{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,28]],"date-time":"2026-06-28T09:35:45Z","timestamp":1782639345349,"version":"3.54.5"},"reference-count":54,"publisher":"Wiley","issue":"16","license":[{"start":{"date-parts":[[2008,8,18]],"date-time":"2008-08-18T00:00:00Z","timestamp":1219017600000},"content-version":"vor","delay-in-days":3,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Journal of Physiology"],"published-print":{"date-parts":[[2008,8,15]]},"abstract":"<jats:p>Although the fetal pineal gland does not secrete melatonin, the fetus is exposed to melatonin of maternal origin. In the non\u2010human primate fetus, melatonin acts as a trophic hormone for the adrenal gland, stimulating growth while restraining cortisol production. This latter physiological activity led us to hypothesize that melatonin may influence some fetal functions critical for neonatal adaptation to extrauterine life. To test this hypothesis we explored (i) the presence of G\u2010protein\u2010coupled melatonin binding sites and (ii) the direct modulatory effects of melatonin on noradrenaline (norepinephrine)\u2010induced middle cerebral artery (MCA) contraction, brown adipose tissue (BAT) lypolysis and ACTH\u2010induced adrenal cortisol production in fetal sheep. We found that melatonin directly inhibits the response to noradrenaline in the MCA and BAT, and also inhibits the response to ACTH in the adrenal gland. Melatonin inhibition was reversed by the melatonin antagonist luzindole only in the fetal adrenal. MCA, BAT and adrenal tissue displayed specific high\u2010affinity melatonin binding sites coupled to G\u2010protein (<jats:italic>K<\/jats:italic><jats:sub>d<\/jats:sub> values: MCA 64 \u00b1 1 p<jats:sc>m<\/jats:sc>, BAT 98.44 \u00b1 2.12 p<jats:sc>m<\/jats:sc> and adrenal 4.123 \u00b1 3.22 p<jats:sc>m<\/jats:sc>). Melatonin binding was displaced by luzindole only in the adrenal gland, supporting the idea that action in the MCA and BAT is mediated by different melatonin receptors. These direct inhibitory responses to melatonin support a role for melatonin in fetal physiology, which we propose prevents major contraction of cerebral vessels, restrains cortisol release and restricts BAT lypolysis during fetal life.<\/jats:p>","DOI":"10.1113\/jphysiol.2008.154351","type":"journal-article","created":{"date-parts":[[2008,7,4]],"date-time":"2008-07-04T00:34:16Z","timestamp":1215131656000},"page":"4017-4027","source":"Crossref","is-referenced-by-count":73,"title":["Evidence of a role for melatonin in fetal sheep physiology: direct actions of melatonin on fetal cerebral artery, brown adipose tissue and adrenal gland"],"prefix":"10.1113","volume":"586","author":[{"given":"Claudia","family":"Torres\u2010Farfan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francisco 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