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The human endometrium prepares for implantation of the blastocyst by reorganization of its whole cellular network. Endometrial stroma cells change their phenotype starting around the 23rd day of the menstrual cycle. These predecidual stroma cells first appear next to spiral arteries, and after implantation these cells further differentiate into decidual stroma cells. The phenotypical changes in these cells during decidualization are characterized by distinct changes in the actin filaments and filament-related proteins such as alpha-actinin. The carboxy-terminal LIM domain protein with a molecular weight of 36 kDa (CLP36) is a cytoskeletal component that has been shown to associate with contractile actin filaments and to bind to alpha-actinin supporting a role for CLP36 in cytoskeletal reorganization and signal transduction by binding to signaling proteins. The expression patterns of CLP36, alpha-actinin and actin were studied in endometrial stroma cells from different stages of the menstrual cycle and in decidual stroma cells from the 6th week of gestation until the end of pregnancy. During the menstrual cycle, CLP36 is only expressed in the luminal and glandular epithelium but not in endometrial stroma cells. During decidualization and throughout pregnancy, a parallel upregulation of CLP36 and smooth muscle actin, an early marker of decidualization in the baboon, was observed in endometrial decidual cells. Since both proteins maintain a high expression level throughout pregnancy, a role of both proteins is suggested in the stabilization of the cytoskeleton of these cells that come into close contact with invading trophoblast cells.

Concerted Upregulation of CLP36 and Smooth Muscle Actin Protein Expression in Human Endometrium during Decidualization