Effects of amylin-related peptides on food intake, meal patterns, and gastric emptying in rats.
We previously demonstrated that amylin inhibits food intake and gastric emptying in rats with half-maximal effective doses (ED(50)s) of 8 and 3 pmol x kg(-1) x min(-1) and maximal inhibitions of 78 and 60%, respectively. In this study of identical design, rats received intravenous infusions of salmon calcitonin (sCT), rat calcitonin (rCT), rat calcitonin gene-related peptide (rCGRP), and rat adrenomedullin (rADM) for 3 h at dark onset, and food intake was measured for 17 h or for 15 min and gastric emptying of saline was measured during the final 5 min. sCT, rCGRP, and rADM inhibited food intake with estimated ED(50)s of 0.5, 26, and 35 pmol x kg(-1) x min(-1) and maximal inhibitions of 88, 90, and 49%, respectively. rCT was not effective at doses up to 100 pmol x kg(-1) x min(-1). sCT, rCGRP, rADM, and rCT inhibited gastric emptying with ED(50)s of 1, 130, 160, and 730 pmol x kg(-1) x min(-1) and maximal inhibitions of 60, 66, 60, and 33%, respectively. These results suggest that amylin and sCT may act by a common mechanism to decrease food intake, which includes inhibition of gastric emptying.
Reidelberger
Roger D
RD
Veterans Administration Medical Center, Omaha 68105, USA.
Kelsey
Linda
L
Heimann
Dean
D
D053607:Adrenomedullin; D000818:Animals; D002116:Calcitonin / Q000494:pharmacology*; D015740:Calcitonin Gene-Related Peptide / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004435:Eating / Q000187:drug effects*; D005247:Feeding Behavior / Q000187:drug effects*; D005746:Gastric Emptying / Q000187:drug effects*; D007275:Injections, Intravenous; D008297:Male; D010455:Peptides / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012474:Salmon
D010455:Peptides; D053607:Adrenomedullin; D002116:Calcitonin; D015740:Calcitonin Gene-Related Peptide