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0026-895X/97/010016-05$3.00/0
Copyright © by The American Society for Pharmacology and Experimental Therapeutics
All rights of reproduction in any form reserved.
MOLECULAR PHARMACOLOGY 52:16-20 (1997).


ACCELERATED COMMUNICATION
Nonpeptide Mimic of Bradykinin with Long-Acting Properties at the Bradykinin B2 Receptor

Ichiro Aramori, Junko Zenkoh, Noriyuki Morikawa, Masayuki Asano, Chie Hatori, Hiroe Sawai, Hiroshi Kayakiri, Shigeki Satoh, Takayuki Inoue, Yoshito Abe, Yuki Sawada, Tsuyoshi Mizutani, Noriaki Inamura, Kunio Nakahara, Hitoshi Kojo, Teruo Oku, and Yoshitada Notsu

Molecular Biological Research Laboratory (I.A., J.Z., N.M., H.Ko., Y.N.), Departments of Pharmacology (M.A., C.H., H.S., N.I., K.N.) and Chemistry (H.Ka., S.S., T.I., Y.A., Y.S., T.M., T.O.), Exploratory Research Laboratories, Fujisawa Pharmaceutical Co., Ltd., 5-2-3 Tokodai, Tsukuba 300-26, Japan

Kinins, members of a family of peptides released from kininogens by the action of kallikreins, exhibit a variety of biological activities including vasodilation, increased vascular permeability, contraction of smooth muscle cells, and activation of sensory neurons. However, investigation of the physiological actions of kinins has been greatly hampered because its effects are curtailed by rapid proteolysis in blood, lung, and liver. We describe the pharmacological characteristics of a novel nonpeptide bradykinin receptor agonist FR190997 (8-[2,6-dichloro-3-[N-[(E)-4-(N-methylcarbamoyl)cinnamidoacetyl]-N-methylamino]benzyloxy]-2-methyl-4-(2-pyridylmethoxy)quinoline). FR190997 markedly stimulated phosphatidylinositol hydrolysis in Chinese hamster ovary cells permanently expressing the human bradykinin B2 receptor. The response of phosphatidylinositol hydrolysis was antagonized by the B2 receptor selective antagonist Hoe 140 (D-Arg-[hydroxyproline3,beta -thienylalanine4,D-Tic7,Oic8]bradykinin). In competitive experiments using membranes prepared from Chinese hamster ovary cells expressing the human bradykinin receptor subtypes, FR190997 showed a high affinity binding to the B2 receptor with IC50 value of 5.3 nM and no binding affinity for the B1 receptor. In vivo, FR190997 mimics the biological action of bradykinin and induces hypotensive responses in rats with prolonged duration. Therefore, FR190997 is a highly potent and subtype-selective nonpeptide agonist which displays high intrinsic activity. This compound should represent a powerful tool for further investigation of the physiology and pathophysiology of bradykinin receptors.

Copyright © by The American Society for Pharmacology and Experimental Therapeutics


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