Are CD57+ natural killer cells really important in early pregnancy failure?
ABSTRACT The aim of this study was to compare the CD57+ Natural Killer (NK) cell counts in normal pregnancies and in cases grouped according to different types of early pregnancy failure.
A prospective case control study which was set in Baskent University Faculty of Medicine, Obstetrics and Gynecology Department. A total of 119 women whose pregnancies ended in the first trimester were divided into elective pregnancy termination, incomplete miscarriage, intrauterine demise, ectopic pregnancy and recurrent pregnancy loss groups. CD57+ NK cells were stained and counted in the histologic preparations of the decidua in all of these groups.
CD57+ NK cell counts were 2.14+/-1.42 in control, 2.24+/-1.92 in incomplete miscarriage, 1.82+/-1.34 in intrauterine demise, 2.54+/-1.80 in ectopic pregnancy and 3.42+/-2.15 in recurrent pregnancy failure group. There were no statistically significant differences between the control group and the other four groups with respect to the CD57+ NK cell counts.
This study suggests that CD57+ NK cell count is not associated with early pregnancy failure.
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ABSTRACT: To analyze concentrations of endometrial leukocytes in patients with idiopathic-repeated abortions. Biopsies of exactly dated secretory endometrium in 25 patients with idiopathic-repeated abortions and 10 control patients without a history of miscarriage were compared with respect to the concentrations of T-helper cells (CD4), cytotoxic T-cells (CD8), B-cells (CD19) and uterine natural killer cells (CD56) by immunohistochemistry and RNase protection assays. All examined cells were detectable within secretory endometrium. No statistically significant differences of the examined immune-cell concentrations were seen between the control group and the repeated miscarriage group by either test. This study suggests that the concentrations of specific endometrial leukocytes in a non-pregnant cycle are not associated with repeated pregnancy loss. Thus, the hypothesis of an altered endometrial immunity in patients with repeated miscarriages, symbolized by persistently differing local immune-cell concentrations, has to be questioned.Archives of Gynecology 07/2009; 281(6):983-90. DOI:10.1007/s00404-009-1179-9 · 1.28 Impact Factor