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J. Virol., 08 1995, 4814-4822, Vol 69, No. 8
Copyright © 1995, American Society for Microbiology

Susceptibility to duck hepatitis B virus infection is associated with the presence of cell surface receptor sites that efficiently bind viral particles

JC Pugh, Q Di, WS Mason and H Simmons
Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111, USA.

To test the hypothesis that susceptibility of hepatocytes to duck hepatitis B virus (DHBV) infection requires cell surface receptors that bind the virus in a specific manner, we developed an assay for the binding of DHBV particles to monolayers of intact cells, using radiolabeled immunoglobulin G specific for DHBV envelope protein. Both noninfectious DHBV surface antigen particles and infectious virions bound to a susceptible fraction (approximately 60%) of Pekin duck hepatocytes. In contrast, binding did not occur to cells that were not susceptible to DHBV infection, including Pekin duck fibroblasts and chicken hepatocytes, and binding to Muscovy duck hepatocytes, which are only weakly susceptible (approximately 1% of cells) to DHBV infection, was virtually undetectable. Within a monolayer, individual Pekin duck hepatocytes appeared to differ markedly in the capacity to bind DHBV, which may explain difficulties that have been encountered in infecting 100% of cells in culture. We have also found that the loss of susceptibility to infection with DHBV that occurs when Pekin duck hepatocytes are maintained for more than a few days in culture correlates with a decline in the number of cells that bind virus particles efficiently. All of these results support the interpretation that the binding event detected by our assay is associated with the interaction between DHBV and specific cell surface receptors that are required for initiation of infection. Our assay may facilitate isolation and identification of hepatocyte receptors for this virus.

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