6-Acetyl-7,7-dimethyl-5,6,7,8-tetrahydropterin is an activator of nitric oxide synthases
作者:Colin J. Suckling、Colin L. Gibson、Judith K. Huggan、Raghavendar R. Morthala、Brendan Clarke、Suma Kununthur、Roger M. Wadsworth、Simon Daff、Davide Papale
DOI:10.1016/j.bmcl.2008.01.079
日期:2008.3
produce eNOS, in which tetrahydrobiopterin biosynthesis has been blocked by inhibition of GTP cyclohydrolase 1, dihydropterin 3 restored production of nitric oxide by these cells. In tissues, 3 caused relaxation in preconstricted rat aortic rings, again in which tetrahydrobiopterin biosynthesis had been inhibited, an effect that was blocked by the NOS inhibitor, L-NAME. However, dihydropterin 3 was not
已显示6-乙酰基-7,7-二甲基-7,8-二氢蝶呤3在包含活性一氧化氮合酶(NOS)的细胞和组织中能够替代一氧化氮合酶的天然辅因子四氢生物蝶呤1。在产生iNOS的巨噬细胞和产生eNOS的内皮细胞中,四氢生物蝶呤的生物合成已被GTP环水解酶1的抑制所阻断,二氢蝶呤3还原了这些细胞产生的一氧化氮。在组织中,3导致收缩前的大鼠主动脉环松弛,再次抑制了四氢生物蝶呤的生物合成,这一作用被NOS抑制剂L-NAME阻断。但是,在没有四氢生物蝶呤的纯化NOS(nNOS)制剂中,双氢蝶呤3本身并不是活性的辅助因子,这表明细胞内还原为6-乙酰基7,7-二甲基-5,6,7,8-四氢蝶呤4是激活所必需的。通过用氰基硼氢化钠还原相应的7,8-二氢蝶呤来制备化合物4,并已证明它是nNOS生产一氧化氮的有效辅助因子。总之,结果表明7,7-二甲基-7,8-二氢蝶呤是有效的四氢生物蝶呤类似物的新型结构框架。