routine methods. Common calibration using the EC reduced the inter-laboratory coefficient of variation (CV=5.9%
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Affiliation(s)
- Georges Férard
- Laboratoire de Biochimie Appliquée de la Faculté de Pharmacie et Laboratoire du Centre de Traumatologie et d'Orthopédie, Université Louis Pasteur de Strasbourg, Illkirch, France.
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25
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Férard G, Imbert-Bismut F, Messous D, Piton A, Abella A, Burnat P, Hainque B, Glasser N, Lessinger JM. [Influence of pyridoxal phosphate in measuring aminotransferases activities in patients with viral hepatitis]. Ann Biol Clin (Paris) 2004; 62:717-20. [PMID: 15563433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2004] [Accepted: 06/25/2004] [Indexed: 05/01/2023]
Abstract
Effect of a pyridoxal phosphate (PP) supplementation of reagents used for ALT and AST measurement was studied in serum of 20 patients suffering from viral hepatitis. Measurements of enzyme activities were carried out at 37 degrees C, using an automate (AU 600, Olympus). Significant differences (p < 0.0001) were observed both for ALT and AST, meanwhile they were more marked for ALT than for AST. This difference was associated with a strong interindividual variability regarding PP activation effect on ALT. In conclusion, aminotransferase measurements should be carried out with a reagent supplemented with PP, when the enzyme activity is used to evaluate a cytolysis. The same recommendation applies when ALT results are integrated into various combinations developed for the evaluation of liver status.
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Affiliation(s)
- G Férard
- Laboratoire de biochimie appliquée de la faculté de pharmacie et Laboratoire du centre de traumatologie et d'orthopédie, Université Louis Pasteur de Strasbourg, Illkirch.
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26
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Lessinger JM, Parashou S, Arzoglou P, Ramos P, Chapus C, Dufaux J, Junge W, Profilis C, Férard G. Determination of lipase catalytic activity in two reference materials: BCR 693 and BCR 694 by titrimetry at constant pH. ACTA ACUST UNITED AC 2004; 42:62-6. [PMID: 15061382 DOI: 10.1515/cclm.2004.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractBecause routine assays for pancreatic lipase catalytic activity are not yet standardized, between-method comparability is very poor. This is mainly due to the lack of reference materials (RMs). The aim of this study was to assign values of catalytic concentration to two human pancreatic lipase RMs, one prepared from human pancreatic juice (BCR 693), the other obtained by recombinant technology (BCR 694). Lipase catalytic activity was assayed in five experienced laboratories, using aliquots from the same lot of triolein emulsion and a standardized titrimetric procedure, optimized with regard to substrate, cofactors and pH. The accepted sets of data (n=4) gave a mean ± the corresponding uncertainty expressed as the 0.95 confidence interval of 1732±72 U/l and 1043±60 U/l for BCR 693 and 694, respectively. Transferability of the whole operating procedure proved to be quite satisfactory. The authors conclude that both RMs can be used to verify the correct implementation of the standardized measurement procedure and to assign values to secondary lipase materials (commercial calibrators, control products) which, in turn, ensures traceability to the standardized procedure in this study, and contributes to the harmonization of laboratory results according to the Directive for in vitro Diagnostic Medical Devices.
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Affiliation(s)
- Jean-Marc Lessinger
- Laboratoire de Biochimie appliquée, Faculté de Pharmacie, Université Louis Pasteur, Illkirch, France.
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Schumann G, Bonora R, Ceriotti F, Férard G, Ferrero CA, Franck PFH, Gella FJ, Hoelzel W, Jørgensen PJ, Kanno T, Kessner A, Klauke R, Kristiansen N, Lessinger JM, Linsinger TPJ, Misaki H, Panteghini M, Pauwels J, Schiele F, Schimmel HG, Weidemann G, Siekmann L. IFCC primary reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C. International Federation of Clinical Chemistry and Laboratory Medicine. Part 4. Reference procedure for the measurement of catalytic concentration of alanine aminotransferase. Clin Chem Lab Med 2003; 40:718-24. [PMID: 12241021 DOI: 10.1515/cclm.2002.124] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This paper is the fourth in a series dealing with reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C and the certification of reference preparations. Other parts deal with: Part 1. The Concept of Reference Procedures for the Measurement of Catalytic Activity Concentrations of Enzymes; Part 2. Reference Procedure for the Measurement of Catalytic Concentration of Creatine Kinase; Part 3. Reference Procedure for the Measurement of Catalytic Concentration of Lactate Dehydrogenase; Part 5. Reference Procedure for the Measurement of Catalytic Concentration of Aspartate Aminotransferase; Part 6. Reference Procedure for the Measurement of Catalytic Concentration of Gamma-Glutamyltransferase; Part 7. Certification of Four Reference Materials for the Determination of Enzymatic Activity of Gamma-Glutamyltransferase, Lactate Dehydrogenase, Alanine Aminotransferase and Creatine Kinase at 37 degrees C. A document describing the determination of preliminary upper reference limits is also in preparation. The procedure described here is deduced from the previously described 30 degrees C IFCC reference method. Differences are tabulated and commented on in Appendix 2.
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Schumann G, Bonora R, Ceriotti F, Férard G, Ferrero CA, Franck PFH, Gella FJ, Hoelzel W, Jørgensen PJ, Kanno T, Kessner A, Klauke R, Kristiansen N, Lessinger JM, Linsinger TPJ, Misaki H, Panteghini M, Pauwels J, Schiele F, Schimmel HG, Weidemann G, Siekmann L. IFCC primary reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C. International Federation of Clinical Chemistry and Laboratory Medicine. Part 5. Reference procedure for the measurement of catalytic concentration of aspartate aminotransferase. Clin Chem Lab Med 2003; 40:725-33. [PMID: 12241022 DOI: 10.1515/cclm.2002.125] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [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: 11/15/2022]
Abstract
This paper is the fifth in a series dealing with reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C and the certification of reference preparations. Other parts deal with: Part 1. The Concept of Reference Procedures for the Measurement of Catalytic Activity Concentrations of Enzymes; Part 2. Reference Procedure for the Measurement of Catalytic Concentration of Creatine Kinase; Part 3. Reference Procedure for the Measurement of Catalytic Concentration of Lactate Dehydrogenase; Part 4. Reference Procedure for the Measurement of Catalytic Concentration of Alanine Aminotransferase; Part 6. Reference Procedure for the Measurement of Catalytic Concentration of Gamma-Glutamyltransferase; Part 7. Certification of Four Reference Materials for the Determination of Enzymatic Activity of Gamma-Glutamyltransferase, Lactate Dehydrogenase, Alanine Aminotransferase and Creatine Kinase at 37 degrees C. A document describing the determination of preliminary upper reference limits is also in preparation. The procedure described here is deduced from the previously described 30 degrees C IFCC reference method. Differences are tabulated and commented on in Appendix 3.
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Lessinger JM, Arzoglou P, Ramos P, Visvikis A, Parashou S, Calam D, Profilis C, Férard G. Preparation and characterization of reference materials for human pancreatic lipase: BCR 693 (from human pancreatic juice) and BCR 694 (recombinant). Clin Chem Lab Med 2003; 41:169-76. [PMID: 12667003 DOI: 10.1515/cclm.2003.028] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
There is a lack of certified reference material (CRM) for lipase catalytic activity. Consequently between-method comparability is very poor. The aim of this study was to produce two lipase CRMs, one from human pancreatic juice (BCR 693), and another using recombinant technologies (BCR 694). Lipase was purified from pancreatic juice, using column chromatography and isoelectric focusing. Recombinant lipase was produced with a transfected cell line and purified with column chromatography. Adding buffered bovine serum albumin and subsequent freeze-drying were used to stabilize both materials. A standardized titrimetric method was employed to compare their catalytic properties to those of two plasma pools of patients suffering from acute pancreatitis. About 5 kU (titrimetry, 37 degrees C) of each material were obtained. They were lyophilized without apparent modifications of their catalytic properties, which stayed identical to those exhibited by the enzyme present in patient's pools. Stability of both materials was estimated at several years when stored in a dry form at -20 degrees C. Both materials appear to have similar catalytic properties and stability and were found commutable as regards a reference method and a routine measurement procedure. An international certification campaign will be carried out to assign values to BCR 693 and BCR 694.
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Affiliation(s)
- Jean-Marc Lessinger
- Laboratoire de Biochimie appliquée, UFR de Sciences Pharmaceutiques, Université Louis Pasteur, Illkirch, France.
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Abstract
The commutability of 13 control materials was evaluated by performing parallel measurements on two different analysers: a Synchron CX-5 Delta from Beckman-Coulter and a Vitros 950 from Ortho-Clinical Diagnostics. Twenty three clinical chemistry analytes (substrates, electrolytes and enzymatic activities) were determined in plasma from 15 different patients in order to define intermethod relationship for each analyte. The relationship observed for each control material was compared to those obtained for patients' specimens. The results show that commutability depends both on the tested analyte and on the control material. No totally commutable material has been found for the whole set of tested parameters. Most control materials were commutable for inorganic phosphate, glucose, chloride, triglycerides, alanine aminotransferase, amylase and y-glutamyltransfera-se, but less than a quarter of control materials were commutable for sodium, calcium, creatinine, alkaline phosphatase and lipase. Seven materials were commutable for more than half of the analytes, whereas five control materials were commutable for less than a quarter of these analytes. We propose to verify the commutability of materials before their use in an external quality control assessement.
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Affiliation(s)
- Emmanuel Brion
- Laboratoire de Biochimie appliquée, UFR des Sciences Pharmaceutiques, Université Louis Pasteur de Strasbourg, Ilkirch, France
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Schumann G, Bonora R, Ceriotti F, Clerc-Renaud P, Ferrero CA, Férard G, Franck PFH, Gella FJ, Hoelzel W, Jørgensen PJ, Kanno T, Kessner A, Klauke R, Kristiansen N, Lessinger JM, Linsinger TPJ, Misaki H, Panteghini M, Pauwels J, Schimmel HG, Vialle A, Weidemann G, Siekmann L. IFCC primary reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C. Part 3. Reference procedure for the measurement of catalytic concentration of lactate dehydrogenase. Clin Chem Lab Med 2002; 40:643-8. [PMID: 12211663 DOI: 10.1515/cclm.2002.111] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [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: 11/15/2022]
Abstract
This paper is the third in a series dealing with reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C and the certification of reference preparations. Other parts deal with: Part 1. The Concept of Reference Procedures for the Measurement of Catalytic Activity Concentrations of Enzymes; Part 2. Reference Procedure for the Measurement of Catalytic Concentration of Creatine Kinase; Part 4. Reference Procedure for the Measurement of Catalytic Concentration of Alanine Aminotransferase; Part 5. Reference Procedure for the Measurement of Catalytic Concentration of Aspartate Aminotransferase; Part 6. Reference Procedure for the Measurement of Catalytic Concentration of gamma-Glutamyltransferase; Part 7. Certification of Four Reference Materials tamyltransferase, Lactate Dehydrogenase, Alanine Aminotransferase and Creatine Kinase at 37 degrees C. A document describing the determination of preliminary upper reference limits is also in preparation. The procedure described here is deduced from the previously described 30 degrees C IFCC reference method (1). Differences are tabulated and commented on in Appendix 1.
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Siekmann L, Bonora R, Burtis CA, Ceriotti F, Clerc-Renaud P, Férard G, Ferrero CA, Forest JC, Franck PFH, Gella FJ, Hoelzel W, Jørgensen PJ, Kanno T, Kessner A, Klauke R, Kristiansen N, Lessinger JM, Linsinger TPJ, Misaki H, Mueller MM, Panteghini M, Pauwels J, Schiele F, Schimmel HG, Vialle A, Weidemann G, Schumann G. IFCC primary reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C. Part 1. The concept of reference procedures for the measurement of catalytic activity concentrations of enzymes. Clin Chem Lab Med 2002; 40:631-4. [PMID: 12211661 DOI: 10.1515/cclm.2002.109] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [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: 11/15/2022]
Abstract
This paper is the first in a series dealing with reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C and with the certification of reference preparations. Other parts deal with: Part 2. Reference Procedure for the Measurement of Catalytic Concentration of Creatine Kinase; Part 3. Reference Procedure for the Measurement of Catalytic Concentration of Lactate Dehydrogenase; Part 4. Reference Procedure for the Measurement of Catalytic Concentration of Alanine Aminotransferase; Part 5. Reference Procedure for the Measurement of Catalytic Concentration of Aspartate Aminotransferase; Part 6. Reference Procedure for the Measurement of Catalytic fication of Four Reference Materials for the Determination of Enzymatic Activity of y-Glutamyltransferase, Lactate Dehydrogenase, Alanine Aminotransferase and Creatine Kinase at 37 degrees C. A document describing the determination of preliminary reference values is also in preparation.
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Affiliation(s)
- Lothar Siekmann
- Institut für Klinische Biochemie, Universität Bonn, Germany.
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Schumann G, Bonora R, Ceriotti F, Clerc-Renaud P, Ferrero CA, Férard G, Franck PFH, Gella FJ, Hoelzel W, Jørgensen PJ, Kanno T, Kessne A, Klauker R, Kristiansen N, Lessinger JM, Linsinger TPJ, Misaki H, Panteghini M, Pauwels J, Schimmel HG, Vialle A, Weidemann G, Siekmann L. IFCC primary reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C. Part 2. Reference procedure for the measurement of catalytic concentration of creatine kinase. Clin Chem Lab Med 2002; 40:635-42. [PMID: 12211662 DOI: 10.1515/cclm.2002.110] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [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: 11/15/2022]
Abstract
This paper is the second in a series dealing with reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C and the certification of reference preparations. Other parts deal with: Part 1. The Concept of Reference Procedures for the Measurement of Catalytic Activity Concentrations of Enzymes; Part 3. Reference Procedure for the Measurement of Catalytic Concentration of Lactate Dehydrogenase; Part 4. Reference Procedure for the Measurement of Catalytic Concentration of Alanine Aminotransferase; Part 5. Reference Procedure for the Measurement of Catalytic Concentration of Aspartate Aminotransferase; Part 6. Reference Procedure for the Measurement of Catalytic Concentration of gamma-Glutamyltransferase; Part 7. Certification of Four Reference Materials for the Determination of Enzymatic Activity of gamma-Glutamyltransferase, Lactate Dehydrogenase, Alanine Aminotransferase and Creatine Kinase at 37 degrees C. A document describing the determination of preliminary reference values is also in preparation. The pro- described 30 degrees C IFCC reference method (1). Differences are tabulated and commented on in Appendix 3.
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Lessinger JM, Schiele F, Vialle A, Férard G, Myara A, Guéchot J, Imbert-Bismut F, Lasnier E, Piton A, Voitot H. [Enzyme calibrators: principle and practical use]. Ann Biol Clin (Paris) 2002; 60:281-6. [PMID: 12050043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Results of catalytic activities of enzymes are highly dependent on the measurement procedures and on local conditions. Thus, only poorly marked improvement of interlaboratory comparability of results have been observed in clinical enzymology. To solve this problem, SFBC and IFCC have proposed to use "validated enzyme calibrators". Standardised operating procedures adapted to 37 C have been developed by IFCC for the most commonly used enzymes in clinical chemistry, and will be soon published. Reference materials which have been certified with these SOPs can be used as calibrators for a set of measurement methods which exhibit the same analytical specificity. Calibrators must be commutable, a property that must be checked experimentally. It is possible to produce stable and commutable materials for the calibration of a set of methods. Interest of this approach has been demonstrated for several enzymes. Results of two studies presented here show that the comparison of results to the upper limit of reference ranges does not improve the interlaboratory comparability of results in contrast to the calibration of different methods by a common calibrator which allowed to reach an interlaboratory CV close to 4% for ALT and gammaGT.
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Affiliation(s)
- J M Lessinger
- Laboratoire du CTO et Laboratoire de biochimie appliquée, Université Louis-Pasteur de Strasbourg, 10, avenue Baumann, 67401 Illkirch
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Siekmann L, Bonora R, Burtis CA, Ceriotti F, Clerc-Renaud P, Férard G, Ferrero CA, Forest JC, Franck PFH, Gella FJ, Hoelzel W, Jørgensen PJ, Kanno T, Kessner A, Klauke R, Kristiansen N, Lessinger JM, Linsinger TPJ, Misaki H, Mueller MM, Panteghini M, Pauwels J, Schiele F, Schimmel HG, Vialle A, Weidemann G, Schumann G. IFCC Primary Reference Procedures for the Measurement of Catalytic Activity Concentrations of Enzymes at 37°C. Part 7. Certification of Four Reference Materials for the Determination of Enzymatic Activity of γ-Glutamyltransferase, Lactate Dehydrogenase, Alanine Aminotransferase and Creatine Kinase according to IFCC Reference Procedures at 37°C. Clin Chem Lab Med 2002; 40:739-45. [PMID: 12241024 DOI: 10.1515/cclm.2002.127] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This paper is the seventh in a series dealing with reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C and the certification of reference preparations. Other parts deal with: Part 1. The Concept of Reference Procedures for the Measurement of Catalytic Activity Concentrations of Enzymes; Part 2. Reference Procedure for the Measurement of Catalytic Concentration of Creatine Kinase; Part 3. Reference Procedure for the Measurement of Catalytic Concentration of Lactate Dehydrogenase; Part 4. Reference Procedure for the Measurement of Catalytic Concentration of Alanine Aminotransferase; Part 5. Reference Procedure for the Measurement of Catalytic Concentration of Aspartate Aminotransferase; Part 6. Reference Procedure for the Measurement of Catalytic Concentration of Gamma-Glutamyltransferase. A document describing the determination of preliminary reference values is also in preparation. The certification of the catalytic activity concentrations as determined by the recently elaborated IFCC primary reference methods at 37 degrees C of four enzyme preparations, namely IRMM/IFCC 452 (gamma-glutamyltransferase), IRMM/IFCC 453 (lactate dehydrogenase 1), IRMM/IFCC 454 (alanine aminotransferase) and IRMM/IFCC 455 (creatine kinase) is described. Homogeneity data were derived from previous results. Stability was assessed using recently obtained data as well as data from previous stability studies. The collaborative study for value assignment was performed under a strict quality control scheme to ensure traceability to the primary reference method. Uncertainty of the materials was assessed in compliance with the Guide to the Expression of Uncertainty in Measurement. The certified values obtained at 37 degrees C are 1.90 microkat/l +/- 0.04 microkat/l (114.1 U/l +/- 2.4 U/l), for gamma-glutamyltransferase, 8.37 microkat/l +/- 0.12 microkat/l (502 U/l +/- 7 U/l), for lactate dehydrogenase 1, 3.09 microkat/l +/- 0.07 microkat/l (186 U/l +/- 4 U/l), for alanine aminotransferase and 1.68 microkat/l +/- 0.07 microkat/l (101 U/l +/- 4 U/l), for creatine kinase. The materials are intended for internal quality control as well as for the evaluation of test systems as required by recent European Union legislation. Furthermore, the materials can be used to transfer accuracy from a reference method to a routine procedure provided the procedures exhibit the same analytical specificity and the certified materials are commutable.
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36
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Schumann G, Bonora R, Ceriotti F, Férard G, Ferrero CA, Franck PFH, Gella FJ, Hoelzel W, Jørgensen PJ, Kanno T, Kessner A, Klauke R, Kristiansen N, Lessinger JM, Linsinger TPJ, Misaki H, Panteghini M, Pauwels J, Schiele F, Schimmel HG, Weidemann G, Siekmann L. IFCC Primary Reference Procedures for the Measurement of Catalytic Activity Concentrations of Enzymes at 37C. Part 6. Reference Procedure for the Measurement of Catalytic Concentration of γ-Glutamyltransferase. Clin Chem Lab Med 2002; 40:734-8. [PMID: 12241023 DOI: 10.1515/cclm.2002.126] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [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: 11/15/2022]
Abstract
This paper is the sixth in a series dealing with reference procedures for the measurement of catalytic activity concentrations of enzymes at 37 degrees C and the certification of reference preparations. Other parts deal with: Part 1. The Concept of Reference Procedures for the Measurement of Catalytic Activity Concentrations of Enzymes; Part 2. Reference Procedure for the Measurement of Catalytic Concentration of Creatine Kinase; Part 3. Reference Procedure for the Measurement of Catalytic Concentration of Lactate Dehydrogenase; Part 4. Reference Procedure for the Measurement of Catalytic Concentration of Alanine Aminotransferase; Part 5. Reference Procedure for the Measurement of Catalytic Concentration of Aspartate Aminotransferase; Part 7. Certification of Four Reference Materials for the Determination of Enzymatic Activity of Gamma-Glutamyltransferase, Lactate Dehydrogenase, Alanine Aminotransferase and Creatine Kinase at 37 degrees C A document describing the determination of preliminary upper reference limits is also in preparation. The procedure described here is deduced from the previously described 30 degrees C IFCC reference method. Differences are tabulated and commented on in Appendix 1.
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37
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Schiele F, Férard G, Lessinger JM, Henny J. [Harmonization of practices: application to the measurement of enzymatic activities used in prevention, screening, diagnosis and therapeutic monitoring]. Ann Biol Clin (Paris) 2001; 59:291-7. [PMID: 11397677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
The large metrological variation (CV, about 25%) observed between laboratories, at the national French level, for the measurement of enzymatic activities results in a loss of efficiency in using laboratory results. Current data show that the standardisation of methods is insufficient to solve this problem and needs to be completed by an harmonisation of the practices including the use of a common reference (calibrator). The present work, carried out by the joint working group between laboratories of the Centres for Periodic Health Examination and the French Society of Clinical Biology (SFBC), deals mainly with the feasibility and evaluation of the improvement of the consistency of the results. Twenty laboratories participated in this study. Five independent surveys were conducted during an height month period. Two enzymes were selected because of their clinical importance and their interest in prevention, screening, diagnosis or epidemiology: ALT (alanine aminotransferase) and GGT (gamma-glutamyltransferase). In each survey three kinds of samples i.e. control sera, candidate calibrators and human serum pools, each of them at two levels of activity (one physiological and the other pathological) were measured in duplicate. The low intra-laboratory imprecision and the high degree of the standardisation of used methods, due to an important effort previously done in this field, permitted to consider a common calibration. The stability and mainly the commutability, i.e. the ability for the candidate calibrator to show a behaviour similar to that of human samples towards the used methods, allowed to reduce the inter-laboratory variation by a half to two third-fold, reaching a coefficient of variation < 5% similar to those observed for cholesterolemia or glycemia. This level of consistency should permit to use common reference limits and common decision limits, after validation of this approach in real practice. The consequences of the harmonisation of practices, extended to the all laboratories, exceed largely the scope of this study. The reduction of the uncertainty and a better approach of the accuracy for the measurement of enzymatic activities should led to a real benefit for the patients in terms of prevention, screening, diagnosis or therapeutic monitoring and consequently for the public health.
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Affiliation(s)
- F Schiele
- Laboratoire de biologie clinique, Centre de médecine préventive, 2, avenue du Doyen-Jacques-Parisot, 54500 VandOEuvre-lès-Nancy
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Férard G, Lessinger JM. [Clinical enzymology in the 2000s: moving towards greater effectiveness for the doctor and the patient]. Ann Biol Clin (Paris) 2000; 58:380-3. [PMID: 10846246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- G Férard
- Centre de traumatologie et d'orthopédie, 10, avenue Baumann, 67400 Illkirch cedex et Laboratoire de biochimie appliquée, Faculté de pharmacie, Université Louis-Pasteur, BP 24, 67401 Illkirch cedex
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39
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Abstract
Standardisation in clinical enzymology needs not only reference methods but also reference materials. While single-enzyme reference enzymes have been developed, a multienzyme certified reference material (MECRM) available in high amount remains to be produced. To transfer trueness from the value of the reference system to patients' results, validated enzyme calibrators (EC) are also needed. Both the MECRM and the ECs must exhibit the same catalytic properties as the corresponding enzymes in human plasma. Moreover, commutability of these materials with patients' samples must be experimentally tested for one or a set of methods defined by an analytical specificity equal to that of the reference method. Various experimental studies have shown that the commutability of an enzyme material depends on the source of enzyme and its purification process, the matrix (including cofactors, effectors, additives, stabilisers... ) and the mode of processing of the final material. To promote intermethod calibration in clinical enzymology, a collaborative programme between the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC), Institute for Reference Materials and Measurements (IRMM, Geel, Belgium) and IFCC corporate members is in progress for the development of a MECRM containing amylase, ALT, AST, ALP, CK, GGT, LDH, and lipase and exhibiting a wide and defined commutability.
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Affiliation(s)
- G Férard
- Laboratoire de Biochimie Appliquée, UFR des Sciences Pharmaceutiques, Université Louis Pasteur de Strasbourg, Illkirch, France
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Férard G, Edwards J, Kanno T, Lessinger JM, Moss DW, Schiele F, Tietz NW, Vassault A. Interassay calibration as a major contribution to the comparability of results in clinical enzymology. Clin Biochem 1998; 31:489-94. [PMID: 9740971 DOI: 10.1016/s0009-9120(98)00038-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
OBJECTIVE Factors contributing to the applicability of interassay calibration of methods measuring enzyme catalytic activities are described. Also discussed are the properties essential for such a material. Similarity of specificity for the methods to be calibrated as well as commutability between the material(s) intended to be used as calibrator are the main criteria to be satisfied. RESULT Several examples demonstrated that interassay calibration is feasible but a multi-enzyme calibrator with a wide commutability for the most popular methods remains to be developed. This is the project of the IFCC Working Group on Calibrators in Clinical Enzymology (WG-CCE). Several experimental data are also presented that indicate that the temperature at which the reaction is carried out is not a limiting factor in the implementation of interassay calibration in clinical enzymology.
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Affiliation(s)
- G Férard
- Laboratoire de Biochimie Appliquée, Faculté de Pharmacie, Université Louis Pasteur, Illkirch, France
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Férard G, Edwards J, Kanno T, Lessinger JM, Moss DW, Schiele F, Tietz NW, Vassault A. Validation of an enzyme calibrator--an IFCC guideline. International Federation of Clinical Chemistry. Clin Biochem 1998; 31:495-500. [PMID: 9740972 DOI: 10.1016/s0009-9120(98)00039-3] [Citation(s) in RCA: 12] [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: 11/30/2022]
Abstract
OBJECTIVES The objective of this guideline is to improve standardization in clinical enzymology in order to improve intermethod comparability of patients' results. DESIGN AND METHODS The reference system, combination of the reference method and the reference material, is used to produce a reference value for a given catalytic activity. Sets of methods are formed of methods exhibiting the same analytical specificity. Materials intended to be used as enzyme calibrators are experimentally checked for their commutability. RESULTS The transfer of accuracy from the reference value to patients' results is dependent on methods (analytical specificity) and on materials (experimentally assessed commutability). The feasibility of this approach was demonstrated with materials of high level for several enzymes and for each of them for several routine methods. CONCLUSION Expected advantages of this approach in clinical enzymology are presented.
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Affiliation(s)
- G Férard
- Laboratoire de Biochimie Appliquée, Faculté de Pharmacie, Université Louis Pasteur, Illkirch, France
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Lessinger JM, Férard G, Frei J, Grafmeyer D, Labbé D, Maire I, Mathieu M, Schiele F, Vassault A, Vialle A. [Daily practice in clinical enzymology: the danger of utilizing conversion factors tied to measured temperature]. Ann Biol Clin (Paris) 1998; 56:359-61. [PMID: 9754271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- J M Lessinger
- Laboratoire de biochimie appliquée, Université Louis-Pasteur de Strasbourg, Illkirch, France
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Dourson JL, Lessinger JM, Férard G. [A progress in the standardization in clinical enzymology using calibrators adapted to several techniques]. Ann Biol Clin (Paris) 1997; 55:229-34. [PMID: 9238425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Results in enzymology obtained in routine conditions, differ considerably according to the measurement procedures, and the use of conversion factors is not an advisable solution. Some studies show that between-laboratory agreement of results can be improved by using validated enzyme calibrators. The conditions, which are required to define a strategy for the development of such calibrators, are described in a first part. The example of lipase activity, which is measured in routine conditions with important between-method discrepancy, is studied in a second part. This example emphasised the need of an a priori control of the validity of the calibrators. Under these conditions, between-method agreement is in fact considerably improved. With the collaboration of manufacturers for the development of validated enzyme multicalibrators, it will be possible to improve the efficiency of the information transmitted by clinical chemists to clinicians. Thus, enzyme activities measurements could benefit from the same improvement as immunoassay of proteins with the use of CRM 470 by manufacturers to calibrate their standards.
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Affiliation(s)
- J L Dourson
- Laboratoire de biochimie appliquée, UFR des Sciences pharmaceutiques, Université Louis-Pasteur de Strasbourg, Illkirch, France
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Férard G, Lessinger JM. [Calibration and quality control]. Ann Biol Clin (Paris) 1997; 55:50-1. [PMID: 9099255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- G Férard
- Laboratoire de biochimie appliquée, Faculté de pharmacie, Illkirch
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Abstract
Abstract
Comparability of lipase catalytic activities was poor when lipase was determined in 50 patients' specimens by a turbidimetric (Boehringer) and a colorimetric (Sigma) assay. Mean values of results differed by a ratio of 2.39. Optimal common conditions were defined for the titration of lipase activity in two commercial calibrators and in a home-purified preparation of human pancreatic lipase (HPL). When using these titers for each calibrator, comparability was greatly improved (ratio = 1.25). This result indicates that a significant part of between-method discrepancy is due to the lack of a reference method for the titration of lipase calibrators. Intermethod behavior of each material was compared with that of patients' specimens. By using HPL as calibrator, comparability was still dramatically improved (ratio = 1.01). This study shows the importance of the validation of a material for defined routine measurement procedures, before its use as calibrator.
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Affiliation(s)
- J M Lessinger
- Laboratoire de Biochimie Appliquée, UFR des Sciences Pharmaceutiques, Université Louis Pasteur de Strasbourg, Illkirch, France
| | - J L Dourson
- Laboratoire de Biochimie Appliquée, UFR des Sciences Pharmaceutiques, Université Louis Pasteur de Strasbourg, Illkirch, France
| | - G Férard
- Laboratoire de Biochimie Appliquée, UFR des Sciences Pharmaceutiques, Université Louis Pasteur de Strasbourg, Illkirch, France
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Lessinger JM, Dourson JL, Férard G. Importance of standardization of lipase assays by using appropriate calibrators. Clin Chem 1996; 42:1979-83. [PMID: 8969636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Comparability of lipase catalytic activities was poor when lipase was determined in 50 patients' specimens by a turbidimetric (Boehringer) and a colorimetric (Sigma) assay. Mean values of results differed by a ratio of 2.39. Optimal common conditions were defined for the titration of lipase activity in two commercial calibrators and in a home-purified preparation of human pancreatic lipase (HPL). When using these titers for each calibrator, comparability was greatly improved (ratio = 1.25). This result indicates that a significant part of between-method discrepancy is due to the lack of a reference method for the titration of lipase calibrators. Intermethod behavior of each material was compared with that of patients' specimens. By using HPL as calibrator, comparability was still dramatically improved (ratio = 1.01). This study shows the importance of the validation of a material for defined routine measurement procedures, before its use as calibrator.
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Affiliation(s)
- J M Lessinger
- Laboratoire de Biochimie Appliquée, UFR des Sciences Pharmaceutiques, Université Louis Pasteur de Strasbourg, Illkirch, France
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Gubern G, Canalias F, Gella FJ, Colinet E, Profilis C, Calam DH, Ceriotti F, Dufaux J, Hadjivassiliou AG, Lessinger JM, Lorentz K, Vassault A. Production and certification of an enzyme reference material for pancreatic alpha-amylase (CRM 476). Clin Chim Acta 1996; 251:145-62. [PMID: 8862470 DOI: 10.1016/0009-8981(96)06302-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We describe the preparation of a lyophilized material containing purified human pancreatic alpha-amylase and the certification of its catalytic concentration. The enzyme was purified from human pancreas by ammonium sulphate precipitation and chromatography successively on DEAE-Sephacel, CM-Sepharose and Sephadex G-75. The purified enzyme had a specific activity of 52.9 kU/g protein and was > 99% pure on polyacrylamide gel electrophoresis. Only trace amounts of lipase and lactate dehydrogenase were detected in the purified fraction. The purified pancreatic alpha-amylase had a molar mass of 57,500 g/mol and an isoelectric point at 7.1. The material was prepared by diluting the purified alpha-amylase in a matrix containing PIPES buffer 25 mmol/l, pH 7.0, sodium chloride 50 mmol/l, calcium chloride 1.5 mmol/l, EDTA 0.5 mmol/l and human serum albumin 30 g/l, dispensing in ampoules and freeze-drying. The ampoules were homogeneous and the yearly loss of activity on the basis of accelerated degradation studies was less than 0.01% at -20 degrees C. The certified value for alpha-amylase catalytic concentration in the reconstituted reference material is 555 U/l +/- 11 U/l when measured by the specified method at 37 degrees C. The material can be used to verify the comparability of results from laboratories, for intra-laboratory quality control or for calibration of alpha-amylase catalytic concentration measurements.
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Affiliation(s)
- G Gubern
- Department de Bioquímica i Biologia Molecular, Universitat Autonòma de Barcelona, Spain
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Abstract
Catalytic properties of a preparation of human pancreatic lipase purified from pancreatic juice have been compared to those of the enzyme present in pooled plasma from patients suffering from acute pancreatitis. They were very similar as regards influence of effectors (sodium deoxycholate, colipase and Ca2+), optimal pH and apparent KM in optimized conditions. The stability of the preparation appeared to be satisfactory. It was found to be stable for at least 200 days in a liquid form at +4 degrees C and predictive degradation rates per year of the lyophilized form at +4 degrees C and -20 degrees C were 0.06% and 0.00%, respectively. The close similarity of properties of this preparation with those of a recombinant human pancreatic lipase produced in V79 Chinese hamster lung cells suggests that both approaches (purification from human pancreatic juice and gene transfer technology) could be used to produce a suitable reference material for this enzyme.
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Affiliation(s)
- J M Lessinger
- Laboratoire de Biochimie Appliquée, UFR des Sciences Pharmaceutiques, Universitè Louis Pasteur de Strasbourg, Illkirch, France
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Lessinger JM, Férard G, Grafmeyer D, Labbé D, Maire I, Schiele F, Vassault A. Usefulness of reference materials in calibration of enzyme activities. Eur J Clin Chem Clin Biochem 1995; 33:859-64. [PMID: 8620064 DOI: 10.1515/cclm.1995.33.11.859] [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] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
alpha-Amylase, alkaline phosphatase and gamma-glutamyltransferase were studied in a multicentre evaluation. Analyses were performed on different patient samples. Each enzyme was assayed in two different laboratories at both 30 and 37 degrees C, with widely used reagent kits and with the IFCC reference method (if in existence). Results differed considerably according to the measurement procedure. Data also showed that it was not possible to employ a constant conversion factor for one enzyme and different techniques between 30 and 37 degrees C. Calibration with three reference materials extensively improved the intermethod consistency for most of the tested measurement procedures. It was possible to transfer accuracy from the method used for the certification of the reference material to routine procedures, by using the reference material as calibrator. Temperature did not seem to be a crucial variable for the implement of the enzyme calibrator approach.
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Affiliation(s)
- J M Lessinger
- Laboratoire de Biochimie Appliquée et Laboratoire, Centre de Traumatologie et d'Orthopédie, Université Louis Pasteur de Strasbourg, Illkirch, France
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50
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Arzoglou P, Goudoula C, Tsantili P, Lessinger JM, Férard G, Mignot V, Samyn N, Demeester J, Lauwers A, Brettschneider H. Transferability of lipase titrimetric assays: deductions from an interlaboratory study. Eur J Clin Chem Clin Biochem 1994; 32:773-7. [PMID: 7865615 DOI: 10.1515/cclm.1994.32.10.773] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Following the selection of the most appropriate method for emulsification and the optimization of the reaction medium, interlaboratory studies were conducted to check the effect of preparing substrates and measuring the catalytic concentration of lipase at different sites as well as the effect of transport on emulsion. The determinations of lipase activity in an abnormal chemistry control against emulsions prepared by two laboratories (and used by both laboratories) and, also, against five separate emulsions prepared by one laboratory (and used by five different laboratories) resulted in average enzyme activity values (2234 +/- 125 and 2263 +/- 204 U/l respectively) which are not statistically different. Standard preparations of lipase, control sera and reference materials can therefore be titrated according to the procedure followed by at least two laboratories for at least 3 days against two separate emulsions.
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Affiliation(s)
- P Arzoglou
- Department of Chemistry, Aristotle University of Thessaloniki, Greece
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