1,3-Dialkyl-8-(p-sulfophenyl)xanthines: potent water-soluble antagonists for A1- and A2-adenosine receptors
作者:John W. Daly、W. Padgett、M. T. Shamim、P. Butts-Lamb、J. Waters
DOI:10.1021/jm00382a018
日期:1985.4
further enhances potency of the 1,3-dipropyl-8-phenylxanthine at both A1 and A2 receptors. The 8-(2-amino-4-chlorophenyl)-1,3-dipropylxanthine is a very potent and selective antagonist for A1 receptors, being nearly 400-fold more potent at A1 than at A2 receptors. The water-soluble 8-(p-sulfophenyl)- and 8-(p-carboxyphenyl)-1,3-propylxanthines no longer exhibit marked selectivity. Both compounds are
评估了茶碱和其他1,3-二烷基黄嘌呤的一系列8-(取代苯基)衍生物作为脑组织中A1-和A2-腺苷受体拮抗剂的效能和选择性。茶碱对A1和A2受体的功效相似(Ki = 14 microM)。作为腺苷受体拮抗剂,8-苯基茶碱的功效比茶碱高25-35倍,而8-苯基咖啡因的功效仅比咖啡因高2-3倍。对羟基芳基取代基增强了8-苯基茶碱作为腺苷拮抗剂的效力。对-羧基和对-硫芳基取代基降低了8-苯基茶碱的效力,产生了水溶性腺苷拮抗剂,在腺苷受体上,它们的效力比茶碱大2-5倍。8-(取代的苯基)茶碱均没有特别选择性地作为对A1-和A2-腺苷受体的拮抗剂。1,3-二丙基-8-苯基黄嘌呤代表一种有效的和选择性的A1受体拮抗剂,在A1受体上的效力比在A2受体上高约23倍。对羟基芳基取代基进一步增强了1,3-二丙基-8-苯基黄嘌呤在A1和A2受体上的效力。8-(2-氨基-4-氯苯基)-1,3-二丙基黄嘌呤是A1受体