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Mensa L, Crespo G, Gastinger MJ, Kabat J, Pérez-del-Pulgar S, Miquel R, Emerson SU, Purcell RH, Forns X. Hepatitis C virus receptors claudin-1 and occludin after liver transplantation and influence on early viral kinetics. Hepatology 2011; 53:1436-45. [PMID: 21294144 PMCID: PMC3082584 DOI: 10.1002/hep.24110] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 11/29/2010] [Indexed: 12/24/2022]
Abstract
UNLABELLED Liver transplantation (LT) is a unique model to study hepatitis C virus (HCV) entry into hepatocytes. Recent in vitro studies suggest significant changes in the expression of the HCV receptors claudin-1 and occludin after HCV infection. Our aims were: (1) to characterize claudin-1 and occludin expression in grafts from LT recipients and (2) to explore their potential influence on early HCV kinetics and their changes after HCV infection. We included 42 HCV-infected LT recipients and 19 uninfected controls. Claudin-1 and occludin were detected in paraffin-embedded liver biopsies obtained during reperfusion and 3 and 12 months after LT. HCV receptors were characterized by confocal immunofluorescence microscopy; quantification and colocalization studies were performed with dedicated software. Claudin-1 and occludin expression were restricted to the apical pole of hepatocytes. There was a significant correlation between the amount of scavenger receptor B1 at the time of reperfusion and the HCV-RNA decay during the first 24 hours following LT (r = 0.55, P = 0.007). Similarly, there was a significant correlation between the levels of claudin and occludin and the slope of HCV-RNA increase during the first week after LT (r = 0.63, P = 0.005). Occludin and claudin-1 levels increased significantly 12 months after LT (P = 0.03 and P = 0.007, respectively). The expression pattern of both proteins, however, remained unchanged, colocalizing strongly (60%-94%) at the apical membrane of hepatocytes. CONCLUSIONS HCV receptor levels at the time of LT seem to modulate early HCV kinetics. Hepatitis C recurrence after LT was associated with increased levels of claudin-1 and occludin in the hepatocyte cell membrane, although it did not alter their localization within the tight junctions.
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Affiliation(s)
- Laura Mensa
- Liver Unit, Hospital Clinic, IDIBAPS, Ciberehd, Barcelona, Spain
| | - Gonzalo Crespo
- Liver Unit, Hospital Clinic, IDIBAPS, Ciberehd, Barcelona, Spain
| | - Matthew J. Gastinger
- Biological Imaging Facility/Research Technologies Branch, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD, USA
| | - Juraj Kabat
- Biological Imaging Facility/Research Technologies Branch, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD, USA
| | | | - Rosa Miquel
- Pathology Department, Hospital Clinic, IDIBAPS, Ciberehd, Barcelona, Spain
| | - Suzanne U. Emerson
- Hepatitis Viruses Section, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD, USA
| | - Robert H Purcell
- Hepatitis Viruses Section, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD, USA
| | - Xavier Forns
- Liver Unit, Hospital Clinic, IDIBAPS, Ciberehd, Barcelona, Spain
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Liang C, Rieder E, Hahm B, Jang SK, Paul A, Wimmer E. Replication of a novel subgenomic HCV genotype 1a replicon expressing a puromycin resistance gene in Huh-7 cells. Virology 2005; 333:41-53. [PMID: 15708591 DOI: 10.1016/j.virol.2004.12.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2004] [Revised: 10/17/2004] [Accepted: 12/23/2004] [Indexed: 11/21/2022]
Abstract
Genotype 1a is a most prevalent genotype of hepatitis C virus in North America yet HCV replication has been studied predominantly with genotype 1b subgenomic replicons under neomycin selection in Huh-7 cells. Development of 1a-related dicistronic replicons under neo selection proved difficult and required either "conditioned" Huh-7 cells and/or chimeric genomes harboring pre-engineered adaptive mutations. We report the construction of a novel dicistronic genotype 1a(H77C) replicon expressing the puromycin N-acetyltransferase (PAC) gene as a selectable marker that, without prior introduction of adaptive mutations, allows establishment of puromycin-resistant Huh-7 colonies after transfection of naive Huh-7 cells. The large majority of HCV1a/PAC replicons did not reveal any adaptive mutations on short-term passage of Huh-7 cells. Continued passage led to mutations in the non-structural genes although these mutations did not significantly enhance replication of the original replicon. Transfection with total cellular RNA isolated from HCV1a/PAC replicon-containing cells led to a significant increase in colony-forming ability. The data identify PAC as an efficient selectable marker for studies of HCV replication, which may be useful with different genotypes in different host cell systems.
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Affiliation(s)
- Chengyu Liang
- Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, NY 11790, USA
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