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Nutritional inputs into the reproductive neuroendocrine control system--a multidimensional perspective.
D Blache1, L M Chagas, G B Martin
1School of Animal Biology, M085, Faculty of Natural and Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia. dbla@animals.uwa.edu.au
Society of Reproduction and Fertility Supplement
|May 12, 2007
Summary
Metabolic status powerfully regulates reproductive function by influencing the hypothalamic gonadotropin-releasing hormone (GnRH) and luteinizing hormone (LH) secretion system. Evolution has shaped this system to minimize reproductive risks, incorporating nutrient sensing and metabolic memory.
Area of Science:
- Reproductive endocrinology
- Evolutionary biology
- Metabolic regulation
Background:
- Metabolic status, reflecting nutrient and energy availability, is a key regulator of reproductive function.
- The hypothalamic control of pulsatile gonadotropin-releasing hormone (GnRH) and luteinizing hormone (LH) secretion is central to reproduction.
- Evolutionary pressures have shaped regulatory systems to optimize reproductive success in variable environments.
Purpose of the Study:
- To review the relationship between metabolic status and GnRH/LH secretion.
- To present a model of reproductive regulation encompassing genetic, structural, communicational, and temporal dimensions.
- To explore how evolved mechanisms minimize reproductive risks.
Main Methods:
- Literature review of metabolic status and reproductive neuroendocrine control.
- Development of a four-dimensional model (genetic, structural, communicational, temporal).
- Illustration using examples from male sheep and postpartum dairy cows.
Main Results:
- Metabolic status significantly impacts the GnRH and LH secretory system.
- A four-dimensional framework helps understand evolved reproductive regulation.
- Concepts of 'metabolic memory' and 'nutrient sensing' are crucial for the temporal dimension.
Conclusions:
- Evolved regulatory pathways ensure animals make the least risky reproductive decisions.
- Understanding metabolic influences on reproduction is vital for animal health and productivity.
- Further research can elucidate the precise evolutionary pathways governing reproductive decisions.
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