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Comparative Study
. 2004 Oct 19;502(3):239-42.
doi: 10.1016/j.ejphar.2004.08.050.

5-HT7, but not 5-HT2B, receptors mediate hypotension in vagosympathectomized rats

David Centurión  1 , Erika Glusa, Araceli Sánchez-López, Luis F Valdivia, Pramod R Saxena, Carlos M Villalón
Affiliations
Comparative Study

5-HT7, but not 5-HT2B, receptors mediate hypotension in vagosympathectomized rats

David Centurión et al. Eur J Pharmacol. .

Abstract

This study evaluated the possible involvement of 5-HT(2B) receptors in long-lasting hypotension to 5-hydroxytryptamine (5-HT), which is predominantly mediated by 5-HT7 receptors, in anaesthetised vagosympathectomized rats. Intravenous injections of 5-HT and 5-carboxamidotryptamine (5-CT) elicited a dose-dependent hypotension that was dose-dependently antagonised by (R)-1-[(3-hydroxyphenyl)sulfonyl]-2-[2-(4-methyl-1-piperidinyl) ethyl] pyrrolidine (SB-269970; a selective 5-HT7 receptor antagonist), but not by saline. Interestingly, alpha-methyl-5-(2-thienylmethoxy)-1H-indole-3-ethanamine (BW723C86; a 5-HT(2B) receptor agonist) produced vasopressor responses without affecting hypotension to 5-HT. These results suggest that hypotension to 5-HT and 5-CT is mainly mediated by 5-HT7 receptors, whilst the role of 5-HT(2B) receptors seems unlikely.

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