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2017 ; 7
(ä): 43857
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Highly-Exposed HIV-1 seronegative Female Commercial Sex Workers sustain in their
genital mucosa increased frequencies of tolerogenic myeloid and regulatory
T-cells
#MMPMID28262752
Thibodeau V
; Fourcade L
; Labbé AC
; Alary M
; Guédou F
; Poudrier J
; Roger M
Sci Rep
2017[Mar]; 7
(ä): 43857
PMID28262752
show ga
We and others have shown that HIV-1 highly-exposed seronegative (HESN) female
commercial sex workers (CSWs) maintain low genital inflammatory conditions to
prevent HIV infection. HIV-1 interacts with toll-like receptors (TLR)-7/8 to
induce interferon (IFN)-?, an important antiviral and immunomodulatory cytokine,
which act together with interleukin (IL)-10, human leukocyte antigen (HLA)-G and
immunoglobulin-like transcript (ILT)-4 to initiate a "tolerogenic/regulatory"
anti-inflammatory loop. In view of further unravelling elements associated with
natural immunity to HIV-1, we have characterised TLR-7, IFN-?, IL-10, HLA-G and
ILT-4 expression profiles in the genital tract of female CSWs and
HIV-1-uninfected non-CSWs from Benin. Endocervical myeloid HLA-DR(+) cells from
HESN CSWs expressed higher levels of IFN-?, TLR-7, IL-10 and HLA-G than those
from both HIV-1-infected CSWs and HIV-1-uninfected non-CSWs. Further
characterization of the endocervical myeloid HLA-DR(+) cells in HESN CSWs
revealed a population of "tolerogenic" CD103(+) CD14(+) CD11c(+) myeloid cells
expressing high levels of IFN-? and IL-10. Concomitantly, HESN CSWs had higher
frequencies of endocervical regulatory CD4(+) T-cells when compared to those from
the two other groups of women. These novel findings provide strong evidence to
support the implication of tolerogenic myeloid cells expressing high levels of
antiviral molecules in shaping the genital mucosal immune response to prevent HIV
infection.