Effects of the human immunodeficiency virus type 1 Tat protein on the expression of inflammatory cytokines

Luigi Buonaguro, Giovanni Barillari, Hsiao K. Chang, Cindy A. Bohan, Vivian Kao, Richard Morgan, Robert C. Gallo, Barbara Ensoli

Research output: Contribution to journalArticlepeer-review


Increased levels of inflammatory cytokines, including tumor necrosis factor (TNF), interleukin-1 (IL-1), and IL-6, have been detected in specimens from human immunodeficiency virus type 1 (HIV-1)-infected individuals. Here we demonstrate that HIV-1 activates the expression of TNF but not of IL-1 and IL-6 in acutely and chronically infected T cells. The increase in TNF gene expression is due to activation of the TNF promoter by the viral gene product Tat. Transactivation of TNF gene expression requires the product of the first exon of the tat gene and is cell type independent. T cells chronically infected with pol-defective HIV-1 provirus constitutively express both Tat and TNF at levels significantly higher (fivefold) than those seen in control cells, and treatment with phorbol myristate acetate greatly enhances Tat expression and TNF production. As TNF can increase the production of IL-1 and IL-6 and these inflammatory cytokines all enhance HIV-1 gene expression and affect the immune, vascular, and central nervous systems, the activation of TNF by Tat may be part of a complex pathway in which HIV-1 uses viral products and host factors to increase its own expression and infectivity and to induce disease.

Original languageEnglish
Pages (from-to)7159-7167
Number of pages9
JournalJournal of Virology
Issue number12
Publication statusPublished - Dec 1992

ASJC Scopus subject areas

  • Immunology


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