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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Biol+Reprod
2013 ; 88
(6
): 155
Nephropedia Template TP
gab.com Text
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Maternal decidual macrophages inhibit NK cell killing of invasive
cytotrophoblasts during human pregnancy
#MMPMID23553431
Co EC
; Gormley M
; Kapidzic M
; Rosen DB
; Scott MA
; Stolp HA
; McMaster M
; Lanier LL
; Bárcena A
; Fisher SJ
Biol Reprod
2013[Jun]; 88
(6
): 155
PMID23553431
show ga
Human pregnancy is an immunological paradox. Semiallogeneic (fetal) placental
cells (extravillous cytotrophoblasts [CTBs]) invade the uterine lining (decidua),
which contains a unique decidual natural killer (dNK) cell population, identified
by the cell surface phenotype CD56(bright) CD16(-) CD3(-) and CD14(+) CD206(+)
macrophages (dMac). Previous reports suggested that human dNK cells are not a
threat to the fetoplacental unit because they are anergic. In contrast, here we
showed that purified and exogenously stimulated dNK cells are capable killers of
cellular targets, including semiallogeneic CTBs. However, dMacs in the decidual
leukocyte (DL) population restrained dNK killing through a transforming growth
factor beta1 (TGF-beta1)-dependent mechanism. Our findings support a new model
whereby dNK cells, capable of killing CTBs, are prevented from doing so by
neighboring macrophages, thus protecting the fetal cells from NK cell attack. We
speculate that this mechanism would inhibit dNK cell-mediated killing, even under
conditions where high levels of cytokines may stimulate dNK cells, which could
pose a threat to the developing placenta.