Cocaine-induced genital reflexes in paradoxical sleep deprived rats: Indications of mediation by serotonin receptors

Cocaine-induced genital reflexes in paradoxical sleep deprived rats: Indications of mediation by serotonin receptors

Author Andersen, Monica L. Google Scholar
Antunes, Isabela B. Google Scholar
Tufik, Sergio Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract As paradoxical sleep deprivation (PSD) modifies cocaine-induced genital reflexes (penile erection [PE] and ejaculation [EJ]) and since cocaine is a scrotonin (5-HT) reuptake inhibitor, we hypothesized that 5-HT also plays a role in these genital reflexes in PSD male rats. After a 4-day period of PSD each group was administered with serotonergic, drugs prior to cocaine and placed in observation cages. the selective 5-HT1 agonist (8-OH-DPAT) completely abolished PE events whereas the antagonist (pindolol) did not produce significant effects in the number of animals displaying PE. It was found that both drugs reduce the frequency of PE. There were no significant effects on the number of animals that ejaculated or in its frequency after pindolol although both parameters were reduced by the agonist at the highest doses (2 and 4 mg/kg, SC). Pretreatment with the 5-HT2 agonist 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI) (0.12; 0.5 and 1 mg/kg, SC) significantly reduced the number of rats displaying PE and all doses reduced both PE and EJ frequencies. the number of animals displaying PE after 5-HT2 antagonist (ketanserin) pretreatment at 1 and 2.5 mg/kg doses was significantly decreased in relation to vehicle rats and all doses reduced PE frequency. 5-HT2 compounds at any dose did not affect the number of animals ejaculating, but the frequency was significantly reduced by all doses of DOI and by 1 to 5 mg/kg doses of ketanserin. Taken together, the results suggest that serotonergic receptors play an important role in genital reflexes induced by cocaine in sleep deprived males. (c) 2006 Elsevier Inc. All rights reserved.
Keywords cocaine
DOI
DPAT
ketanserin
pindolol
serotonin receptors
sexual behavior
sleep deprivation
Language English
Date 2007-03-30
Published in Progress in Neuro-psychopharmacology & Biological Psychiatry. Oxford: Pergamon-Elsevier B.V., v. 31, n. 2, p. 496-502, 2007.
ISSN 0278-5846 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 496-502
Origin http://dx.doi.org/10.1016/j.pnpbp.2006.11.018
Access rights Closed access
Type Review
Web of Science ID WOS:000244808800029
URI http://repositorio.unifesp.br/handle/11600/29596

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