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Immunohistochemical Study of Steroidogenesis, Proliferation, and Hypoxia-related Proteins in Caprine Corpora Lutea during the Estrous Cycle
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 Title & Authors
Immunohistochemical Study of Steroidogenesis, Proliferation, and Hypoxia-related Proteins in Caprine Corpora Lutea during the Estrous Cycle
Chiu, C.H.; Srinivasan, R.; Tseng, T.H.; Chuang, R.F.; Wu, L.S.;
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The corpus luteum (CL) is a transient endocrine gland that produces progesterone, a product required for the establishment and maintenance of pregnancy. In the absence of pregnancy, the production of progesterone in the CL decreases and the structure itself regresses in size. The life span and function of the CL are regulated by complex interactions between stimulatory (luteotrophic) and inhibitory (luteolytic) mediators. When an ovum is released from a mature follicle, angiogenesis and rapid growth of follicular cells form the CL. The purpose of the present study was to determine whether steroidogenesis, proliferation, and hypoxiarelated proteins are expressed in caprine CL. The expression of proliferating cell nuclear antigen (PCNA), vascular endothelial growth factor (VEGF), and hypoxia-inducible factor (HIF-) were determined in caprine CL during the estrous cycle. Cytochrome P450 side chain cleavage protein did not vary significantly during the estrous cycle; however, there was an increased expression of -hydroxysteroid dehydrogenase in the early and middle stages, which rapidly decreased in the late stage. The same observations were made with respect to steroidogenic acute regulatory protein. Variations in progesterone content and expression of PCNA, HIF-, and VEGF were consistent with this result. Thus, the steroidogenic proteins, PCNA, HIF-, and VEGF in caprine CL are dependent on the stage of the estrous cycle.
Caprine;Corpus Luteum;Steroidogenesis;Hypoxia;Immunohistochemistry;
 Cited by
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