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2017 ; 101
(5
): 1091-1101
Nephropedia Template TP
Ostrand-Rosenberg S
; Sinha P
; Figley C
; Long R
; Park D
; Carter D
; Clements VK
J Leukoc Biol
2017[May]; 101
(5
): 1091-1101
PMID28007981
show ga
During successful pregnancy, a woman is immunologically tolerant of her
genetically and antigenically disparate fetus, a state known as maternal-fetal
tolerance. How this state is maintained has puzzled investigators for more than
half a century. Diverse, immune and nonimmune mechanisms have been proposed;
however, these mechanisms appear to be unrelated and to act independently. A
population of immune suppressive cells called myeloid-derived suppressor cells
(MDSCs) accumulates in pregnant mice and women. Given the profound immune
suppressive function of MDSCs, it has been suggested that this cell population
may facilitate successful pregnancy by contributing to maternal-fetal tolerance.
We now report that myeloid cells with the characteristics of MDSCs not only
accumulate in the circulation and uterus of female mice following mating but also
suppress T cell activation and function in pregnant mice. Depletion of cells with
the phenotype and function of MDSCs from gestation d 0.5 through d 7.5 resulted
in implantation failure, increased T cell activation, and increased T cell
infiltration into the uterus, whereas induction of MDSCs restored successful
pregnancy and reduced T cell activation. MDSC-mediated suppression during
pregnancy was accompanied by the down-regulation of L-selectin on naïve T cells
and a reduced ability of naïve T cells to enter lymph nodes and become activated.
Because MDSCs regulate many of the immune and nonimmune mechanisms previously
attributed to maternal-fetal tolerance, MDSCs may be a unifying mechanism
promoting maternal-fetal tolerance, and their induction may facilitate successful
pregnancy in women who spontaneously abort or miscarry because of dysfunctional
maternal-fetal tolerance.