title: Changes in the levels of progesterone receptor mRNA and protein in the bovine corpus luteum during the estrous cycle.
abstract: Progesterone (P4) is synthesized in the luteal cells of many species. The objective of the present study was to determine the expression pattern of P4 receptor (PR) mRNA and the distribution of PR protein in the bovine corpus luteum (CL) during the estrous cycle. The gene expression of PR in the bovine CL throughout the estrous cycle was determined by real-time PCR analysis, and the PR protein expression was evaluated by immunohistochemistry. Messenger RNA of PR was clearly expressed in the CL throughout the estrous cycle. The level of PR mRNA in the CL was highest at the early stage of the estrous cycle and was higher at the mid and late stages than at the regressed stage (P<0.01). In regard to the distribution of PR, the protein was expressed in both small and large luteal cells and in vascular endothelial cells throughout the estrous cycle. These results suggest that P4 has a role in regulating luteal and endothelial cell function in the bovine CL, especially at the early luteal stage as an autocrine/paracrine regulator.
authors.affiliation: Reproductive Biology Research Unit, National Institute of Agrobiological Sciences, Ibaraki, Japan. sakumoto@affrc.go.jp
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Sakumoto
authors.forename: Margarete
authors.initials: M
authors.lastname: Vermehren
authors.forename: Rebecca A-M
authors.initials: RA
authors.lastname: Kenngott
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Okuda
authors.forename: Fred
authors.initials: F
authors.lastname: Sinowatz
mesh_terms: D000818:Animals; D019898:Autocrine Communication / Q000502:physiology; D002417:Cattle / Q000502:physiology*; D003338:Corpus Luteum / Q000502:physiology*; D042783:Endothelial Cells / Q000502:physiology; D030762:Estrous Cycle / Q000502:physiology*; D005260:Female; D015870:Gene Expression / Q000502:physiology; D007150:Immunohistochemistry; D019899:Paracrine Communication / Q000502:physiology; D012333:RNA, Messenger / Q000378:metabolism; D011980:Receptors, Progesterone / Q000235:genetics* / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D012333:RNA, Messenger; D011980:Receptors, Progesterone