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Affinity of cyamemazine metabolites for serotonin, histamine and dopamine receptor subtypes.

Abstract：

:Animal and human pharmacological studies indicate that the antipsychotic action of cyamemazine results from blockade of dopamine D(2) receptors, its anxiolytic properties from serotonin 5-HT(2C) receptor antagonism and the low incidence of extrapyramidal side effects from a potent 5-HT(2A) receptor antagonistic action. Cyamemazine is metabolized in monodesmethyl cyamemazine and cyamemazine sulfoxide, which are not known for their affinities for serotonin, dopamine and other brain receptor types considered to mediate central nervous systems effects of drugs. Hence, metabolite affinities were determined in human recombinant receptors expressed in CHO cells (hD(2) and hD4.4 receptors, h5-HT(1A), h5-HT(2A), h5-HT(2C) and h5-HT(7) receptors and hM(1), hM(2) and hM(3) receptors) and HEK-293 cells (h5-HT(3) receptors) or natively present in rat cerebral cortex (non-specific alpha(1)- and alpha(2)-adrenoceptors, GABA(A) and GABA(B) receptors) and guinea pig cerebellum (H(1) central histamine receptors) membranes. Monodesmethyl cyamemazine showed a neurotransmitter receptor profile similar to that of its parent compound cyamemazine, i.e.: high affinity for h5-HT(2A) receptors (K(i)=1.5 nM), h5-HT(2C) receptors (K(i)=12 nM) and hD(2) receptors (K(i)=12 nM). Cyamemazine sulfoxide showed high affinity for h5-HT(2A) receptors (K(i)=39 nM) and histamine H(1) receptors (K(i)=15 nM) and a reduced affinity for D(2) and 5-HT(2C) receptors. Therefore, monodesmethyl cyamemazine can contribute to enhance and prolong the therapeutic actions of cyamemazine. Further investigation is required to see if the high affinities of cyamemazine sulfoxide for H(1) and 5-HT(2A) receptors are of therapeutic benefit against sleep onset insomnia and/or sleep maintenance insomnia respectively.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Benyamina A,Arbus C,Nuss P,Garay RP,Neliat G,Hameg A

doi

10.1016/j.ejphar.2007.09.025

subject

Has Abstract

pub_date

2008-01-14 00:00:00

pages

142-7

issue

2-3

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(07)01053-9

journal_volume

578

pub_type

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