Abstract
Human immunodeficiency virus type 1 (HIV-1), the agent of AIDS, frequently infects the central nervous system. We inoculated adult human brain cultures with chimeric viruses containing parts of the env gene of a cloned primary isolate from brain tissue, HIV-1 JRFl, inserted into the cloned DNA of a T-cell-tropic strain. A chimeric virus containing the carboxy-terminal portion of HIV-1 JRFl env did not replicate in these brain tissue cultures, while a chimera expressing an env-encoded protein containing 158 amino acids of HIV-1 JRFl gp120, including the V3 loop, replicated well in brain microglial cells, as it does in blood macrophages. Infection of brain microglial cells with such a chimera was blocked by an antibody to the V3 loop of gp 120. Thus, env determinants in the region of gp120, outside the CD4-binding site and comprising the V3 loop, are critical for efficient viral binding to and/or entry into human brain microglia.
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Selected References
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