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Pelletier R, Danylchuk DI, Benaissa H, Broch F, Vauchelles R, Gautier A, Klymchenko AS. Genetic Targeting of Solvatochromic Dyes for Probing Nanoscale Environments of Proteins in Organelles. Anal Chem 2023. [PMID: 37229557 DOI: 10.1021/acs.analchem.3c00515] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A variety of protein tags are available for genetically encoded protein labeling, which allow their precise localization and tracking inside the cells. A new dimension in protein imaging can be offered by combining protein tags with polarity-sensitive fluorescent probes, which provide information about local nanoscale environments of target proteins within the subcellular compartments (organelles). Here, we designed three fluorescent probes based on solvatochromic nile red dye, conjugated to a HaloTag reactive targeting group through polyethylene glycol linkers of varying lengths. The probe with medium linker length, NR12-Halo, was found to label specifically a large variety of proteins localized in defined cell compartments, such as plasma membranes (outer and inner leaflets), endoplasmic reticulum, Golgi apparatus, cytosol, microtubules, actin, and chromatin. Owing to its polarity-sensitive fluorophore, the probe clearly distinguished the proteins localized within apolar lipid membranes from other proteins. Moreover, it revealed dramatic changes in the environment during the life cycle of proteins from biosynthesis to their expected localization and, finally, to recycling inside lysosomes. Heterogeneity in the local polarity of some membrane proteins also suggested a formation of low-polar protein aggregates, for example, within cell-cell contacts. The approach also showed that mechanical stress (cell shrinking by osmotic shock) induced a general polarity decrease in membrane proteins, probably due to the condensation of biomolecules. Finally, the nanoenvironment of some membrane proteins was affected by a polyunsaturated fatty acid diet, which provided the bridge between organization of lipids and proteins. The developed solvatochromic HaloTag probe constitutes a promising tool for probing nanoscale environments of proteins and their interactions within subcellular structures.
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Affiliation(s)
- Rémi Pelletier
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, Strasbourg, Illkirch 67401, France
| | - Dmytro I Danylchuk
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, Strasbourg, Illkirch 67401, France
| | - Hela Benaissa
- CNRS, Laboratoire des Biomolécules, LBM, Sorbonne Université, École Normale Supérieure, Université PSL, Paris 75005 France
| | - Fanny Broch
- CNRS, Laboratoire des Biomolécules, LBM, Sorbonne Université, École Normale Supérieure, Université PSL, Paris 75005 France
| | - Romain Vauchelles
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, Strasbourg, Illkirch 67401, France
| | - Arnaud Gautier
- CNRS, Laboratoire des Biomolécules, LBM, Sorbonne Université, École Normale Supérieure, Université PSL, Paris 75005 France
| | - Andrey S Klymchenko
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, Strasbourg, Illkirch 67401, France
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2
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Corso B, Bacle A, Demay E, Mercerolle M, Pelletier R, Gicquel T, Le Daré B. Place of therapeutic cannabis in France and safety data: A literature review. Ann Pharm Fr 2023:S0003-4509(23)00021-4. [PMID: 36841395 DOI: 10.1016/j.pharma.2023.02.002] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/21/2023] [Accepted: 02/22/2023] [Indexed: 02/27/2023]
Abstract
OBJECTIVES To date, very few cannabis-based specialities are authorised on the French market despite a growing demand from patients and health professionals. The objective of this study is to review the tolerance profile and the French legislative status of the two main cannabinoids used for therapeutic purposes: tetrahydrocannabiol (THC) associated with psychoactive effects and non-psychoactive cannabidiol (CBD). METHODS This review is based on relevant articles retrieved by a search in Google Scholar and PubMed databases and on an assessment of the legal texts and summaries of product characteristics available in France. RESULTS Evidence for the tolerability of CBD during chronic use is reassuring, but a significant risk of drug interactions exists. THC use appears to be associated with a higher proportion of serious adverse effects, including neuropsychological and cardiovascular effects. Inhaled cannabis appears to be associated with greater toxicity than the oral route. These data are presented together with the pharmacokinetic and pharmacodynamic data of THC and CBD. CONCLUSION The literature reports several frequent but rarely serious adverse effects of CBD during chronic use as well as a significant risk of drug interactions. THC use seems to be associated with a higher proportion of serious adverse effects compared to CBD, particularly at the neuropsychological and cardiovascular levels. Health professionals should be up to date on the particularities of therapeutic cannabis in terms of efficacy, safety and drug interactions.
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Affiliation(s)
- B Corso
- Université de Rennes 1, 35000 Rennes, France
| | - A Bacle
- Service pharmacie, centre hospitalier universitaire de Rennes, 35000 Rennes, France
| | - E Demay
- Service pharmacie, centre hospitalier universitaire de Rennes, 35000 Rennes, France
| | - M Mercerolle
- Service pharmacie, centre hospitalier universitaire de Rennes, 35000 Rennes, France
| | - R Pelletier
- Centre hospitalier universitaire de Rennes, laboratoire de toxicologie biologique et médico-légale, biochimie-toxicologie, 35000 Rennes, France; Université Rennes, Inserm, INRAE, CHU de Rennes, Institut NuMeCan (Nutrition, Métabolismes et Cancer), Réseau PREVITOX, 35000 Rennes, France
| | - T Gicquel
- Centre hospitalier universitaire de Rennes, laboratoire de toxicologie biologique et médico-légale, biochimie-toxicologie, 35000 Rennes, France; Université Rennes, Inserm, INRAE, CHU de Rennes, Institut NuMeCan (Nutrition, Métabolismes et Cancer), Réseau PREVITOX, 35000 Rennes, France
| | - B Le Daré
- Service pharmacie, centre hospitalier universitaire de Rennes, 35000 Rennes, France; Université Rennes, Inserm, INRAE, CHU de Rennes, Institut NuMeCan (Nutrition, Métabolismes et Cancer), Réseau PREVITOX, 35000 Rennes, France.
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Aparin IO, Yan R, Pelletier R, Choi AA, Danylchuk DI, Xu K, Klymchenko AS. Fluorogenic Dimers as Bright Switchable Probes for Enhanced Super-Resolution Imaging of Cell Membranes. J Am Chem Soc 2022; 144:18043-18053. [PMID: 36153973 DOI: 10.1021/jacs.2c07542] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Super-resolution fluorescence imaging based on single-molecule localization microscopy (SMLM) enables visualizing cellular structures with nanometric precision. However, its spatial and temporal resolution largely relies on the brightness of ON/OFF switchable fluorescent dyes. Moreover, in cell plasma membranes, the single-molecule localization is hampered by the fast lateral diffusion of membrane probes. Here, to address these two fundamental problems, we propose a concept of ON/OFF switchable probes for SMLM (points accumulation for imaging in nanoscale topography, PAINT) based on fluorogenic dimers of bright cyanine dyes. In these probes, the two cyanine units connected with a linker were modified at their extremities with low-affinity membrane anchors. Being self-quenched in water due to intramolecular dye H-aggregation, they displayed light up on reversible binding to lipid membranes. The charged group in the linker further decreased the probe affinity to the lipid membranes, thus accelerating its dynamic reversible ON/OFF switching. The concept was validated on cyanines 3 and 5. SMLM of live cells revealed that the new probes provided higher brightness and ∼10-fold slower diffusion at the cell surface, compared to reference probes Nile Red and DiD, which boosted axial localization precision >3-fold down to 31 nm. The new probe allowed unprecedented observation of nanoscale fibrous protrusions on plasma membranes of live cells with 40 s time resolution, revealing their fast dynamics. Thus, going beyond the brightness limit of single switchable dyes by cooperative dequenching in fluorogenic dimers and slowing down probe diffusion in biomembranes open the route to significant enhancement of super-resolution fluorescence microscopy of live cells.
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Affiliation(s)
- Ilya O Aparin
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, 67401 Illkirch, France
| | - Rui Yan
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.,Chan Zuckerberg Biohub, San Francisco, California 94158, United States
| | - Rémi Pelletier
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, 67401 Illkirch, France
| | - Alexander A Choi
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.,Chan Zuckerberg Biohub, San Francisco, California 94158, United States
| | - Dmytro I Danylchuk
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, 67401 Illkirch, France
| | - Ke Xu
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.,Chan Zuckerberg Biohub, San Francisco, California 94158, United States
| | - Andrey S Klymchenko
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, 67401 Illkirch, France
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Pelletier R, Saintobert C, Kuhnast B, Specklin S. New phase transfer agents for fluorine 18 radiolabelling. Nucl Med Biol 2022. [DOI: 10.1016/s0969-8051(22)00079-8] [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: 10/18/2022]
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Fam KT, Pelletier R, Bouhedda F, Ryckelynck M, Collot M, Klymchenko AS. Rational Design of Self-Quenched Rhodamine Dimers as Fluorogenic Aptamer Probes for Live-Cell RNA Imaging. Anal Chem 2022; 94:6657-6664. [PMID: 35486532 DOI: 10.1021/acs.analchem.1c04556] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
With the growing interest in the understanding of the importance of RNAs in health and disease, detection of RNAs in living cells is of high importance. Fluorogenic dyes that light up specifically selected RNA aptamers constitute an attractive direction in the design of RNA imaging probes. In this work, based on our recently proposed concept of a fluorogenic dimer, we aim to develop a robust molecular tool for intracellular RNA imaging. We rationally designed a fluorogenic self-quenched dimer (orange Gemini, o-Gemini) based on rhodamine and evaluated its capacity to light up its cognate aptamer o-Coral in solution and live cells. We found that the removal of biotin from the dimer slightly improved the fluorogenic response without losing the affinity to the cognate aptamer (o-Coral). On the other hand, replacing sulforhodamine with a carboxyrhodamine produced drastic improvement of the affinity and the turn-on response to o-Coral and, thus, a better limit of detection. In live cells expressing o-Coral-tagged RNAs, the carboxyrhodamine analogue of o-Gemini without a biotin unit displayed a higher signal as well as faster internalization into the cells. We suppose that less hydrophilic carboxyrhodamine compared to sulforhodamine can more readily penetrate through the cell plasma membrane and, together with its higher affinity to o-Coral, provide the observed improvement in the imaging experiments. The promiscuity of the o-Coral RNA aptamer to the fluorogenic dimer allowed us to tune a fluorogen chemical structure and thus drastically improve the fluorescence response of the probe to o-Coral-tagged RNAs.
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Affiliation(s)
- Kyong Tkhe Fam
- Laboratoire de Bioimagerie et Pathologies, CNRS UMR 7021, Université de Strasbourg, 67401 Illkirch, France
| | - Rémi Pelletier
- Laboratoire de Bioimagerie et Pathologies, CNRS UMR 7021, Université de Strasbourg, 67401 Illkirch, France
| | - Farah Bouhedda
- CNRS, Architecture et Réactivité de l'ARN, UPR 9002, Université de Strasbourg, F-67000 Strasbourg, France
| | - Michael Ryckelynck
- CNRS, Architecture et Réactivité de l'ARN, UPR 9002, Université de Strasbourg, F-67000 Strasbourg, France
| | - Mayeul Collot
- Laboratoire de Bioimagerie et Pathologies, CNRS UMR 7021, Université de Strasbourg, 67401 Illkirch, France
| | - Andrey S Klymchenko
- Laboratoire de Bioimagerie et Pathologies, CNRS UMR 7021, Université de Strasbourg, 67401 Illkirch, France
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Pelletier R, Le Daré B, Grandin L, Couëtte A, Ferron P, Morel I, Gicquel T. Un cas clinique d’intoxication aux Nouveaux produits de synthèse (NPS) nécessitant une hospitalisation en réanimation élucidée grâce au réseau moléculaire. Toxicologie Analytique et Clinique 2021. [DOI: 10.1016/j.toxac.2021.08.012] [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: 11/16/2022]
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Bouraguba M, Glattard E, Naudé M, Pelletier R, Aisenbrey C, Bechinger B, Raibaut L, Lebrun V, Faller P. Copper-binding motifs Xxx-His or Xxx-Zzz-His (ATCUN) linked to an antimicrobial peptide: Cu-binding, antimicrobial activity and ROS production. J Inorg Biochem 2020; 213:111255. [DOI: 10.1016/j.jinorgbio.2020.111255] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 08/28/2020] [Accepted: 09/06/2020] [Indexed: 02/07/2023]
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Pelletier R, Purcell-Levesque L, Girard MC, Roy PM, Leonard G. Pain Intensity and Functional Outcomes for Activities of Daily Living, Gait and Balance in Older Adults Accessing Outpatient Rehabilitation Services: A Retrospective Study. J Pain Res 2020; 13:2013-2021. [PMID: 32821153 PMCID: PMC7423354 DOI: 10.2147/jpr.s256700] [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: 04/03/2020] [Accepted: 06/17/2020] [Indexed: 12/05/2022] Open
Abstract
Purpose Older adults are referred for outpatient physical therapy to improve their functional capacities. The goal of the present study was to determine if pain had an influence on functional outcomes in older adults who took part in an outpatient physical rehabilitation program. Patients and Methods A retrospective study was performed on the medical records of patients aged 65 and over referred for outpatient physical therapy to improve physical functioning (n=178). Pain intensity (11-point numeric pain scale) and results from functional outcome measures (Timed Up and Go [TUG], Berg Balance Scale [BBS], 10-meter walk test, 6-minute walk test and Functional Autonomy Measuring System [SMAF]) were extracted at initial (T1) and final (T2) consultations. Paired t-tests were performed to determine if there were differences in functional outcome measures between T1 and T2 in all the patients. Patients were stratified to those with pain (PAIN, n=136) and those without pain (NO PAIN, n=42). Differences in functional outcome measures between T1 and T2 (delta scores) were compared between groups with independent t-tests with Welch corrections for unequal variances. Pearson correlation coefficients between initial pain intensity and changes in functional outcome measures (T2-T1) were also performed. Correcting for multiple comparisons, a p-value of p≤0.01 was considered as statistically significant. Results The TUG, BBS, 10-meter walk test, 6-minute walk test all demonstrated improvement between T1 and T2 (all p<0.01). There was no difference between groups for delta scores for TUG (p=0.14), BBS (p=0.03), 10-meter walk test (p=0.54), 6-minute walk test (p=0.94) and SMAF (p=0.23). Pearson correlation coefficients were weak between initial pain intensity and changes in functional outcome scores between T1 and T2 (r= −0.16 to 0.15, all p-values >0.10). Conclusion These results suggest that pain is not an impediment to functional improvements in older individuals who participated in an outpatient physical rehabilitation program.
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Affiliation(s)
- R Pelletier
- School of Rehabilitation, Faculty of Medicine, Université de Montréal, Montreal, Quebec, Canada
| | - L Purcell-Levesque
- Research Center on Aging, Centre intégré universitaire de santé et de services sociaux de l'Estrie - Centre hospitalier universitaire de Sherbrooke (CIUSSS de l'Estrie - CHUS), Sherbrooke, Quebec, Canada
| | - M-C Girard
- Research Center on Aging, Centre intégré universitaire de santé et de services sociaux de l'Estrie - Centre hospitalier universitaire de Sherbrooke (CIUSSS de l'Estrie - CHUS), Sherbrooke, Quebec, Canada
| | - P-M Roy
- Research Center on Aging, Centre intégré universitaire de santé et de services sociaux de l'Estrie - Centre hospitalier universitaire de Sherbrooke (CIUSSS de l'Estrie - CHUS), Sherbrooke, Quebec, Canada
| | - G Leonard
- Research Center on Aging, Centre intégré universitaire de santé et de services sociaux de l'Estrie - Centre hospitalier universitaire de Sherbrooke (CIUSSS de l'Estrie - CHUS), Sherbrooke, Quebec, Canada.,School of Rehabilitation, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
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Cuss CW, Donner MW, Grant-Weaver I, Noernberg T, Pelletier R, Sinnatamby RN, Shotyk W. Measuring the distribution of trace elements amongst dissolved colloidal species as a fingerprint for the contribution of tributaries to large boreal rivers. Sci Total Environ 2018; 642:1242-1251. [PMID: 30045505 DOI: 10.1016/j.scitotenv.2018.06.099] [Citation(s) in RCA: 8] [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] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Revised: 06/04/2018] [Accepted: 06/08/2018] [Indexed: 06/08/2023]
Abstract
Organic and inorganic colloids play important roles governing the speciation, transport, and bioaccessibility of trace elements in aquatic systems. These carriers are especially important in the boreal zone, where rivers that contain high concentrations of iron and organic matter are prevalent. The distribution of trace elements amongst different colloidal species (or "speciation profile") can therefore be useful as a fingerprint to detect different trace element sources and for tracking colloid transformations, with implications for bioaccessibility. Asymmetrical flow field-flow fractionation coupled to an inductively coupled plasma mass spectrometer was applied to detect the source of trace elements based on their speciation profile along a 125-km stretch of a large river in the Canadian boreal forest. Both the concentration and proportion of bound trace elements were increased by tributary inputs: bound As, Co, Fe, Mn, Pb, U, and Zn increased monotonically from upstream to downstream, increasingly resembling the speciation profile of tributaries. Principal component (PC) analysis also revealed tributary contributions of bound Cu, Ni, Th, V, and Y reflecting their higher concentrations in tributaries, and PC scores also increased monotonically from upstream-downstream. Monotonically decreasing concentrations of mainly ionic and small (i.e. <ca. 300 Da) As, Ba, Mo, and U species were also observed from upstream-downstream.
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Affiliation(s)
- C W Cuss
- Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2H1, Canada.
| | - M W Donner
- Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2H1, Canada.
| | - I Grant-Weaver
- Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2H1, Canada.
| | - T Noernberg
- Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2H1, Canada.
| | - R Pelletier
- Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2H1, Canada.
| | - R N Sinnatamby
- Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2H1, Canada.
| | - W Shotyk
- Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2H1, Canada.
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Peters TM, Pelletier R, Behlouli H, Rossi AM, Pilote L. Excess psychosocial burden in women with diabetes and premature acute coronary syndrome. Diabet Med 2017; 34:1568-1574. [PMID: 28799212 DOI: 10.1111/dme.13452] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 08/08/2017] [Indexed: 11/28/2022]
Abstract
AIM Diabetes is a stronger risk factor for acute coronary syndrome for women than men. We investigate whether behavioural and psychosocial factors contribute to the disparity in acute coronary syndrome risk and outcomes among women with diabetes relative to women without diabetes and men. METHODS Among 939 participants in the GENESIS-PRAXY cohort study of premature acute coronary syndrome (age ≤ 55 years), we compared the prevalence of traditional and non-traditional factors by sex and Type 2 diabetes status. In a case-only analysis, we used generalized logit models to investigate the influence of traditional and non-traditional factors on the interaction of sex and diabetes. RESULTS In 287 women (14.3% with diabetes) and 652 men (10.4% with diabetes), women and men with diabetes showed a heavier burden of traditional cardiac risk factors compared with individuals without diabetes. Women with diabetes were more likely to be the primary earner and have more anxiety relative to women without diabetes, and reported worse perceived health compared with women without diabetes and men with diabetes. The interaction term for sex and diabetes (odds ratio (OR) 1.40, 95% confidence intervals (95% CI) 0.83-2.36) was diminished after additional adjustment for non-traditional factors (OR 1.12, 95% CI 0.54-2.32), but not traditional factors alone (OR 1.41, 95% CI 0.84-2.36). CONCLUSIONS We observed trends toward a more adverse psychosocial profile among women with diabetes and incident acute coronary syndrome compared with women without diabetes and men with diabetes, which may explain the increased risk of acute coronary syndrome in women with diabetes and may also contribute to worse outcomes.
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Affiliation(s)
- T M Peters
- Department of Medicine, McGill University Health Centre, Montreal, Quebec, Canada
| | - R Pelletier
- Divisions of Clinical Epidemiology and General Internal Medicine, The Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
| | - H Behlouli
- Divisions of Clinical Epidemiology and General Internal Medicine, The Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
| | - A M Rossi
- Divisions of Clinical Epidemiology and General Internal Medicine, The Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
| | - L Pilote
- Department of Medicine, McGill University Health Centre, Montreal, Quebec, Canada
- Divisions of Clinical Epidemiology and General Internal Medicine, The Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
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Sepehrvand N, Alemayehu W, Kaul P, Pelletier R, Bello A, Welsh R, Armstrong P, Ezekowitz J. P2763Factors influencing ambulance use in patients with suspected acute coronary syndromes: a population-based geographic information system study. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2763] [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: 11/13/2022] Open
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Lemonnier F, Safar V, Cottereau A, Fataccioli V, Chaillol I, Pelletier R, Letourneau A, Dupuy A, Bossard C, Martin A, Robe C, Pelletier L, Pujals A, Bachy E, Delmer A, Moles Moreau M, Tilly H, Parrens M, Delfau-Larue M, Missiaglia E, Meignan M, de Leval L, Haioun C, Gaulard P. INTEGRATIVE ANALYSIS OF FEATURES ASSOCIATED WITH TET2, IDH2, DNMT3A, AND RHOA MUTATIONS IN ANGIOIMMUNOBLASTIC T CELL LYMPHOMA: A LYSA STUDY. Hematol Oncol 2017. [DOI: 10.1002/hon.2438_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- F. Lemonnier
- INSERMU955, Unité Hémopathies Lymphoïdes; Université Paris Est, Hôpitaux universitaire Henri Mondor; Créteil France
| | - V. Safar
- Hématologie clinique; Centre Hopsitalier Lyon Sud; Pierre Bénite France
| | - A. Cottereau
- Médecine nucléaire; Hôpital Tenon, APHP; Paris France
| | - V. Fataccioli
- INSERMU955; Institut Mondor de Recherche Biomédicale; Créteil France
| | - I. Chaillol
- Lysarc; Centre Hospitalier Lyon Sud; Pierre Bénite France
| | - R. Pelletier
- INSERMU955; Institut Mondor de Recherche Biomédicale; Créteil France
| | - A. Letourneau
- Pathologie; Centre Hospitalier Universitaire Vaudois; Lausanne Switzerland
| | - A. Dupuy
- INSERMU955; Institut Mondor de Recherche Biomédicale; Créteil France
| | - C. Bossard
- Anatomie et cytologie pathologique; Hotel Dieu, CHU Nantes; Nantes France
| | - A. Martin
- anatomie pathologique, Hôpital Avicenne; Bobigny France
| | - C. Robe
- INSERMU955; Institut Mondor de Recherche Biomédicale; Créteil France
| | - L. Pelletier
- INSERMU955; Institut Mondor de Recherche Biomédicale; Créteil France
| | - A. Pujals
- INSERMU955, Département de Pathologie; Université Paris Est, Hôpitaux Universitaires Henri Mondor; Créteil France
| | - E. Bachy
- Lysarc; Centre Hospitalier Lyon Sud; Pierre Bénite France
| | - A. Delmer
- hématologie clinique; centre hospitalier universitaire; Reims France
| | - M. Moles Moreau
- hématologie clinique; centre hospitalier universitaire; Angers France
| | - H. Tilly
- Hématologie clinique; CLCC Henri Becquerel; Rouen France
| | - M. Parrens
- Pathologie; Hôpital Haut-Lévêque; Pessac France
| | - M. Delfau-Larue
- Immunologie biologique; Hôpitaux universitaires Henri Mondor; Créteil France
| | - E. Missiaglia
- Pathologie; Centre Hospitalier Universitaire Vaudois; Lausanne Switzerland
| | - M. Meignan
- LYSA image; Hôpitaux Universitaires Henri Mondor; Créteil France
| | - L. de Leval
- Pathologie; Centre Hospitalier Universitaire Vaudois; Lausanne Switzerland
| | - C. Haioun
- INSERMU955, Unité Hémopathies Lymphoïdes; Université Paris Est, Hôpitaux universitaire Henri Mondor; Créteil France
| | - P. Gaulard
- INSERMU955, Département de Pathologie; Université Paris Est, Hôpitaux Universitaires Henri Mondor; Créteil France
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Peters T, Pelletier R, Behlouli H, Pilote L. EXPLORING THE DIABETIC DIVIDE: EXCESS BURDEN OF NON-TRADITIONAL CARDIOVASCULAR RISK FACTORS AMONG DIABETIC WOMEN WITH PREMATURE ACUTE CORONARY SYNDROME, THE GENESIS-PRAXY COHORT. Can J Cardiol 2016. [DOI: 10.1016/j.cjca.2016.07.321] [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: 11/16/2022] Open
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14
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Norris C, Johnson N, Hardwicke-Brown E, McEwan M, Pelletier R, Pilote L. Sex Differences in Health Status May be Better Explained by Gender Related Characteristics, than Biological Sex Characteristics. Can J Cardiol 2016. [DOI: 10.1016/j.cjca.2016.02.044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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15
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Flechner SM, Leeser D, Pelletier R, Morgievich M, Miller K, Thompson L, McGuire S, Sinacore J, Hil G. "Do the Right Thing. It Will Gratify Some People and Astonish the Rest."--M. Twain. Am J Transplant 2016; 16:1039-40. [PMID: 26613818 DOI: 10.1111/ajt.13640] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- S M Flechner
- Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
| | - D Leeser
- Department of Surgery, University of Maryland, Baltimore, MD
| | - R Pelletier
- Department of Surgery, Ohio State University, Columbus, OH
| | - M Morgievich
- Living Donor Institute, St. Barnabas Medical Center, Livingston, NJ
| | - K Miller
- Department of Surgery, University of Wisconsin, Madison, WI
| | - L Thompson
- Department of Surgery, University of Maryland, Baltimore, MD
| | - S McGuire
- Department of Urology, UCLA, Los Angeles, CA
| | - J Sinacore
- Research and Education, National Kidney Registry, Babylon, NY
| | - G Hil
- Research and Education, National Kidney Registry, Babylon, NY
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Choi J, Winters N, Pelletier R, Eisenberg M, Bacon S, Cox J, Daskalopoulou S, Lavoie K, Karp I, Shimony A, So D, Thanassoulis G, Pilote L. SEX DIFFERENCES IN CLINICAL OUTCOMES AFTER PREMATURE ACUTE CORONARY SYNDROME. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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17
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Flechner SM, Leeser D, Pelletier R, Morgievich M, Miller K, Thompson L, McGuire S, Sinacore J, Hil G. The Incorporation of an Advanced Donation Program Into Kidney Paired Exchange: Initial Experience of the National Kidney Registry. Am J Transplant 2015; 15:2712-7. [PMID: 26012533 DOI: 10.1111/ajt.13339] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [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: 02/09/2015] [Revised: 03/17/2015] [Accepted: 03/31/2015] [Indexed: 01/25/2023]
Abstract
The continued growth of kidney paired donation (KPD) to facilitate transplantation for otherwise incompatible or suboptimal living kidney donors and recipients has depended on a balance between the logistics required for patients and the collaborating transplant centers. The formation of chains for KPD and the shipping of kidneys have permitted networks such as the National Kidney Registry (NKR) to offer KPD to patients over a transcontinental area. However, over the last 3 years, we have encountered patient requests for a more flexible experience in KPD to meet their individual needs often due to rigid time constraints. To accommodate these requests, we have developed an Advanced Donation Program (ADP) in which the donor desires to donate by a specific date, but their paired recipient has not yet been matched to a specific donor or scheduled for surgery. After obtaining careful informed consent from both the donor and paired recipient, 10 KPD chains were constructed using an ADP donor. These 10 ADP donors have facilitated 47 transplants, and thus far eight of their paired recipients have received a kidney within a mean of 178 (range 10-562) days. The ADP is a viable method to support time limited donors in a KPD network.
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Affiliation(s)
- S M Flechner
- Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
| | - D Leeser
- Department of Surgery, University of Maryland, Baltimore, MD
| | - R Pelletier
- Department of Surgery, The Ohio State University, Columbus, OH
| | - M Morgievich
- Living Donor Institute, St. Barnabas Medical Center, Livingston, NJ
| | - K Miller
- Department of Surgery, University of Wisconsin, Madison, WI
| | - L Thompson
- Department of Surgery, University of Maryland, Baltimore, MD
| | - S McGuire
- Department of Urology, UCLA, Los Angeles, CA
| | - J Sinacore
- Research and Education, National Kidney Registry, Babylon, NY
| | - G Hil
- Research and Education, National Kidney Registry, Babylon, NY
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Austin A, Pelletier R, Rabi D, Behlouli H, Pilote L, Investigators GP. FACTORS ASSOCIATED WITH STUDY COMPLETION IN PATIENTS WITH PREMATURE ACUTE CORONARY SYNDROME. Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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19
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Pelletier R, Humphries K, Khan N, Eisenberg M, Cox J, Norris C, Pilote L. GENDER, SEX, AND OUTCOMES IN PATIENTS WITH PREMATURE ACUTE CORONARY SYNDROME. Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.252] [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: 10/24/2022] Open
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20
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Yinko SSL, Pelletier R, Behlouli H, Lavoie K, Bacon S, Daskalopoulou S, Thanassoulis G, Karp I, Eisenberg M, Pilote L, Investigators GP. BARRIERS TO IMPROVEMENTS IN FRUIT AND VEGETABLE INTAKE AFTER PREMATURE ACUTE CORONARY SYNDROME: WHAT IS THE ROLE OF DIETARY COUNSELLING AND PATIENT CHARACTERISTICS? Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.218] [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: 10/24/2022] Open
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21
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Leung Yinko S, Pelletier R, Norris C, Karp I, Bacon S, Behlouli H, Pilote L. Health-Related Quality of Life in Patients With Premature Acute Coronary Syndrome: Does Biological Sex Really Matter? Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.459] [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: 10/26/2022] Open
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22
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Khan N, Avgil M, Norris C, Pelletier R, Bacon S, Thanassoulis G, Daskalopoulou S, Behlouli H, Karp I, Pilote L. Sex Differences in Prodromal Symptoms and Health Seeking Behaviors for Acute Coronary Syndrome. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.491] [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: 11/27/2022] Open
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23
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Litvinov IV, St-Germain G, Pelletier R, Paradis M, Sheppard DC. Endemic human blastomycosis in Quebec, Canada, 1988-2011. Epidemiol Infect 2013; 141:1143-7. [PMID: 22929032 PMCID: PMC9151826 DOI: 10.1017/s0950268812001860] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [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: 04/04/2012] [Revised: 07/26/2012] [Accepted: 07/31/2012] [Indexed: 11/06/2022] Open
Abstract
Blastomycosis is a systemic fungal infection found in various parts of the world. A review of literature for Quebec, Canada revealed only few case reports with the most recent one dating back to 1993. However, whether Quebec represents an important endemic region for blastomycosis in North America is unknown. In this work we reviewed 158 cases of human blastomycosis documented in Quebec during 1988-2011 using microbiological records available from the provincial public health laboratory. The estimated annual incidence of blastomycosis in the province is was ~0·133 cases per 100 000 individuals with the highest rates of 0·79 and 0·46 cases per 100 000 recorded in South-eastern and South-western Quebec. Moreover, the annual incidence rate significantly increased over the past 20 years. This study for the first time establishes Quebec as an important endemic region for Blastomyces dermatitidis.
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Affiliation(s)
- I V Litvinov
- Division of Dermatology, McGill University, Montreal, Quebec, Canada.
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Neil A, Ens S, Pelletier R, Jarus T, Rand D. Sony PlayStation EyeToy elicits higher levels of movement than the Nintendo Wii: implications for stroke rehabilitation. Eur J Phys Rehabil Med 2013; 49:13-21. [PMID: 23172403] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
BACKGROUND Virtual reality (VR) is an emerging trend in stroke rehabilitation. VR gaming consoles in stroke intervention have been shown to increase motivation and enjoyment during exercise. The amount and intensity of movements elicited using these consoles are unknown. AIMS The aims of this study were: (1) to quantify the amount and intensity of movement elicited from both hands of two groups of individuals ([chronic stroke and without a disability [healthy]); (2) to determine the effect of console (Wii/EyeToy) and group (stroke/healthy) on the amount and intensity of upper extremity movement; (3) to determine the effect of console (Wii/EyeToy) and group (stroke/healthy) on the usability and VR experience. DESIGN A cross-sectional design was taken. SETTING Outpatient rehabilitation setting and healthy participant's homes. POPULATION Participants included ten adults with stroke and ten adults without a disability. METHODS Participants experienced two games from each console. Amount and intensity of movement was measured using accelerometers on both wrists, while the virtual experience and usability was determined with questionnaires. RESULTS No significant differences were found between the consoles usability and experience. EyeToy elicited significantly greater activity count than Wii among the healthy participants (P=0.028) and significantly greater movement intensity in both the stroke (P=0.005) and healthy (P=0.005) groups. CONCLUSION Both consoles rated high for usability, enjoyment and satisfaction highlighting their suitability for a range of individuals in stroke rehabilitation. EyeToy provides increased movement and movement intensity. CLINICAL REHABILITATION IMPACT Both consoles are suitable for use in stroke rehabilitation however this information can be helpful to clinicians while selecting a gaming console according to the type and intensity of movements that he/she aims to encourage during therapy.
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Affiliation(s)
- A Neil
- Abilities Neurological Rehabilitation, Vancouver, Canada
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25
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Brady R, Mcavin J, Peter J, Pelletier R. Continued Polymerase Chain Reaction Assay Stability Over Time and in a Changing Thermal Environment. Am J Clin Pathol 2012. [DOI: 10.1093/ajcp/138.suppl2.162] [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: 11/14/2022] Open
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Abstract
In the testis, Sertoli cells play a key physiological role in that they support, nourish, and protect germ cells. Because of the importance of Sertoli cells, several laboratories have established a culture system of Sertoli cells. These cultures have been well developed in mammalian species, but to our knowledge no purified avian Sertoli cells culture has been described. The aim of this study was to isolate avian Sertoli cells and to investigate their function using a chicken model in an in vitro test system. Immature chicken Sertoli cells in culture present morphology similar to that of mammalian cells and conserve expression of the specific Sertoli marker, anti-Müllerian hormone. Furthermore, in contrast to mammals, they express the 3β-hydroxysteroid dehydrogenase enzyme. Stimulation of Sertoli cells with ovine follicle-stimulating hormone rapidly activates the 3 main downstream signaling pathways of the follicle-stimulating hormone receptor: cyclic( )adenosine monophosphate/protein kinase A, phosphatidylinositol 3-kinase/Akt, and mitogen-activated protein kinase pathways. In vitro, Sertoli cells are able to secrete lactate and inhibin and have conserved the phagocytosis property. Finally, avian Sertoli cells present 3 interesting characteristics: they actively proliferate in vitro, can be passaged several times, and are suitable for freezing in nitrogen. A direct consequence of these properties is to use this cell culture test system as an alternative method to bird reprotoxicity studies.
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Affiliation(s)
- E Guibert
- CNRS Université de Tours Haras Nationaux, Physiologie de la Reproduction et des Comportements, 37380 Nouzilly, France
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27
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Satoskar AA, Pelletier R, Adams P, Nadasdy GM, Brodsky S, Pesavento T, Henry M, Nadasdy T. De novo thrombotic microangiopathy in renal allograft biopsies-role of antibody-mediated rejection. Am J Transplant 2010; 10:1804-11. [PMID: 20659088 DOI: 10.1111/j.1600-6143.2010.03178.x] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The most common cause of thrombotic microangiopathy (TMA) in renal allografts is thought to be calcineurin inhibitor toxicity. Antibody-mediated rejection (AMR) can also cause TMA, but its true impact on de novo TMA is unknown. In a retrospective review of renal allograft biopsies from January 2003 to December 2008 at our institution, we determined the prevalence of TMA in patients with C4d positive (n = 243) and C4d negative (n = 715) biopsies. Over 90% of patients received cyclosporine in both groups. De novo TMA was seen in 59 (6.1%) patients; most of them (55%) with C4d positive biopsy. Among patients with C4d positive biopsies, 13.6% had TMA, as compared to only 3.6% patients with C4d negative biopsies (p < 0.0001). Incidence of graft loss between C4d positive and C4d negative TMA groups was not significantly different, but 70% of patients with C4d positive TMA who received plasmapheresis had slightly lower graft loss rate. In biopsies with AMR-associated TMA, glomerulitis and peritubular capillaritis were significantly more prominent. AMR is the most common cause of TMA in renal allografts in our patient population. It is important to recognize AMR-related TMA because plasmapheresis treatment may be beneficial.
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Affiliation(s)
- A A Satoskar
- Department of Pathology, Ohio State University, Columbus, OH, USA.
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28
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Du H, Matsushima T, Spyvee M, Goto M, Shirota H, Gusovsky F, Chiba K, Kotake M, Yoneda N, Eguchi Y, DiPietro L, Harmange JC, Gilbert S, Li XY, Davis H, Jiang Y, Zhang Z, Pelletier R, Wong N, Sakurai H, Yang H, Ito-Igarashi H, Kimura A, Kuboi Y, Mizui Y, Tanaka I, Ikemori-Kawada M, Kawakami Y, Inoue A, Kawai T, Kishi Y, Wang Y. Discovery of a potent, metabolically stabilized resorcylic lactone as an anti-inflammatory lead. Bioorg Med Chem Lett 2009; 19:6196-9. [PMID: 19783437 DOI: 10.1016/j.bmcl.2009.08.096] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Revised: 08/26/2009] [Accepted: 08/31/2009] [Indexed: 10/20/2022]
Abstract
With bioactivity-guided phenotype screenings, a potent anti-inflammatory compound f152A1 has been isolated, characterized and identified as the known natural product LL-Z1640-2. Metabolic instability precluded its use for the study on animal disease models. Via total synthesis, a potent, metabolically stabilized analog ER-803064 has been created; addition of the (S)-Me group at C4 onto f152A1 has resulted in a dramatic improvement on its metabolic stability, while preserving the anti-inflammatory activities.
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Affiliation(s)
- H Du
- Eisai Research Institute of Boston, 4 Corporate Drive, Andover, MA 01810, USA
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29
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Pelletier R, Foidart JM, Nisolle M. [How I explore ... the bleeding of vaginal origin in childhood]. Rev Med Liege 2009; 64:219-222. [PMID: 19514542] [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] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Prepubertal vaginal bleeding is considered as isolated menarche, when thorough medical examination does not show other signs of sexual development or any detectable uterine or vaginal abnormalities (infection, foreign bodies, tumors, trauma...). If other puberty signs (thelarche, pubarche, peak of growth...) develop, the vaginal bleeding will not be isolated any more and we will consequently speak of true early puberty. It is thus the follow-up of the patient which will allow to make the differential diagnosis between precocious and benign isolated menarche and true early puberty determining the statural future and requiring a specific treatment. The etiology of prepubertal menarche remains unclear, and more research is needed to establish causation. Several complementary examinations must be carried out in order to exclude tumoral, infectious, traumatic or hormonal pathologies and those must be repeated during the follow-up of the patient.
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30
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Mimee B, Pelletier R, Bélanger RR. In vitro antibacterial activity and antifungal mode of action of flocculosin, a membrane-active cellobiose lipid. J Appl Microbiol 2009; 107:989-96. [PMID: 19486430 DOI: 10.1111/j.1365-2672.2009.04280.x] [Citation(s) in RCA: 27] [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] [Indexed: 11/30/2022]
Abstract
AIMS To investigate the in vitro antibacterial activity and antifungal mode of action of flocculosin, a cellobiose lipid produced by Pseudozyma flocculosa. METHODS AND RESULTS When tested against clinical bacterial isolates, the compound was particularly active against Gram-positive bacteria and its effect was not mitigated against isolates known as resistant to other antibiotics. The antifungal activity of flocculosin was found to be rapid and concentration-dependent. At lethal concentrations against Candida albicans, flocculosin caused a rapid leakage of intracellular potassium and inhibited acidification of the medium by plasma membrane ATPases suggesting a physical rather than a biochemical effect. TEM observations of cells exposed 6 h to flocculosin revealed disrupted membranes and disorganized mitochondria. CONCLUSIONS Data obtained in this study confirm that flocculosin acts by disrupting the membrane surface of sensitive micro-organisms. SIGNIFICANCE AND IMPACT OF THE STUDY The elucidation of an antifungal mode of action of flocculosin can be exploited in furthering its antimicrobial potential against fungi and bacteria whose cell membranes are particularly sensitive to the action of the molecule.
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Affiliation(s)
- B Mimee
- Centre de Recherche en Horticulture, Université Laval, Québec, Canada
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31
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Bickerstaff A, Nozaki T, Wang JJ, Pelletier R, Hadley G, Nadasdy G, Nadasdy T, Fairchild RL. Acute humoral rejection of renal allografts in CCR5(-/-) recipients. Am J Transplant 2008; 8:557-66. [PMID: 18294152 DOI: 10.1111/j.1600-6143.2007.02125.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Increasing detection of acute humoral rejection (AHR) of renal allografts has generated the need for appropriate animal models to investigate underlying mechanisms. Murine recipients lacking the chemokine receptor CCR5 reject cardiac allografts with marked C3d deposition in the parenchymal capillaries and high serum donor-reactive antibody titers, features consistent with AHR. The rejection of MHC-mismatched renal allografts from A/J (H-2(a)) donors by B6.CCR5(-/-) (H-2(b)) recipients was investigated. A/J renal allografts survived longer than 100 days in wild-type C57BL/6 recipients with normal blood creatinine levels (28 +/- 7 micromol/L). All CCR5(-/-) recipients rejected renal allografts within 21 days posttransplant (mean 13.3 +/- 4 days) with elevated creatinine (90 +/- 31 micromol/L). The rejected allografts had neutrophil and macrophage margination and diffuse C3d deposition in peritubular capillaries, interstitial hemorrhage and edema, and glomerular fibrin deposition. Circulating donor-reactive antibody titers were 40-fold higher in B6.CCR5(-/-) versus wild-type recipients. Depletion of recipient CD8 T cells did not circumvent rejection of the renal allografts by CCR5-deficient recipients. In contrast, microMT(-/-)/CCR5(-/-) recipients, incapable of producing antibody, did not reject most renal allografts. Collectively, these results indicate the rapid rejection of renal allografts in CCR5(-/-) recipients with many histopathologic features observed during AHR of human renal allografts.
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Affiliation(s)
- A Bickerstaff
- Department of Surgery, Transplantation Division, The Ohio State University College of Medicine, Columbus, OH, USA
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Abstract
The Platelia Aspergillus assay tested positive in 8 of 11 patients with disseminated histoplasmosis. While other available methods for diagnosis have several drawbacks, this cross-reactivity is particularly valuable in the perspective of practitioners outside the USA who cannot use the test detecting antigen of Histoplasma capsulatum.
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Affiliation(s)
- S Ranque
- Laboratoire de Parasitologie-Mycologie, AP-HM Timone, Marseille Cedex 5, France.
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33
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Girouard G, Lachance C, Pelletier R. Observations on (1-3)-β-d-glucan detection as a diagnostic tool in endemic mycosis caused by Histoplasma or Blastomyces. J Med Microbiol 2007; 56:1001-1002. [PMID: 17577071 DOI: 10.1099/jmm.0.47162-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- G Girouard
- L'Hotel Dieu de Quebec du CHUQ, 11 Cote du Palais, Quebec, QC G1R 2J6, Canada
| | - C Lachance
- L'Hotel Dieu de Quebec du CHUQ, 11 Cote du Palais, Quebec, QC G1R 2J6, Canada
| | - R Pelletier
- L'Hotel Dieu de Quebec du CHUQ, 11 Cote du Palais, Quebec, QC G1R 2J6, Canada
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Faure AK, Aknin-Seifer I, Frérot G, Pelletier R, De Robertis C, Cans C, Levy R, Jimenez C, Lejeune H, Terrier N, Bergues U, Hennebicq S, Rousseaux S. Predictive factors for an increased risk of sperm aneuploidies in oligo-astheno-teratozoospermic males. ACTA ACUST UNITED AC 2007; 30:153-62. [PMID: 17239087 DOI: 10.1111/j.1365-2605.2006.00726.x] [Citation(s) in RCA: 28] [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: 12/25/2022]
Abstract
Patients with severe spermatogenesis impairment can now successfully father a child thanks to the use of intracytoplasmic sperm injection (ICSI). In oligozoospermic patients, many studies have reported significantly higher sperm aneuploidy rates and therefore an increased risk of transmitting a chromosomal abnormality via the injection of abnormal spermatozoa. However, the frequency of aneuploidy is highly variable between patients. The aim of the present work was to identify clinical and biological factors, which, together with non-obstructive oligozoospermia, could be predictive of elevated sperm aneuploidies. The sperm aneuploidy rates for chromosomes X, Y, 13, 18 and 21 were assessed in 31 infertile men with well-characterized spermatogenesis impairment, and in a population of control men with proven fertility. The frequency of sperm aneuploidy was compared between several patient subgroups according to their clinical and biological factors. Nearly half of the oligozoospermic males (15/31) had a significantly increased disomy rate for at least one of the five chromosomes compared with that observed in the control population (mean disomy rates + 1.96 standard deviation). Factors significantly associated with higher numbers of aneuploid sperm were cigarette smoking, an elevated follicle-stimulating hormone level, a sperm concentration less than 1 m/mL, and a severe teratozoospermia. Hence, several factors predictive of an increased risk of sperm aneuploidy rates were identified in ICSI male candidates with a non-obstructive oligozoospermia.
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35
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Puymirat J, Pelletier R. T.P.1 01 RNA-based gene therapy for dominantly inherited neuromuscular disorders. Neuromuscul Disord 2006. [DOI: 10.1016/j.nmd.2006.05.137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Faure AK, Pivot-Pajot C, Kerjean A, Hazzouri M, Pelletier R, Péoc'h M, Sèle B, Khochbin S, Rousseaux S. Misregulation of histone acetylation in Sertoli cell-only syndrome and testicular cancer. Mol Hum Reprod 2004; 9:757-63. [PMID: 14614037 DOI: 10.1093/molehr/gag101] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [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: 11/14/2022] Open
Abstract
In many species, including humans, chromatin remodelling during spermiogenesis is initiated with a marked increase in histone acetylation in elongating spermatids. We have investigated whether this process is disturbed when spermatogenesis is defective or in human testicular tumours. For this purpose, the presence of highly acetylated histone H4 was detected on testicular sections from men with a severe impairment of spermatogenesis of several origins, as well as in different types of testicular tumours. In most tubules devoid of germinal cells (including SCO, Sertoli cell only syndromes) or lacking spermatocytes and spermatids, the Sertoli cells' nuclei showed a global increase in histone H4 acetylation. A similar observation was made in the peritumoral seminiferous tubules of testicular tumour tissues, whenever they were lacking germinal cells, with carcinoma in situ (CIS) cells being hypoacetylated. The global hyperacetylation of elongating spermatids during spermatogenesis could be part of an intercellular signalling pathway involving Sertoli cells and germinal cells, which could be disturbed in cases of severe spermatogenesis impairment, as well as in tubes surrounding germ cells in testicular tumours.
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Affiliation(s)
- A K Faure
- Unité INSERM U309, Université Joseph Fourier, Institut Albert Bonniot, Faculté de Médecine de Grenoble, Domaine de la Merci, 38706 La Tronche Cedex, France
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Best LM, Haldane DJM, Keelan M, Taylor DE, Thomson ABR, Loo V, Fallone CA, Lyn P, Smaill FM, Hunt R, Gaudreau C, Kennedy J, Alfa M, Pelletier R, Veldhuyzen Van Zanten SJO. Multilaboratory comparison of proficiencies in susceptibility testing of Helicobacter pylori and correlation between agar dilution and E test methods. Antimicrob Agents Chemother 2004; 47:3138-44. [PMID: 14506021 PMCID: PMC201128 DOI: 10.1128/aac.47.10.3138-3144.2003] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Susceptibility testing was performed at seven Canadian microbiology laboratories and the Helicobacter Reference Laboratory, Halifax, Nova Scotia, Canada, to assess susceptibility testing proficiency and the reproducibility of the results for clarithromycin and metronidazole and to compare the Epsilometer test (E test) method to the agar dilution reference method. Control strain Helicobacter pylori ATCC 43504 (American Type Culture Collection) and 13 clinical isolates (plus duplicates of four of these strains including ATCC 43504) were tested blindly. The National Committee for Clinical Laboratory Standards (NCCLS) guidelines for agar dilution testing were followed, and the same suspension of organisms was used for agar dilution and E test. Antimicrobials and E test strips were provided to the investigators. Methods were provided on a website (www.Helicobactercanada.org). Each center reported MICs within the stated range for strain ATCC 43504. Compared to the average MICs, interlaboratory agreements within 2 log(2) dilutions were 90% (range, 69 to 100%) for clarithromycin by agar dilution, with seven very major errors [VMEs], and 85% (range, 65 to 100%) by E test, with three VMEs. Interlaboratory agreements within 2 log(2) dilutions were 83% (range, 50 to 100%) for metronidazole by agar dilution, with six VMEs and eight major errors (MEs), and 75% (range, 50 to 94%) by E test, with four VMEs and four MEs. At lower and higher concentrations of antibiotic, E test MICs were slightly different from agar dilution MICs, but these differences did not result in errors. When a standardized protocol based on NCCLS guidelines was used, most participants in this study correctly identified clarithromycin- and metronidazole-susceptible and -resistant strains of H. pylori 93% of the time by either the agar dilution or E test method, and the numbers of errors were relatively equivalent by both methods.
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Affiliation(s)
- L M Best
- Queen Elizabeth II Center for Clinical Research, Halifax, Canada.
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Devillard F, Metzler-Guillemain C, Pelletier R, DeRobertis C, Bergues U, Hennebicq S, Guichaoua M, Sèle B, Rousseaux S. Polyploidy in large-headed sperm: FISH study of three cases. Hum Reprod 2002; 17:1292-8. [PMID: 11980754 DOI: 10.1093/humrep/17.5.1292] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.5] [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: 11/13/2022] Open
Abstract
BACKGROUND Macrocephalic or large headed sperm with multiflagella is a rare abnormality often associated with infertility. Sperm chromosomal abnormalities could be associated with this specific morphological abnormality. METHODS The cytogenetic content of large-headed sperm was assessed by dual and three-colour fluorescence in-situ hybridization in three patients carrying this specific morphological abnormality. RESULTS In all patients nearly all sperm contained at least one copy of each sex chromosome, and in more than half of them at least two copies of either chromosome 1 or 18 were identified. In some sperm a tetraploidy was found. CONCLUSIONS These observations suggested that both meiotic I and II divisions were affected by incomplete partition of homologous chromosomes during meiosis I and of sister chromatids during meiosis II associated with a failure of nuclear cleavage. Furthermore, they provide evidence for a clear relationship between a specific morphological abnormality of the sperm and their abnormal cytogenetic content. The treatment of infertility using ICSI would probably be unsuccessful and have a high genetic risk in these cases.
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Affiliation(s)
- F Devillard
- Laboratoire de Cytogénétique, Biologie de la Reproduction et CECOS, Centre Hospitalo-Universitaire de Grenoble, 38043 Grenoble cedex 09, France
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39
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Abstract
Intracytoplasmic sperm injection (ICSI) has given some patients with Klinefelter's syndrome (ie, men with an XXY sex-chromosome profile) the chance to become fathers, but the genetic makeup of the spermatozoa used for the injection is a concern. We studied the segregation of the sex chromosomes and chromosomes 1 and 21 by multicolour fluorescence in-situ hybridisation in a patient with non-mosaic Klinefelter's syndrome who was a candidate for ICSI. As other workers have found, we saw a higher rate of 24,XX and 24,XY spermatozoa in the patient than in controls. However, we also found a much higher frequency of disomy 21 in the spermatozoa of this patient than in controls (6.2 vs 0.4%). Any child conceived by ICSI using this man's sperm will thus have a proportionally higher risk of trisomy 21.
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40
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Rolfsmeier ML, Dixon MJ, Pessoa-Brandão L, Pelletier R, Miret JJ, Lahue RS. Cis-elements governing trinucleotide repeat instability in Saccharomyces cerevisiae. Genetics 2001; 157:1569-79. [PMID: 11290713 PMCID: PMC1461582 DOI: 10.1093/genetics/157.4.1569] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Trinucleotide repeat (TNR) instability in humans is governed by unique cis-elements. One element is a threshold, or minimal repeat length, conferring frequent mutations. Since thresholds have not been directly demonstrated in model systems, their molecular nature remains uncertain. Another element is sequence specificity. Unstable TNR sequences are almost always CNG, whose hairpin-forming ability is thought to promote instability by inhibiting DNA repair. To understand these cis-elements further, TNR expansions and contractions were monitored by yeast genetic assays. A threshold of approximately 15--17 repeats was observed for CTG expansions and contractions, indicating that thresholds function in organisms besides humans. Mutants lacking the flap endonuclease Rad27p showed little change in the expansion threshold, suggesting that this element is not altered by the presence or absence of flap processing. CNG or GNC sequences yielded frequent mutations, whereas A-T rich sequences were substantially more stable. This sequence analysis further supports a hairpin-mediated mechanism of TNR instability. Expansions and contractions occurred at comparable rates for CTG tract lengths between 15 and 25 repeats, indicating that expansions can comprise a significant fraction of mutations in yeast. These results indicate that several unique cis-elements of human TNR instability are functional in yeast.
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Affiliation(s)
- M L Rolfsmeier
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-6805, USA
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41
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St-Germain G, Laverdière M, Pelletier R, Bourgault AM, Libman M, Lemieux C, Noël G. Prevalence and antifungal susceptibility of 442 Candida isolates from blood and other normally sterile sites: results of a 2-year (1996 to 1998) multicenter surveillance study in Quebec, Canada. J Clin Microbiol 2001; 39:949-53. [PMID: 11230409 PMCID: PMC87855 DOI: 10.1128/jcm.39.3.949-953.2001] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.6] [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: 11/20/2022] Open
Abstract
During a 2-year surveillance program (1996 to 1998) in Quebec, Canada, 442 strains of Candida species were isolated from 415 patients in 51 hospitals. The distribution of species was as follows: Candida albicans, 54%; C. glabrata, 15%; C. parapsilosis, 12%; C. tropicalis, 9%; C. lusitaniae, 3%; C. krusei, 3%; and Candida spp., 3%. These data, compared to those of a 1985 survey, indicate variations in species distribution, with the proportions of C. glabrata and C. parapsilosis increasing by 9 and 4%, respectively, and those of C. albicans and C. tropicalis decreasing by 10 and 7%, respectively. However, these differences are statistically significant for C. glabrata and C. tropicalis only. MICs of amphotericin B were > or =4 microg/ml for 3% of isolates, all of which were non-C. albicans species. Three percent of C. albicans isolates were resistant to flucytosine (> or =32 microg/ml). Resistance to itraconazole (> or =1 microg/ml) and fluconazole (> or =64 microg/ml) was observed, respectively, in 1 and 1% of C. albicans, 14 and 9% of C. glabrata, 5 and 0% of C. tropicalis, and 0% of C. parapsilosis and C. lusitaniae isolates. Clinical data were obtained for 343 patients. The overall crude mortality rate was 38%, reflecting the multiple serious underlying illnesses found in these patients. Bloodstream infections were documented for 249 patients (73%). Overall, systemic triazoles had been administered to 10% of patients before the onset of candidiasis. The frequency of isolation of non-C. albicans species was significantly higher in this group of patients. Overall, only two C. albicans isolates were found to be resistant to fluconazole. These were obtained from an AIDS patient and a leukemia patient, both of whom had a history of previous exposure to fluconazole. At present, it appears that resistance to fluconazole in Quebec is rare and is restricted to patients with prior prolonged azole treatment.
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Affiliation(s)
- G St-Germain
- Laboratoire de Santé Publique du Québec, Institut National de Santé Publique, 20045 Chemin Sainte-Marie, Sainte-Anne-de-Bellevue, Québec H9X 3R5, Canada.
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42
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Pelletier-Allard N, Pelletier R, Delsart C. Hyperfine Zeeman effects in Pr3+:LaCl3using the fluorescence line-narrowing technique. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3719/10/11/035] [Citation(s) in RCA: 5] [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: 11/12/2022]
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Delsart C, Pelletier-Allard N, Pelletier R. Hyperfine structure of the 6011 AA line of Pr3+:LaCl3using the fluorescence line narrowing technique. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3700/8/17/008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Hazzouri M, Pivot-Pajot C, Faure AK, Usson Y, Pelletier R, Sèle B, Khochbin S, Rousseaux S. Regulated hyperacetylation of core histones during mouse spermatogenesis: involvement of histone deacetylases. Eur J Cell Biol 2000; 79:950-60. [PMID: 11152286 DOI: 10.1078/0171-9335-00123] [Citation(s) in RCA: 212] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Here we report a detailed analysis of waves of histone acetylation that occurs throughout spermatogenesis in mouse. Our data showed that spermatogonia and preleptotene spermatocytes contained acetylated core histones H2A, H2B and H4, whereas no acetylated histones were observed throughout meiosis in leptotene or pachytene spermatocytes. Histones remained unacetylated in most round spermatids. Acetylated forms of H2A and H2B, H3 and H4 reappeared in step 9 to 11 elongating spermatids, and disappeared later in condensing spermatids. The spatial distribution pattern of acetylated H4 within the spermatids nuclei, analyzed in 3D by immunofluorescence combined with confocal microscopy, showed a spatial sequence of events tightly associated with chromatin condensation. In order to gain an insight into mechanisms controlling histone hyperacetylation during spermiogenesis, we treated spermatogenic cells with a histone deacetylase inhibitor, trichostatin A (TSA), which showed a spectacular increase of histone acetylation in round spermatids. This observation suggests that deacetylases are responsible for maintaining a deacetylated state of histones in these cells. TSA treatment could not induce histone acetylation in condensing spermatids, suggesting that acetylated core histones are replaced by transition proteins without being previously deacetylated. Moreover, our data showed a dramatic decrease in histone deacetylases in condensing spermatids. Therefore, the regulation of histone deacetylase activity/concentration appears to play a major role in controling histone hyperacetylation and probably histone replacement during spermiogenesis.
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Affiliation(s)
- M Hazzouri
- Unite INSERM U309, UJF Grenoble, Institut Albert Bonniot, Domaine de la Merci, France
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Abstract
The B6.Y(TIR) mouse fails to develop normal testes despite transcription of Sry, the primary testis-determining gene on the Y chromosome. Consequently, B6.Y(TIR) fetuses with bilateral ovaries develop into apparently normal but infertile females. This infertility can be mainly attributed to oocyte incompatibility for postfertilization development. In addition, abnormality in preovulatory follicles and rapid loss of oocytes have been observed in XY ovaries. This study examined the effect of gonadotropins on follicular development and atresia in B6.Y(TIR) prepubertal females. The results show that untreated XY females had fewer late preantral follicles and their frequency of atresia was lower. No other difference was found when they were compared with XX females. After treatment with gonadotropins for 24 h, frequency of atresia decreased in both XX and XY ovaries. After 48 h, most preovulatory follicles in XY ovaries were nonatretic, but the oocytes often were denuded. Immunocytochemical staining for connexin 43 detected punctate foci along the oocyte plasma membrane. The density of these foci changed during follicular development, which was similar in XX and XY ovaries. In conclusion, follicular development and atresia under the control of gonadotropins is not influenced by defective oocytes until the preovulatory phase.
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Affiliation(s)
- J Wong
- Department of Biology and Urology Research Laboratory, Department of Surgery, McGill University, Montreal, Quebec, Canada H3A 1A1
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Pelletier R, Pravica V, Perrey C, Xia D, Ferguson RM, Hutchinson I, Orosz C. Evidence for a genetic predisposition towards acute rejection after kidney and simultaneous kidney-pancreas transplantation. Transplantation 2000; 70:674-80. [PMID: 10972228 DOI: 10.1097/00007890-200008270-00023] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.4] [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: 01/09/2023]
Abstract
BACKGROUND In vitro production of tumor necrosis factor-alpha (TNF-alpha), interferon-gamma (IFN-gamma), interleukin 10 (IL-10), and transforming growth factor-beta (TGF-beta) correlate with their respective genetic polymorphisms. We analyzed the relationship between these genetic polymorphisms and posttransplant outcome. METHODS Using DNA polymerase chain reaction (PCR) technology, polymorphisms for TNF-alpha, IFN-gamma, IL-10, and TGF-beta were determined for 82 kidney (K) and 19 simultaneous kidney-pancreas (SKP) recipients. These results were analyzed with regard to the incidence of acute rejection (AR), and the timing and severity of the first AR episode. RESULTS A high TNF-alpha production phenotype correlated with recurrent acute rejection (AR) episodes (P<0.026). Compared with the low TNF-alpha production phenotype, more patients with the high production phenotype had a post-AR serum creatinine >2.0 mg/dl, but this was not statistically significant (64 vs. 35%, P=0.12). There was no relationship between TNF-alpha genotype and the time to first AR episode or incidence of graft loss. IFN-gamma production phenotype showed no correlation with any of these clinical outcome parameters. There was an increase in AR incidence as the IL-10 production phenotype increased (low, intermediate, high), but only in low TNF-alpha producer phenotypes (P=0.023). CONCLUSIONS Patients with a polymorphic cytokine genotype putatively encoding for high in vivo TNF-alpha production, and to a lesser extent IL-10 cytokine genotypes putatively encoding for higher levels of in vivo IL-10 production, had a worse clinical outcome regarding AR episodes. These data support the hypothesis that the strength of alloimmune responsiveness after transplantation in part is genetically determined.
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Affiliation(s)
- R Pelletier
- Department of Surgery, Ohio State University College of Medicine, Columbus, 43210, USA
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Pelletier R, Peter J, Antin C, Gonzalez C, Wood L, Walsh TJ. Emergence of resistance of Candida albicans to clotrimazole in human immunodeficiency virus-infected children: in vitro and clinical correlations. J Clin Microbiol 2000; 38:1563-8. [PMID: 10747144 PMCID: PMC86490 DOI: 10.1128/jcm.38.4.1563-1568.2000] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [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: 11/20/2022] Open
Abstract
Oropharyngeal candidiasis (OPC) is a common opportunistic infection in human immunodeficiency virus (HIV)-infected patients and other immunocompromised hosts. Clotrimazole troches are widely used in the treatment of mucosal candidiasis. However, little is known about the potential contribution of clotrimazole resistance to the development of refractory mucosal candidiasis. We therefore investigated the potential emergence of resistance to clotrimazole in a prospectively monitored HIV-infected pediatric population receiving this azole. Adapting the National Committee for Clinical Laboratory Standards M27-A reference method for broth antifungal susceptibility testing of yeasts to clotrimazole, we compared MICs in macrodilution and microdilution assays. We further analyzed the correlation between these in vitro findings and the clinical response to antifungal therapy. One isolate from each of 87 HIV-infected children was studied by the macrodilution and microdilution methods. Two inoculum sizes were tested by the macrodilution method (10(3) and 10(4) CFU/ml) in order to assess the effect of inoculum size on clotrimazole MICs. The same isolates also were tested using a noncolorimetric microdilution method. Clotrimazole concentrations ranged from 0.03 to 16 microg/ml. Readings were performed after incubation for 24 and 48 h at 35 degrees C. For 62 (71.2%) of 87 clinical isolates, the MICs were low (< or =0.06 microg/ml). The MIC for 90% of the strains tested was 0.5 microg/ml, and the highest MIC was 8 microg/ml. There was no significant difference between MICs at the two inoculum sizes. There was 89% agreement (+/-1 tube) between the microdilution method at 24 h and the macrodilution method at 48 h. If the MIC of clotrimazole for an isolate of C. albicans was > or =0.5 microg/ml, there was a significant risk (P < 0.001) of cross-resistance to other azoles: fluconazole, > or = 8 microg/ml (relative risk [RR] = 8.9); itraconazole, > or =1 microg/ml (RR = 10). Resistance to clotrimazole was highly associated with clinically overt failure of antifungal azole therapy. Six (40%) of 15 patients for whom the clotrimazole MIC was > or =0.5 microg/ml required amphotericin B for refractory mucosal candidiasis versus 4 (5.5%) of 72 for whom the MIC was <0.5 microg/ml (P = 0.001; 95% confidence interval = 2.3 to 22; RR = 7.2). These findings suggest that an interpretive breakpoint of 0.5 microg/ml may be useful in defining clotrimazole resistance in C. albicans. The clinical laboratory's ability to determine MICs of clotrimazole may help to distinguish microbiologic resistance from the other causes of refractory OPC, possibly reducing the usage of systemic antifungal agents. We conclude that resistance to clotrimazole develops in isolates of C. albicans from HIV-infected children, that cross-resistance to other azoles may develop concomitantly, and that this resistance correlates with refractory mucosal candidiasis.
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Affiliation(s)
- R Pelletier
- Pediatric Oncology Branch, National Cancer Institute, Bethesda, MD 20892, USA
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48
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Hennebicq S, Pelletier R, Rousseaux S, Sèle B. Segregation of sex chromosomes in a klinefelter patient (47,xxy). Fertil Steril 2000. [DOI: 10.1016/s0015-0282(00)00505-7] [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] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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49
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Godin G, Naccache H, Pelletier R. Seeking medical advice if HIV symptoms are suspected. Qualitative study of beliefs among HIV-negative gay men. Can Fam Physician 2000; 46:861-8. [PMID: 10790818 PMCID: PMC2144804] [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] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
OBJECTIVE To identify beliefs associated with seeking medical advice promptly when symptoms of HIV infection are suspected among HIV-negative gay men. DESIGN Qualitative study of beliefs among focus group participants. SETTING Quebec city, Que, metropolitan area. PARTICIPANTS Referred sample of 20 HIV-negative gay men 18 to 45 years old who attended bars, university, or gay associations in Quebec city. METHOD Three focus groups of five to seven subjects were formed and each 2-hour session was tape-recorded. MAIN OUTCOME FINDINGS Participants thought that seeking medical advice promptly when symptoms of HIV are suspected would help them be informed about their health status and would eliminate unnecessary anxiety and fear, but would force them to face reality and make major changes. Barriers were the quality of the relationship with their physicians and concern about discussing their sexual lives. Normative beliefs were sought from members of community groups, circles of close friends, health providers, and the media. CONCLUSIONS Several beliefs could influence the motivation of seronegative gay men to seek medical advice promptly when symptoms of HIV infection are suspected. These beliefs should be integrated into programs promoting early consultation with physicians and into clinical counseling, as integration could facilitate early treatment and care. Physicians should give special attention to establishing relationships of trust with these patients.
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Affiliation(s)
- G Godin
- Laval University, St-Foy, Que.
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Abstract
The sperm nucleus has a unique chromatin structure where the DNA is highly condensed and associated with specific proteins, the protamines. It is a nondividing cell which is also transcriptionally inactive. After fusion with an oocyte, the sperm nucleus undergoes decondensation and, in the same time, starts replication and transcription. It has been suggested that somatic chromosomes during interphase are organized in territories which display a cell type and cell cycle specific distribution. The purpose of this work was to investigate whether chromosomes would also have a specific distribution in the sperm nucleus, which could be related to its inactive state, and have implications on the early stages of fertilization. In the present study, centromeric and telomeric sequences were detected by fluorescent techniques performed on human decondensed spermatozoa. Chromosome painting probes were used to detect the chromosome X and chromosome 13 on interphase sperm nuclei. The fluorescent signals were captured in 3D with a confocal microscope. For each of these chromatin structures, the volume, position, and distribution of the signals were analyzed in samples of 30 nuclei with the help of image analysis software. The centromeres appeared grouped in several foci that were randomly distributed within the sperm nucleus. The telomeres gave an approximately haploid number of small signals, evenly distributed throughout the nucleus. The chromosomes X and 13 occupied 4.7% and 3. 7% of the total nuclear volume, respectively. Interestingly, the X chromosome territory showed a preferential position in the anterior half of the volume of the nucleus, whereas chromosome 13 had a random position. This work shows a particular distribution of chromosome territories in the human sperm nucleus that could be related to mechanisms implicated in its specific functions. The analysis of more chromosomes and chromosomal structures, including the Y chromosome, would help to understand the structure of the human sperm chromatin, and its fundamental and clinical implications.
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Affiliation(s)
- M Hazzouri
- Unité INSERM U309, UJF, Institut Albert Bonniot, Faculté de Médecine de Grenoble, Domaine de la Merci, La Tronche, France
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