Publications by authors named "Ricardo Coletti"

Article Synopsis
  • Nitric oxide (NO) inhibits the secretion of vasopressin (AVP), oxytocin (OT), and atrial natriuretic peptide (ANP) when extracellular osmolality rises, while carbon monoxide (CO) and hydrogen sulfide (H₂S) enhance this secretion.
  • The study used an ex vivo model from male rats to test how these gases interact under hypertonic conditions, specifically looking at various chemical donors and inhibitors.
  • Results showed that while NO negatively regulates hormonal release and affects other gas production in the hypothalamus, CO and H₂S primarily act to boost the secretion of these hormones, highlighting NO's critical role in the neuroendocrine response to osmotic changes
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Leptin is a permissive factor for puberty initiation, participating as a metabolic cue in the activation of the kisspeptin (Kiss1)-gonadotropin-releasing hormone neuronal circuitry; however, it has no direct effect on Kiss1 neurons. Leptin acts on hypothalamic cocaine- and amphetamine-regulated transcript (CART) neurons, participating in the regulation of energy homeostasis. We investigated the influence of a short-term high-fat diet (HFD) on the effect of leptin on puberty timing.

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The Na-K-2Cl cotransporter 2 (NKCC2) was thought to be kidney specific. Here we show expression in the brain hypothalamo-neurohypophyseal system (HNS), wherein upregulation follows osmotic stress. The HNS controls osmotic stability through the synthesis and release of the neuropeptide hormone, arginine vasopressin (AVP).

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Nitric oxide (NO), carbon monoxide (CO), and hydrogen sulfide (H2S) are gaseous molecules produced by the brain. Within the hypothalamus, gaseous molecules have been highlighted as autocrine and paracrine factors regulating endocrine function. Therefore, in the present review, we briefly discuss the main findings linking NO, CO, and H2S to the control of body fluid homeostasis at the hypothalamic level, with particular emphasis on the regulation of neurohypophyseal system output.

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