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.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Centurión D,Glusa E,Sánchez-López A,Valdivia LF,Saxena PR,Villalón CMdoi
10.1016/j.ejphar.2004.08.050keywords:
subject
Has Abstractpub_date
2004-10-19 00:00:00pages
239-42issue
3eissn
0014-2999issn
1879-0712pii
S0014-2999(04)01001-5journal_volume
502pub_type
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