Newman-Tancredi A, Assié M-B, Martel J-C, Cosi C, Slot L Bruins, Palmier C, Rauly-Lestienne I, Colpaert F, Vacher B, Cussac D
Division of Neurobiology 2, Centre de Recherche Pierre Fabre, Castres, France.
Br J Pharmacol. 2007 May;151(2):237-52. doi: 10.1038/sj.bjp.0707158. Epub 2007 Mar 20.
Combining 5-HT(1A) receptor activation with dopamine D(2)/D(3) receptor blockade should improve negative symptoms and cognitive deficits in schizophrenia. We describe the in vitro profile of F15063 (N-[(2,2-dimethyl-2,3-dihydro-benzofuran-7-yloxy)ethyl]-3-(cyclopent-1-enyl)-benzylamine).
F15063 was characterised in tests of binding affinity and in cellular models of signal transduction at monoamine receptors.
Affinities (receptor and pK(i) values) of F15063 were: rD(2) 9.38; hD(2L) 9.44; hD(2S) 9.25; hD(3) 8.95; hD(4) 8.81; h5-HT(1A) 8.37. F15063 had little affinity (40-fold lower than D(2)) at other targets. F15063 antagonised dopamine-activated G-protein activation at hD(2), rD(2) and hD(3) receptors with potency (pK (b) values 9.19, 8.29 and 8.74 in [(35)S]GTP gamma S binding experiments) similar to haloperidol. F15063 did not exhibit any hD(2) receptor agonism, even in tests of ERK1/2 phosphorylation and G-protein activation in cells with high receptor expression. In contrast, like (+/-)8-OH-DPAT, F15063 efficaciously activated h5-HT(1A) (E(max) 70%, pEC(50) 7.57) and r5-HT(1A) receptors (52%, 7.95) in tests of [(35)S]GTP gamma S binding, cAMP accumulation (90%, 7.12) and ERK1/2 phosphorylation (93%, 7.13). F15063 acted as a partial agonist for [(35)S]GTP gamma S binding at hD(4) (29%, 8.15) and h5-HT(1D) receptors (35%, 7.68). In [(35)S]GTP gamma S autoradiography, F15063 activated G-proteins in hippocampus, cortex and septum (regions enriched in 5-HT(1A) receptors), but antagonised quinelorane-induced activation of D(2)/D(3) receptors in striatum.
F15063 antagonised dopamine D(2)/D(3) receptors, a property underlying its antipsychotic-like activity, whereas activation of 5-HT(1A) and D(4) receptors mediated its actions in models of negative symptoms and cognitive deficits of schizophrenia (see companion papers).
将5-羟色胺(5-HT)1A受体激活与多巴胺D2/D3受体阻断相结合,应能改善精神分裂症的阴性症状和认知缺陷。我们描述了F15063(N-[(2,2-二甲基-2,3-二氢-苯并呋喃-7-基氧基)乙基]-3-(环戊-1-烯基)-苄胺)的体外特性。
在单胺受体的结合亲和力测试和信号转导细胞模型中对F15063进行了特性鉴定。
F15063的亲和力(受体和pK(i)值)为:大鼠D2受体9.38;人D2L受体9.44;人D2S受体9.25;人D3受体8.95;人D4受体8.81;人5-HT1A受体8.37。F15063在其他靶点的亲和力很低(比D2受体低40倍)。在[(35)S]GTPγS结合实验中,F15063拮抗多巴胺激活的人D2、大鼠D2和人D3受体的G蛋白激活,其效力(pK(b)值分别为9.19、8.29和8.74)与氟哌啶醇相似。即使在高受体表达细胞的ERK1/2磷酸化和G蛋白激活测试中,F15063也未表现出任何hD2受体激动作用。相反,与(+/-)8-OH-DPAT一样,在[(35)S]GTPγS结合、cAMP积累(90%,7.12)和ERK1/2磷酸化(93%,7.13)测试中,F15063有效激活人5-HT1A受体(E(max) 70%,pEC(50) 7.57)和大鼠5-HT1A受体(52%,7.95)。F15063在人D4受体(29%,8.15)和人5-HT1D受体(35%,7.68)的[(35)S]GTPγS结合中作为部分激动剂。在[(35)S]GTPγS放射自显影中,F15063激活海马、皮层和隔区(富含5-HT1A受体的区域)的G蛋白,但拮抗喹硫平诱导的纹状体D2/D3受体激活。
F15063拮抗多巴胺D2/D3受体,这是其抗精神病样活性的基础,而5-HT1A和D4受体的激活介导了其在精神分裂症阴性症状和认知缺陷模型中的作用(见配套论文)。