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Helle F, Brochot E, Fournier C, Descamps V, Izquierdo L, Hoffmann TW, Morel V, Herpe YE, Bengrine A, Belouzard S, Wychowski C, Dubuisson J, Francois C, Regimbeau JM, Castelain S, Duverlie G. Correction: Permissivity of Primary Human Hepatocytes and Different Hepatoma Cell Lines to Cell Culture Adapted Hepatitis C Virus. PLoS One 2019; 14:e0223022. [PMID: 31536586 PMCID: PMC6752794 DOI: 10.1371/journal.pone.0223022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Fouquet G, Marcq I, Debuysscher V, Bayry J, Rabbind Singh A, Bengrine A, Nguyen-Khac E, Naassila M, Bouhlal H. Signaling lymphocytic activation molecules Slam and cancers: friends or foes? Oncotarget 2018; 9:16248-16262. [PMID: 29662641 PMCID: PMC5882332 DOI: 10.18632/oncotarget.24575] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 10/19/2016] [Accepted: 12/03/2017] [Indexed: 01/01/2023] Open
Abstract
Signaling Lymphocytic Activation Molecules (SLAM) family receptors are initially described in immune cells. These receptors recruit both activating and inhibitory SH2 domain containing proteins through their Immunoreceptor Tyrosine based Switch Motifs (ITSMs). Accumulating evidence suggest that the members of this family are intimately involved in different physiological and pathophysiological events such as regulation of immune responses and entry pathways of certain viruses. Recently, other functions of SLAM, principally in the pathophysiology of neoplastic transformations have also been deciphered. These new findings may prompt SLAM to be considered as new tumor markers, diagnostic tools or potential therapeutic targets for controlling the tumor progression. In this review, we summarize the major observations describing the implications and features of SLAM in oncology and discuss the therapeutic potential attributed to these molecules.
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Affiliation(s)
- Gregory Fouquet
- INSERM 1247-GRAP, Centre Universitaire de Recherche en Santé CURS, Université de Picardie Jules Verne, CHU Sud, Amiens, France
| | - Ingrid Marcq
- INSERM 1247-GRAP, Centre Universitaire de Recherche en Santé CURS, Université de Picardie Jules Verne, CHU Sud, Amiens, France
| | - Véronique Debuysscher
- INSERM 1247-GRAP, Centre Universitaire de Recherche en Santé CURS, Université de Picardie Jules Verne, CHU Sud, Amiens, France
| | - Jagadeesh Bayry
- INSERM UMRS 1138, Centre de Recherche des Cordeliers-Paris, Paris, France
| | | | | | - Eric Nguyen-Khac
- INSERM 1247-GRAP, Centre Universitaire de Recherche en Santé CURS, Université de Picardie Jules Verne, CHU Sud, Amiens, France.,Service Hepato-Gastroenterologie, Centre Hospitalier Universitaire Sud, Amiens, France
| | - Mickael Naassila
- INSERM 1247-GRAP, Centre Universitaire de Recherche en Santé CURS, Université de Picardie Jules Verne, CHU Sud, Amiens, France
| | - Hicham Bouhlal
- INSERM 1247-GRAP, Centre Universitaire de Recherche en Santé CURS, Université de Picardie Jules Verne, CHU Sud, Amiens, France
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Bengrine A, Brochot E, Louchet M, Herpe YE, Duverlie G. Modeling of HBV and HCV hepatitis with hepatocyte-like cells. Front Biosci (Schol Ed) 2016; 8:97-105. [PMID: 26709899 DOI: 10.2741/s449] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Chronic liver diseases caused by either hepatitis B or C viruses are a major health problem around the world. Despite major advances accomplished in recent years in understanding the physiology of both viruses using in vitro and/or in vivomodels, there is no vaccine for HCV available. Moreover, susceptibility to acute and chronic infection and the response to treatments are different between HBV or HCV infected patients. Crucial information can be collected using a robust cell model that permits the culture of clinical isolates along with the investigation of the virus-host interaction. The recent progress in the field of cell reprogramming and differentiation has opened new opportunities in viral hepatitis research raising the hopes of developing new improved therapeutics. In this review, we discuss current models for hepatitis B and C studies and their limitations, and also the iPSC model, and its relevance to the viral host cell interactions.
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Affiliation(s)
| | - Etienne Brochot
- Virology Research Unit, EA 4294, Jules Verne University of Picardie, Amiens, France
| | - Marie Louchet
- Biobanque de Picardie, CHU Amiens-Picardie, Amiens cedex 1 France, Virology Research Unit, EA 4294, Jules Verne University of Picardie, Amiens, France
| | | | - Gilles Duverlie
- Biobanque de Picardie, CHU Amiens-Picardie, Amiens cedex 1 France, Virology Research Unit, EA 4294, Jules Verne University of Picardie, Amiens, France, Department of Virology, CBH, CHU Amiens-Picardie, Amiens cedex 1 France
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Keil SD, Bengrine A, Bowen R, Marschner S, Hovenga N, Rouse L, Gilmour D, Duverlie G, Goodrich RP. Inactivation of viruses in platelet and plasma products using a riboflavin-and-UV-based photochemical treatment. Transfusion 2015; 55:1736-44. [PMID: 25731607 DOI: 10.1111/trf.13030] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 12/17/2014] [Accepted: 12/26/2014] [Indexed: 11/29/2022]
Abstract
BACKGROUND Multilayered blood safety programs reduce the risk of transfusion-transmitted diseases; however, there remains a risk of window period transmission of screened viruses and transmission of unscreened and emerging viruses from asymptomatic donors. To reduce this risk, a riboflavin-and-UV-light-based pathogen reduction process was evaluated against eight viral agents. STUDY DESIGN AND METHODS Riboflavin and UV light was evaluated against the following eight viral agents: encephalomyocarditis virus (EMC), hepatitis A virus (HAV), hepatitis C virus (HCV), influenza A (FLUAV), La Crosse virus (LACV), pseudorabies virus (PRV), sindbis virus (SINV), and vesicular stomatitis virus (VSV). Before treatment, a sample was removed to determine the product's initial viral load. After treatment the product's viral load was reevaluated and the log reduction was calculated. RESULTS Virus reduction after treatment with riboflavin and UV light is equivalent in platelet (PLT) and plasma units, as demonstrated by a 3.2-log reduction of EMC in plasma, PLTs, and PLT additive solution containing 35% plasma. Additionally, the following viral reductions values were observed: HAV 1.8 log, HCV at least 4.1 log, FLUAV at least 5.0 log, LACV at least 3.5 log, PRV 2.5 log, SINV 3.2 log, and VSV at least 6.3 log. CONCLUSIONS The results observed in this study suggest that treating PLT and plasma products with a riboflavin-and-UV-light-based pathogen reduction process could potentially eliminate window period transmission of screened viruses and greatly reduce the risk of transfusion transmission of unscreened viruses.
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Affiliation(s)
| | | | | | | | | | | | | | - Gilles Duverlie
- Biobanque de Picardie, EA4294, UPJV, CHU-Amiens, Amiens, France
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Figaro S, Pereira U, Dumé AS, Rada H, Capone S, Bengrine A, Baze A, Rabenirina E, Semenzato N, Herpe YE, Faivre J, Dufresne M, Richert L, Duverlie G, Daujat-Chavanieu M, Saliba F, Pouchoulin D, Legallais C. SUPPLIVER: Bioartificial supply for liver failure. Ing Rech Biomed 2015. [DOI: 10.1016/j.irbm.2015.01.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Bengrine A, Kiel S, Marschner S, Goodrich R, Duverlie G. L’inactivation photochimique du virus de l’hépatite C en utilisant le Système Mirasol® PRT. Transfus Clin Biol 2014. [DOI: 10.1016/j.tracli.2014.08.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Metzinger-Le Meuth V, Andrianome S, Chillon JM, Bengrine A, Massy ZA, Metzinger L. microRNAs are dysregulated in the cerebral microvasculature of CKD mice. Front Biosci (Elite Ed) 2014; 6:80-8. [PMID: 24389144 DOI: 10.2741/e693] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Vascular calcification arises during chronic kidney disease (CKD), and increases the risk of cardiovascular mortality. In CKD, alterations of cerebral circulation were linked with an increase in ischemic strokes and behavioral troubles. Studying pathophysiological mechanisms of calcifications and detecting new biomarkers in the cerebral circulation is thus an important issue. microRNAs are small non-coding, single-stranded RNAs that regulate messenger RNAs at the post-transcriptional level. They are involved in numerous pathologies and represent new opportunities to develop disease predictors. We used RT-qPCR to quantify endothelial-specific microRNAs in cerebral arterioles from WT mice and from pathological models of CKD. We used four mice groups: WT SHAM, WT CKD, Apolipoprotein E Knock-Out (ApoE-KO) SHAM, ApoE-KO CKD. Brains were removed after two and ten weeks of uremia and RNA from cerebral arterioles was extracted. miR-17 and miR-126 were the most dysregulated in the pathological conditions, at both the second week and tenth week of uremia. Our results suggest that miR-17 and miR-126 are potential new biomarkers of cerebral troubles of CKD patients and new therapeutic targets for innovative treatments.
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Affiliation(s)
- Valerie Metzinger-Le Meuth
- INSERM U1088, Faculty of Pharmacy and Medicine, University of Picardie Jules Verne, Rue des Louvels, F-80037, Amiens, France
| | - Soafara Andrianome
- INSERM U1088, Faculty of Pharmacy and Medicine, University of Picardie Jules Verne, Rue des Louvels, F-80037, Amiens, France
| | - Jean-Marc Chillon
- INSERM U1088, Faculty of Pharmacy and Medicine, University of Picardie Jules Verne, Rue des Louvels, F-80037, Amiens, France
| | - Abderrahmane Bengrine
- INSERM U1088, Faculty of Pharmacy and Medicine, University of Picardie Jules Verne, Rue des Louvels, F-80037, Amiens, France
| | - Ziad A Massy
- INSERM U1088, Faculty of Pharmacy and Medicine, University of Picardie Jules Verne, Rue des Louvels, F-80037, Amiens, France
| | - Laurent Metzinger
- INSERM U1088, Faculty of Pharmacy and Medicine, University of Picardie Jules Verne, Rue des Louvels, F-80037, Amiens France
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Taïbi F, Metzinger-Le Meuth V, M'Baya-Moutoula E, Djelouat MSEI, Louvet L, Bugnicourt JM, Poirot S, Bengrine A, Chillon JM, Massy ZA, Metzinger L. Possible involvement of microRNAs in vascular damage in experimental chronic kidney disease. Biochim Biophys Acta 2014; 1842:88-98. [PMID: 24140891 DOI: 10.1016/j.bbadis.2013.10.005] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 09/25/2013] [Accepted: 10/08/2013] [Indexed: 10/26/2022]
Abstract
Chronic kidney disease (CKD) is associated with vascular calcifications and atherosclerosis. There is a need for novel predictors to allow earlier diagnosis of these disorders, predict disease progression, and improve assessment of treatment response. We focused on microRNAs since they are implicated in a variety of cellular functions in cardiovascular pathology. We examined changes of microRNA expression in aortas of CKD and non-CKD wild type mice and apolipoprotein E knock-out mice, respectively. Both vascular smooth muscle-specific miR-143 and miR-145 expressions were decreased in states of atherosclerosis and/or CKD or both, and the expression level of protein target Myocardin was increased. The inflammatory miR-223 was increased in more advanced stages of CKD, and specific protein targets NFI-A and GLUT-4 were dramatically decreased. Expression of miR-126 was markedly increased and expression of protein targets VCAM-1 and SDF-1 was altered during the course of CKD. The drug sevelamer, commonly used in CKD, corrected partially these changes in microRNA expression, suggesting a direct link between the observed microRNA alterations and uremic vascular toxicity. Finally, miR-126, -143 and -223 expression levels were deregulated in murine serum during the course of experimental CKD. In conclusion, these miRNAs could have role(s) in CKD vascular remodeling and may therefore represent useful targets to prevent or treat complications of CKD.
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Affiliation(s)
- Fatiha Taïbi
- INSERM U1088, 1 Rue des Louvels, F-80037 Amiens, University of Picardie Jules Verne, Amiens, France
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Helle F, Brochot E, Fournier C, Descamps V, Izquierdo L, Hoffmann TW, Morel V, Herpe YE, Bengrine A, Belouzard S, Wychowski C, Dubuisson J, Francois C, Regimbeau JM, Castelain S, Duverlie G. Permissivity of primary human hepatocytes and different hepatoma cell lines to cell culture adapted hepatitis C virus. PLoS One 2013; 8:e70809. [PMID: 23940646 PMCID: PMC3734273 DOI: 10.1371/journal.pone.0070809] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Accepted: 06/24/2013] [Indexed: 01/16/2023] Open
Abstract
Significant progress has been made in Hepatitis C virus (HCV) culture since the JFH1 strain cloning. However, developing efficient and physiologically relevant culture systems for all viral genotypes remains an important goal. In this work, we aimed at producing a high titer JFH1 derived virus to test different hepatic cells’ permissivity. To this end, we performed successive infections and obtained a JFH1 derived virus reaching high titers. Six potential adaptive mutations were identified (I599V in E2, R1373Q and M1611T in NS3, S2364P and C2441S in NS5A and R2523K in NS5B) and the effect of these mutations on HCV replication and infectious particle production was investigated. This cell culture adapted virus enabled us to efficiently infect primary human hepatocytes, as demonstrated using the RFP-NLS-IPS reporter protein and intracellular HCV RNA quantification. However, the induction of a strong type III interferon response in these cells was responsible for HCV inhibition. The disruption of this innate immune response led to a strong infection enhancement and permitted the detection of viral protein expression by western blotting as well as progeny virus production. This cell culture adapted virus also enabled us to easily compare the permissivity of seven hepatoma cell lines. In particular, we demonstrated that HuH-7, HepG2-CD81, PLC/PRF/5 and Hep3B cells were permissive to HCV entry, replication and secretion even if the efficiency was very low in PLC/PRF/5 and Hep3B cells. In contrast, we did not observe any infection of SNU-182, SNU-398 and SNU-449 hepatoma cells. Using iodixanol density gradients, we also demonstrated that the density profiles of HCV particles produced by PLC/PRF/5 and Hep3B cells were different from that of HuH-7 and HepG2-CD81 derived virions. These results will help the development of a physiologically relevant culture system for HCV patient isolates.
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Affiliation(s)
- Francois Helle
- EA4294, Laboratoire de Virologie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
- * E-mail:
| | - Etienne Brochot
- EA4294, Laboratoire de Virologie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
| | - Carole Fournier
- EA4294, Laboratoire de Virologie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
| | - Véronique Descamps
- EA4294, Laboratoire de Virologie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
| | - Laure Izquierdo
- EA4294, Laboratoire de Virologie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
| | - Thomas W. Hoffmann
- EA4294, Laboratoire de Virologie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
| | - Virginie Morel
- EA4294, Laboratoire de Virologie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
| | - Yves-Edouard Herpe
- Biobanque de Picardie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
| | - Abderrahmane Bengrine
- Biobanque de Picardie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
| | - Sandrine Belouzard
- Institut Pasteur de Lille, Center of Infection & Immunity of Lille (CIIL), F-59019 Lille, France; Inserm U1019, F-59019 Lille, France; CNRS UMR8204, F-59021 Lille, France; Univ Lille Nord de France, F-59000 Lille, France
| | - Czeslaw Wychowski
- Institut Pasteur de Lille, Center of Infection & Immunity of Lille (CIIL), F-59019 Lille, France; Inserm U1019, F-59019 Lille, France; CNRS UMR8204, F-59021 Lille, France; Univ Lille Nord de France, F-59000 Lille, France
| | - Jean Dubuisson
- Institut Pasteur de Lille, Center of Infection & Immunity of Lille (CIIL), F-59019 Lille, France; Inserm U1019, F-59019 Lille, France; CNRS UMR8204, F-59021 Lille, France; Univ Lille Nord de France, F-59000 Lille, France
| | - Catherine Francois
- EA4294, Laboratoire de Virologie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
| | - Jean-Marc Regimbeau
- Département de Chirurgie Digestive, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
| | - Sandrine Castelain
- EA4294, Laboratoire de Virologie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
| | - Gilles Duverlie
- EA4294, Laboratoire de Virologie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
- Biobanque de Picardie, Centre Hospitalier Universitaire et Université de Picardie Jules Verne, Amiens, France
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Hoffmann TW, Duverlie G, Gilles D, Bengrine A, Abderrahmane B. MicroRNAs and hepatitis C virus: toward the end of miR-122 supremacy. Virol J 2012; 9:109. [PMID: 22691570 PMCID: PMC3489824 DOI: 10.1186/1743-422x-9-109] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 05/30/2012] [Indexed: 12/11/2022] Open
Abstract
The most common etiologic agents causing chronic hepatitis are hepatitis C and B viruses (HCV and HBV, respectively). Chronic infection caused by HCV is considered one of the major causative agents of liver cirrhosis and hepatocellular carcinoma worldwide. In combination with the increasing rate of new HCV infections, the lack of a current vaccine and/or an effective treatment for this virus continues to be a major public health challenge. The development of new treatments requires a better understanding of the virus and its interaction with the different components of the host cell. MicroRNAs (miRNAs) are small non-coding RNAs functioning as negative regulators of gene expression and represent an interesting lead to study HCV infection and to identify new therapeutic targets. Until now, microRNA-122 (miR-122) and its implication in HCV infection have been the focus of different published studies and reviews. Here we will review recent advances in the relationship between HCV infection and miRNAs, showing that some of them emerge in publications as challengers against the supremacy of miR-122.
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Affiliation(s)
- Thomas Walter Hoffmann
- EA4294 Unité de Virologie Clinique et Fondamentale, Université de Picardie Jules Verne, UFR de Médecine et de Pharmacie, 3 rue des Louvels, 80036, Amiens Cedex, France
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Bugnicourt JM, Silveira CD, Bengrine A, Godefroy O, Baumbach G, Sevestre H, Bode-Boeger SM, Kielstein JT, Massy ZA, Chillon JM. Chronic renal failure alters endothelial function in cerebral circulation in mice. Am J Physiol Heart Circ Physiol 2011; 301:H1143-52. [DOI: 10.1152/ajpheart.01237.2010] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [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] [Indexed: 11/22/2022]
Abstract
We examined structure, composition, and endothelial function in cerebral arterioles after 4 wk of chronic renal failure (CRF) in a well-defined murine model (C57BL/6J and apolipoprotein E knockout female mice). We also determined quantitative expression of endothelial nitric oxide synthase (eNOS), phosphorylated eNOS (on serine 1177 and threonine 495), and caveolin-1; quantitative expression of markers of vascular inflammation or oxidative stress [Rock-1, Rock-2, VCAM-1, and peroxisome proliferator-activated receptor-γ (PPARγ)]; and the plasma concentration of l-arginine and asymmetric dimethylarginine (ADMA). Our hypothesis was that endothelial function would be impaired in cerebral arterioles during CRF following either a decrease in NO production (through alteration of eNOS expression or regulation) or an increase in NO degradation (due to oxidative stress or vascular inflammation). Endothelium-dependent relaxation was impaired during CRF, but endothelium-independent relaxation was not. CRF had no effect on cerebral arteriolar structure and composition. Quantitative expressions of eNOS, eNOS phosphorylated on serine 1177, caveolin-1, Rock-1, Rock-2, and VCAM-1 were similar in CRF and non-CRF mice. In contrast, quantitative expression of PPARγ (which exercises a protective role on blood vessels) was significantly lower in CRF mice, whereas quantitative expression of eNOS phosphorylated on the threonine 495 (the inactive form of eNOS) was significantly higher. Lastly, the plasma concentration of ADMA (a uremic toxin and an endogenous inhibitor of eNOS) was elevated and plasma concentration of l-arginine was low in CRF. In conclusion, endothelial function is impaired in a mouse model of early stage CRF. These alterations may be related (at least in part) to a decrease in NO production.
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Affiliation(s)
- Jean-Marc Bugnicourt
- Institut National de la Santé et de la Recherche Médicale, ERI12
- Services de 3Neurologie and
| | - Charlène Da Silveira
- Institut National de la Santé et de la Recherche Médicale, ERI12
- Université de Picardie Jules Verne, Amiens, France
| | - Abderrahmane Bengrine
- Institut National de la Santé et de la Recherche Médicale, ERI12
- Université de Picardie Jules Verne, Amiens, France
| | - Olivier Godefroy
- Université de Picardie Jules Verne, Amiens, France
- Services de 3Neurologie and
| | - Gary Baumbach
- Department of Pathology, University of Iowa College of Medicine, Iowa City, Iowa
| | - Henri Sevestre
- Université de Picardie Jules Verne, Amiens, France
- Service d'Anatomo-Pathologie, Centre Hospitalier Universitaire Amiens, Amiens, France
| | | | - Jan T. Kielstein
- Department of Nephrology and Hypertension, Medical School Hanover, Hanover, Germany
| | - Ziad A. Massy
- Institut National de la Santé et de la Recherche Médicale, ERI12
- Université de Picardie Jules Verne, Amiens, France
- Pharmacologie Clinique et Néphrologie, Centre Hospitalier Universitaire Amiens, Amiens, France
| | - Jean-Marc Chillon
- Institut National de la Santé et de la Recherche Médicale, ERI12
- Université de Picardie Jules Verne, Amiens, France
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Hu JC, Bengrine A, Lis A, Awayda MS. Alternative mechanism of activation of the epithelial na+ channel by cleavage. J Biol Chem 2009; 284:36334-36345. [PMID: 19858199 PMCID: PMC2794749 DOI: 10.1074/jbc.m109.032870] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [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] [Received: 06/11/2009] [Revised: 10/19/2009] [Indexed: 11/06/2022] Open
Abstract
We examined activation of the human epithelial sodium channel (ENaC) by cleavage. We focused on cleavage of alphaENaC using the serine protease subtilisin. Trimeric channels formed with alphaFM, a construct with point mutations in both furin cleavage sites (R178A/R204A), exhibited marked reduction in spontaneous cleavage and an approximately 10-fold decrease in amiloride-sensitive whole cell conductance as compared with alphaWT (2.2 versus 21.2 microsiemens (microS)). Both alphaWT and alphaFM were activated to similar levels by subtilisin cleavage. Channels formed with alphaFD, a construct that deleted the segment between the two furin sites (Delta175-204), exhibited an intermediate conductance of 13.2 microS. More importantly, alphaFD retained the ability to be activated by subtilisin to 108.8 +/- 20.9 microS, a level not significantly different from that of subtilisin activated alphaWT (125.6 +/- 23.9). Therefore, removal of the tract between the two furin sites is not the main mechanism of channel activation. In these experiments the levels of the cleaved 22-kDa N-terminal fragment of alpha was low and did not match those of the C-terminal 65-kDa fragment. This indicated that cleavage may activate ENaC by the loss of the smaller fragment and the first transmembrane domain. This was confirmed in channels formed with alphaLD, a construct that extended the deleted sequence of alphaFD by 17 amino acids (Delta175-221). Channels with alphaLD were uncleaved, exhibited low baseline activity (4.1 microS), and were insensitive to subtilisin. Collectively, these data support an alternative hypothesis of ENaC activation by cleavage that may involve the loss of the first transmembrane domain from the channel complex.
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Affiliation(s)
- John Cong Hu
- Department of Physiology and Biophysics, State University of New York, Buffalo, New York 14214
| | - Abderrahmane Bengrine
- Department of Physiology and Biophysics, State University of New York, Buffalo, New York 14214
| | - Agnieszka Lis
- Department of Physiology and Biophysics, State University of New York, Buffalo, New York 14214
| | - Mouhamed S Awayda
- Department of Physiology and Biophysics, State University of New York, Buffalo, New York 14214.
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Abstract
We tested the hypothesis that the serine protease trypsin can indirectly activate the epithelial Na(+) channel (ENaC). Experiments were carried out in Xenopus oocytes and examined the effects on the channel formed by all three human ENaC subunits and that formed by Xenopus epsilon and human beta and gamma subunits (epsilonbetagammaENaC). Low levels of trypsin (1-10 ng/ml) were without effects on the oocyte endogenous conductances and were specifically used to test the effects on ENaC. Addition of 1 ng/ml trypsin for 60 min stimulated the amiloride-sensitive human ENaC conductance (g(Na)) by approximately 6-fold. This effect on the g(Na) was [Na(+)]-independent, thereby ruling out an interaction with channel feedback inhibition by Na(+). The indirect nature of this activation was confirmed in cell-attached patch clamp experiments with trypsin added to the outside of the pipette. Trypsin was comparatively ineffective at activating epsilonbetagammaENaC, a channel that exhibited a high spontaneous open probability. These observations, in combination with surface binding experiments, indicated that trypsin indirectly activated membrane-resident channels. Activation by trypsin was also dependent on catalytic activity of this protease but was not accompanied by channel subunit proteolysis. Channel activation was dependent on downstream activation of G-proteins and was blocked by G-protein inhibition by injection of guanyl-5'-yl thiophosphate and by pre-stimulation of phospholipase C. These data indicate a receptor-mediated activation of ENaC by trypsin. This trypsin-activated receptor is distinct from that of protease-activated receptor-2, because the response to trypsin was unaffected by protease-activated receptor-2 overexpression or knockdown.
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Affiliation(s)
- Abderrahmane Bengrine
- Department of Physiology and Biophysics, State University of New York, Buffalo, New York 14214
| | - Jinqing Li
- Department of Physiology and Biophysics, State University of New York, Buffalo, New York 14214
| | - L Lee Hamm
- Department of Medicine, Tulane University Health Sciences Center, New Orleans, Louisiana 70112
| | - Mouhamed S Awayda
- Department of Physiology and Biophysics, State University of New York, Buffalo, New York 14214.
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16
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Abstract
Protein kinase A anchoring proteins or AKAPs regulate the activity of many ion channels. Protein kinase A (PKA) is a well-recognized target of AKAPs, with other kinases now emerging as additional targets. We examined the roles of epithelial-expressed AKAPs in regulating the epithelial Na+ channel (ENaC). Experiments used heterologous expression with AKAP15, AKAP-KL, and AKAP79 in Xenopus oocytes. Experiments were carried out under high and low Na+ conditions, as Na+ loading is known to affect the baseline activity of ENaC in a PKC-dependent mechanism. ENaC activity was unaffected by AKAP79 and AKAP-KL expression. However, oocytes coexpressing AKAP15 exhibited an 80% and 91% reduction in the amiloride-sensitive, whole-cell conductance in high and low Na+ conditions, respectively. The reduced channel activity was unaffected by PKA activation or inhibition, indicating a PKA-independent mechanism. Expression with a membrane-targeting domain, mutant form of AKAP15 (AKAP15m) prevented the decrease of ENaC activity, but only under low Na+ conditions. In high sodium conditions, coexpression with AKAP15m led to an increase of ENaC activity to levels similar to those observed under low Na+. These results indicate that membrane-associated AKAP15 reduces ENaC activity whereas the cytoplasmically associated one may participate in the channel's feedback inhibition by intracellular Na+, a process known to involve PKC. This hypothesis was further confirmed in coexpression experiments, which demonstrated functional and physical interaction between AKAP15 and PKCalpha. We propose that AKAP15 regulates ENaC via a novel PKA-independent pathway.
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Affiliation(s)
- Abderrahmane Bengrine
- Department of Physiology and Biophysics, SUNY at Buffalo, 3435 Main St., Buffalo, NY 14214, USA
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17
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Ouhtit A, Matrougui K, Bengrine A, Koochekpour S, Zerfaoui M, Yousief Z. Survivin is not only a death encounter but also a survival protein for invading tumor cells. FRONT BIOSCI-LANDMRK 2007; 12:1260-70. [PMID: 17127378 DOI: 10.2741/2144] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [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: 11/22/2022]
Abstract
Cell proliferation and cell death pathways meet at a pivotal crossroad, crucial to maintain normal homeostasis and to eliminate dangerous cells before they start dividing. Survivin (SVV) is an intriguing and fascinating protein at this crossroad that interfaces life and death, through its dual role in facilitating cell division and encountering apoptosis. SVV's prominent expression in essentially all human malignancies, and low or no expression in most normal tissues, suggests that it would be an ideal target for cancer-directed therapy. However, SVV has been recently described as a target for fine tuning by alternative splicing mechanism generating five defined splice variants and a number of other uncharacterized/bizarre isoforms. This diversity indicates that SVV, in addition to its known functions in tumorgenesis, angiogenesis and cardiovascular diseases, might be associated with other unknown functions. Intriguingly, new accumulating evidence from our own work and others, suggest a novel role for SVV in the mechanisms of tumor invasion and metastasis. The SVV pathway has now provided tangible opportunities for targeted, rational cancer therapy. It is therefore an attractive and promising therapeutic target not only for cancer but also for other diseases. Although a number of studies utilizing SVV as an anti-cancer strategy are well underway, further investigation into the exact molecular interactions underpinning its functions is critical for the success of such trials. Impeding development of safe and effective SVV antagonists for clinical use is due to a lack of understanding the molecular mechanisms by which SVV differentially affects apoptosis and cell division in both normal and malignant cells. In this report, in addition to reviewing the SVV known functions, we discuss the newly proposed mechanisms by which SVV might serve as a survival tool for invading tumor cells.
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Affiliation(s)
- Allal Ouhtit
- Department of Pathology, Stanley S. Scott Cancer Center, Louisiana State University Health Science Center, New Orleans, LA 70112, USA.
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18
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Awayda MS, Shao W, Vukojicic I, Bengrine A. A simple in vivo method for assessing changes of membrane-bound ion channel density in Xenopus oocytes. Methods Mol Biol 2006; 337:101-15. [PMID: 16929942 DOI: 10.1385/1-59745-095-2:101] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Heterologous expression systems, such as Xenopus oocytes, are widely used to study the regulation and the structure function relationship of ion channels and transporters. In the case of ion channels, activity can be easily measured by conventional two-electrode voltage clamping. However, this method only measures the sum of the activity of all plasma membrane-bound channels. Therefore, this measurement cannot discriminate between effects on channel density and individual channel activity. To address this shortcoming, we have developed a simple assay to detect changes of membrane-bound channel density in intact oocytes. This nonradioactive assay relies on specific antibody binding in whole live cells utilizing a simple spectrophotometric measurement. This assay is linear over a wide range of channel expression levels and provides a simple cost-effective way of monitoring changes of membrane-bound channel density. Moreover, when the heterologous proteins poorly express at the plasma membrane, this method becomes advantageous to complex biochemical cell fractionation.
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19
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Abstract
Rabbit esophageal epithelia actively transport Na(+) in a manner similar to that observed in classic electrically tight Na(+)-absorbing epithelia, such as frog skin. However, the nature of the apical entry step is poorly understood. To address this issue, we examined the electrophysiological and biochemical nature of this channel. Western blotting experiments with epithelial Na(+) channel (ENaC) subunit-specific antibodies revealed the presence of all three ENaC subunits in both native and immortalized esophageal epithelial cells. The amino acid sequence of the rabbit alpha-ENaC cloned from native rabbit esophageal epithelia was not significantly different from that of other published alpha-ENaC homologs. To characterize the electrophysiological properties of this native apical channel, we utilized nystatin permeabilization to eliminate the electrical contribution of the basolateral membrane in isolated native epithelia mounted in Ussing-type chambers. We find that the previously described apical Na(+) channel is nonselective for monovalent cations (Li(+), Na(+), and K(+)). Moreover, this channel was not blocked by millimolar concentrations of amiloride. These findings document the presence of a nonselective cation channel in a native Na(+) transporting epithelia, a finding that hereto has been thought to be limited to artificial culture conditions. Moreover, our data are consistent with a potential role of ENaC subunits in the formation of a native nonselective cation channel.
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Affiliation(s)
- Mouhamed S Awayda
- Dept. of Physiology, SL 39, Tulane University Health Sciences Center, New Orleans, LA 70112, USA.
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20
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Awayda MS, Platzer JD, Reger RL, Bengrine A. Role of PKCalpha in feedback regulation of Na(+) transport in an electrically tight epithelium. Am J Physiol Cell Physiol 2002; 283:C1122-32. [PMID: 12225976 DOI: 10.1152/ajpcell.00142.2002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [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: 11/22/2022]
Abstract
It has long been known that Na(+) channels in electrically tight epithelia are regulated by homeostatic mechanisms that maintain a steady state and allow new levels of transport to be sustained in hormonally challenged cells. Little is known about the potential pathways involved in these processes. In addition to short-term effect, recent evidence also indicates the involvement of PKC in the long-term regulation of the epithelial Na(+) channel (ENaC) at the protein level (40). To determine whether stimulation of ENaC involves feedback regulation of PKC levels, we utilized Western blot analysis to determine the distribution of PKC isoforms in polarized A6 epithelia. We found the presence of PKC isoforms in the conventional (alpha and gamma), novel (delta, eta, and epsilon), and atypical (iota, lambda, and zeta) groups. Steady-state stimulation of Na(+) transport with aldosterone was accompanied by a specific decrease of PKCalpha protein levels in both the cytoplasmic and membrane fractions. Similarly, overnight treatment with an uncharged amiloride analog (CDPC), a procedure that through feedback regulation causes a stimulation of Na(+) transport, also decreased PKCalpha levels. These effects were additive, indicating separate mechanisms that converge at the level of PKCalpha. These effects were not accompanied by changes of PKCalpha mRNA levels as determined by Northern blot analysis. We propose that this may represent a novel regulatory feedback mechanism necessary for sustaining an increase of Na(+) transport.
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Affiliation(s)
- Mouhamed S Awayda
- Department of Physiology, Tulane University Health Sciences Center, New Orleans, LA 70112, USA.
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21
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Bengrine A, Guiliani N, Appia-Ayme C, Jedlicki E, Holmes DS, Chippaux M, Bonnefoy V. Sequence and expression of the rusticyanin structural gene from Thiobacillus ferrooxidans ATCC33020 strain. Biochim Biophys Acta 1998; 1443:99-112. [PMID: 9838063 DOI: 10.1016/s0167-4781(98)00199-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The periplasmic blue copper protein rusticyanin is thought to play an important role in iron oxidation by Thiobacillus ferrooxidans. We present the sequence of the gene, rus, encoding rusticyanin together with about 1.4 kb of upstream and 0.3 kb of downstream DNA. The rus gene is unique to T. ferrooxidans. Evidence is presented that it is the last gene of an operon and that it can be transcribed from its own promoter. In ATCC33020 strain, rusticyanin is synthesized in ferrous iron but also in sulfur growth conditions suggesting that it could play a role in both energetic metabolisms. The rus gene transcribed from a vector promoter in Escherichia coli leads to the production of a processed aporusticyanin in the periplasmic space, indicating that its signal sequence is correctly recognized by the secretion machinery and the signal peptidase of E. coli.
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Affiliation(s)
- A Bengrine
- Laboratoire de Chimie Bactérienne, Institut de Biologie Structurale et de Microbiologie, Centre National de la Recherche Scientifique, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
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22
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Appia-Ayme C, Bengrine A, Cavazza C, Giudici-Orticoni MT, Bruschi M, Chippaux M, Bonnefoy V. Characterization and expression of the co-transcribed cyc1 and cyc2 genes encoding the cytochrome c4 (c552) and a high-molecular-mass cytochrome c from Thiobacillus ferrooxidans ATCC 33020. FEMS Microbiol Lett 1998; 167:171-7. [PMID: 9809418 DOI: 10.1111/j.1574-6968.1998.tb13224.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The sequence of the cyc1 gene encoding the Thiobacillus ferrooxidans ATCC 33020 c552 cytochrome, shows that this cytochrome is a 21-kDa periplasmic c4-type cytochrome containing two similar monohaem domains. The kinetics of reduction and the fact that cytochromes c4 are considered to be physiological electron donors of cytochrome oxidases suggest that the last steps of the iron respiratory chain are: rusticyanin-->cytochrome c4-->cytochrome oxidase. In Thiobacillus ferrooxidans, cyc1 is co-transcribed with the cyc2 gene, encoding a high-molecular-mass monohaem cytochrome c. This suggests that the cytochromes encoded by these genes belong to the same electron transfer chain.
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Affiliation(s)
- C Appia-Ayme
- Laboratoire de Chimie Bactérienne, CNRS, Marseille, France
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23
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Guiliani N, Bengrine A, Borne F, Chippaux M, Bonnefoy V. Alanyl-tRNA synthetase gene of the extreme acidophilic chemolithoautotrophic Thiobacillus ferrooxidans is highly homologous to alaS genes from all living kingdoms but cannot be transcribed from its promoter in Escherichia coli. Microbiology (Reading) 1997; 143 ( Pt 7):2179-2187. [PMID: 9245807 DOI: 10.1099/00221287-143-7-2179] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The alaS gene of Thiobacillus ferrooxidans has been cloned and sequenced and its expression in Escherichia coli and T. ferrooxidans analysed. The same genomic organization to that in E. coli (recA-recX-alaS) has been found in T. ferrooxidans. The recA and alaS genes cannot be transcribed from their own promoters in E. coli. In addition to the well-known homology at the protein level between AlaS proteins from various organisms, a strong homology was found between all the known alaS genes from bacteria, archaea and eucarya. Two regions, one of which corresponds to the catalytic core, are particularly well-conserved at the nucleotide sequence level, a possible indication of strong constraints during evolution on these parts of the genes.
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Affiliation(s)
- Nicolas Guiliani
- Laboratoire de Chimie Bactérienne, Institut de Biologie Structurale et de Microbiologie, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Abderrahmane Bengrine
- Laboratoire de Chimie Bactérienne, Institut de Biologie Structurale et de Microbiologie, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Francoise Borne
- Laboratoire de Chimie Bactérienne, Institut de Biologie Structurale et de Microbiologie, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Marc Chippaux
- Laboratoire de Chimie Bactérienne, Institut de Biologie Structurale et de Microbiologie, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Violaine Bonnefoy
- Laboratoire de Chimie Bactérienne, Institut de Biologie Structurale et de Microbiologie, 31 chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
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24
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Jourlin C, Bengrine A, Chippaux M, Méjean V. An unorthodox sensor protein (TorS) mediates the induction of the tor structural genes in response to trimethylamine N-oxide in Escherichia coli. Mol Microbiol 1996; 20:1297-306. [PMID: 8809780 DOI: 10.1111/j.1365-2958.1996.tb02648.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We isolated and characterized three spontaneous mutations leading to trimethylamine N-oxide (TMAO)-independent expression of the tor operon encoding the TMAO-reductase anaerobic respiratory system in Escherichia coli. The mutations lie in a new for regulatory gene, the torS gene, which probably encodes a sensor protein of a two-component regulatory system. One mutation, which leads to full TMAO-constitutive expression, is a 3-amino-acid deletion within the potential N-terminal periplasmic region, suggesting that this region contains the TMAO-detector site. For the other two mutations, a further induction of the tor operon is observed when TMAO is added. Both are single substitutions and affect the linker region located between the detector and the conserved transmitter domains. Thus, as proposed for other sensors, the TorS linker region might play an essential role in propagating conformational changes between the detector and the cytoplasmic signalling regions. The TorS histidine kinase is an unorthodox sensor that contains a receiver and a C-terminal alternative transmitter domain in addition to the domains found in most sensors. Previously, we showed that TMAO induction of the for operon requires the TorR response regulator and the TorT periplasmic protein. Additional genetic data confirm that torS encodes the sensor partner of TorR and TorT. First, insertion within torS abolishes tor operon expression whatever the growth conditions. Second, overexpressed TorR bypasses the requirement for torS, whereas the torT gene product is dispensable for tor operon expression in a torS constitutive mutant. This supports a signal-transduction cascade from TorT to TorR via TorS.
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Affiliation(s)
- C Jourlin
- Laboratoire de Chimie Bactérienne, Institut de Biologie Structurale et Microbiologie, Centre National de la Recherche Scientifique, Marseille, France
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