N型和T型钙离子通道均与疼痛传递有关,并且N型通道是治疗神经性疼痛的有效靶点。对一系列取代的氨基苯并噻唑的SAR研究在基于FLIPR的细胞内钙反应测定法中测定了在Ca V 2.2和Ca V 3.2通道的效价,确定了与阳性对照Z160具有可比活性的五种化合物的子集。这些化合物可能构成开发药物前导和工具化合物的基础,这些化合物和工具化合物用于评估Ca V 2.2和Ca V 3.2通道的可变调节的体内作用。
Synthesis and biological evaluation of nonpeptide mimetics of ω-conotoxin GVIA
摘要:
A benzothiazole-derived compound (4a) designed to mimic the C-alpha-C-beta bond vectors and terminal functionalities of Lys2, TyrI3 and Arg17 in omega-conotoxin GVIA was synthesised, together with analogues (4b-d), which had each side-chain mimic systematically truncated or eliminated. The affinity of these compounds for rat brain N-type and P/Q-type voltage gated calcium channels (VGCCs) was determined. In terms of N-type channel affinity and selectivity, two of these compounds (4a and 4d) were found to be highly promising, first generation mimetics of omega-conotoxin. The fully functionalised mimetic (4a) showed low PM binding affinity to N-type VGCCs (IC50 = 1.9 muM) and greater than 20-fold selectivity for this channel sub-type over P/Q-type VGCCs, whereas the mimetic in which the guanidine-type side chain was truncated back to an amine (4d, IC50 = 4.1 muM) showed a greater than 25-fold selectivity for the N-type channel. (C) 2004 Elsevier Ltd. All rights reserved.