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Delapierre B, Troussard X, Damaj G, Dejardin O, Tron L. Role of social status and social environment on net survival in patients with chronic lymphocytic leukemia: A high-resolution population-based study. Cancer Epidemiol 2023; 82:102292. [PMID: 36410088 DOI: 10.1016/j.canep.2022.102292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 11/02/2022] [Accepted: 11/05/2022] [Indexed: 11/19/2022]
Abstract
BACKGROUND The prognostic roles of social status and social environment in chronic lymphocytic leukemia have been highlighted in some solid tumors but remain unclear in hematological malignancies. The objective of this study was to evaluate the influence of individual social status (with socioprofessional category, SPC) and social environment (with European deprivation index, EDI) on net survival in a high-resolution population with CLL. METHODS We included CLL patients from the Regional Register of Hematological Malignancies in Normandy belonging to the French Network of Cancer Registries (Francim). The SPC variable was divided into 5 categories: farmers, craftsmen, higher employment, intermediate employment, and workers/employees. Net survival was used to estimate the excess of mortality in CLL independent of other possible causes of death using French life tables. Net survival was estimated with a nonparametric method (Pohar-Perme) and with a flexible excess mortality hazard model. Missing data were handled with multiple imputation. RESULTS A total of 780 patients were included. The median follow-up was 7.9 years. The crude survival at 10 years was 50%, and the net survival at 10 years was 80%. In multivariate analysis, a higher age (EHR: 1.04 [1.01-1.07]), being a craftsman (EHRcraftsmen/higher.employment: 4.15 [0.86-20.15]), being a worker or an employee (EHRworkers.employees/higher.employment: 3.57 [1.19-10.7]), having a Binet staging of B or C (EHR: 3.43 [1.84-6.42]) and having a lymphocyte count > 15 G/L (EHR: 3.80 [2.17-6.65]) were statistically associated with a higher risk of excess mortality. EDI was not associated with excess mortality (EHR: 0.97 [0.90-1.04]). CONCLUSION Socioprofessional category was a prognostic factor for an excess of mortality in CLL. Craftsmen and workers/employees shared a worse prognosis than workers with higher employment. The social environment was not a prognostic factor. Further work should be performed to explore causal epidemiologic or biological factors and other hematological malignancies.
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Affiliation(s)
- B Delapierre
- Department of Hematology, Institut d'hématologie de Basse-Normandie, University Hospital, Normandy University, School of Medicine, Caen, France; Department of Research, University Hospital, Caen, France; ANTICIPE U1086 Inserm-University of Caen, Centre François Baclesse, Caen, France.
| | - X Troussard
- Department of Research, University Hospital, Caen, France; Laboratory of Hematology, University Hospital, Caen, France; Registre Régional des Hémopathies malignes de Basse-Normandie, University Hospital of Caen, Caen, France
| | - G Damaj
- Department of Hematology, Institut d'hématologie de Basse-Normandie, University Hospital, Normandy University, School of Medicine, Caen, France; Department of Research, University Hospital, Caen, France
| | - O Dejardin
- Department of Research, University Hospital, Caen, France; ANTICIPE U1086 Inserm-University of Caen, Centre François Baclesse, Caen, France
| | - L Tron
- ANTICIPE U1086 Inserm-University of Caen, Centre François Baclesse, Caen, France
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Mezenge E, Pozuelos C, Bouguet G, Tron L, Joly F, Lange M. Plainte cognitive à l’issue des traitements d’un lymphome. PSYCHO-ONCOLOGIE 2021. [DOI: 10.3166/pson-2021-0144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Objectif : Évaluer la prévalence de la plainte cognitive chez des personnes ayant été traitées pour un lymphome.
Matériel et méthode : Questionnaire diffusé auprès des participants de la Journée mondiale des lymphomes, en septembre 2017 et février 2018.
Résultats : Soixante-deux pour cent des participants (n = 396) rapportaient une plainte cognitive, et 39 % l’attribuaient aux traitements oncologiques reçus. Cinquantequatre pour cent d’entre eux auraient souhaité bénéficier de soins de support adaptés.
Conclusion : Les difficultés cognitives à la suite des traitements oncologiques doivent être mieux connues des professionnels de santé afin de proposer des soins de support adaptés.
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Lange M, Joly F, Vardy J, Ahles T, Dubois M, Tron L, Winocur G, De Ruiter M, Castel H. Cancer-related cognitive impairment: an update on state of the art, detection, and management strategies in cancer survivors. Ann Oncol 2019; 30:1925-1940. [PMID: 31617564 PMCID: PMC8109411 DOI: 10.1093/annonc/mdz410] [Citation(s) in RCA: 255] [Impact Index Per Article: 51.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Advances in diagnostic and therapeutic strategies in oncology have significantly increased the chance of survival of cancer patients, even those with metastatic disease. However, cancer-related cognitive impairment (CRCI) is frequently reported in patients treated for non-central nervous system cancers, particularly during and after chemotherapy. DESIGN This review provides an update of the state of the art based on PubMed searches between 2012 and March 2019 on 'cognition', 'cancer', 'antineoplastic agents' or 'chemotherapy'. It includes the most recent clinical, imaging and pre-clinical data and reports management strategies of CRCI. RESULTS Evidence obtained primarily from studies on breast cancer patients highlight memory, processing speed, attention and executive functions as the most cognitive domains impaired post-chemotherapy. Recent investigations established that other cancer treatments, such as hormone therapies and targeted therapies, can also induce cognitive deficits. Knowledge regarding predisposing factors, biological markers or brain functions associated with CRCI has improved. Factors such as age and genetic polymorphisms of apolipoprotein E, catechol-O-methyltransferase and BDNF may predispose individuals to a higher risk of cognitive impairment. Poor performance on neuropsychological tests were associated with volume reduction in grey matter, less connectivity and activation after chemotherapy. In animals, hippocampus-based memory and executive functions, mediated by the frontal lobes, were shown to be particularly susceptible to the effects of chemotherapy. It involves altered neurogenesis, mitochondrial dysfunction or brain cytokine response. An important next step is to identify strategies for managing cognitive difficulties, with primary studies to assess cognitive training and physical exercise regimens. CONCLUSIONS CRCI is not limited to chemotherapy. A multidisciplinary approach has improved our knowledge of the complex mechanisms involved. Nowadays, studies evaluating cognitive rehabilitation programmes are encouraged to help patients cope with cognitive difficulties and improve quality of life during and after cancer.
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Affiliation(s)
- M. Lange
- INSERM, U1086, ANTICIPE, 14000 Caen,Clinical Research Department, Centre François Baclesse, 14000 Caen,Cancer and Cognition Platform, Ligue Nationale Contre le Cancer, 14000 Caen
| | - F. Joly
- INSERM, U1086, ANTICIPE, 14000 Caen,Clinical Research Department, Centre François Baclesse, 14000 Caen,Cancer and Cognition Platform, Ligue Nationale Contre le Cancer, 14000 Caen,Medical Oncology Department, CHU de Caen, 14000 Caen, France,Correspondence to: Prof. Florence Joly, Medical Oncology Department, Inserm U1086 Anticipe, Centre François Baclesse, 3 avenue Général Harris, Caen 14000, France. Tel: +33-2-3145-5002;
| | - J Vardy
- Concord Cancer Centre, Concord Repatriation General Hospital, Sydney, New South Wales,Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - T. Ahles
- Neurocognitive Research Lab, Memorial Sloan Kettering Cancer Center, New York, USA
| | - M. Dubois
- Cancer and Cognition Platform, Ligue Nationale Contre le Cancer, 14000 Caen,Normandie University, UNIROUEN, INSERM, DC2N, 76000 Rouen,Institute for Research and Innovation in Biomedicine (IRIB), 76000 Rouen
| | - L. Tron
- INSERM, U1086, ANTICIPE, 14000 Caen,Cancer and Cognition Platform, Ligue Nationale Contre le Cancer, 14000 Caen,CHU de Caen, 14000 Caen, France
| | - G. Winocur
- Baycrest Centre, Rotman Research Institute, Toronto,Department of Psychology, Trent University, Peterborough,Department of Psychology and Psychiatry, University of Toronto, Toronto, Canada
| | - M.B. De Ruiter
- Division of Psychosocial Research and Epidemiology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - H. Castel
- Cancer and Cognition Platform, Ligue Nationale Contre le Cancer, 14000 Caen,Normandie University, UNIROUEN, INSERM, DC2N, 76000 Rouen,Institute for Research and Innovation in Biomedicine (IRIB), 76000 Rouen
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Makinson A, Tron L, Grabar S, Milleron B, Reynes J, Le Moing V, Morquin D, Lert F, Costagliola D, Guiguet M. Potential lung cancer screening outcomes using different age and smoking thresholds in the ANRS-CO4 French Hospital Database on HIV cohort. HIV Med 2019; 21:180-188. [PMID: 31730270 DOI: 10.1111/hiv.12811] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/10/2019] [Indexed: 01/10/2023]
Abstract
OBJECTIVES In most lung screening programmes, only subjects ≥ 55 years old and smoking ≥ 30 pack-years are eligible to undergo chest low-dose computed tomography. Whether the same criteria should apply to people living with HIV (PLHIV) is uncertain, given the increased lung cancer risks associated with immunodeficiency and high rates of smoking. We assessed different outcomes obtained from simulating one round of lung cancer screening in PLHIV using different age and smoking thresholds for eligibility. METHODS Data from the French Agence Nationale de Recherche sur le SIDA et les Hépatites Virales (ANRS)-CO4 French Hospital Database on HIV (FHDH) cohort of PLHIV and a national representative survey of PLHIV in care in 2011 (the ANRS-VESPA2 [enquête sur les personnes atteintes] study) were used to estimate the maximum proportion of incident lung cancers occurring between 2012 and 2016 that would have potentially been detected by screening in 2011. Secondary outcomes were numbers of eligible subjects in the cohort and numbers of subjects needed to screen (NNS) to detect one lung cancer. RESULTS Among 77819 PLHIV in 2011 (median age 46 years; 66% men), 285 subjects subsequently developed lung cancer. Adoption of the US Preventive Services Task Force (USPSTF) recommendations (55-80 years; ≥ 30 pack-years) would have detected 31% of lung cancers at most. Lowering the minimum age to 50 and 45 years would have detected 49% and 60% of cancers, respectively, but would have greatly increased the number of eligible subjects and the NNS to detect one case of lung cancer. CONCLUSIONS Use of the USPSTF criteria would have detected only a minority of lung cancers in a large French cohort of PLHIV in 2011. Screening PLHIV at younger ages (45 or 50 years) and/or the use of lower smoking thresholds (20 pack-years) may be beneficial, despite the consequently higher numbers of eligible subjects and NNS to detect one case of lung cancer, and should be evaluated in future studies.
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Affiliation(s)
- A Makinson
- Infectious and Tropical Diseases Department, UMI 233/INSERM U1175, Montpellier University Hospital, Montpellier, France
| | - L Tron
- University Hospital of Caen, Caen, France.,ANTICIPE' U1086 INSERM-UCN, François Baclesse Center, Caen, France
| | - S Grabar
- INSERM, Institute of Epidemiology and Public Health Pierre Louis (IPLESP), Sorbonne Université, Paris, France.,Biostatistic and Epidemiology Unit, Cochin Hospital, Paris, France.,Paris-Descartes University, Paris, France
| | - B Milleron
- French Cooperative Thoracic Intergroup (IFCT), Paris, France.,Public Hospitals of Paris (APHP), University Hospitals of Bichat and Tenon, Paris, France
| | - J Reynes
- Infectious and Tropical Diseases Department, UMI 233/INSERM U1175, Montpellier University Hospital, Montpellier, France
| | - V Le Moing
- Infectious and Tropical Diseases Department, UMI 233/INSERM U1175, Montpellier University Hospital, Montpellier, France
| | - D Morquin
- Infectious and Tropical Diseases Department, UMI 233/INSERM U1175, Montpellier University Hospital, Montpellier, France
| | - F Lert
- Department of Epidemiology of Occupational and Social Determinants of Health, Center for Research in Epidemiology and Population Health, INSERM, Villejuif, France
| | - D Costagliola
- INSERM, Institute of Epidemiology and Public Health Pierre Louis (IPLESP), Sorbonne Université, Paris, France
| | - M Guiguet
- INSERM, Institute of Epidemiology and Public Health Pierre Louis (IPLESP), Sorbonne Université, Paris, France
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Fauvernier M, Roche L, Uhry Z, Tron L, Bossard N, Remontet L. Splines multidimensionnelles pénalisées dans les modèles de survie : applications en épidémiologie des cancers. Rev Epidemiol Sante Publique 2019. [DOI: 10.1016/j.respe.2019.03.111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Feuillet P, Lert F, Tron L, Aubriere C, Spire B, Dray-Spira R. Prevalence of and factors associated with depression among people living with HIV in France. HIV Med 2016; 18:383-394. [PMID: 27625202 DOI: 10.1111/hiv.12438] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/02/2016] [Indexed: 12/01/2022]
Abstract
OBJECTIVES Depression is common among people living with HIV (PLWHIV) and is associated with poorer therapeutic outcomes and risky behaviours. We sought to estimate the prevalence of major depressive episode (MDE) across PLWHIV groups, to compare this with its prevalence in the general population and to assess factors associated with it. METHODS We used data from the Agence Nationale de Recherche sur le Sida et les Hépatites Virales (ANRS)-Vespa2 study, a national study on a representative sample of PLWHIV conducted in France in 2011. The short form of the depression module of the World Health Organization's Composite International Diagnostic Instrument (CIDI-SF) was used to characterize the occurrence of an MDE during the previous year. MDE prevalence was assessed among the various groups of PLWHIV and compared with that in the general population, accounting for the sociodemographic characteristics of the two populations, using multivariate Poisson regression models. The same method was used to assess associated factors. RESULTS MDE prevalence was 28.1% among PLWHIV, ranging from 10.9 to 55.7% across groups. Compared with the general population by sex, regardless of sexual orientation and origin, MDE prevalence was 5.1-fold higher in HIV-infected men who have sex with men [95% confidence interval (CI) 3.9-6.6], 3.1-fold higher in non-sub-Saharan African (SSA) heterosexual men (95% CI 2.2-4.4), 1.6-fold higher in SSA migrant men (95% CI 0.9-2.6), 2.6-fold higher in non-SSA heterosexual women (95% CI 2.1-3.3), and 1.9-fold higher in SSA migrant women (95% CI 1.5-2.5). In the HIV-infected population, MDE was positively related to unemployment, material deprivation, disclosure, experience of discrimination, and untreated hepatitis C, and negatively related to age. CONCLUSIONS The prevalence of depression varied across the different groups of PLWHIV, with levels much higher than in the general population. Moreover, there was a strong association with socioeconomic status and HIV experience.
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Affiliation(s)
- P Feuillet
- Department of Social Epidemiology, INSERM UMR_S 1136, Pierre Louis Institute of Epidemiology and Public Health, Sorbonne Universités, UPMC University of Paris 06, Paris, France
| | - F Lert
- Department of Epidemiology of Occupational and Social Determinants of Health, Center for Research in Epidemiology and Public Health, U1018, INSERM, Villejuif, France
| | - L Tron
- Department of Social Epidemiology, INSERM UMR_S 1136, Pierre Louis Institute of Epidemiology and Public Health, Sorbonne Universités, UPMC University of Paris 06, Paris, France
| | - C Aubriere
- Department of Social Epidemiology, INSERM UMR_S 1136, Pierre Louis Institute of Epidemiology and Public Health, Sorbonne Universités, UPMC University of Paris 06, Paris, France
| | - B Spire
- Economics and Social Sciences Applied to Health and Analysis of Medical Information (SESSTIM), UMR912, INSERM, Marseille, France.,UMRS912, IRD, Aix Marseille University, Marseille, France.,Southeastern Health Regional Observatory, ORS PACA, Marseille, France
| | - R Dray-Spira
- Department of Social Epidemiology, INSERM UMR_S 1136, Pierre Louis Institute of Epidemiology and Public Health, Sorbonne Universités, UPMC University of Paris 06, Paris, France
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Tron L, Lert F, Spire B, Dray-Spira R. Levels and determinants of breast and cervical cancer screening uptake in HIV-infected women compared with the general population in France. HIV Med 2016; 18:181-195. [PMID: 28967199 DOI: 10.1111/hiv.12412] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/30/2016] [Indexed: 12/26/2022]
Abstract
OBJECTIVES Cancer is a growing concern for HIV-infected people, and screening plays a major role in alleviating the burden it causes. We sought to investigate the levels and determinants of breast cancer screening (BCS) and cervical cancer screening (CCS) in HIV-infected women as compared with the general population. METHODS The Agence Nationale de Recherche sur le Sida et les Hépatites Virales (ANRS)-Vespa2 study was conducted in 2011 in a national representative sample of 3022 HIV-infected hospital out-patients in France. The rates and correlates of BCS and CCS among HIV-infected women were compared with those in the general population using multivariate Poisson regression models. RESULTS The BCS rate during the 2 years preceding the survey interview was 80.7% among HIV-infected women vs. 89.1% in the general population (P = 0.146). The CCS rate during the preceding 3 years was 88.1% among HIV-infected women vs. 83.1% in the general population (P = 0.021). During the preceding year, the CCS rate among HIV-infected women was 76.5%. The barriers to BCS and CCS were a low educational level [BCS: adjusted prevalence rate ratio 0.88; 95% confidence interval (CI) 0.80-0.97; CCS: adjusted prevalence rate ratio 0.91; 95% CI 0.83-0.99], not having supplementary health insurance (CCS: adjusted prevalence rate ratio 0.92; 95% CI 0.86-0.98), an irregular gynaecological follow-up (BCS: adjusted prevalence rate ratio 0.77; 95% CI 0.64-0.92; CCS: adjusted prevalence rate ratio 0.72; 95% CI 0.64-0.81) and a low CD4 count (BCS: adjusted prevalence rate ratio 0.83; 95% CI 0.71-0.97; CCS: adjusted prevalence rate ratio 0.78; 95% CI 0.63-0.98). The disparities in CCS uptake in terms of age, employment and gynaecological follow-up were less pronounced among HIV-infected women than in the general population. CONCLUSIONS BCS and CCS uptake was not lower among HIV-infected women than in the general population, but CCS was suboptimal. Specificities in the profile of barriers to screening emerged.
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Affiliation(s)
- L Tron
- Department of social epidemiology, Institut Pierre Louis d'Epidémiologie et de Santé Publique (IPLESP UMRS1136), UPMC Univ Paris 06, Sorbonne University, INSERM, Paris, France
| | - F Lert
- Department of Epidemiology of Occupational and Social Determinants of Health, Center for Research in Epidemiology and Population Health, INSERM, U1018, Villejuif, France
| | - B Spire
- Economics and Social Sciences Applied to Health and Analysis of Medical Information (SESSTIM), INSERM, UMR912, Marseille, France.,Aix-Marseille University, UMRS912, IRD, Marseille, France.,Southeastern Health Regional Observatory, ORS PACA, Marseille, France
| | - R Dray-Spira
- Department of social epidemiology, Institut Pierre Louis d'Epidémiologie et de Santé Publique (IPLESP UMRS1136), UPMC Univ Paris 06, Sorbonne University, INSERM, Paris, France
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Tron L, Aubrière C, Lert F, Spire B, Dray-Spira R. Dépistage des cancers du sein et du col de l’utérus chez les femmes séropositives. Rev Epidemiol Sante Publique 2013. [DOI: 10.1016/j.respe.2013.07.251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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9
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Molnar Z, Simon Z, Borbenyi Z, Deak B, Galuska L, Keresztes K, Miltenyi Z, Marton I, Rosta A, Schneider T, Tron L, Varady E, Illes A. Prognostic value of FDG-PET in Hodgkin lymphoma for posttreatment evaluation. Long term follow-up results. Neoplasma 2010; 57:349-354. [PMID: 20429626] [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: 05/29/2023]
Abstract
Determining the viability of residual tumor masses is a great challenge after primary treatment of Hodgkin lymphoma. FDG-PET may play a crucial role in this procedure. In this study, files of 128 Hodgkin lymphoma patients were reviewed, who were treated in three Hungarian hematology centers between January 1995 and February 2005. CT scan showed residual tumor mass by all of them. Their median follow-up was 75.5 months from PET examination. The number of true-positive, true-negative, false-positive, false-negative subjects were 29, 83, 10, 6, respectively. Sensitivity of post-treatment FDG-PET was 83 %, specificity 93 %, positive predictive value 74 %, negative predictive value 93 %, and accuracy 88 %. The difference between the event free survival of PET positive and negative cases is highly significant (p=0.0000), according to the Mantel-Cox test. Our results in the largest cohort of patients, in accordance with literature, clearly indicates that patients with negative FDG-PET results are unlikely to progress or relapse during the longest follow-up.
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Affiliation(s)
- Z Molnar
- National Institute of Oncology, Budapest, Hungary.
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Glaub T, Berecz R, Emri M, Fekeshazy A, Miklovitz T, Bartok E, Degrell I, Tron L. Auditory event-related potential and PET. Eur Psychiatry 2002. [DOI: 10.1016/s0924-9338(02)80508-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Emri M, Glaub T, Berecz R, Lengyel Z, Mikecz P, Bartok E, Tron L, Degrell I. Auditory event-related potential and PET: functional correlations. Eur Psychiatry 2002. [DOI: 10.1016/s0924-9338(02)80507-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Krasznai Z, Marian T, Izumi H, Damjanovich S, Balkay L, Tron L, Morisawa M. Membrane hyperpolarization removes inactivation of Ca2+ channels, leading to Ca2+ influx and subsequent initiation of sperm motility in the common carp. Proc Natl Acad Sci U S A 2000; 97:2052-7. [PMID: 10688893 PMCID: PMC15752 DOI: 10.1073/pnas.040558097] [Citation(s) in RCA: 134] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/1999] [Accepted: 12/20/1999] [Indexed: 11/18/2022] Open
Abstract
Change of osmolality surrounding spawned sperm from isotonic to hypotonic causes the initiation of sperm motility in the common carp. Here we show that membrane-permeable cAMP does not initiate motility of carp sperm that is quiescent in isotonic solution, and that motility of the demembranated sperm can be reactivated without cAMP. Furthermore, the cAMP level does not change during the initiation of sperm motility, and inhibitors of protein kinase do not affect sperm motility, suggesting that no cAMP-dependent system is necessary for the regulation of sperm motility. Sperm motility could not be initiated in Ca(2+)-free hypoosmotic solutions, and significant increase in the intracellular Ca(2+) level was observed by a Ca-sensitive fluorescence dye during hypoosmolality-induced active motion period. The demembranated sperm cells were fully reactivated in the solutions containing 10(-7) to 10(-5) M Ca(2+). Ca(2+) channel blockers such as verapamil and omega-conotoxin reversibly inhibited the initiation of sperm motility, suggesting that Ca(2+) influx is the prerequisite for the initiation of carp sperm motility. Motility of intact sperm was completely blocked; however, that of the demembranated sperm was not inhibited by the calmodulin inhibitor W7, suggesting that the calmodulin bound close to the plasma membrane participated in the initiation of sperm motility. Flow cytometric membrane potential measurements and spectrophotometric measurements by using fluorescence dyes showed transient membrane hyperpolarization on hypoosmolality-induced motility. This article discusses the role of membrane hyperpolarization on removal of inactivation of Ca(2+) channels, leading to Ca(2+) influx at the initiation of carp sperm motility.
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Affiliation(s)
- Z Krasznai
- Department of Biophysics, and Positron Emission Tomography Center, Medical and Health Science Center, University of Debrecen, H-4012 Debrecen, Hungary.
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Aszalos A, Tron L, Siegel JP, Johnson A. Cyclosporin A modulates K+ fluxes across the plasma membrane of resting lymphocytes without affecting the intracellular pH and [Ca2+]. J Chemother 1989; 1:452-3. [PMID: 16312481] [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: 05/05/2023]
Affiliation(s)
- A Aszalos
- Division of Research and Testing, Food and Drug Administration, Washington, D.C. 20204, USA
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14
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Tron L, Siegel JP, Aszalos A. Effect of cyclosporin A and ionophores on the intracellular pH of lymphocytes as measured by flow cytometry. Biochem Med Metab Biol 1989; 41:164-70. [PMID: 2497757 DOI: 10.1016/0885-4505(89)90022-4] [Citation(s) in RCA: 6] [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] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Because of the known importance of pHi changes on the biology of cells, we have investigated the effect of CsA, the clinically important immunomodulator, on the pHi of resting mouse spleen and human peripheral blood lymphocytes. We have found that pharmacological doses (0.8 microM) of CsA caused no change in the pHi in these cells. Similarly, the Ca2+ ionophore, A23187, up to 5 microns concentration, had no effect on the pHi of these cells, in contrast to previous reports. However, higher doses of CsA (2.4-8.0 microM) did change the pHi transiently or permanently. These results were obtained with flow cytometric measurements of fluorescence intensity of the pH-sensitive dye, BCECF.
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Affiliation(s)
- L Tron
- Division of Research and Testing, Food and Drug Administration, Washington, DC 20204
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Aszalos A, Tron L, Paxton H, Shen S. Lymphocyte subpopulation with low membrane potential in the blood of cyclosporin- and prednisone-treated patients: in vivo selectivity for T4 subset. Biochem Med Metab Biol 1989; 41:25-9. [PMID: 2565726 DOI: 10.1016/0885-4505(89)90004-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Previous work on the mode of action of CsA revealed that this drug shifts the membrane potential of human periferal blood lymphocytes in vitro. Recently we have analyzed lymphocytes of cyclosporin-treated transplant patients. Membrane potential analysis with the DIOC6(3) fluorescence dye indicates that all the studied patients have a subpopulation of lymphocytes with low membrane potential and that this population is made up predominently of OKT4+ cells. However there is no correlation between the clinical events and the percentage distribution of lymphocyte subpopulations as defined by the membrane potential and the T4/T8 ratio of the total lymphocyte population.
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Affiliation(s)
- A Aszalos
- Division of Drug Biology, Food and Drug Administration, Washington, D.C. 20204
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Szollosi J, Brodsky F, Balazs M, Nagy P, Tron L, Fulwyler M, Damjanovich S. Physical association between HLA class I and class II molecules detected on the cell surface by flow cytometric energy transfer. Hum Immunol 1988. [DOI: 10.1016/0198-8859(88)90270-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
The reaction of rabbit muscle phosphorylase b with 5,5'-dithiobis(2-nitrobenzoic acid) (Nbs2) has been studied with stopped-flow spectrophotometry. Two highly reactive sulfhydryl groups per dimer reacted with Nbs2 within a few seconds, while the remaining SH groups needed several minutes and hours. Decomposition of the time curve revealed that the highly reactive SH groups can be divided into two subclasses: a fast type which reacted with a rate constant of 3 x 10-3 M-1 sec-1 and a more slowly reacting type disappearing with a rate constant of 0.3 x 10-3 M-1 sec-1. The reactivity of the slowly reacting type increased by a factor of about 2 in the presence of 1 mM AMP. Concurrently, the ratio between the fast reacting and the more slowly reacting subclasses decreased from 5.3 to 1.0. The AMP effect was greatly enhanced by glucose 1-phosphate. This enhancement was abolished in the presence of ATP. The finding that the ratio between the number of SH groups in the two subclasses of the highly reactive SH groups changed upon addition of ligand molecules indicates that the two subclasses reflect the different reactivities of the SH groups when the enzyme is present in different conformational states. It is suggested that the highly reactive SH group measured belong to the peptide: Gly-Cys-Arg-Asp.
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