Objective:To investigate the effect of liraglutide on the rat isolated aorta ring in norepinephrine(NE) pre-contracted condition.Methods and materials:The isolated rat aortic rings were mounted in an organ bath and measured of isometric force. The vasodilation reaction of liraglutide on NE(10-6mol·L-1)-precontracted rings was observed, the effect of liraglutide on the aorta ring pre-contracted by the inhibitors of e NOS-NG-Nitro-L-arginine-Methyl-Ester(L-NAME,.10-4mol·L-1) and ATP-sensitive-potassium(KATP)-...