hCG-induced down-regulation of PPARγ and liver X receptors promotes periovulatory progesterone synthesis by macaque granulosa cells

Muraly Puttabyatappa, Catharine A. VandeVoort, Charles L. Chaffin

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

An ovulatory stimulus induces the rapid and dramatic increase in progesterone synthesis by the primate ovarian follicle. However, little is known about the early events leading to the shift from estrogen to progesterone production. Because steroidogenesis represents an aspect of cholesterol metabolism, it was hypothesized that transcription factors regulating cholesterol balance would be among the earliest to change in response to an ovulatory stimulus. Granulosa cells were isolated from rhesus monkey follicles following controlled ovarian stimulation protocols before or up to 24 hr after an ovulatory human chorionic gonadotropin (hCG) bolus. The peroxisome proliferator-activated receptor-γ (PPARG) and the liver X receptors [nuclear receptor (NR)1H2, NR1H3] decreased within 3 hr of hCG, as did the reverse cholesterol transporters ATP-binding cassette (ABC)A1 and ABCG1. Treatment of granulosa cells isolated before an ovulatory stimulus with hCG and rosiglitizone resulted in an increase in NR1H3 and ABCG1, and decreased steroidogenic acute regulatory (STAR) protein and scavenger receptor-BI (SCARB1). A liver X receptor agonist attenuated hCG-induced progesterone synthesis in vitro and increased the expression of ABCA1 and ABCG1, and suppressed STAR, P450 side-chain cleavage A1, hydroxysteroid dehydrogenase 3B, and SCARB1. These data suggest that an initial action of LH/CG on the primate preovulatory follicle is to rapidly reduce the expression of PPARG, resulting in reduced NR1H3 with the consequence shifting the balance from cholesterol efflux via ABCA1 and ABCG1 to cholesterol uptake (SCARB1) and metabolism (STAR, P450 side-chain cleavage A1, hydroxysteroid dehydrogenase 3B). That the regulation of PPARG and the liver X receptors occurs within 3 hr strongly indicates that early events in the primate luteinizing follicle are critical to successful ovulation and luteal formation.

Original languageEnglish (US)
Pages (from-to)5865-5872
Number of pages8
JournalEndocrinology
Volume151
Issue number12
DOIs
StatePublished - Dec 2010

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Peroxisome Proliferator-Activated Receptors
Granulosa Cells
Macaca
Chorionic Gonadotropin
Progesterone
Down-Regulation
Cholesterol
Primates
Hydroxysteroid Dehydrogenases
Scavenger Receptors
Ovarian Follicle
ATP-Binding Cassette Transporters
Ovulation Induction
Corpus Luteum
Cytoplasmic and Nuclear Receptors
Ovulation
Macaca mulatta
Estrogens
Transcription Factors
Liver X Receptors

ASJC Scopus subject areas

  • Endocrinology

Cite this

hCG-induced down-regulation of PPARγ and liver X receptors promotes periovulatory progesterone synthesis by macaque granulosa cells. / Puttabyatappa, Muraly; VandeVoort, Catharine A.; Chaffin, Charles L.

In: Endocrinology, Vol. 151, No. 12, 12.2010, p. 5865-5872.

Research output: Contribution to journalArticle

Puttabyatappa, Muraly ; VandeVoort, Catharine A. ; Chaffin, Charles L. / hCG-induced down-regulation of PPARγ and liver X receptors promotes periovulatory progesterone synthesis by macaque granulosa cells. In: Endocrinology. 2010 ; Vol. 151, No. 12. pp. 5865-5872.
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