Relationship between enhancement of morphine analgesia and inhibition of enkephalinase by 2S, 3R 3-amino-2-hydroxy-4-phenylbutanoic acid derivatives

Autor: Takemi Koeda, Hamao Umezawa, Yasuharu Sekizawa, Hiroko Kawashima, Shunzo Fukatsu, Mikio Munakata, Takaaki Aoyagi, Tomio Takeuchi, Keiko Shitoh, Takeshi Nakamura, Kenji Kawamura, Mitsugu Hachisu
Rok vydání: 1982
Předmět:
Zdroj: Life Sciences. 30:1739-1746
ISSN: 0024-3205
DOI: 10.1016/0024-3205(82)90308-3
Popis: The effects of nineteen AHPA derivatives were examined on morphine analgesia by tail-flick test in rats and on enkephalinase inhibition which was based on the formation of tyrosyl-glycyl-glycine from met-enkephalin. The correlation between the enhancement of morphine analgesia in vivo and enkephalinase inhibition in vitro was analyzed. The different analogs varied considerably in the degree of enhancement of morphine analgesia and inhibition of enkephalinase. A close relationship between enkephalinase inhibition expressed by IC50in vitro and enhancement of morphine analgesia in vivo was observed in thirteen out of nineteen AHPA derivatives examined. One of other six AHPA derivatives which showed weak effectiveness in potentiating on morphine analgesia but was highly potent as an enkephalinase inhibitor, caused potent analgesic action when it was applied intracisternally indicating poor penetration of the blood brain barrier. The possibility was discussed that some of other compounds excluded from the linear relationship might act on other enkephalin degrading enzymes such as aminopeptidase.
Databáze: OpenAIRE