title: Expression of mRNA for cell adhesion molecules in the bovine corpus luteum during the estrous cycle and PGF2alpha-induced luteolysis.
abstract: Cell-to-cell interaction via cell contact-dependent pathway is essentially important for maintenance and regulation of corpus luteum (CL) integrity and its physiological actions. The objective of the present study was to evaluate the mRNA expression of the cell adhesion molecules (CAMs) that are constituent factors of gap junctions [connexin (Cx) 43] and adherence junctions (VE-, E-, N-cadherin) in two types of endothelial cells from the mid CL and in CL tissue during the estrous cycle and PGF(2alpha)-induced luteolysis in the cow. Specific mRNA expression for Cx43 and N-cadherin was detected in cytokeratin-positive (CK+) and cytokeratin-negative (CK-) luteal endothelial cells (EC) and fully luteinized granulosa cells (LGC). E-cadherin mRNA was expressed in CK+EC and LGC, but not in CK-EC. VE-cadherin mRNA was expressed in both CK+ and CK-EC. During the estrous cycle, Cx43 mRNA expression was significantly lower in the regressing CL. VE-cadherin expression also tended to increase in the mid CL and increased significantly in the regressing CL. E-cadherin mRNA expression was higher in the early and late CL than in the mid- and regressing CL. N-cadherin mRNA expression gradually increased from the early to late CL followed by a decrease in the regressing CL. During PGF(2alpha)-induced luteolysis, Cx43 mRNA expression appeared to increase, and VE-cadherin and E-cadherin mRNA significantly increased at 24 h. N-cadherin mRNA expression decreased 2 and 4 h after PGF(2alpha) administration. Collectively, expression of the mRNAs for CAMs was different in the two types of luteal endothelial cells and fully luteinized granulosa cells and changed independently in the CL during the estrous cycle and PGF(2alpha)-induced luteolysis in the cow. The results suggest that CAMs play physiological roles in cell-to-cell communication to regulate both gap and adherence junctions during CL development and regression in the cow.
authors.affiliation: Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan.
authors.forename: Koumei
authors.initials: K
authors.lastname: Shirasuna
authors.forename: Sho
authors.initials: S
authors.lastname: Watanabe
authors.forename: Kaya
authors.initials: K
authors.lastname: Nagai
authors.forename: Kiemi
authors.initials: K
authors.lastname: Sasahara
authors.forename: Takashi
authors.initials: T
authors.lastname: Shimizu
authors.forename: Albert M
authors.initials: AM
authors.lastname: Ricken
authors.forename: Katharina
authors.initials: K
authors.lastname: Spanel-Borowski
authors.forename: Akio
authors.initials: A
authors.lastname: Miyamoto
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000235:genetics; D015820:Cadherins / Q000235:genetics; D002417:Cattle; D015815:Cell Adhesion Molecules / Q000235:genetics*; D002478:Cells, Cultured; D018031:Connexin 43 / Q000235:genetics; D003338:Corpus Luteum / Q000187:drug effects / Q000502:physiology*; D015237:Dinoprost / Q000494:pharmacology*; D019332:Endothelin-1 / Q000235:genetics; D030762:Estrous Cycle / Q000502:physiology*; D005260:Female; D015870:Gene Expression / Q000187:drug effects / Q000502:physiology; D012333:RNA, Messenger / Q000378:metabolism; D051178:alpha Catenin / Q000235:genetics; D051176:beta Catenin / Q000235:genetics; D000099152:Cadherin 5