Des-Tyr1-dermorphin, des-Tyr1-[D-Arg2] dermorphin, and the N-terminal di-, tri-, tetra- and hexapeptide amides of [D-Arg2] dermorphin were synthesized by a conventional solution method and their analgesic activities were assayed by means of the tail pressure test after subcutaneous administration (s. c.) to mice. The des-Tyr1 analogs of both dermorphin and [D-Arg2] dermorphin did not show analgesic activity even at a dose of up to 50 mg/kg, s. c. The N-terminal tetrapeptide amide, H-Tyr-D-Arg-Phe-Gly-NH2, showed extremely potent activity, being 31 times more active than morphine on a molar basis, whereas the N-terminal tri- and dipeptide amides showed no activity even at a dose of up to 40 mg/kg, s. c.
采用传统的溶液法合成了去
酪氨酸1-德
吗啡、去
酪氨酸1-[D-Arg2]德
吗啡和[D-Arg2]德
吗啡的N-末端二肽、三肽、四肽和六肽
酰胺,并通过对小鼠皮下注射后进行尾压试验来检测它们的镇痛活性。N-末端的四肽
酰胺 H-Tyr-D-Arg-Phe-Gly-NH2 显示出极强的活性,其摩尔活性是
吗啡的 31 倍,而 N-末端的三肽和二肽
酰胺即使剂量高达 40 毫克/千克(皮下注射)也没有活性。