Fetal exposure to HIV-1 alters chemokine receptor expression by CD4+T cells and increases susceptibility to HIV-1

Sci Rep. 2014 Oct 24:4:6690. doi: 10.1038/srep06690.

Abstract

Absolute numbers of lymphocytes are decreased in uninfected infants born to HIV-1-infected women (HIV-1-exposed). Although the exact mechanism is unknown, fetal exposure to maternal HIV-1-infection could prime the immune system and affect T cell trafficking. We compared the expression of chemokine receptors on cord blood CD4(+) T cells from HIV-1-exposed children and healthy controls. At baseline CD4(+) T cells had a largely naïve phenotype. However, stimulation with cytokines resulted in an upregulation of inflammatory response-related chemokine receptors on CD4(+) T cells, with HIV-1-exposed infants having a significantly higher frequency of CD4(+) T cells expressing, in particularly Th2 associated chemokine receptors (CCR3 p < 0.01, CCR8 p = 0.03). Numbers of naive CCR7(+) CD4(+) T cells were reduced (p = 0.01) in HIV-1-exposed infants. We further assessed whether the inflammatory phenotype was associated with susceptibility to HIV-1 and detected higher levels of p24 upon in in vitro infection of stimulated CD4(+) T cells of HIV-1-exposed infants. In summary, fetal exposure to HIV-1 primes the immune system in the infant leading to an enhanced immune activation and altered T cell homing, with potential ramifications regarding T cell responses and the acquisition of HIV-1 as an infant.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • CD4 Lymphocyte Count
  • CD4-Positive T-Lymphocytes / immunology
  • CD4-Positive T-Lymphocytes / metabolism*
  • CD4-Positive T-Lymphocytes / virology*
  • Case-Control Studies
  • Cluster Analysis
  • Female
  • Fetal Blood / cytology
  • Gene Expression Profiling
  • Gene Expression*
  • Genetic Predisposition to Disease*
  • HIV Infections / genetics*
  • HIV Infections / immunology
  • HIV Infections / virology*
  • HIV-1*
  • Humans
  • Immunophenotyping
  • Infant
  • Infant, Newborn
  • Phenotype
  • Pregnancy
  • Receptors, Chemokine / genetics*

Substances

  • Receptors, Chemokine