Different roles of 5-HT2A and 5-HT2C receptors in regulation of female rat paced mating behaviour.
Serotonin (5-HT) receptor 2A (5-HT2A) and 2C (5-HT2C) agonists have been reported to facilitate female rat lordosis behaviour. This study investigated the acute effects of the 5-HT2A receptor agonist DOI ((+/-)-1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane) and the 5-HT2C receptor agonist MK-212 (2-chloro-6-(1-piperazinyl) pyrazine) on paced mating behaviour in a population of sexually receptive female rats in order to explore the role of 5-HT2A and 5-HT2C receptors in the mediation of female rat sexual motivation. DOI (0.5 and 1.0 mg/kg) increased female rat sexual motivation during the first of two consecutive copulatory series seen as a tendency towards a decrease in return latencies following ejaculation and decreased inter-intromission intervals. MK-212 generally increased approach latencies. 0.5 mg/kg MK-212 increased post-ejaculatory exit latency, while 1.0 and 2.0 mg/kg MK-212 increased both post-ejaculatory exit latencies and post-ejaculatory return latencies. The possibility that an increased level of anxiety confounded the effects of MK-212 on sexual motivation behaviour is discussed. The results may support the hypothesis that both 5-HT2A and 5-HT2C receptors are important in regulation of female sexual behaviour.
Nedergaard
Per
P
Laboratory of Neuropsychiatry, Department of Psychiatry, Copenhagen University Hospital, Blegdamsvej 9, DK-2100 Copenhagen, Denmark. per@nedergaard.org
Sanchez
Connie
C
Mellerup
Erling
E
D000662:Amphetamines / Q000494:pharmacology; D000818:Animals; D004305:Dose-Response Relationship, Drug; D004958:Estradiol / Q000031:analogs & derivatives* / Q000494:pharmacology; D005260:Female; D008297:Male; D009042:Motivation; D011374:Progesterone / Q000494:pharmacology; D011719:Pyrazines / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D011930:Reaction Time / Q000187:drug effects; D044402:Receptor, Serotonin, 5-HT2A / Q000502:physiology*; D044405:Receptor, Serotonin, 5-HT2C / Q000502:physiology*; D058826:Serotonin 5-HT2 Receptor Agonists; D017366:Serotonin Receptor Agonists / Q000494:pharmacology; D012726:Sexual Behavior, Animal / Q000187:drug effects / Q000502:physiology*; D018709:Statistics, Nonparametric
D000662:Amphetamines; D011719:Pyrazines; D044402:Receptor, Serotonin, 5-HT2A; D044405:Receptor, Serotonin, 5-HT2C; D058826:Serotonin 5-HT2 Receptor Agonists; D017366:Serotonin Receptor Agonists; C074283:estradiol 3-benzoate; D011374:Progesterone; D004958:Estradiol; C014896:6-chloro-2-(1-piperazinyl)pyrazine; C015952:4-iodo-2,5-dimethoxyphenylisopropylamine