Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0033377 (prolapse)
 11,717 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Recent pharmacologic studies suggest that nefazodone may possess antidepressant activity. Nefazodone is active in behavioral models predictive of antidepressant potential. It is active in reversing learned helplessness, prevents reserpine-induced ptosis, and enhances response efficiency in the differential reinforcement for low rates of response paradigm. In in vitro studies, nefazodone inhibits the binding of [3H]ketanserin to cortical serotonin2 (5-HT2) binding sites, whereas in vivo, it antagonizes the 5-HT2-mediated quipazine-induced head shake in rats. In ex vivo studies, acute oral administration of nefazodone inhibits cortical serotonin uptake and occupies frontal cortical 5-HT2 receptor binding sites. Chronic administration of nefazodone produces a reduction in 5-HT2-mediated behavior and decreases cortical 5-HT2 receptor binding site density. Further, a chronic high-dose nefazodone regimen significantly potentiates 5-HT1A-mediated behavioral responses in rats. Nefazodone exhibits decreased anticholinergic, alpha-adrenolytic, and sedative activity relative to other antidepressants.
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PMID:Nefazodone: preclinical pharmacology of a new antidepressant. 227 30

Chronic phencyclidine (PCP) administration has been shown to produce tolerance to a number of its pharmacological actions. We have suggested that PCP interacts with the 5-HT2 receptors since it inhibits [3H]spiperone binding to 5-HT2 receptors in vitro. In the present study, we investigated whether methysergide (a 5-HT2 receptor blocker) induces the precipitated withdrawal syndrome in PCP-tolerant rats. The body weight of the rats in the abrupt and precipitated withdrawal groups was significantly lower 5 days and 1-5 days after withdrawal, respectively, than that in the control group. Furthermore, other typical precipitated abstinence syndrome characteristics such as jumping, wet-dog shake and ptosis were also observed in the precipitated withdrawal group. These results suggest that PCP produces its behavioral effects via an agonistic interaction with 5-HT2 receptor sites and that our method may be very useful for the development of a rat model for studying physical dependence on PCP.
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PMID:Methysergide-induced precipitated withdrawal syndrome in phencyclidine-dependent rats. 376 58