In vivo release of somatostatin from rat median eminence after local K+ infusion or delivery of nociceptive stress.
The effects of local infusion of a 16 mM K+ solution or of a nociceptive stress on the release of somatostatin (SRIF) from the hypothalamus was measured in unanesthetized male rats implanted with a push-pull cannula in the median eminence. Although the baseline secretion rate of SRIF was increased in animals displaying agitation as a result of handling stress, both treatments induced fast doubling of SRIF release lasting for 15-30 min. Neither an equimolar Na+ infusion into the median eminence nor a similar K+ infusion into the 3rd ventricle had any affect on this release. The possible role of SRIF release in the mechanism of growth hormone inhibition following nociceptive stress is discussed.
D000818:Animals; D007276:Injections, Intraventricular; D008297:Male; D008473:Median Eminence / Q000378:metabolism*; D010146:Pain / Q000378:metabolism*; D011188:Potassium / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D012964:Sodium / Q000494:pharmacology; D013004:Somatostatin / Q000378:metabolism*
D013004:Somatostatin; D012964:Sodium; D011188:Potassium