(S)-UH-301 antagonizes (R)-8-OH-DPAT-induced cardiovascular effects in the rat.

L Björk, S Lindgren, U Hacksell, T Lewander

Index: Eur. J. Pharmacol. 199 , 367, (1991)

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Abstract

The 5-HT1A-receptor antagonist (S)-UH-301 (S)-5-fluoro-8-hydroxy-2- (dipropylamino)tetralin) completely antagonized the hypotension and bradycardia induced by (R) = 8-OH DPAT [R)-8-hydroxy-2- (dipropylamino)tetralin) in conscious rats. (S)-UH-301 alone induced a weak hypertension, which might be due to its 5-HT1A-receptor antagonistic properties. (R)-UH-301 induced effects similar to those of (R)-8-OH DPAT, i.e., a short initial phase of hypertension followed by a long-lasting hypotension and bradycardia. Thus, (R)-UH-301 behaves as a 5-HT1A-receptor agonist and (S)-UH-301 as a 5-HT1A-receptor antagonist, abolishing the effects induced by (R)-8-OH DPAT.