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

MJ Bunders, JL van Hamme, MH Jansen, K Boer… - Scientific Reports, 2014 - nature.com
MJ Bunders, JL van Hamme, MH Jansen, K Boer, NA Kootstra, TW Kuijpers
Scientific Reports, 2014nature.com
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 …
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.
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