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Hypoxia induces oxytocin release in the rat
1Department of Biology, Zhejiang University, Hangzhou 310027, P.R. China. dujz@mail.hz.zj.cn
Neuro Endocrinology Letters
|July 18, 2001
Summary
Acute hypoxia triggers oxytocin (OXT) release in the median eminence (ME) of male rats, modulated by glucocorticoids. Chronic hypoxia showed no significant effect on OXT levels.
Area of Science:
- Neuroendocrinology
- Physiology
Background:
- Oxytocin (OXT) plays a crucial role in various physiological processes.
- The median eminence (ME) is a key neuroendocrine site regulating hormone release.
Purpose of the Study:
- To investigate the effect of acute and chronic hypoxia on OXT release in the ME of male rats.
- To explore the role of glucocorticoids in modulating hypoxia-induced OXT release.
Main Methods:
- Hypoxia was induced using a hypobaric chamber in adult male rats.
- Studies included acute and chronic hypoxia exposure, bilateral adrenalectomy (ADX), and dexamethasone (DEX) administration.
Main Results:
- Acute hypoxia caused an intensity- and duration-dependent OXT release in the ME.
- Chronic hypoxia (5-25 days) did not significantly alter ME OXT levels.
- ADX decreased ME OXT levels, and hypoxia had no further effect. DEX partially reversed this decrease.
Conclusions:
- Acute hypoxia stimulates OXT release in the ME.
- Glucocorticoids, potentially activated by hypoxia, modulate this OXT release.
- Hypoxia-activated glucocorticoids may influence OXT release via negative feedback on CRH.