Abstract
A new benzamide, cis-N-(1-benzyl-2-methylpyrrolidin-3-yl)-5-chloro-2-methoxy-4-methylaminobenzamide (YM-09151-2) exhibited more potent and longer-lasting inhibitory effects on apomorphine-induced behaviours (stereotyped behaviour, emesis and hypothermia), and methamphetamine-induced stereotyped behaviour, conditioned avoidance response and open field behaviour than either structurally similar benzamides (YM-0850 and sulpiride) or calssical neuroleptics [chlorpromazine(CPZ) and haloperidol(HPD)]. Such inhibitory effects of YM-09151-2 relative to cataleptogenicity were greater than those of CPZ and HPD. In contrast, sulpiride elicited few of the neuroleptic effects described above. YM-09151-2, a potent inhibitor for dopamine-sensitive adenylate cyclase (Ki: 3.0 nM) reduced, in a selective manner, the binding of [3H]dopamine to the dopamine D1 receptor (Ki: 4.8 nM) associated with adenylate cyclase rather than to the dopamine D2 receptor (Ki: 0.98 μM) independent of adenylate cyclase. Sulpiride, on the contrary, inhibited only the binding to the dopamine D2 receptor. CPZ and HPD antagonized [3H]dopamine non-selectively at the two distinct dopaminergic receptors. These results suggest that YM-09151-2 is a potent and long-lasting neuroleptic with a highly selective blocking action on the dopamine D1 receptor.
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Usuda, S., Nishikori, K., Noshiro, O. et al. Neuroleptic properties of cis-N-(1-benzyl-2-methylpyrrolidin-3-yl)-5-chloro-2-methoxy-4-methylaminobenzamide (YM-09151-2) with selective antidopaminergic activity. Psychopharmacology 73, 103–109 (1981). https://doi.org/10.1007/BF00429198
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DOI: https://doi.org/10.1007/BF00429198