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Oxytocin levels in response to CRH administration in hypopituitarism and hypothalamic damage: a randomized, crossover, placebo-controlled trial.
Sci Rep
January 2025
Department of Endocrinology and Nutrition, Hospital de la Santa Creu i Sant Pau, IR-SANT PAU, CIBERER-U747 ISCIII, ENDO-ERN, Barcelona, Spain.
Increasing evidence supports the presence of oxytocin deficiency (OXT-D) in patients with hypopituitarism and hypothalamic damage (HHD), that might be associated with neuropsychological deficits and sexual dysfunction, leading to worse quality of life (QoL). Therefore, identifying a provocative test to diagnose an OXT-D will be important. Corticotropin-releasing hormone (CRH) is a candidate for such a test as it increases oxytocin secretion in animal models.
View Article and Find Full Text PDFOxytocin and Neuroscience of Lactation: Insights from the Molecular Genetic Approach.
Neurosci Res
January 2025
RIKEN Center for Biosystems Dynamics Research, 2-2-3 Minatojima Minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan. Electronic address:
In mammals, lactation is essential for the health and growth of infants and supports the formation of the mother-infant bond. Breastfeeding is mediated by the neurohormone oxytocin (OT), which is released into the bloodstream in a pulsatile manner from OT neurons in the hypothalamus to promote milk ejection into mammary ducts. While classical studies using anesthetized rats have illuminated the activity patterns of putative OT neurons during breastfeeding, the molecular, cellular, and neural circuit mechanisms driving the synchronous pulsatile bursts of OT neurons in response to nipple stimulation remain largely elusive.
View Article and Find Full Text PDFFood intake and the HPT axis in the cichlid fish: The implications of the gut-brain peptide cholecystokinin.
Comp Biochem Physiol A Mol Integr Physiol
January 2025
Neuroendocrinology Research Laboratory, Department of Studies in Zoology, Karnatak University, Dharwad 580 003, India. Electronic address:
This work aimed to investigate the response of cholecystokinin (CCK) to starvation and its impact on food intake and the reproductive axis of the tilapia Oreochromis mossambicus. The fish subjected to 21 days of starvation showed a significant decrease in CCK immunoreactivity in the hypothalamus, pituitary gland, and intestine. The administration of injections of 0.
View Article and Find Full Text PDFKisspeptin and Neurokinin B: roles in reproductive health.
Physiol Rev
January 2025
Department of Investigative Medicine, Imperial College London, Hammersmith Hospital, London, United Kingdom.
Kisspeptin and neurokinin B (NKB) play a key role in several physiological processes including in puberty, adult reproductive function including the menstrual cycle, as well as mediating the symptoms of menopause. Infundibular kisspeptin neurons, which co-express NKB, regulate the activity of gonadotropin releasing hormone (GnRH) neurons, and thus the physiological pulsatile secretion of GnRH from the hypothalamus. Outside of their hypothalamic reproductive roles, these peptides are implicated in several physiological functions including sexual behavior and attraction, placental function, and bone health.
View Article and Find Full Text PDFIntranasal delivery of a ghrelin mimetic engages the brain ghrelin signalling system in mice.
Endocrinology
January 2025
Department of Physiology/Endocrine, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg, Sweden.
Ghrelin, the endogenous ligand of the growth hormone secretagogue receptor (GHSR), promotes food intake, other feeding behaviours and stimulates growth hormone (GH) release from the pituitary. Growth hormone secretagogues (GHS), such as GHRP-6 and MK-0677, are synthetic GHSR ligands that activate orexigenic Neuropeptide Y neurons that co-express Agouti-Related Peptide (AgRP) in the arcuate nucleus of the hypothalamus when administered systemically. Systemic GHRP-6 also stimulates GH release in humans and rats.
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