Multidrug resistance gene expression correlates with progesterone production in dehydroepiandrosterone-induced polycystic and equine chorionic gonadotropin-stimulated ovaries of prepubertal rats

G. Y. Lee, James Croop, E. Anderson

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Polycystic ovaries (PCO) can be induced in prepubertal rats by daily injection of dehydroepiandrosterone (DHEA). There are high levels of progesterone, androgens, and estrogens in the cystic fluid of DHEA-treated rat ovaries. The purpose of this study was to investigate whether high levels of steroids in the PCO correlate with the expression of multidrug resistance gene product P-glycoprotein (Pgp). Using C219, a monoclonal antibody that recognizes the 170-kDa ATP-dependent transmembrane pump, we localized Pgp on the plasma membrane of granulosa cells in cystic follicles but not of oocytes or thecal/interstitial cells. In normal prepubertal rats, Pgp was localized in progesterone-producing granulosa cells of the preovulatory follicles and in cells of the corpora lutea after eCG/hCG stimulation, but not in growing follicles, oocytes, or thecal/interstitial cells. Northern analysis of these tissues indicated strong expression of Pgp mRNA i the preovulatory follicles, cystic follicles, and corpora lutea. From these findings it seems that progesterone produced by the granulosa cells may act in an autocrine manner to induce the expression of Pgp. It may be possible that proegesterone interacts with the Pgp of these granulosa cells to modulate steroid efflux.

Original languageEnglish (US)
Pages (from-to)330-337
Number of pages8
JournalBiology of Reproduction
Volume58
Issue number2
DOIs
StatePublished - Feb 1998
Externally publishedYes

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Equine Gonadotropins
MDR Genes
Dehydroepiandrosterone
P-Glycoprotein
Chorionic Gonadotropin
Progesterone
Ovary
Granulosa Cells
Gene Expression
Corpus Luteum
Oocytes
Steroids
Androgens
Estrogens
Adenosine Triphosphate
Monoclonal Antibodies
Cell Membrane
Messenger RNA
Injections

ASJC Scopus subject areas

  • Cell Biology
  • Developmental Biology
  • Embryology

Cite this

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abstract = "Polycystic ovaries (PCO) can be induced in prepubertal rats by daily injection of dehydroepiandrosterone (DHEA). There are high levels of progesterone, androgens, and estrogens in the cystic fluid of DHEA-treated rat ovaries. The purpose of this study was to investigate whether high levels of steroids in the PCO correlate with the expression of multidrug resistance gene product P-glycoprotein (Pgp). Using C219, a monoclonal antibody that recognizes the 170-kDa ATP-dependent transmembrane pump, we localized Pgp on the plasma membrane of granulosa cells in cystic follicles but not of oocytes or thecal/interstitial cells. In normal prepubertal rats, Pgp was localized in progesterone-producing granulosa cells of the preovulatory follicles and in cells of the corpora lutea after eCG/hCG stimulation, but not in growing follicles, oocytes, or thecal/interstitial cells. Northern analysis of these tissues indicated strong expression of Pgp mRNA i the preovulatory follicles, cystic follicles, and corpora lutea. From these findings it seems that progesterone produced by the granulosa cells may act in an autocrine manner to induce the expression of Pgp. It may be possible that proegesterone interacts with the Pgp of these granulosa cells to modulate steroid efflux.",
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