A novel reproductive peptide was recently described and named Phoenixin (PHXN). The novel neuropeptide PHXN, discovered in 2013 by Yosten et al., and its receptor, GPR173, were identified in magnocellular neurons of the paraventricular nucleus (PVN) and supraoptic nucleus (SON) suggesting a functional importance of PHXN on the control of the hydromineral homeostasis and a modulation on the hypothalamo-neurohypophysial system. In fact, previous studies from Yosten and Samson group showed that PHXN induces a significant vasopressin (AVP) but not oxytocin (OT) release in hypothalamo-neurohypophyseal explants and in conscious, unrestrained male rats. However, the mechanisms involved in AVP release induced by PHXN are unknown. Therefore, this study aims to investigate new mechanisms by which PHNX controls neurohypohyseal hormone release in response osmotic or hypovolemic stimuli. The elucidation of PHXN mechanisms related to neurohypophyseal release can provide important insights of its role in the modulation of hydromineral homeostasis, enhancing the knowledge of non-reproductive PHXN actions under physiological and pathophysiological conditions such as dehydration and hypovolemia.
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