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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Oxytocinergic circuit from paraventricular and supraoptic nuclei to arcuate POMC neurons in hypothalamus.
FEBS Letters 2014 November 29
Intracerebroventricular injection of oxytocin (Oxt), a neuropeptide produced in hypothalamic paraventricular (PVN) and supraoptic nuclei (SON), melanocortin-dependently suppresses feeding. However, the underlying neuronal pathway is unclear. This study aimed to determine whether Oxt regulates propiomelanocortin (POMC) neurons in the arcuate nucleus (ARC) of the hypothalamus. Intra-ARC injection of Oxt decreased food intake. Oxt increased cytosolic Ca(2+) in POMC neurons isolated from ARC. ARC POMC neurons expressed Oxt receptors and were contacted by Oxt terminals. Retrograde tracer study revealed the projection of PVN and SON Oxt neurons to ARC. These results demonstrate the novel oxytocinergic signaling from PVN/SON to ARC POMC, possibly regulating feeding.
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