Animal cells and systems

The Korean Society for Integrative Biology (한국통합생물학회)
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Expression and Regulation of Gonadotropin-Releasing Hormone(GnRH) and Its Receptor mRNA Transcripts During the Mouse Ovarian Development

  • Shim, Chanseob (School of Biological Sciences, Seoul National University) ;
  • Khang, Inkoo (School of Biological Sciences, Seoul National University) ;
  • Lee, Kyung-Ah (College of Medicine, Pochon Cha University, and Infertility Medical Center, Cha General Hospital) ;
  • Kim, Kyungjin (College of Medicine, Pochon Cha University, and Infertility Medical Center, Cha General Hospital)
  • Published : 2001.09.01
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Abstract

The present study examines the expression and regulation of gonadotropin-releasing hormone (GnRH) and its receptor (GnRH-R) mRNA levels during mouse ovarian development. A fully processed, mature GnRH mRNA together with intron-containing primary transcripts was expressed in the immature mouse ovary as determined by Northern blot analysis and reverse transcription-polymerase chain reaction (RT-PCR). The size of ovarian GnRH mRNA was similar to that of hypothalamus, but its amount was much lower than that in the hypothalamus. Quantitative RT-PCR procedure also revealed the expression of GnRH-R mRNA in the ovary, but the estimated amount was a thousand-fold lower than that in the pituitary gland. We also examined the regulation of ovarian GnRH and GnRH-R mRNA levels during the follicular development induced by pregnant mare's serum gonadotropin (PMSG) and/or human chorionic gonadotropin (hCG). Ovarian luteinizing hormone receptor (LH-R) mRNA was abruptly increased st 48 h after the PMSG administration and rapidly decreased to the basal level thereafter. Ovarian GnRH mRNA level was slightly decreased at 48 h after the PMSG administration, and then returned to the basal value. GnRH-R mRNA level began to increase at 24 h after the PMSG treatment, decreased below the uninduced basal level at 48 h, and gradually increased thereafter. HCG administration did not alter ovarian GnRH mRNA level, while it blocked the PMSG-induced increase in GnRH mRNA level. Taken together, the present study demonstrates that the expression of GnRH and GnRH-R mRNA are regulated by gonadotropin during follicular development, suggesting possible intragonadal paracrine roles of GnRH and GnRH-R in the mouse ovarian development.

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References

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