Recurrent miscarriage is associated with a decline of decidual natural killer cells expressing killer cell immunoglobulin-like receptors specific for human leukocyte antigen C.
JOURNAL OF OBSTETRICS AND GYNAECOLOGY RESEARCH(2014)
Abstract
AimTo investigate the relationship between natural killer (NK) cell phenotype and recurrent miscarriage (RM). MethodsWe studied killer cell immunoglobulin-like receptor (KIR) expression on decidual NK cells in women with RM. ResultsThe expression of KIR2DL1/S1 on CD56(+)CD16(-) NK cells in the deciduas of these women was significantly lower than in that of control subjects (P=0.026). There was a significant decline in the frequency of CD56(+)CD16(-) NK cells staining for KIR2DL1/S1 and KIR2DL2/S2/L3 throughout the first trimester in patients (P<0.05). Furthermore, by stratification of the women in three groups according to gestational stage, it was found that KIR2DL1/S1 expressing NK cells were significantly decreased in all groups, especially around gestational days 50-70 (P=0.010). ConclusionThis is the first report to demonstrate that RM is associated with a decline in the frequency of decidual NK cells expressing KIR specific for human leukocyte antigen (HLA)-C, and in which gestational stage was considered. The results suggest that KIR phenotype contributes to the pathogenesis of the disease, and that assessment of KIR may serve as a diagnostic tool.
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Key words
decidua,human,killer cell immunoglobulin-like receptor,natural killer cells,recurrent miscarriage
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