Reproduction, Fertility and Development Reproduction, Fertility and Development Society
Vertebrate reproductive science and technology

Regulation of protein tyrosine phosphatase 4a1, B-cell translocation gene 2, nuclear receptor subfamily 4a1 and diacylglycerol O-acyltransferase 1 by follicle stimulating hormone in the rat ovary

Jonathan Schmidt A , Jeanene de Avila A and Derek McLean A B

A Department of Animal Sciences and Center for Reproductive Biology, Washington State University, Pullman, WA 99164, USA.

B Corresponding author. Email:

Reproduction, Fertility and Development 18(7) 757-765
Submitted: 20 December 2005  Accepted: 28 May 2006   Published: 28 August 2006


Ovarian response to follicle stimulating hormone (FSH) and luteinising hormone (LH) leads to the formation of a mature follicle that is eventually ovulated. FSH and LH are essential for this process because they direct changes in somatic cells associated with folliculogenesis by regulating the expression of multiple genes. We hypothesised that genes induced by FSH in rat Sertoli cells would also show hormonal regulation during rat folliculogenesis. The objective of this study was to determine the expression patterns of diacylglycerol O-acyltransferase 1 (Dgat1), nuclear receptor subfamily 4a1 (Nr4a1), an anti-proliferative gene (Btg2) and a protein tyrosine phosphatase (Ptp4a1) in the ovaries of pregnant mare serum gonadotrophin (PMSG)-treated and human chorionic gonadotrophin (hCG)-treated rats. Expression of Dgat1, Nr4a1 and Ptp4a1 was induced in ovaries 4 h post PMSG treatment. When rats were treated with hCG, Dgat1, Nr4a1 and Ptp4a1 expression was induced by 12 h. Expression of Nr4a1 protein increases 12–24 h after induction of gene expression. Nr4a1 protein was observed in the granulosa, theca and luteal cells post PMSG and hCG treatment. These findings should increase our knowledge of mechanisms regulating folliculogenesis and luteinisation and demonstrate the diverse proteins that are important in ovarian function.


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