Modulation of accessory cell function and interleukin-6 production by the HIV-1 tat gene.

G. K. Iwamoto, S. A. Konicek, H. L. Twigg

Research output: Contribution to journalArticle

11 Scopus citations


Manifestations of HIV-1 infection such as fever, hypergammaglobulinemia, and interstitial pneumonitis may be due to increased production of inflammatory cytokines such as interleukin-1 and interleukin-6 (IL-6). Monocytes/macrophages of HIV-1-infected individuals have been noted to produce increased amounts of IL-6, as well as to have enhanced accessory cell function. These studies examined the ability of HIV-1 tat, an important HIV-1 regulatory gene, to modulate monocyte/macrophage function. In these experiments, HIV-1 tat-transfected THP-1 cells, a monocytic cell line, enhanced THP-1 immune accessory cell function in the presence of pokeweed mitogen and concanavalin A. HIV-1 tat-transfected cells also increased production of lipopolysaccharide-stimulated IL-6 mRNA and IL-6 protein. The ability of monocytes/macrophages to support HIV-1 production while exhibiting little or no cytopathic effects allows these cells to serve as a reservoir for the virus. The ability of HIV-1 tat to regulate cellular function in monocytes/macrophages may play an important part in the pathogenesis of HIV-1 infection.

Original languageEnglish (US)
Pages (from-to)580-585
Number of pages6
JournalAmerican journal of respiratory cell and molecular biology
Issue number5
StatePublished - May 1994

ASJC Scopus subject areas

  • Molecular Biology
  • Pulmonary and Respiratory Medicine
  • Clinical Biochemistry
  • Cell Biology

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