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Multiple rapid progestin actions and progestin membrane receptor subtypes in fish
Peter Thomas1, Yefei Pang, Yong Zhu
1University of Texas at Austin Marine Science Institute, 750 Channel View Drive, Port Aransas, TX 78373, USA. thomas@utmsi.utexas.edu
Steroids
|August 4, 2004
Summary
Progestin hormones rapidly influence fish reproduction through membrane receptors (mPRs). Research shows mPR subtypes, particularly mPRalpha, play key roles in regulating sperm motility and hormone secretion for maturation.
Area of Science:
- Endocrinology
- Reproductive Biology
- Fish Physiology
Background:
- Progestins rapidly influence fish reproduction via nongenomic actions, mediated by progestin membrane receptors (mPRs).
- mPRs are crucial for oocyte maturation and sperm motility in fish.
- Progestins also rapidly affect the hypothalamus, down-regulating gonadotropin-releasing hormone (GnRH) secretion.
Purpose of the Study:
- To investigate the role of mPR subtypes in mediating rapid progestin actions in fish reproduction.
- To characterize the tissue distribution and function of mPR subtypes, specifically mPRalpha and mPRbeta.
Main Methods:
- Cloning, sequencing, and characterization of a novel mPR cDNA in spotted seatrout.
- Analysis of tissue distribution of mPRalpha protein in seatrout.
- mPRbeta antisense experiments in zebrafish oocytes.
Main Results:
- Identification of three distinct mPR subtypes (alpha, beta, gamma) in fish and mammals.
- Seatrout mPRalpha protein distribution suggests its involvement in GnRH secretion, sperm motility, and oocyte maturation.
- Zebrafish mPRbeta may also regulate oocyte maturation.
Conclusions:
- mPR subtypes exhibit diverse roles in fish reproductive physiology.
- mPRalpha is a key mediator of rapid progestin actions in fish reproduction.
- Further research is needed to fully elucidate the specific functions of each mPR subtype.