Discovery of 7-Methoxy-6-[4-(4-methyl-1,3-thiazol-2-yl)-1<i>H</i>-imidazol-5-yl]-1,3-benzothiazole (TASP0382088): A Potent and Selective Transforming Growth Factor-β Type I Receptor Inhibitor as a Topical Drug for Alopecia
作者:Hideaki Amada、Hajime Asanuma、Takeshi Koami、Atsushi Okada、Mayumi Endo、Yasuji Ueda、Takumi Naruse、Akiko Ikeda
DOI:10.1248/cpb.c12-00856
日期:——
7-Methoxy-6-[4-(4-methyl-1,3-thiazol-2-yl)-1H-imidazol-5-yl]-1,3-benzothiazole 11 (TASP0382088) was synthesized and evaluated as transforming growth factor-β (TGF-β) type I receptor (also known as activin receptor-like kinase 5 or ALK5) inhibitor. Compound 11, a potent and selective ALK5 inhibitor, exhibited good enzyme inhibitory activity (IC50=4.8 nM) as well as inhibitory activity against TGF-β-induced Smad2/3 phosphorylation at a cellular level (IC50=17 nM). The introduction of a methoxy group to the benzothiazole ring in 1 and the break up of the planarity between the imidazole ring and the thiazole ring improved the solubility in the lotion base of 11. Furthermore, the topical application of 3% 11 lotion significantly inhibited Smad2 phosphorylation in mouse skin at 8 h after application (71% inhibition, compared with vehicle-treated animals).
合成7-甲氧基-6-[4-(4-甲基-1,3-噻唑-2-基)-1H-咪唑-5-基]-1,3-苯并噻唑11 (TASP0382088)并评价其转化生长β 因子 (TGF-β) I 型受体(也称为激活素受体样激酶 5 或 ALK5)抑制剂。化合物 11 是一种有效的选择性 ALK5 抑制剂,具有良好的酶抑制活性 (IC50=4.8 nM) 以及细胞水平上对 TGF-β 诱导的 Smad2/3 磷酸化的抑制活性 (IC50 =17 n<小>M小>)。在1的苯并噻唑环上引入甲氧基以及咪唑环和噻唑环之间平面性的破坏提高了11在洗剂基质中的溶解度。此外,局部应用3%11洗剂显着抑制Smad2应用后 8 小时,小鼠皮肤发生磷酸化(与媒介物处理的动物相比,抑制率为 71%)。