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Eur J Pharmacol. 1998 Oct 9;358(3):229-33.

Chymase processes big-endothelin-2 to endothelin-2-(1-31) that induces contractile responses in the isolated monkey trachea.

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Department of Pharmacology, Osaka Medical College, Takatsuki, Japan.


Purified monkey chymase cleaved the Tyr31-Gly32 bond of big-endothelin-1 and big-endothelin-2 to yield endothelin-1-(1-31) and endothelin-2-(1-31), respectively. In the isolated monkey trachea, endothelin-1-(1-31) and endothelin-2-(1-31), as well as big-endothelin-1 and big-endothelin-2, induced contractile responses. Chymostatin, which inhibits chymase, suppressed the contractile response induced by big-endothelin-2 to 16.6% but not the responses induced by big-endothelin-1, endothelin-1-(1-31) and endothelin-2-(1-31). These results suggest that the contractile response of big-endothelin-2 is predominantly dependent on the conversion of big-endothelin-2 to endothelin-2-(1-31) by chymase.

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