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Different requirements for scavenger receptor class B type I in hepatitis C virus cell-free versus cell-to-cell transmission

Catanese, MT and Loureiro, J and Jones, CT and Dorner, M and von, HT and Rice, MC (2013) Different requirements for scavenger receptor class B type I in hepatitis C virus cell-free versus cell-to-cell transmission. Journal of Virology. pp. 8282-8293.

Abstract

Hepatitis C virus (HCV) is believed to initially infect the liver through the basolateral side of hepatocytes, where it engages attachment factors and the coreceptors CD81 and scavenger receptor class B type I (SR-BI). Active transport toward the apical side brings the virus in close proximity of additional entry factors, the tight junction molecules claudin-1 and occludin. HCV is also thought to propagate via cell-to-cell spread, which allows highly efficient virion delivery to neighboring cells. In this study, we compared an adapted HCV genome, clone 2, characterized by superior cell-to cell spread, to its parental genome, J6/JFH-1, with the goal of elucidating the molecular mechanisms of HCV cell-to-cell transmission. We show that CD81 levels on the donor cells influence the efficiency of cell-to-cell spread and CD81 transfer between neighboring cells correlates with the capacity of target cells to become infected. Spread of J6/JFH-1 was blocked by anti-SR-BI antibody or in cells knocked down for SR-BI, suggesting a direct role for this receptor in HCV cell-to-cell transmission. In contrast, clone 2 displayed a significantly reduced dependence on SR-BI for lateral spread. Mutations in E1 and E2 responsible for the enhanced cell-to-cell spread phenotype of clone 2 rendered cell-free virus more susceptible to antibody-mediated neutralization. Our results indicate that although HCV can lose SR-BI dependence for cell-to-cell spread, vulnerability to neutralizing antibodies may limit this evolutionary option in vivo. Combination therapies targeting both the HCV glycoproteins and SR-BI may therefore hold promise for effective control of HCV dissemination. 2013, American Society for Microbiology

Item Type: Article
Additional Information: pubid: 70 nvp_institute: NIBR contributor_address: (Catanese, Loureiro, Jones, Dorner, Rice) Center for the Study of Hepatitis C, Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY, United States (von Hahn) Institute for Molecular Biology and Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, Germany (Jones) Novartis Institutes for BioMedical Research, Emeryville, CA, United States
Date Deposited: 13 Oct 2015 13:13
Last Modified: 13 Oct 2015 13:13
URI: https://oak.novartis.com/id/eprint/21913

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