Protein & Peptide Letters 2005-05-01

[TIC4]endomorphins, analogues of endomorphins, have significantly enhanced vasorelaxant effects in rat aorta rings.

Qian-Yu Zhao, Qiang Chen, Yun Feng, Xin Lin, Rui Wang

Index: Protein Pept. Lett. 12(4) , 323-6, (2005)

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Abstract

[Tic(4)]EM1 and [Tic(4)]EM2, new endomorphins (EMs) analogues, caused relaxation of rat aorta rings precontracted with phenylphrine in a concentration-dependent manner and were 240- to 370-fold more potent than EMs. This effect was inhibited by endothelium removal or by incubation with NO synthase inhibitor L-NNA or opioid receptor antagonist naloxone. The results demonstrate that [Tic(4)]EMs have NO- and endothelium-dependent vasorelaxant effects which are mediated by the opioid receptor.