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Stem cell factor (SCF) and its receptor Kit regulate the proliferation and survival of early hematopoietic cell types as well as germ cells and melanocytes. As SCF augments the effects of several hematopoietic growth factors that are produced in reproductive tissues during pregnancy and also plays an important role in cell migration, proliferation, and survival, we studied the expression and localization of this receptor/ligand in human endometrial and placental tissues. Kit was detected by Western blot analysis in early decidual and placental tissues (8-19 weeks gestation) and in term placenta. Immunohistochemistry localized Kit mainly in trophoblast and to a lesser extent in scattered cells in the placental villous core and decidual stroma. Ribonuclease protection assay showed that SCF messenger ribonucleic acid (mRNA) expression increased 3-fold in decidua from early pregnancy compared to proliferative and secretory endometrium (P &lt; 0.05). Placental tissues expressed 4- to 8-fold higher levels of SCF mRNA compared to decidus (P &lt; 0.05). Isolated placental villous core expressed 7-fold higher levels of SCF mRNA than did trophoblast (P &lt; 0.05). Thus, SCF and its receptor Kit are expressed in human endometrium and placental tissues during pregnancy, and the pattern of receptor/ligand expression suggests that endometrial and placental villous core SCF may have a paracrine effect on trophoblast through the receptor Kit.

The expression of stem cell factor and its receptor, c-kit in human endometrium and placental tissues during pregnancy.