Abstract
Decidual NK cells (dNK) are a unique type of NK cells found at the maternal-fetal interface during pregnancy. dNK play a key role in placental development, trophoblast invasion, and immunity to viral and bacterial infection of the placenta. dNK are the predominant leukocyte population in first trimester placental tissues and comprise around 70% of the total CD45+ leukocytes. dNK remain present throughout pregnancy but their proportion decreases to 20-40% of term placenta decidual tissue leukocytes. Investigation of dNK function throughout pregnancy is of high clinical relevance for understanding the development of placental inflammatory disorders as well as maternal-to-fetal transmission of pathogens. In this chapter, we describe in detail the methods we developed to purify dNK from first trimester and term pregnancy placental tissues. These methods are suitable to assess their protein and gene expression profiles as well as their function.
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