Human immunodeficiency virus type 1 T-cell tropism is determined by events prior to provirus formation - PubMed (original) (raw)

Human immunodeficiency virus type 1 T-cell tropism is determined by events prior to provirus formation

A J Cann et al. J Virol. 1990 Oct.

Abstract

Different strains of human immunodeficiency virus type 1 (HIV-1) vary in the ability to replicate in cells that bear the HIV-1 receptor, CD4. The mechanism responsible for these cell tropism differences is unknown. We examined different isolates of HIV-1 with regard to replication in specific tumor-derived CD4-positive T-cell lines and normal peripheral blood lymphocytes. To investigate early events in the virus life cycle at low multiplicities of infection, we used a modification of the polymerase chain reaction method. Use of a molecularly cloned primary HIV-1 isolate, HIV-1 JR-CSF, restricted for replication in T-cell lines, demonstrated that little or no viral DNA or RNA was synthesized in nonpermissive cells after infection. However, transfection of proviral DNA resulted in efficient transient virus production from these cells. Therefore, we conclude that at least one block to infection for HIV-1 strains in nonpermissive T cells occurs at a point in entry or uncoating before provirus formation.

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