Umathe SN, Wanjari MM, Manna SS, Jain NS
A possible participation of gonadotropin-releasing hormone in the neuroleptic and cataleptic effect of haloperidol. [JOURNAL ARTICLE]
Neuropeptides 2009 Apr 27.
Haloperidol, an antipsychotic agent, stimulates the release of gonadotropin-releasing hormone (GnRH), and this hormone is known to mimic some of the behavioral effects of haloperidol. Hence, the present study was carried out to find out the contribution of GnRH in the behavioral effects of haloperidol. The studies revealed that haloperidol (0.15, 0.25 and 0.5mg/kg, i.p.) and leuprolide (GnRH agonist; 50, 100, 200 and 400mug/kg, s.c.) dose-dependently inhibited conditioned avoidance response (CAR) in male Sprague-Dawley rats. In higher doses, haloperidol (0.5, 1mg/kg, i.p.) and leuprolide (200, 400mug/kg, s.c.) produced catalepsy in rats. Co-administration of sub-effective dose of leuprolide (50 or 100mug/kg, s.c.) and haloperidol (0.15 or 0.5mg/kg, i.p.) similarly inhibited CAR and induced catalepsy. Pre-treatment of rats with antide (GnRH antagonist; 10mug/rat, s.c.), attenuated the inhibitory effect of both the agents on CAR; blocked leuprolide-induced catalepsy; and attenuated the intensity and reduced the duration of haloperidol-induced catalepsy. In conclusion, the studies suggest a possible role of GnRH in the neuroleptic and cataleptic effect of haloperidol.
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