Abstract:
:The aim of the present study was to compare, in chloral-hydrate anaesthetized rats, the alpha(2)-adrenergic properties of the selective 5-HT(1A) receptor agonist, alnespirone (S-20499), with those of buspirone, a 5-HT(1A) receptor agonist exhibiting potent alpha(2)-adrenoceptor antagonist properties via its principal metabolite, 1-(2-pyrimidinyl)-piperazine. Both locus coeruleus spontaneous firing activity and noradrenaline release in the medial prefrontal cortex were potently inhibited by the alpha(2)-adrenoceptor agonist clonidine, at a dose of 40 microg/kg (i.p.). Such an inhibition was neither prevented nor reversed by alnespirone (10 mg/kg, i.p.), while buspirone, at the same dose, potently antagonized the locus coeruleus inhibitory effects of clonidine. These data demonstrate that, in contrast with some aryl-piperazine compounds (such as buspirone), alnespirone, either on its own or via a possible metabolite such as buspirone, is devoid in vivo of significant alpha(2)-adrenoceptor antagonist properties.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Astier B,Lambás Señas L,Soulière F,Schmitt P,Urbain N,Rentero N,Bert L,Denoroy L,Renaud B,Lesourd M,Muñoz C,Chouvet Gdoi
10.1016/s0014-2999(02)02814-5keywords:
subject
Has Abstractpub_date
2003-01-10 00:00:00pages
17-26issue
1eissn
0014-2999issn
1879-0712pii
S0014299902028145journal_volume
459pub_type
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