Abstract：
:We previously reported that the centrally acting non-narcotic antitussive, tipepidine, produces a novel antidepressant-like effect in the forced swimming test in rats, but the mechanism of the antidepressant-like effect of tipepidine is not clear. We investigated the pharmacological mechanism of the antidepressant-like effect of tipepidine in the forced swimming test in rats. A catecholamine-depleting agent, alpha-methyl-p-tyrosine (AMPT; 300 mg/kg, s.c.), was given 6h before the first injection and with the last injection of tipepidine (40 mg/kg, i.p.). A serotonin (5-HT)-depleting agent, p-chlorophenylalanine (PCPA; 350 mg/kg, i.p.), was given 72 h and 48 h before the pretest session. The dopamine D(1) receptor antagonist, SCH23390 (0.02 mg/kg, s.c.) was given 15min before each of the three injections of tipepidine. The dopamine D(2) receptor antagonist raclopride (0.2mg/kg, s.c.), the alpha 1 adrenoceptor antagonist prazosin (1mg/kg, i.p.), the alpha 2 adrenoceptor antagonist yohimbine (2mg/kg, i.p.) and the beta adrenoceptor antagonist propranolol (2mg/kg, i.p.) were given 30 min before each of the three injections of tipepidine. AMPT, but not PCPA, significantly inhibited the immobility time-reducing effect of tipepidine in the forced swimming test. Furthermore, the effect of tipepidine was significantly inhibited by SCH23390 and yohimbine. However, raclopride, prazosin, and propranolol failed to block the effect of tipepidine. The results suggest that the antidepressant-like effect of tipepidine in the forced swimming test may be due at least in part to the effects of dopamine and noradrenaline released at the dopamine D(1) receptor and alpha 2 adrenoceptor, respectively.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Kawaura K,Miki R,Urashima Y,Kawahara R,Soeda F,Shirasaki T,Takahama Kdoi
10.1016/j.bbr.2011.09.031subject
Has Abstractpub_date
2012-01-15 00:00:00pages
381-5issue
2eissn
0166-4328issn
1872-7549pii
S0166-4328(11)00704-2journal_volume
226pub_type
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