Selective serotonin re-uptake inhibitors decrease schedule-induced polydipsia in rats: a potential model for obsessive compulsive disorder
Tóm tắt
Schedule-induced polydipsia was used to determine the effects of selective serotonin re-uptake inhibitors on adjunctive water consumption. Polydipsia was induced in food deprived rats by exposure to a fixed time feeding schedule (FT=60 s) for 150 min per day for 22 days. Selected polydipsic rats consumed 3–4 times greater volume of water compared to food deprived control rats. Chronic administration of the selective serotonin re-uptake inhibitors fluoxetine and clomipramine (CMI) at 5 mg/kg per day and fluvoxamine at 10 mg/kg twice a day significantly decreased schedule-induced polydipsia (SIP) on day 15 and throughout the remainder of the study compared to control rats. The noradrenergic re-uptake inhibitor, desipramine (DMI), only decreased SIP behavior on day 1. The neuroleptic, haloperidol (0.03 and 0.1 mg/kg), and the benzodiazepine, diazepam (2.5 mg/kg), failed to alter SIP behavior. Since obsessive-compulsive disorder (OCD) and polydipsic behavior both involve excessive expression of a normal behavior, the polydipsia model may be relevant for the prediction of compounds useful in the treatment of OCD.
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