Trophoblast CD200 expression in successful human pregancies and missed abortions

Presence of the CD200 immune check-point inhibitor at the feto-maternal interface is linked to prevention of spontaneous abortion in mice and humans. In human missed abortions (MA), absence of Th17-driven inflammation has been attributed to expression of villus trophoblast CD200 quantified using immunohistochemistry. While rapid aneuploidy (QF-PCR) testing linked low CD200 to pregnancy failure, data showing normal VT CD200 in first trimester normal pregnancy and in abortion of chromosomally abnormal embryos has not been demonstrated. The present report shows normal CD200 in a 7 week gestation termination with normal male QF-PCR and in a 10 week male trisomy 18 MA.