INBIRS   24491
INSTITUTO DE INVESTIGACIONES BIOMEDICAS EN RETROVIRUS Y SIDA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Seminal Plasma Modulates Dendritic Cell Function Favoring the Generation of CD25+/FOXP3+ T-cells
Autor/es:
MERLOTTI IPPÓLITO, ANTONELLA; RUIZ, MARÍA JULIA; ERRA DÍAZ, FERNANDO; DANTAS, EZEQUIEL; VARESE, AUGUSTO; DUETTE, GABRIEL; PEREYRA, PEHUÉN; ERNST, GLENDA; GEFFNER, JORGE; SABATTE, JUAN
Lugar:
Ciudad del Cabo
Reunión:
Congreso; HIV Research for Prevention Conference; 2014
Resumen:
Background: Unprotected sexual intercourse is the most common
mode of HIV-1 transmission being semen the most important
vector for this infection. Dendritic cells (DCs) are abundantly
located on mucosal surfaces and play different roles during HIV
infection: promote HIV spread by boosting CD4 + T cell infection
and activate the HIV specific adaptive immune response. As semen
has been shown to promote immune tolerance in different
models, we hypothesize that components present in plasma
seminal (SP) might modulate DC function promoting a tolerogenic
immune response. To test this, we study the ability of
complete SP to modulate DC function and the ability of these cells
to induce CD25 + /FOXP3 + regulatory T cells.
Methods: SP was obtained from healthy donors. Monocyte derived
DCs were cultured during 24 hs with SP samples (diluted 1/
100) in the absence or presence of LPS (10ng/ml). DC phenotype
was studied by flow cytometry. Cytokine secretion was measured
in culture supernatants by ELISA. After SP treatment, DCs were
cultured with allogeneic CD4 + T cells and the induction of
CD25 + /FOXP3 + T cells was analyzed by flow cytometry.
Results: We found that SP inhibited IL-12, IL-6, TNF-alpha and
IL-1, but not IL-10 production by LPS stimulated DCs (percent of
inhibition respect to LPS alone: 81.2 + / -11.07% p < 0.0001 for
IL-12, 43.45 + / -2.87% p < 0.001 for IL-6, 69.8 + / -17.31%
p < 0.001 for TNF-alpha, 37.5 + / -13.15% p < 0.05 for IL-1,
6.1 + / -15.6% p = 0.6 for IL-10). SP also boosted the ability of LPS
stimulated DCs to induce CD25 + /FOXP3 + T cells (PS +LPS =
20,4% vs LPS alone = 6%, p < 0,05). We observed no changes on
the expression of HLA-DR, CD80, CD86, CD83, CD40 and CD1a
on immature or LPS-maturated DCs after incubation with SP.
Conclusions: SP modulates DC function, inhibiting the secretion
of pro-inflammatory cytokines and favoring the induction of
CD25 + /FOXP3 + T cells. In this way, we speculate that SP
might modulate the adaptive immune response against sexual
transmitted pathogens.