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1 May 2004 Acquisition of Luteolytic Capacity: Changes in Prostaglandin F Regulation of Steroid Hormone Receptors and Estradiol Biosynthesis in Pig Corpora Lutea
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Abstract

The pig corpora lutea (CL) acquires luteolytic capacity at about Day 13 of the estrous cycle, after which luteolysis occurs in response to prostaglandin F (PGF) treatment. We postulated that differences in transcription factors such as the steroid hormone receptors may be responsible for the differences in PGF-induced gene expression after acquisition of luteolytic capacity. In these studies, we evaluated the effect of PGF on luteal expression of receptors for progesterone (nuclear and membrane progesterone receptor [PR]), estradiol (ERα and ERβ), glucocorticoid, androgens, and two enzymes in estradiol synthesis (P450-17α and aromatase). Two experiments were conducted to examine the early (0.5 h, experiment I) and late (10 h, experiment II) effects of PGF on the expression of these receptors in CL with (Day 17) or without (Day 9) luteolytic capacity. PGF decreased ERα mRNA (35%) and increased ERβ mRNA (558%) and protein (376%) only in Day 17 CL and not Day 9. The estradiol biosynthetic pathway was upregulated by PGF in Day 17 CL but not Day 9 CL, with a dramatic increase in aromatase mRNA and luteal estradiol content. Nuclear PR was not affected by PGF, but was greater (176%) in Day 9 CL, while a putative membrane PR was greater (156%) in Day 17 than Day 9 CL. There were no detectable changes in glucocorticoid or androgen receptor mRNA. Thus, luteolytic capacity is associated with upregulation of estradiol biosynthesis, which in conjunction with increased ERβ expression and altered PR expression may promote luteolysis in the pig CL.

Francisco J. Diaz and Milo C. Wiltbank "Acquisition of Luteolytic Capacity: Changes in Prostaglandin F Regulation of Steroid Hormone Receptors and Estradiol Biosynthesis in Pig Corpora Lutea," Biology of Reproduction 70(5), 1333-1339, (1 May 2004). https://doi.org/10.1095/biolreprod.103.020461
Received: 18 June 2003; Accepted: 1 December 2003; Published: 1 May 2004
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