Infection of human fetal dorsal root ganglion glial cells with human immunodeficiency virus type 1 involves an entry mechanism independent of the CD4 T4A epitope.

Journal of Virology
C KunschB Wigdahl

Abstract

Human immunodeficiency virus type 1 (HIV-1) has been implicated in the generation of acquired immunodeficiency syndrome-associated neurological dysfunction, and it is believed that the presence of CD4 in the nervous system may be involved in the susceptibility of selected neural cell populations to HIV-1 infection. We previously demonstrated (B. Wigdahl, R. A. Guyton, and P. S. Sarin, Virology 159:440-445, 1987) that glial cells derived from human fetal dorsal root ganglion (DRG) are susceptible to HIV-1 infection and subsequently express at least a fraction of the virus genome. In contrast to HIV-1 infection of CD4+ lymphocytes, which can be blocked by treatment with monoclonal antibodies directed against the HIV-1-binding region of CD4 (T4A epitope), treatment of human fetal DRG glial cells with similar antibodies resulted in only a slight reduction in HIV-1-specific gag antigen expression. In addition, preincubation of the HIV-1 inoculum prior to infection with HIV-1-neutralizing antiserum did not reduce HIV-1 gag antigen expression in these cells. Furthermore, we were unable to detect the synthesis or accumulation of the CD4 molecule in neural cell populations derived from DRG. However, a protected CD4-specific RNA fragment...Continue Reading

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