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Journal of Clinical Endocrinology & Metabolism, Vol 80, 430-434, Copyright © 1995 by Endocrine Society

ARTICLES

Gonadotropin-releasing hormone receptor gene expression in human ovary and granulosa-lutein cells

D Minaretzis, M Jakubowski, JF Mortola and SN Pavlou
Department of Obstetrics, Gynecology, Beth Israel Hospital, Harvard Medical School, Boston, Massachusetts 02215.

GnRH regulates gonadotropin biosynthesis and release in the anterior pituitary via specific receptors. Although extrapituitary expression and action of GnRH have been shown in some species, in the human it is not clear whether GnRH has a peripheral action. In this study we sought to determine whether the human ovary expresses GnRH receptor (GnRHR) messenger ribonucleic acid (mRNA). Ovarian tissues from 11 women (32-61 yr old) and granulosa-lutein (GL) cells purified from follicular aspirates of 51 women undergoing oocyte retrieval for in vitro fertilization were analyzed by ribonuclease protection assay and reverse transcriptase-polymerase chain reaction (RT-PCR). Human pituitaries, lymphocytes, and placenta were also studied. Measurable levels of GnRHR mRNA were found by ribonuclease protection assay in 2 of 10 ovaries, in 2 of 4 GL cells preparations from women whose ovarian hyperstimulation involved a GnRH agonist, in GL cells from 3 women whose ovarian hyperstimulation involved a GnRH antagonist, and in human pituitaries. Relative to the total amount of RNA analyzed, the level of GnRHR mRNA was about 200-fold lower in the ovary than in the pituitary. A sequence of 314 basepairs of GnRHR mRNA was amplified by RT-PCR in the pituitary, in 9 of 10 ovaries, and in 4 of 5 GL cell preparations. No message could be amplified in human lymphocytes, and placental specimens showed a weak signal. The relative GnRHR mRNA levels in GL cells from 13 women analyzed by quantitative RT-PCR showed a wide range of individual differences. These results suggest that GnRHR mRNA is expressed in GL cells and the human ovary across different functional stages, implying that multiple ovarian compartments may express GnRH receptors. The administration of GnRH analogs may have a further direct action on the human ovary.


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