Factors affecting cellular tropism of human immunodeficiency virus - PubMed (original) (raw)
Factors affecting cellular tropism of human immunodeficiency virus
S Kim et al. J Virol. 1990 Nov.
Abstract
To evaluate the basis of the slow growth of many human immunodeficiency virus strains in monocytes/macrophages, various stages of the virus life cycle have been studied for their possible contribution to viral tropism. Although we found that monocytic U937 cells had a higher percentage of CD4-positive cells than T-lymphoid H9 cells, the human immunodeficiency virus strain grew much less efficiently in the monocytic line. Viral tropism was primarily determined during the early stages of the virus cycle, that is, sometime between binding of the virus to the cell surface and reverse transcription of viral genomic RNA. Once the virus entered the host cell, reverse transcription, use of the long terminal repeat, RNA expression, and production of virus particles was about as efficient in monocytes as in T cells. Thus, during viral entry into the host cell cytoplasm there is a major limiting event that is particularly inefficient in U937 cells and possibly in all monocytes/macrophages.
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