Abstract
Cytokines such as interleukin-1 (IL-1) and tumor necrosis factor alpha (TNF alpha) are produced by leukocytes and play a role in immune responses. They also function in normal brain physiology as well as in pathological conditions within the central nervous system, where they are produced by brain macrophages (microglia) and brain astrocytes. In this study, we document the ability of human immunodeficiency virus type 1 (HIV-1) to induce TNF alpha and IL-1 in primary rat brain cultures. While productive infection did not occur in these cells, it was not required for cytokine induction. Using monocyte/macrophage-tropic (JRFL) and T-cell-tropic (IIIB) strains of HIV-1, we were able to induce cytokines in both microglia and astrocytes. In addition to whole virus, recombinant envelope proteins also induced these cytokines. The induction of IL-1 and TNF alpha could be blocked by a panel of antibodies recognizing epitopes in the gp120 and gp41 areas of the envelope. Soluble recombinant CD4 did not block TNF alpha and IL-1 production. If TNF alpha and IL-1 can be induced in brain tissue by HIV-1, they may contribute to some of the neurologic disorders associated with AIDS.
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