Inflammatory cytokine expression is correlated with the level of human immunodeficiency virus (HIV) transcripts in HIV-infected placental trophoblastic cells

J Virol. 1997 May;71(5):3628-35. doi: 10.1128/JVI.71.5.3628-3635.1997.


The inflammatory cytokines interleukin-1beta (IL-1beta), IL-6, and tumor necrosis factor alpha (TNF-alpha) have been associated with increased human immunodeficiency virus (HIV) expression and enhanced lymphocyte adhesion to trophoblastic cells in experimental systems. To determine if there is a correlation between the expression of these cytokines and the levels of HIV transcripts in trophoblasts of term placentas from HIV-infected women, we studied the placentae of 30 HIV-positive and 13 control gravidae. Twenty-three of the HIV-positive women received zidovudine (ZDV) as prophylaxis against HIV vertical transmission; only one of the seven women who did not receive ZDV was a transmitter, for an overall vertical transmission rate of 3.8%. Cytokine production was measured by enzyme-linked immunosorbent assay in the supernatants of trophoblastic cell cultures. Additionally, cytokine transcripts and HIV gag sequences were determined by a quantitative reverse transcription-PCR assay. In general, trophoblastic cells of HIV-positive placentas expressed significantly higher levels of IL-1beta, IL-6, and TNF-alpha than those of control placentas. All placentas from HIV-positive women expressed HIV gag transcripts at either a low (<156 copies per microg of total RNA) or a high (>156 copies per microg of total RNA) level. There was a statistically significant positive association between the basal level of TNF-alpha production and the level of HIV gag transcripts of HIV-positive placental trophoblastic cells. Nevertheless, these data, coupled with a low transmission rate, would indicate that some other factors, perhaps working in concert with cytokines, are necessary for vertical transmission of HIV from mother to infant.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Cells, Cultured
  • Cytokines / biosynthesis*
  • Cytokines / genetics
  • Female
  • HIV / genetics*
  • HIV Infections / transmission
  • Humans
  • Infant, Newborn
  • Infectious Disease Transmission, Vertical
  • Lipopolysaccharides / pharmacology
  • Pregnancy
  • RNA, Messenger / analysis*
  • RNA, Viral / analysis*
  • Trophoblasts / immunology
  • Trophoblasts / virology*


  • Cytokines
  • Lipopolysaccharides
  • RNA, Messenger
  • RNA, Viral