Studies on analgesic oligopeptides. V. Structure-activity relationship of tripeptide alkylamides, Tyr-D-Arg-Phe-X.
作者:KENJI SUZUKI、HIROKI FUJITA、YUSUKE SASAKI、MIKI SHIRATORI、SHINOBU SAKURADA、KENSUKE KISARA
DOI:10.1248/cpb.36.4834
日期:——
Twenty-one analogs based on the structure Tyr-D-Arg-Phe-X (X=OH, alkyl ester, alkylamide or amino acid having a different carbon chain) were synthesized by the solution method and their analgesic activities were tested after subcutaneous (s. c.) administration in mice. Most tripeptide alkylamides showed no analgesia at a dose of 10 mg/kg, s. c. However, some tripeptide alkylamides having the hydroxyl group on the alkyl moiety showed greater activity than morphine. Introduction of the carboxyl group on the alkyl moiety also led to tetrapeptide analogs with potent analgesia, e. g., the compound with X=β-alanine is 33 times more potent than morphine on a molar basis. These results suggest that proper carbon chain lengths and the presence of an oxygen atom at the fourth position are important for high analgesic activity in the series of D-Arg2-dermorphin analogs.
通过溶液法合成了基于结构Tyr-D-Arg-Phe-X(X=OH,烷基酯,烷基酰胺或具有不同碳链的氨基酸)的21种类似物,并在小鼠皮下(s.c.)给药后测试了它们的镇痛活性。大多数三肽烷基酰胺在10 mg/kg,s.c.剂量下没有镇痛作用。然而,一些在烷基部分具有羟基的三肽烷基酰胺显示出比吗啡更大的活性。在烷基部分引入羧基也导致具有强效镇痛作用的四肽类似物,例如,X=β-丙氨酸的化合物在摩尔基础上比吗啡强33倍。这些结果表明,适当的碳链长度和在第四位存在氧原子对于D-Arg2-dermorphin类似物系列中的高镇痛活性是重要的。