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Intracellular signaling in the gonads
1Department of Obstetrics and Gynecology, University of British Columbia, Vancouver, Canada.
Endocrine Reviews
|August 1, 1992
Summary
Steroidogenesis in ovaries and testes is complex, involving multiple hormones and signaling pathways. Understanding these pathways, including gonadotropins and local factors, is crucial for reproductive health.
Area of Science:
- Reproductive Endocrinology
- Molecular Endocrinology
- Cell Signaling
Background:
- Steroidogenesis in the gonads (ovary and testis) is intricately regulated by hormones and intracellular signaling.
- Recent cloning of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) receptors enhances understanding of their mechanisms.
- LH plays a dominant role, potentially involving multiple signaling pathways beyond the adenylate cyclase-cAMP system stimulated by FSH.
Purpose of the Study:
- To review current understanding of intracellular signaling mechanisms regulating gonadal steroidogenesis.
- To discuss the roles of various local factors and their receptors in modulating steroid production.
- To highlight the complexity arising from multiple signaling pathways and cross-talk.
Main Methods:
- Review of existing literature on gonadal steroidogenesis and intracellular signaling pathways.
- Analysis of the roles of specific signaling molecules like GnRH, PGF2 alpha, Ang II, and others.
- Examination of the involvement of phospholipase pathways (PLC, PLA2, PLD).
Main Results:
- LH utilizes multiple intracellular signaling pathways, including adenylate cyclase-cAMP and potentially phospholipase C (PLC).
- Numerous local factors (e.g., GnRH, PGF2 alpha, Ang II, EGF) modulate steroidogenesis, acting independently or in concert with gonadotropins.
- These factors can act via autocrine, paracrine, and intracrine mechanisms, influencing gonadal responses.
- Evidence suggests single hormones can activate multiple signaling pathways, and cross-talk between pathways is common.
Conclusions:
- Gonadal steroidogenesis is regulated by a complex interplay of gonadotropins and local factors through diverse intracellular signaling cascades.
- Understanding these complex signaling networks, including pathway cross-talk, is essential for comprehending reproductive function and dysfunction.
- Further research is needed to elucidate the precise mechanisms of novel gonadal regulators and their signaling pathways.