A comparing study of aortic function between renal hyper-tension rat and renal hypertensive-hyperlipidemia rat / 中国药理学通报

ABSTRACT

Aim To investigate the difference of aortic function between renal hypertension rat(2K1C) and renal hypertensive-hyperlipidemia rat(RHHR).Methods Animals were divided into 3 groups the sham-operated group,RHHR and 2K1C model groups.The vascular function test was performed in vitro.The response of aortic ring to phenylephrine(PE),acetylcholine(ACh) and sodium nitroprusside(SNP) was measured.Then aortic ring was incubated with nitricoxide synthase inhibitor N-nitro-L-arginine-methyl-ester(L-NAME) and its response to Ach was observed.Results The contraction in response to PE was augmented in the two model groups.ACh-induced vasorelaxation was reduced in both model groups,and such relaxation was more depressed in RHHR than that in 2K1C.The ability of relaxation evoked by NO was impaired in two model groups.SNP elicited complete relaxation in three groups,but the sensitivity to SNP was more decreased in RHHR than those in sham-operated and 2K1C groups.Conclusion These findings suggest that the vasodilation function of aorta is more impaired in RHHR than that in 2K1C group.The decrease in utilization of vascular smooth muscle to NO induced by hyperlipidemia may contribute to the main cause.