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Guibert-broudic M, Dubergé T, Autret A, Carrier P, Salem N, Walz J, Brenot-Rossi I, Gravis G. Multi-institutional evaluation of therapeutic management for oligometastatic cancer prostate recurrence with choline-PET/CT. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz248.024] [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: 11/13/2022] Open
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Maurel P, Loustaud-Ratti V, Carrier P, Marie E, Rousseau A, Debette-Gratien M, Silvain C, Causse X, Barbier L, Prémaud A, Salamé E. Effect of longitudinal exposure to tacrolimus on chronic kidney disease occurrence at one year post liver transplantation. J Hepatol 2018. [DOI: 10.1016/s0168-8278(18)30269-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/26/2023]
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Jamilloux Y, Sarabi M, Kérever S, Boussely N, le Sidaner A, Valgueblasse V, Carrier P, Loustaud-Ratti V, Sautereau D, Fauchais AL, François B, Vidal E, Collaborators. Adherence to online monitoring of patient-reported outcomes by patients with chronic inflammatory diseases: a feasibility study. Lupus 2015; 24:1429-36. [DOI: 10.1177/0961203315585814] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 04/09/2015] [Indexed: 12/11/2022]
Abstract
Objectives The objective of this report is to investigate the feasibility of collecting patient-reported outcomes (PROs) via e-questionnaires delivered to patients with chronic inflammatory diseases (CIDs). Methods Consecutive outpatients with a confirmed diagnosis of systemic lupus erythematosus, primary Sjögren’s syndrome or inflammatory bowel disease were followed at two medical departments. Patients received monthly e-mails containing the SF36, Hospital Anxiety and Depression scale and an analogue symptom scale over a six-month period. Participation rate, socio-demographic characteristics and patients’ satisfaction were analysed. Results A total of 128 patients were included (79% female; mean age: 42 ± 12 years). Eighty-two per cent of questionnaires were returned. The monthly participation rate ranged from 89% to 77%, with a six-month attrition rate of 13%. The mean completion rate of questionnaires was 98%. Factors significantly associated with increased answer rate were: married/couple status, greater number of children at home and previous participation in online surveys. The main reasons for non-response were: ‘too busy to participate’ (35%) and ‘away from home Internet access’ (31%). Overall, 68% of the participants found the study convenient and 96% agreed to continue at a monthly or bimonthly frequency. Conclusion Online home self-assessment of PROs was feasible in the setting of CIDs. Patients were satisfied and willing to continue the survey. The Internet allows immediate and sophisticated presentation of PROs to clinicians. Future studies are warranted to determine how PRO monitoring may contribute to routine care in CIDs and other diseases.
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Affiliation(s)
- Y Jamilloux
- Department of Internal Medicine, Hôpital de la Croix-Rousse, University Claude Bernard, Lyon, France
- Department of Internal Medicine, University Hospital Dupuytren, University of Limoges, Limoges, France
| | - M Sarabi
- Department of Hepatogastroenterology, University Hospital Dupuytren, University of Limoges, Limoges, France
- Department of Medical Oncology, Centre Léon Bérard, Lyon, France
| | - S Kérever
- ECSTRA Team, Epidemiology and Biostatistics, Sorbonne Paris Cité Research Centre UMR 1153, INSERM, Paris, France
| | - N Boussely
- Department of Internal Medicine, University Hospital Dupuytren, University of Limoges, Limoges, France
| | - A le Sidaner
- Department of Hepatogastroenterology, University Hospital Dupuytren, University of Limoges, Limoges, France
| | - V Valgueblasse
- Department of Hepatogastroenterology, University Hospital Dupuytren, University of Limoges, Limoges, France
| | - P Carrier
- Department of Hepatogastroenterology, University Hospital Dupuytren, University of Limoges, Limoges, France
| | - V Loustaud-Ratti
- Department of Hepatogastroenterology, University Hospital Dupuytren, University of Limoges, Limoges, France
| | - D Sautereau
- Department of Hepatogastroenterology, University Hospital Dupuytren, University of Limoges, Limoges, France
| | - A-L Fauchais
- Department of Internal Medicine, University Hospital Dupuytren, University of Limoges, Limoges, France
| | - B François
- Intensive Care Unit and CIC P801, University Hospital Dupuytren, University of Limoges, Limoges, France
| | - E Vidal
- Department of Internal Medicine, University Hospital Dupuytren, University of Limoges, Limoges, France
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Carrier P, Chambaraud T, Vong C, Guillaudeau A, Debette-Gratien M, Jacques J, Legros R, Sautereau D, Essig M, Loustaud-Ratti V. Severe renal impairment during triple therapy with telaprevir. Clin Res Hepatol Gastroenterol 2014; 38:e69-71. [PMID: 24461554 DOI: 10.1016/j.clinre.2013.12.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 12/10/2013] [Accepted: 12/17/2013] [Indexed: 02/06/2023]
Affiliation(s)
- P Carrier
- Service d'hépato-gastroentérologie, CHU de Limoges, 2, avenue Martin-Luther-King, 87042 Limoges, France.
| | - T Chambaraud
- Service de néphrologie, CHU de Limoges, 2, avenue Martin-Luther-King, 87042 Limoges, France
| | - C Vong
- Inserm UMR 850, faculté de médecine de Limoges, université de Limoges, Limoges, France
| | - A Guillaudeau
- Service d'anatomopathologie, CHU de Limoges, 2, avenue Martin-Luther-King, 87042 Limoges, France
| | - M Debette-Gratien
- Service d'hépato-gastroentérologie, CHU de Limoges, 2, avenue Martin-Luther-King, 87042 Limoges, France
| | - J Jacques
- Service d'hépato-gastroentérologie, CHU de Limoges, 2, avenue Martin-Luther-King, 87042 Limoges, France
| | - R Legros
- Service d'hépato-gastroentérologie, CHU de Limoges, 2, avenue Martin-Luther-King, 87042 Limoges, France
| | - D Sautereau
- Service d'hépato-gastroentérologie, CHU de Limoges, 2, avenue Martin-Luther-King, 87042 Limoges, France
| | - M Essig
- Service de néphrologie, CHU de Limoges, 2, avenue Martin-Luther-King, 87042 Limoges, France; Inserm UMR 850, faculté de médecine de Limoges, université de Limoges, Limoges, France
| | - V Loustaud-Ratti
- Service d'hépato-gastroentérologie, CHU de Limoges, 2, avenue Martin-Luther-King, 87042 Limoges, France; Inserm UMR 1092, faculté de médecine de Limoges, université de Limoges, Limoges, France
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Loustaud-Ratti V, Wagner A, Carrier P, Marczuk V, Chemin I, Lunel F, Fouchard-Hubert I, Ahmed SS, Abergel A, Rousseau A, Lefebvre A, Debette-Gratien M, Denis F, Alain S. Distribution of total DNA and cccDNA in serum and PBMCs may reflect the HBV immune status in HBsAg+ and HBsAg- patients coinfected or not with HIV or HCV. Clin Res Hepatol Gastroenterol 2013; 37:373-83. [PMID: 23477988 DOI: 10.1016/j.clinre.2012.11.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 10/07/2012] [Accepted: 11/06/2012] [Indexed: 02/04/2023]
Abstract
BACKGROUND The potential reservoir role of serum and peripheral blood mononuclear cells (PBMCs) for total HBV DNA (tDNA) and cccDNA still remains unknown. MATERIAL AND METHODS We analyzed tDNA and cccDNA with a single sensitive and validated standardized real-time PCR method in serum and PBMCs in two populations of chronic HBV infection coinfected or not with HCV and/or HIV viruses: a retrospective cohort of 130 HBsAg-negative (HBsAg-) patients with "anti-HBc alone" or anti-HBc and anti-HBs antibodies (Ab) and a cohort of 70 HBsAg-positive patients, 16 of them being prospectively followed under treatment. RESULTS Among HBsAg- patients, HBV DNA was detected in serum or PBMCs in about half of the cases with various distributions of tDNA and cccDNA: in HIV-negative patients with an "antiHBc alone" profile, tDNA was mostly detected in PBMCs suggesting a possible active role of PBMCs; although cccDNA was not detected in PBMCs in HIV-positive patients, tDNA and cccDNA were mostly observed in serum, suggesting a specific pattern of more "persistent" than "occult" infection in this population. Patients with anti-HBc and anti-HBs Ab harbored tDNA in serum or in PBMCs, regardless of their HIV or HCV status, raising the question of a viral reactivation risk during immunosupression in these patients. Among HBsAg+ patients, tDNA was detected in serum and PBMCs of 88.5% of the cases and cccDNA in 22%. Levels of tDNA in both compartments were highly correlated during treatment, suggesting a passive reservoir role for PBMCs. CONCLUSION The respective distribution of tDNA and cccDNA in serum and PBMCs may reflect the different immune statuses of the host in HBsAg+ and HBsAg- patients. The frequency of HBV DNA in PBMCs from AgHBs- patients suggests a viral reactivation risk during immunodepression in those patients.
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Affiliation(s)
- V Loustaud-Ratti
- Inserm UMR 1092, Faculté de médecine, Université Limoges, 2, rue du Docteur-Marcland, 87025 Limoges cedex, France
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Carrier P, Godet B, Crepin S, Magy L, Debette-Gratien M, Pillegand B, Jacques J, Sautereau D, Vidal E, Labrousse F, Gondran G, Loustaud-Ratti V. Acute liver toxicity due to methylprednisolone: consider this diagnosis in the context of autoimmunity. Clin Res Hepatol Gastroenterol 2013; 37:100-4. [PMID: 23318289 DOI: 10.1016/j.clinre.2012.10.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 10/07/2012] [Accepted: 10/17/2012] [Indexed: 02/04/2023]
Abstract
The occurrence of corticosteroid-induced hepatitis is a rare event that has been recently described in the literature. We report the case of an acute cytolytic hepatitis in a patient treated with methylprednisolone for multiple sclerosis associated with an autoimmune thyroid dysfunction. After ruling out other etiologies, we concluded that the acute liver injury was due to steroids, and we analyzed the specific circumstances in the literature where methylprednisolone may have been responsible for acute hepatitis.
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Affiliation(s)
- P Carrier
- Service d'hépato-gastroentérologie, CHU de Limoges, 2, avenue Martin-Luther-King, 87042 Limoges, France.
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Carrier P, Legros R, Le Sidaner A, Morel A, Harry P, Moesch C, Sautereau D, Ly KH, Loustaud-Ratti V. [Lead poisoning by fishing sinker ingestion]. Rev Med Interne 2012; 33:697-9. [PMID: 23067867 DOI: 10.1016/j.revmed.2012.09.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 07/22/2012] [Accepted: 09/09/2012] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Lead colic is a rare cause of abdominal pain. The diagnosis of lead poisoning is most often mentioned in at risk populations (children, psychotic patients). CASE REPORT We report a 21-year-old man who presented with colicky abdominal pain. Abdominal plain radiograph showed multiple intracolonic metallic bodies. Markedly elevated lead and zinc protoporphyrin serum levels confirmed the diagnosis of lead poisoning. The patient reported that he commonly chewed fishing lead sinker and may sometimes swallow them during the preparation of fishing rod. Clinical outcome was favourable with chelation therapy. CONCLUSION Lead poisoning following fishing sinker ingestion is very uncommon. Diagnosis may be discussed in the presence of foreign metallic bodies on plain abdominal radiograph and confirmed by high serum level of lead. A prompt treatment with chelation therapy and digestive emptying is usually effective.
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Affiliation(s)
- P Carrier
- Service d'hépato-gastroentérologie, centre hospitalier universitaire Dupuytren, 2, avenue Martin-Luther-King, 87042 Limoges, France.
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Carrier P, Legros R, Morel A, Le Sidaner A, Bouygues A, Valgueblasse V, Gondran G, Moesch C, Tabouret T, Bézanahary H, Ly K, Loustaud-Ratti V. À la pêche aux plombs. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.10.122] [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: 10/15/2022]
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Lockwood DJ, Dharma-wardana MWC, Lu ZH, Grozea DH, Carrier P, Lewis LJ. Photoluminescence within Crystalline-Si/SiO2 Single Quantum Wells. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-737-f1.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTUltrathin single quantum wells of crystalline silicon (c-Si) confined by SiO2 have been prepared by chemical and thermal processing of silicon-on-insulator wafers. The photoluminescence (PL) produced by these nanometer-thick single wells contains two bands: one exhibits a peak energy of ∼1.8 eV, while the second increases rapidly in peak energy with decreasing c-Si layer thickness. Comparison with theories based on self-consistent first-principles calculations shows that the increase in PL peak energy of the second band is consistent with that predicted for the c-Si energy gap of such wells. It also agrees with the measured band gap variation. The ∼1.8 eV PL band is attributed to the recombination of electron-hole pairs confined at the c-Si/SiO2 interface.
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Lapébie F, Fauchais A, Ly K, Bézanahary H, Gondran G, Carrier P, Palat S, Liozon E, Loustaud-Ratti V, Vidal-Cathala E. Syndrome d’hyper-IgM associé à un lymphome malin non hodgkinien révélé par un pseudo lupus avec vascularite cryoglobulinémique. Rev Med Interne 2010. [DOI: 10.1016/j.revmed.2010.03.168] [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]
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Chevalier N, Carrier P, Piche M, Chevallier A, Wagner K, Tardy V, Benchimol D, Fénichel P. Adrenocortical incidentaloma with uncertain prognosis associated with an inadequately treated congenital adrenal hyperplasia. Annales d'Endocrinologie 2010; 71:56-9. [DOI: 10.1016/j.ando.2009.10.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Revised: 04/16/2009] [Accepted: 10/12/2009] [Indexed: 11/30/2022]
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Thariat J, Hamoir M, Janot F, De Mones E, Marcy PY, Carrier P, Bozec A, Guevara N, Albert S, Vedrine PO, Graff P, Peyrade F, Hofman P, Santini J, Bourhis J, Lapeyre M. [Neck dissection following chemoradiation for node positive head and neck carcinomas]. Cancer Radiother 2009; 13:758-70. [PMID: 19692283 DOI: 10.1016/j.canrad.2009.05.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 04/14/2009] [Accepted: 05/02/2009] [Indexed: 11/19/2022]
Abstract
The optimal timing and extent of neck dissection in the context of chemoradiation for head and neck cancer remains controversial. For some institutions, it is uncertain whether neck dissection should still be performed upfront especially for cystic nodes. For others, neck dissection can be performed after chemoradiation and can be omitted for N1 disease as long as a complete response to chemoradiation is obtained. The question is debated for N2 and N3 disease even after a complete response as the correlation between radiological and clinical assessment and pathology may not be reliable. Response rates are greater than or equal to 60% and isolated neck failures are less than or equal to 10% with current chemoradiation protocols. Some therefore consider that systematic upfront or planned neck dissection would lead to greater than or equal to 50% unnecessary neck dissections for N2-N3 disease. Positron-emission tomography (PET) scanning to assess treatment response and have shown a very high negative predictive value of greater than or equal to 95% when using a standard uptake value of 3 for patients with a negative PET at four months after the completion of therapy. These data may support the practice of observing PET-negative necks. More evidence-based data are awaited to assess the need for neck dissection on PET. Selective neck dissection based on radiological assessment and peroperative findings and not exclusively on initial nodal stage may help to limit morbidity and to improve the quality of life without increasing the risk of neck failure. Adjuvant regional radiation boosts might be discussed on an individual basis for aggressive residual nodal disease with extracapsular spread and uncertain margins but evidence is missing. Medical treatments aiming at reducing the metastatic risk especially for N3 disease are to be evaluated.
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Affiliation(s)
- J Thariat
- Département de radiothérapie, oncologie, centre de lutte contre le cancer Antoine-Lacassagne, 33 avenue Valombrose, Nice cedex 2, France.
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Larouche D, Lavoie A, Proulx S, Paquet C, Carrier P, Beauparlant A, Auger F, Germain L. La médecine régénératrice : les cellules souches, les interactions cellulaires et matricielles dans la reconstruction cutanée et cornéenne par génie tissulaire. ACTA ACUST UNITED AC 2009; 57:299-308. [DOI: 10.1016/j.patbio.2008.04.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2008] [Accepted: 04/16/2008] [Indexed: 12/22/2022]
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Pichon N, Mathonnet M, Verdière F, Carrier P. [Splenic trauma: an unusual complication of colonoscopy with polypectomy]. ACTA ACUST UNITED AC 2008; 32:123-7. [PMID: 18387425 DOI: 10.1016/j.gcb.2007.10.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2007] [Accepted: 10/04/2007] [Indexed: 11/18/2022]
Abstract
Nowadays, colonoscopy has become an invaluable tool in the diagnosis and treatment of diseases of the colon and rectum. Colonoscopy is still an invasive exam with several complications. The most common complications are perforation and bleeding, which occur in up to 1% after diagnostic colonoscopy and 3% of patients undergoing therapeutic colonoscopy. Less common complications include pneumothorax, pneumomediastinum, colonic volvulus, hernia incarceration, retroperitoneal abscess and mesenteric tear. Splenic rupture is a rare and potentially lethal colonoscopic complication with less than 45 cases reported in the world. The overall incidence is 0.004%. Mechanisms of injury and available treatment options remain discussed. We present a case of splenic rupture after colonoscopy with polypectomy in a 73-year-old woman managed first with nonoperative treatment and nine days later with surgical treatment. As the indications for colonoscopy expand, including the introduction of mass screening for colorectal cancer, endoscopists should be increasingly aware of that life-threatening complication after colonoscopy and know the emergency treatment.
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Affiliation(s)
- N Pichon
- Service de réanimation polyvalente, centre hospitalier universitaire Dupuytren, 2, avenue Martin-Luther-King, 87042 Limoges cedex, France.
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Picault N, Cazalé AC, Beyly A, Cuiné S, Carrier P, Luu DT, Forestier C, Peltier G. Chloroplast targeting of phytochelatin synthase in Arabidopsis: effects on heavy metal tolerance and accumulation. Biochimie 2006; 88:1743-50. [PMID: 16766112 DOI: 10.1016/j.biochi.2006.04.016] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2006] [Accepted: 04/21/2006] [Indexed: 11/26/2022]
Abstract
The enzymatically synthesized thiol peptide phytochelatin (PC) plays a central role in heavy metal tolerance and detoxification in plants. In response to heavy metal exposure, the constitutively expressed phytochelatin synthase enzyme (PCS) is activated leading to synthesis of PCs in the cytosol. Recent attempts to increase plant metal accumulation and tolerance reported that PCS over-expression in transgenic plants paradoxically induced cadmium hypersensitivity. In the present paper, we investigate the possibility of synthesizing PCs in plastids by over-expressing a plastid targeted phytochelatin synthase (PCS). Plastids represent a relatively important cellular volume and offer the advantage of containing glutathione, the precursor of PC synthesis. Using a constitutive CaMV 35S promoter and a RbcS transit peptide, we successfully addressed AtPCS1 to chloroplasts, significant PCS activity being measured in this compartment in two independent transgenic lines. A substantial increase in the PC content and a decrease in the glutathione pool were observed in response to cadmium exposure, when compared to wild-type plants. While over-expressing AtPCS1 in the cytosol importantly decreased cadmium tolerance, both cadmium tolerance and accumulation of plants expressing plastidial AtPCS1 were not significantly affected compared to wild-type. Interestingly, targeting AtPCS1 to chloroplasts induced a marked sensitivity to arsenic while plants over-expressing AtPCS1 in the cytoplasm were more tolerant to this metalloid. These results are discussed in relation to heavy metal trafficking pathways in higher plants and to the interest of using plastid expression of PCS for biotechnological applications.
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Affiliation(s)
- N Picault
- CEA Cadarache, DSV, DEVM, laboratoire d'écophysiologie de la photosynthèse, UMR 6191 CNRS-CEA, Aix Marseille II, 13108 Saint-Paul-lez-Durance, France
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Balu-Maestro C, Chapellier C, Carrier P, Darcourt J, Ettore F, Raoust I. Imagerie dans le bilan d’extension ganglionnaire et métastatique du cancer du sein. ACTA ACUST UNITED AC 2005; 86:1649-57. [PMID: 16269978 DOI: 10.1016/s0221-0363(05)81506-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [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: 02/05/2023]
Abstract
Disease staging of patients with breast cancer is based on the probability of metastatic disease, the reliability of complementary examinations, and therapeutic possibilities, evaluated on a cost/benefit basis. For regional disease staging, nodal status can be assessed by ultrasound, and the value of this approach can be optimized by imaging-guided biopsies. Ultrasound examination of nodes upstream of the sentinel node allows determination of the utility of this node and the indications for axillary resection. Work-up of metastatic spread is performed only after evaluation of risk factors for metastasis. Prior to therapy, and in the absence of any clinical warning signs for resectable tumors, there are no indications for imaging, which is reserved solely for locally advanced tumors.
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Béliveau A, Bérubé M, Carrier P, Mercier C, Guérin SL. Tumorigenicity of the mixed spindle-epithelioid SP6.5 and epithelioid TP17 uveal melanoma cell lines is differentially related to alpha5beta1 integrin expression. Invest Ophthalmol Vis Sci 2001; 42:3058-65. [PMID: 11687555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023] Open
Abstract
PURPOSE It has been suggested that the epithelioid morphology and high aggressiveness that is typical of the uveal melanoma cell line TP17 is dependent on the loss of alpha5beta1 integrin expression at the cell surface. The purpose of the current study was to test this hypothesis in the TP17 cell line and investigate the role this integrin may play in the tumorigenicity of the SP6.5 cells, a mixed spindle-epithelioid culture-type human uveal melanoma that shows tumorigenic properties clearly distinct from that of TP17 cells. METHODS Expression of the alpha5 integrin subunit was restored in the alpha5-TP17 cell line by stably transfecting the cells with a recombinant plasmid encoding the integrin subunit. Flow cytometry and adhesion assays on fibronectin (FN)-coated culture plates were used to monitor alpha5 expression in the cells. The effect of alpha5 expression on both tumorigenicity and cell proliferation was evaluated in vivo in nude mice. In vitro growth properties of the alpha5(+) TP17 cells was evaluated by cell counting and compared with that of the alpha5 parental TP17 cell line. The influence exerted by the alpha5 integrin subunit on the tumorigenic and proliferative properties of the SP6.5 cells was evaluated in vivo in nude mice by exposing the cells to increasing doses of a blocking antibody directed against the alpha5-subunit before subcutaneous injection, and compared with the results obtained with untreated SP6.5 cells. RESULTS Expression of the alpha5 integrin subunit in the alpha5-TP17 cells was successfully achieved, as evidenced by both flow cytometry and adhesion assays on FN-coated culture plates. Restoring expression of alpha5 in TP17 cells enhanced epithelioid cell morphology and increased the growth properties of this cell line in vivo. The ability of the SP6.5 cells to yield subcutaneous tumors was found to be concentration dependent and was reduced in a dose-dependent manner when the cells were exposed to the anti-alpha5 blocking antibody. CONCLUSIONS Restoring expression of alpha5 in the alpha5-negative TP17 uveal melanoma cell line influenced the proliferative properties of these cells but did not alter its tumorigenic potential. In contrast, the ability of the SP6.5 cells to yield tumors in vivo in nude mice appeared to be related to expression of this integrin.
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Affiliation(s)
- A Béliveau
- Oncology and Molecular Endocrinology Research Center, Centre Hospitalier Universitaire de Québec and Laval University, Ste-Foy, Québec, Canada
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Baryla A, Carrier P, Franck F, Coulomb C, Sahut C, Havaux M. Leaf chlorosis in oilseed rape plants (Brassica napus) grown on cadmium-polluted soil: causes and consequences for photosynthesis and growth. Planta 2001; 212:696-709. [PMID: 11346943 DOI: 10.1007/s004250000439] [Citation(s) in RCA: 136] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Brassica napus L. (oilseed rape) was grown from seeds on a reconstituted soil contaminated with cadmium (100 mg Cd kg-1 dry soil), resulting in a marked chlorosis of the leaves which was investigated using a combination of biochemical, biophysical and physiological methods. Spectroscopic and chromatographic analyses of the photosynthetic pigments indicated that chlorosis was not due to a direct interaction of Cd with the chlorophyll biosynthesis pathway. In addition, mineral deficiency and oxidative stress were apparently not involved in the pigment loss. Leaf chlorosis was attributable to a marked decrease in the chloroplast density caused by a reduction in the number of chloroplasts per cell and a change in cell size, suggesting that Cd interfered with chloroplast replication and cell division. Relatively little Cd was found in the chloroplasts and the properties of the photosynthetic apparatus (electron transport, protein composition, chlorophyll antenna size, chloroplast ultrastructure) were not affected appreciably in plants grown on Cd-polluted soil. Depth profiling of photosynthetic pigments by phase-resolved photoacoustic spectroscopy revealed that the Cd-induced decrease in pigment content was very pronounced at the leaf surface (stomatal guard cells) compared to the leaf interior (mesophyll). This observation was consistent with light transmission and fluorescence microscopy analyses, which revealed that stomata density in the epidermis was noticeably reduced in Cd-exposed leaves. Concomitantly, the stomatal conductance estimated from gas-exchange measurements was strongly reduced with Cd. When plants were grown in a high-CO2 atmosphere (4,000 microliters CO2 l-1), the inhibitory effect of Cd on growth was not cancelled, suggesting that the reduced availability of CO2 at the chloroplast level associated with the low stomatal conductance was not the main component of Cd toxicity in oilseed rape.
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Affiliation(s)
- A Baryla
- CEA/Cadarache, DSV, DEVM, Laboratoire d'Ecophysiologie de la Photosynthèse, 13108 Saint-Paul-lez-Durance, France
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Abstract
Tissue engineering is progressing rapidly. Bioengineered substitutes are already available for experimental applications and some clinical purposes such as skin replacement. This review focuses on the development of reconstructed human cornea in vitro by tissue engineering. Key elements to consider in the corneal reconstruction, such as the source for epithelial cells and keratocytes, are discussed and the various steps of production are presented. Since one application of this human model is to obtain a better understanding of corneal wound healing, the mechanisms of this phenomenon as well as the function played both by membrane-bound integrins and components from the extracellular matrix have also been addressed. The analysis of integrins by immunohistofluorescence labelling of our reconstructed human cornea revealed that beta(1), alpha(3), alpha(5), and alpha(6) integrin subunits were expressed but alpha(4) was not. Laminin, type VII collagen and fibronectin were also detected. Finally, the future challenges of corneal reconstruction by tissue engineering are discussed and the tremendous applications of such tissue produced in vitro for experimental as well as clinical purposes are considered.
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Affiliation(s)
- L Germain
- Laboratoire d'Organogénèse Expérimentale (LOEX), CHA Pavillon Saint-Sacrement, Qc, G1 S 4L8, Québec, Canada.
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Zorin NA, Dimon B, Gagnon J, Gaillard J, Carrier P, Vignais PM. Inhibition by iodoacetamide and acetylene of the H-D-exchange reaction catalyzed by Thiocapsa roseopersicina hydrogenase. Eur J Biochem 1996; 241:675-81. [PMID: 8917471 DOI: 10.1111/j.1432-1033.1996.00675.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The kinetics of H-D isotope exchange catalyzed by the thermostable hydrogenase from Thiocapsa roseopersicina have been studied by analysis of the exchange between D2 and H2O. The pH dependence of the exchange reaction was examined between pH 2.5 and pH 11. Over the whole pH range, HD was produced at a higher initial velocity than H2, with a marked optimum at pH 5.5; a second peak in the pH profile was observed at around pH 8.5. The rapid formation of H2 with respect to HD in the D2/H2O system is consistent with a heterolytic cleavage of D2 into D+ and an enzyme hydride that can both exchange with the solvent. The H-D-exchange activity was lower in the H2/D2O system than in the D2/H2O system. The other reactions catalyzed by the hydrogenase, H2 oxidation and H2 evolution, are pH dependent; the optimal pH were 9.5 for H2 uptake and 4.0 for H2 production. Treatment of the active form of hydrogenase by iodoacetamide led to a slow and irreversible inhibition of the H-D exchange. When iodo[1-14C]acetamide was incubated with hydrogenase, the radioactive labeling of the large subunit was higher for the enzyme activated under H2 than for the inactive oxidized form. Cysteine residues were identified as the alkylated derivative by amino acid analysis. Acetylene, which inhibits H-D exchange and abolishes the Ni-C EPR signal, protected the enzyme from irreversible inhibition by iodoacetamide. These data indicate that iodoacetamide can reach the active site of the H2-activated hydrogenase from T. roseopersicina. This was not found to be the case with the seleno hydrogenase from Desulfovibrio baculatus (now Desulfomicrobium baculatus). Cysteine modification by iodoacetamide upon activation of the enzyme concomitant with loss of H-D exchange indicates that reductive activation makes at least one Cys residue of the active site available for alkylation.
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Affiliation(s)
- N A Zorin
- CEA/Grenoble, Laboratoire de Biochimie Microbienne (CNRS URA 1130 alliée à I'INSERM), Département de Biologie Moléculaire et Structurale, Grenoble, France
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Bladier C, Carrier P, Chagvardieff P. Light Stress and Oxidative Cell Damage in Photoautotrophic Cell Suspension of Euphorbia characias L. Plant Physiol 1994; 106:941-947. [PMID: 12232375 PMCID: PMC159616 DOI: 10.1104/pp.106.3.941] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A photoautotrophic cell-suspension culture of Euphorbia characias L. grown at 70 [mu]mol photons m-2 s-1 was very sensitive to light stress: the gross photosynthesis measured by using a mass spectrometric 16O2/18O2 isotope technique showed a fast decrease at a rather low light intensity of 100 [mu]mol photons m-2 s-1, far below the photosynthetic saturation level. The contribution of activated oxygen species on photosystem II photoinhibition was examined for a given light intensity. A protective effect on gross photosynthesis was observed with 1% oxygen. When light stress was applied to a methyl viologen-adapted cell suspension, photoinhibition was reduced. When 50 [mu]mol L-1 methyl viologen was added, photoinhibition was slightly enhanced. These responses suggested an involvement of superoxide radicals in the photoinhibition process of E. characias photoautotrophic cells. The long-term (16 h) effects of photoinhibition were then studied. Aldehyde (malondialdehyde and 4-hydroxyalcenals) production resulting from lipid peroxidation was stimulated in long-term stressed cells. When 50 [mu]mol L-1 methyl viologen were added, increased aldehyde production was measured. Under 1% oxygen, the aldehyde production was comparable to that of nonstressed cells. The relationship among lipid peroxidation, light intensity, and net photosynthesis suggests that aldehyde production may result from cell death provoked by a prolonged energy deficit due to the inhibition of photosynthesis.
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Affiliation(s)
- C. Bladier
- Commissariat a I'Energie Atomique, Departement de Physiologie Vegetale et Ecosystemes, Centre d'Etudes de Cadarache, 13108 St. Paul Iez Durance Cedex, France
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Cournac L, Dimon B, Carrier P, Lohou A, Chagvardieff P. Growth and Photosynthetic Characteristics of Solanum tuberosum Plantlets Cultivated in Vitro in Different Conditions of Aeration, Sucrose Supply, and CO(2) Enrichment. Plant Physiol 1991; 97:112-7. [PMID: 16668356 PMCID: PMC1080971 DOI: 10.1104/pp.97.1.112] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Growth characteristics, oxygen exchange, and carbohydrate and chlorophyll contents were determined 30 days after subculturing of single node-derived plantlets of Solanum tuberosum cv Haig cultivated in vitro. Cultivation conditions were: (a) photomixotrophy in closed vessel, (b) photomixotrophy in closed vessel on medium supplemented with silver thiosulfate, (c) photomixotrophy in aerated vessel, (d) photoautotrophy in air, (e) photoautotrophy in CO(2)-enriched air. In photomixotrophic conditions, aeration of the vessel enhanced sucrose utilization and had a positive effect on plantlet growth. In photoautotrophic conditions, growth of the plantlets was slow in air and was strongly enhanced by CO(2) enrichment of the atmosphere. Starch to sucrose ratios were higher in plants grown photoautotrophically than in plants grown with sucrose in the medium. Oxygen exchange characteristics on a chlorophyll basis were similar between the plantlets when measured under moderate light, and resembled those of greenhouse plant leaves. In high light, however, plantlets grown photoautotrophically in a CO(2)-enriched atmosphere had higher oxygen exchange rates. We concluded from these results that potato plantlets in vitro in conditions (c), (d), and (e) developed C3-plant photosynthetic characteristics, which were in photoautotrophically grown plantlets comparable to those of field-grown plants.
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Affiliation(s)
- L Cournac
- Département de Physiologie Végétale et Ecosystèmes, CEA Centre de Cadarache, 13108 Saint Paul Lez Durance, Cédex, France
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Carrier P, Chagvardieff P, Tapie P. Comparison of the Oxygen Exchange between Photosynthetic Cell Suspensions and Detached Leaves of Euphorbia characias L. Plant Physiol 1989; 91:1075-9. [PMID: 16667114 PMCID: PMC1062121 DOI: 10.1104/pp.91.3.1075] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Using a mass-spectrometric (16)O(2)/(18)O(2)-isotope technique, we compared the nature and the relative importance of oxygen exchange in photomixotrophic (PM) and photoautotrophic (PA) suspensions of Euphorbia characias L. with those in intact leaves of the same species. Young and mature leaves, dividing and nondividing cell suspensions were characterized in short-term experiments. On chlorophyll basis, the gross photosynthetic activities at CO(2) saturating concentration of PA and PM suspensions varied little from those of leaves. On dry weight basis, gross photosynthesis of PA suspensions was equal to that of leaves because of their similar chlorophyll content. This was not the case in PM suspensions where gross photosynthesis was lower and largely varied during the growth cycle. The CO(2) compensation point of PA cells (155-265 parts per million) was much higher than that of leaves (50-80 ppm). Oxygen uptakes were analyzed in terms of mitochondrial respiration, photorespiration and light stimulation of oxygen uptake (LSOU), often identified to Mehlertype reactions. In PA and PM suspensions, mitochondrial respiration rates were higher than in leaves by a factor of 1.5 to 4.5. In PM suspensions, photorespiration and LSOU were observed only in nondividing cells. Photorespiration and LSOU rates were comparable in PA suspensions and leaves. Our results demonstrate that photorespiration of PA suspensions has not been affected by the 2% CO(2) concentration imposed during 2 years of culture.
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Affiliation(s)
- P Carrier
- Association pour la Recherche en Bioénergie Solaire, C.E.N. Cadarache, 13108 Saint-Paul lez Durance, Cedex, France
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Chatelus C, Carrier P, Saignes P, Libert MF, Berlier Y, Lespinat PA, Fauque G, Legall J. Hydrogenase activity in aged, nonviable Desulfovibrio vulgaris cultures and its significance in anaerobic biocorrosion. Appl Environ Microbiol 1987; 53:1708-10. [PMID: 3310883 PMCID: PMC203938 DOI: 10.1128/aem.53.7.1708-1710.1987] [Citation(s) in RCA: 23] [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] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Batch cultures of Desulfovibrio vulgaris stored at 32 degrees C for 10 months have been found to retain 50% of the hydrogenase activity of a 1-day culture. The hydrogenase found in old cultures needs reducing conditions for its activation. Viable cell counts are negative after 6 months, showing that the hydrogenase activity does not depend on the presence of viable cells. These observations are of importance in the understanding of anaerobic biocorrosion of metals caused by depolarization phenomena.
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Affiliation(s)
- C Chatelus
- Section d'Enzymologie et Biochimie Bactérienne, Association pour la Recherche en Bioénergie Solaire, CEN Cadarache, Saint Paul Lez Durance, France
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