5-HT and carbohydrate suppression: effects of 5-HT antagonists on the action of d-fenfluramine and DOI.
The effects of several 5-hydroxytryptamine (5-HT) receptor antagonists on the anorectic effect of d-fenfluramine and the 5-HT2/5-HT1C agonist 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI) were examined in a dietary paradigm that appears to be sensitive to 5-HT-induced carbohydrate suppression. In this paradigm, deprived rats are provided with a nutritionally complete hydrated chow mash diet together with an optional carbohydrate supplement of powdered Polycose. Both d-fenfluramine and DOI produced a clear suppression of total energy intake and carbohydrate (Polycose) intake. However, the mechanisms underlying these effects are different. The effect of d-fenfluramine in this paradigm was attenuated by the 5-HT1/5-HT2 receptor antagonist metergoline and partially attenuated by the 5-HT1A/5-HT1B receptor antagonist (+/-)cyanopindolol. In contrast, d-fenfluramine's effect was not antagonised by the 5-HT2 receptor antagonist ketanserin, the 5-HT3 receptor antagonist (3 alpha-tropanyl)-1H-indole-3-carboxylic acid ester (ICS-205,930), the 5-HT2/5-HT1C receptor antagonist ritanserin, or the peripheral 5-HT receptor antagonist xylamidine. However, the effect of DOI in this paradigm was significantly attenuated by ketanserin but was not antagonised by either ritanserin or (+/-)cyanopindolol. Therefore, the suppressive effect of these two 5-HT drugs on total and Polycose intake appears to be mediated, respectively, by 5-HT1B/5-HT1C receptors (d-fenfluramine) and 5-HT2 receptors (DOI).
Lawton
C L
CL
Department of Psychology, University of Leeds, UK.
Blundell
J E
JE
D000662:Amphetamines / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D000821:Animal Feed; D000818:Animals; D004032:Diet; D004040:Dietary Carbohydrates; D004435:Eating / Q000187:drug effects*; D005277:Fenfluramine / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D008297:Male; D051381:Rats; D012701:Serotonin / Q000502:physiology*; D012702:Serotonin Antagonists / Q000494:pharmacology*; D017366:Serotonin Receptor Agonists / Q000037:antagonists & inhibitors / Q000494:pharmacology*
D000662:Amphetamines; D004040:Dietary Carbohydrates; D012702:Serotonin Antagonists; D017366:Serotonin Receptor Agonists; D005277:Fenfluramine; D012701:Serotonin; C015952:4-iodo-2,5-dimethoxyphenylisopropylamine