Abstract
It is generally recognized that macrophage-tropic human immunodeficiency virus type 1 (HIV-1) is the predominant population during the acute and asymptomatic phases of HIV-1 infection. Here, we compared the proliferation and syncytium-inducing activities of different HIV-1 strains in primary CD4+ T cells expressing various helper T (Th)-type cytokine profiles. The macrophage-tropic HIV-1 strains HIV-1JR-CSF, HIV-1NFN-SX, and HIV-1SF162 could proliferate vigorously and generate syncytia in primary CD4+ T cells irrespective of their Th subtype, in contrast to the T-cell-line-tropic HIV-1 strains HIV-1NL4-3 and HIV-1IIIB, which favored non-type 1 Th conditions. These results indicate that macrophage-tropic HIV-1 may be more invasive and virulent, since it kills more CD4+ Th1 cells than T-cell-line-tropic HIV-1 during the early stages of HIV-1 infection, when the Th1 immune response is dominant.
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