Potent, selective, and subunit‐dependent activation of TRPC5 channels by a xanthine derivative
作者:Aisling Minard、Claudia C. Bauer、Eulashini Chuntharpursat‐Bon、Isabelle B. Pickles、David J. Wright、Melanie J. Ludlow、Matthew P. Burnham、Stuart L. Warriner、David J. Beech、Katsuhiko Muraki、Robin S. Bon
DOI:10.1111/bph.14791
日期:2019.10
potentiated their activation by sphingosine-1-phosphate but suppressed activation evoked by (-)-englerin A (EA). In patch-clamp studies, AM237 activated TRPC5:C5 channels, with greater effect at positive voltages, but with lower efficacy than EA. Pico145 competitively inhibited AM237-induced TRPC5:C5 activation. AM237 did not activate TRPC4:C4, TRPC4-C1, TRPC5-C1, TRPC1:C5, and TRPC1:C4 channels, or native
背景和目的TRPC1,TRPC4和TRPC5蛋白形成同四聚体或异四聚体,钙可渗透的阳离子通道,这些通道涉及各种疾病状态。最近的研究已经产生了基于黄嘌呤的特异性和有效的TRPC1 / 4/5抑制剂。在这里,我们研究了这些通道基于黄嘌呤激活剂的可能性。实验方法合成了TRPC1 / 4/5抑制剂Pico145的类似物AM237,并使用过表达TRPC4,TRPC5,TRPC4-C1,TRPC5-C1,TRPC1:C4或TRPC1:C5通道的HEK细胞研究了其活性。 A498细胞表达天然TRPC1:C4通道。TRPC1 / 4/5通道活性通过测量细胞内Ca2 +([Ca2 +] i)浓度和膜片钳电生理测定。针对TRPC3,TRPC6,TRPV4或TRPM2通道测试了AM237的选择性。关键结果AM237有效激活了TRPC5:C5通道(在[Ca2 +] i分析中EC50为15-20 nM),并通过1磷