Synthetic studies on enkephalin analogs. I. Potent analgesic activity of H-Tyr-D-Ala-Gly-Phe-NHNH-CO-R (R=lower alkyl).
作者:SUSUMU SHINAGAWA、MASAHIKO FUJINO、HARUMITSU ISHII、KIYOHISA KAWAI
DOI:10.1248/cpb.29.3630
日期:——
Thirty tetrapeptide hydrazide analogs of enkephalin, H-Tyr-D-Ala-Gly-Phe-NHN-(R1)-R2 (R1, R2=H, alkyl or acyl), were synthesized. The analgesic activities of these peptides were tested in mice after intravenous or subcutaneous injection, and compared with that of morphine. Among the analogs synthesized, the tetrapeptide acyl-hydrazide analog, H-Tyr-D-Ala-Gly-Phe-NHNH-CO-R (R=lower alkyl), was the most active and showed analgesic activity ten times more potent than that of the tetrapeptide amide analog, H-Tyr-D-Ala-Gly-Phe-NH2 and half as potent as that of morphine. On the basis of these results, structure-activity relations in the hydrazide part of enkephalin analogs of this new type are discussed.
合成了三十种脑啡肽的四肽酰肼类似物H-Tyr-D-Ala-Gly-Phe-NHN-(R1)-R2(R1, R2=H,烷基或酰基)。这些肽类经静脉或皮下注入小鼠后,测试其镇痛活性,并与吗啡进行比较,在合成的类似物中,四肽酰肼H-Tyr-D-Ala-Gly-Phe-NHNH-CO-R(R=低级烷基)活性最强,其镇痛活性比四肽酰胺H-Tyr-D-Ala-Gly-Phe-NH2强十倍,比吗啡弱一半。根据这些结果,讨论了新型脑啡肽类似物酰肼部分的构效关系。