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Jiao Y, Pani A, Jang H, Dou Y, Smith J, Richard S. 3.139 ALTERATIONS IN MARKERS OF AGING IN SUBSTANTIA NIGRA OF MICE LACKING GLUTATHIONE S-TRANSFERASE PI (GSTPI). Parkinsonism Relat Disord 2012. [DOI: 10.1016/s1353-8020(11)70855-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Pasquié JL, Thireau J, Davy JM, Le Guennec JY, Richard S. Médicaments anti-arythmiques : Présent et futur. ARCHIVES OF CARDIOVASCULAR DISEASES SUPPLEMENTS 2011. [DOI: 10.1016/s1878-6480(11)70394-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Smith A, Krivak T, Scott E, Richard S. Outcome comparisons of dual-console robotic and laparoscopic surgery for gynecologic cancer in a fellowship program. Gynecol Oncol 2011. [DOI: 10.1016/j.ygyno.2011.07.044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Pierre S, Tarnowska K, Hachfi L, Coupé S, Simide R, Couvray S, Garnier C, Grimaldi M, Richard S, Gaillard S, Prévot-D'Alvise N, Grillasca JP. Effects of water temperature increase and heavy metals contamination on WAP65 gene expression in sea bass (Dicentrarchus labrax) liver. Cell Mol Biol (Noisy-le-grand) 2011; 57 Suppl:OL1614-OL1622. [PMID: 22047796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Accepted: 10/18/2011] [Indexed: 05/31/2023]
Abstract
It has been previously demonstrated that "Warm temperature Acclimation-related 65 kD Protein" (WAP65) is involved in temperature acclimation, response to intoxication and infection, as well as in development. The expression of wap65-1 was investigated in the liver of European sea bass (Dicentrarchus labrax) during exposure to the increased temperature (from 12 deg C to 30 deg C) and during intoxication with four heavy metals: lead, cadmium, copper and zinc. Post temperature increase wap65 expression was highest after one hour at 30 deg C. After 1 to 4 weeks at 30 deg C wap65 transcript levels did not differ from the 12 deg C control group, similar to observations regarding the heat shock protein, hsp70. Upregulation of wap65 was detected after treatment (intoxication) with cadmium (0.5 μg/l). In contrast, a slight, but significant down regulation of wap65 was seen after copper (5 μg/l) intoxication. These data indicate that functional analyses of WAP65 are needed to understand the differential regulation of this gene by metals. The role of WAP65 may be similar to that of HSP70, which has generalized functions in responding to certain stressors and maintaining normal cell physiology.
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Quinn TA, Granite S, Allessie MA, Antzelevitch C, Bollensdorff C, Bub G, Burton RAB, Cerbai E, Chen PS, Delmar M, Difrancesco D, Earm YE, Efimov IR, Egger M, Entcheva E, Fink M, Fischmeister R, Franz MR, Garny A, Giles WR, Hannes T, Harding SE, Hunter PJ, Iribe G, Jalife J, Johnson CR, Kass RS, Kodama I, Koren G, Lord P, Markhasin VS, Matsuoka S, McCulloch AD, Mirams GR, Morley GE, Nattel S, Noble D, Olesen SP, Panfilov AV, Trayanova NA, Ravens U, Richard S, Rosenbaum DS, Rudy Y, Sachs F, Sachse FB, Saint DA, Schotten U, Solovyova O, Taggart P, Tung L, Varró A, Volders PG, Wang K, Weiss JN, Wettwer E, White E, Wilders R, Winslow RL, Kohl P. Minimum Information about a Cardiac Electrophysiology Experiment (MICEE): standardised reporting for model reproducibility, interoperability, and data sharing. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2011; 107:4-10. [PMID: 21745496 PMCID: PMC3190048 DOI: 10.1016/j.pbiomolbio.2011.07.001] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Accepted: 07/01/2011] [Indexed: 11/21/2022]
Abstract
Cardiac experimental electrophysiology is in need of a well-defined Minimum Information Standard for recording, annotating, and reporting experimental data. As a step towards establishing this, we present a draft standard, called Minimum Information about a Cardiac Electrophysiology Experiment (MICEE). The ultimate goal is to develop a useful tool for cardiac electrophysiologists which facilitates and improves dissemination of the minimum information necessary for reproduction of cardiac electrophysiology research, allowing for easier comparison and utilisation of findings by others. It is hoped that this will enhance the integration of individual results into experimental, computational, and conceptual models. In its present form, this draft is intended for assessment and development by the research community. We invite the reader to join this effort, and, if deemed productive, implement the Minimum Information about a Cardiac Electrophysiology Experiment standard in their own work.
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Lacampagne A, Barthélémy I, Thibaud J, Blanchard-Gutton N, Unterfinger Y, Richard S, Ward C, Blot S. P1.30 Calcium sparks as dystrophic signals are present in GRMD muscles. Neuromuscul Disord 2011. [DOI: 10.1016/j.nmd.2011.06.790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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107
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Kannan N, Beriwal S, Kim H, Houser C, Mogus R, Sukumvanich P, Olawaiye A, Richard S, Kelley J, Edwards R, Edwards R. HDR Interstitial CT based Brachytherapy For the Treatment of Cervical Cancer: Early Results. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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108
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Richard S, Bencheikh K, Boulanger B, Levenson JA. Semiclassical model of triple photons generation in optical fibers. OPTICS LETTERS 2011; 36:3000-3002. [PMID: 21808385 DOI: 10.1364/ol.36.003000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this Letter we study spontaneous generation of triple photon states in optical fibers by third order spontaneous downconversion. Using a semiclassical approach we derive an explicit expression for the triple photons generation efficiency as a function of fiber parameters. We show that optical fibers with well suited index profiles and standard outer diameters could be the key component of future triple photons sources.
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Richard S, Samei E. WE-C-110-08: A Novel Phantom for CT Performance Assessment: Towards a Task-Based Measure of Image Quality. Med Phys 2011. [DOI: 10.1118/1.3613347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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110
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Richard S, Samei E. SU-D-301-06: Impact of Non-Stationarity in Breast Tomosynthesis on Task-Based Imaging Performance. Med Phys 2011. [DOI: 10.1118/1.3611548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Murphy S, Richard S, Samei E. WE-G-110-03: Directional MTF Measurement of Tomosynthesis Images Using a Cone-Based Technique. Med Phys 2011. [DOI: 10.1118/1.3613433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Correas JM, Joly D, Chauveau D, Richard S, Hélénon O. Insuffisance rénale et maladies kystiques du rein. ACTA ACUST UNITED AC 2011; 92:308-22. [DOI: 10.1016/j.jradio.2011.02.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Accepted: 02/25/2011] [Indexed: 11/24/2022]
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Rungruang B, Miller A, Richard S, Hamilton C, Rodriguez N, Bookman M, Maxwell G, Krivak T, Horowitz N. Should stage IIIC ovarian cancer be further stratified by intraperitoneal versus retroperitoneal-only disease? A Gynecologic Oncology Group study. Gynecol Oncol 2011. [DOI: 10.1016/j.ygyno.2010.12.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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114
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Skaznik-Wikiel M, Lesnock J, McBee W, Taylor S, Beriwal S, Smith A, Zorn K, Richard S, Krivak T, Edwards R. Intraperitoneal chemotherapy for recurrent ovarian cancer appears efficacious with high completion rates and low complications. Gynecol Oncol 2011. [DOI: 10.1016/j.ygyno.2010.12.074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Vanelslander P, Richard S, Bouguerrouche Y, Bouketouche M, Youssef A, Kanaan M, Berna P, Douadi Y, Garidi R, Dayen C. [Iatrogenic pulmonary necrosis due to hyperselective chemotherapy]. Rev Mal Respir 2011; 28:66-70. [PMID: 21277476 DOI: 10.1016/j.rmr.2010.04.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2009] [Accepted: 04/24/2010] [Indexed: 10/18/2022]
Abstract
BACKGROUND The management of cancer requires regular access to the central venous system. We report here, a case of a central venous access system causing pulmonary necrosis and abscess. CASE REPORT A 48 year old woman with a past history of B-cell lymphoma presented with a relapse of her disease. A subcutaneous central venous access port was placed in the right brachiocephalic area with puncture of the subclavian vein. She received three doses of chemotherapy. Eight days later, she consulted the emergency department on account of right-sided chest pain. Examination revealed a right-sided pleural effusion. The chest x-ray showed the tip of the catheter at the right pulmonary hilum. A CT scan confirmed that the tip of the central venous catheter was located in a branch of the right lower lobe pulmonary artery and was surrounded by consolidation in the right middle and lower lobes. The progress was marked by the development of a lung abscess despite removal of the central venous access system. Subsequent surgery led to satisfactory resolution. CONCLUSION We report a dramatic case that reminds us that placement of a central venous access system requires a sound technique and regular radiological surveillance.
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Oros A, Houtman MJ, Neco P, Gomez AM, Rajamani S, Oosterhoff P, Attevelt NJ, Beekman JD, van der Heyden MAG, Ver Donck L, Belardinelli L, Richard S, Antoons G, Vos MA. Robust anti-arrhythmic efficacy of verapamil and flunarizine against dofetilide-induced TdP arrhythmias is based upon a shared and a different mode of action. Br J Pharmacol 2010; 161:162-75. [PMID: 20718748 DOI: 10.1111/j.1476-5381.2010.00883.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND AND PURPOSE The high predisposition to Torsade de Pointes (TdP) in dogs with chronic AV-block (CAVB) is well documented. The anti-arrhythmic efficacy and mode of action of Ca(2+) channel antagonists, flunarizine and verapamil against TdP were investigated. EXPERIMENTAL APPROACH Mongrel dogs with CAVB were selected based on the inducibility of TdP with dofetilide. The effects of flunarizine and verapamil were assessed after TdP and in different experiments to prevent dofetilide-induced TdP. Electrocardiogram and ventricular monophasic action potentials were recorded. Electrophysiological parameters and short-term variability of repolarization (STV) were determined. In vitro, flunarizine and verapamil were added to determine their effect on (i) dofetilide-induced early after depolarizations (EADs) in canine ventricular myocytes (VM); (ii) diastolic Ca(2+) sparks in RyR2(R4496+/+) mouse myocytes; and (iii) peak and late I(Na) in SCN5A-HEK 293 cells. KEY RESULTS Dofetilide increased STV prior to TdP and in VM prior to EADs. Both flunarizine and verapamil completely suppressed TdP and reversed STV to baseline values. Complete prevention of TdP was achieved with both drugs, accompanied by the prevention of an increase in STV. Suppression of EADs was confirmed after flunarizine. Only flunarizine blocked late I(Na). Ca(2+) sparks were reduced with verapamil. CONCLUSIONS AND IMPLICATIONS Robust anti-arrhythmic efficacy was seen with both Ca(2+) channel antagonists. Their divergent electrophysiological actions may be related to different additional effects of the two drugs.
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Youl E, Bardy G, Magous R, Cros G, Sejalon F, Virsolvy A, Richard S, Quignard JF, Gross R, Petit P, Bataille D, Oiry C. Quercetin potentiates insulin secretion and protects INS-1 pancreatic β-cells against oxidative damage via the ERK1/2 pathway. Br J Pharmacol 2010; 161:799-814. [PMID: 20860660 DOI: 10.1111/j.1476-5381.2010.00910.x] [Citation(s) in RCA: 166] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND AND PURPOSE Quercetin lowers plasma glucose, normalizes glucose tolerance tests and preserves pancreatic β-cell integrity in diabetic rats. However, its mechanism of action has never been explored in insulin-secreting β-cells. Using the INS-1 β-cell line, the effects of quercetin were determined on glucose- or glibenclamide-induced insulin secretion and on β-cell dysfunctions induced by hydrogen peroxide (H(2)O(2)). These effects were analysed along with the activation of the extracellular signal-regulated kinase (ERK)1/2 pathway. N-acetyl-L-cysteine (NAC) and resveratrol, two antioxidants also known to exhibit some anti-diabetic properties, were used for comparison. EXPERIMENTAL APPROACH Insulin release was quantified by the homogeneous time resolved fluorescence method and ERK1/2 activation tested by Western blot experiments. Cell viability was estimated by the [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide] (MTT) colorimetric assay. KEY RESULTS Quercetin (20 µmol·L(-1)) potentiated both glucose (8.3 mmol·L(-1))- and glibenclamide (0.01 µmol·L(-1))-induced insulin secretion and ERK1/2 phosphorylation. The ERK1/2 (but not the protein kinase A) signalling pathway played a crucial role in the potentiation of glucose-induced insulin secretion by quercetin. In addition, quercetin (20 µmol·L(-1)), protected β-cell function and viability against oxidative damage induced by 50 µmol·L(-1) H(2)O(2) and induced a major phosphorylation of ERK1/2. In the same conditions, resveratrol or NAC were ineffective. CONCLUSION AND IMPLICATIONS Quercetin potentiated glucose and glibenclamide-induced insulin secretion and protected β-cells against oxidative damage. Our study suggested that ERK1/2 played a major role in those effects. The potential of quercetin in preventing β-cell dysfunction associated with diabetes deserves further investigation.
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Farah C, Meyer G, André L, Boissière J, Gayrard S, Cazorla O, Richard S, Boucher F, Tanguy S, Obert P, Reboul C. Moderate exercise prevents impaired Ca2+ handling in heart of CO-exposed rat: implication for sensitivity to ischemia-reperfusion. Am J Physiol Heart Circ Physiol 2010; 299:H2076-81. [DOI: 10.1152/ajpheart.00835.2010] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sustained urban carbon monoxide (CO) exposure exacerbates heart vulnerability to ischemia-reperfusion via deleterious effects on the antioxidant status and Ca2+ homeostasis of cardiomyocytes. The aim of this work was to evaluate whether moderate exercise training prevents these effects. Wistar rats were randomly assigned to a control group and to CO groups, living during 4 wk in simulated urban CO pollution (30–100 parts/million, 12 h/day) with (CO-Ex) or sedentary without exercise (CO-Sed). The exercise procedure began 4 wk before CO exposure and was maintained twice a week in standard filtered air during CO exposure. On one set of rats, myocardial ischemia (30 min) and reperfusion (120 min) were performed on isolated perfused rat hearts. On another set of rats, myocardial antioxidant status and Ca2+ handling were evaluated following environmental exposure. As a result, exercise training prevented CO-induced myocardial phenotypical changes. Indeed, exercise induced myocardial antioxidant status recovery in CO-exposed rats, which is accompanied by a normalization of sarco(endo)plasmic reticulum Ca2+-ATPase 2a expression and then of Ca2+ handling. Importantly, in CO-exposed rats, the normalization of cardiomyocyte phenotype with moderate exercise was associated with a restored sensitivity of the myocardium to ischemia-reperfusion. Indeed, CO-Ex rats presented a lower infarct size and a significant decrease of reperfusion arrhythmias compared with their sedentary counterparts. To conclude, moderate exercise, by preventing CO-induced Ca2+ handling and myocardial antioxidant status alterations, reduces heart vulnerability to ischemia-reperfusion.
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Marque M, Gardie B, Bressac de Paillerets B, Rustin P, Guillot B, Richard S, Bessis D. Novel FH
mutation in a patient with cutaneous leiomyomatosis associated with cutis verticis gyrata, eruptive collagenoma and Charcot-Marie-Tooth disease. Br J Dermatol 2010; 163:1337-9. [DOI: 10.1111/j.1365-2133.2010.09912.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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120
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Richard S, Perrin J, Baillot PA, Lacour JC, Ducrocq X. Ischaemic stroke and essential thrombocythemia: a series of 14 cases. Eur J Neurol 2010; 18:995-8. [PMID: 20722707 DOI: 10.1111/j.1468-1331.2010.03183.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Essential thrombocythemia (ET) is considered as a rare cause of stroke, partially because of difficulties to identify it when platelet count is not greatly elevated. However, early detection of ET is important because, without adapted treatment, recurrent thromboses are frequent. METHOD We collected, retrospectively, data from 14 cases of stroke patients with ET. Clinical characteristics, ischaemic stroke, laboratory data (platelet and leucocyte count, haemoglobin, JAK2 V617F mutation, culture of haematopoietic progenitors) and treatment were reviewed. Every patient has been interviewed by phone to evaluate outcome. RESULTS The population consisted of nine women and five men with ages ranging from 40 to 87 years. Most of the patients (12) had atherosclerotic risk factors and two presented a thrombus in the internal carotid. ET was diagnosed early after the onset of stroke except in two patients. The platelet count was under 600*10(9) /L for five patients. Mutation JAK2 V617F was found for eight patients. Thirteen patients were treated with an association between antiplatelet and cytoreductive treatment and did not present further thrombosis. Median follow-up is 2.8 years. CONCLUSION These cases emphasize the problems of diagnosing ET at the onset of the stroke. Complete blood count has to be carefully read and ET can be suspected even if platelet count is not greatly increased. Diagnosis must be confirmed by haematologist to initiate appropriate treatment.
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Peidis P, Papadakis AI, Muaddi H, Richard S, Koromilas AE. Doxorubicin bypasses the cytoprotective effects of eIF2α phosphorylation and promotes PKR-mediated cell death. Cell Death Differ 2010; 18:145-54. [PMID: 20559319 DOI: 10.1038/cdd.2010.76] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The eukaryotic cell responds to various forms of environmental stress by adjusting the rates of mRNA translation thus facilitating adaptation to the assaulting stress. One of the major pathways that control protein synthesis involves the phosphorylation of the α-subunit of eukaryotic initiation factor eIF2 at serine 51. Different forms of DNA damage were shown to induce eIF2α phosphorylation by using PERK, GCN2 or PKR. However, the specificity of the eIF2α kinases and the biological role of eIF2α phosphorylation pathway in the DNA damage response (DDR) induced by chemotherapeutics are not known. Herein, we show that PKR is the eIF2α kinase that responds to DDR induced by doxorubicin. We show that activation of PKR integrates two signaling pathways with opposing biological outcomes. More specifically, induction of eIF2α phosphorylation has a cytoprotective role, whereas activation of c-jun N-terminal kinase (JNK) by PKR promotes cell death in response to doxorubicin. We further show that the proapoptotic effects of JNK activation prevail over the cytoprotection mediated by eIF2α phosphorylation. These findings reveal that PKR can be an important inducer of cell death in response to chemotherapies through its ability to act independently of eIF2α phosphorylation.
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Richard S, Dayen C, Vanelslander P, Garidi R, Youssef A, Bouketouche M, Bouguerouche Y, Douadi Y, Damaj G, Kanaan M. A case of gastric perforation related to sunitinib after radiotherapy of spine in a patient with metastatic renal cell carcinoma. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e13141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Kreutziger J, Frankenberger B, Luger T, Richard S, Zbinden S. Urinary retention after spinal anaesthesia with hyperbaric prilocaine 2% in an ambulatory setting. Br J Anaesth 2010; 104:582-6. [DOI: 10.1093/bja/aeq054] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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124
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Pierre S, Coupé S, Prévot-d'Alvise N, Gaillard S, Richard S, Gouze E, Aubert J, Grillasca J. Cloning of Wap65 in sea bass (Dicentrarchus labrax) and sea bream (Sparus aurata) and expression in sea bass tissues. Comp Biochem Physiol B Biochem Mol Biol 2010; 155:396-402. [DOI: 10.1016/j.cbpb.2010.01.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2009] [Revised: 01/06/2010] [Accepted: 01/07/2010] [Indexed: 10/20/2022]
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125
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Meyer G, André L, Tanguy S, Boissiere J, Farah C, Lopez-Lauri F, Gayrard S, Richard S, Boucher F, Cazorla O, Obert P, Reboul C. Simulated urban carbon monoxide air pollution exacerbates rat heart ischemia-reperfusion injury. Am J Physiol Heart Circ Physiol 2010; 298:H1445-53. [PMID: 20207812 DOI: 10.1152/ajpheart.01194.2009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Myocardial damages due to ischemia-reperfusion (I/R) are recognized to be the result of a complex interplay between genetic and environmental factors. Epidemiological studies suggested that, among environmental factors, carbon monoxide (CO) urban pollution can be linked to cardiac diseases and mortality. The aim of this work was to evaluate the impact of exposure to CO pollution on cardiac sensitivity to I/R. Regional myocardial I/R was performed on isolated perfused hearts from rats exposed for 4 wk to air enriched with CO (30-100 ppm). Functional variables, reperfusion ventricular arrhythmias (VA) and cellular damages (infarct size, lactate dehydrogenase release) were assessed. Sarcomere length shortening and Ca(2+) handling were evaluated in intact isolated cardiomyocytes during a cellular anoxia-reoxygenation protocol. The major results show that prolonged CO exposure worsens myocardial I/R injuries, resulting in increased severity of postischemic VA, impaired recovery of myocardial function, and increased infarct size (60 +/- 5 vs. 33 +/- 2% of ischemic zone). The aggravating effects of CO exposure on I/R could be explained by a reduced myocardial enzymatic antioxidant status (superoxide dismutase -45%; glutathione peroxidase -49%) associated with impaired intracellular Ca(2+) handling. In conclusion, our results are consistent with the idea that chronic CO pollution dramatically increases the severity of myocardial I/R injuries.
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