A trifluoromethylphenyl piperazine derivative with high affinity for 5-hydroxytryptamine-1A sites in rat brain.

Abstract:

:The inhibition of [3H]5-hydroxytryptamine [( 3H]5-HT) binding in rat brain by 1-[2-(3-bromoacetamidophenyl)ethyl]-4-(3-trifluoromethylphenyl) piperazine (BrAcTFMPP) and that by spiperone were compared. Spiperone inhibition of [3H]5-HT binding in cortex was consistent with displacement from two sites with dissociation constants (KD) of 24 nM (5-HT-1A site) and 19 microM (5-HT-1B site) for spiperone. BrAcTFMPP also discriminated two subpopulations of [3H]5-HT binding sites with dissociation constants of 0.5 nM and 146 nM for the compound. The proportion of high-affinity sites for each compound represented about 35% of the specific [3H]5-HT binding. In the presence of 1 microM spiperone, a concentration that saturates the 5-HT-1A sites while having a minimal effect on 5-HT-1B sites, BrAcTFMPP displaced [3H]5-HT from a single site with a KD for BrAcTFMPP of 145 nM. The inhibition of [3H]5-HT binding by spiperone in the presence of 30 nM BrAcTFMPP was best fit by a single-site model with a KD of 21 microM for spiperone. In corpus striatum, 5-HT-1A sites, as defined with spiperone, represented 15% of the specific [3H]5-HT binding and 30 nM BrAcTFMPP also blocked about 15% of the binding. A significant difference between spiperone and BrAcTFMPP was their affinity for 5-HT-2 receptors. BrAcTFMPP (KD = 41 nM) had an 80-fold lower affinity for these sites than spiperone (KD = 0.5 nM). Thus, BrAcTFMPP and spiperone discriminate the same two subpopulations of [3H]5-HT binding sites and BrAcTFMPP displays a high affinity and a selectivity for 5-HT-1A sites versus both 5-HT-1B and 5-HT-2 sites.

journal_name

J Neurochem

authors

Ransom RW,Asarch KB,Shih JC

doi

10.1111/j.1471-4159.1985.tb12897.x

subject

Has Abstract

pub_date

1985-03-01 00:00:00

pages

875-80

issue

3

eissn

0022-3042

issn

1471-4159

journal_volume

44

pub_type

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