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Objective: Hypercholesterolemia can cause damage to the artery before the atherosclerotic lesion has formed.Intermedin (IMD) is a novel member of the calcitonin gene-related peptide family.Endogenous IMD is reported to participate in several cardiovascular pathological states.Using the rats fed with high-cholesterol diet, this study aims to investigate the aortic expression of IMD and its receptors in hypercholesterolemia without atherosclerosis.Furthermore, by the antioxidant intervention, we also explore the influence of oxidative stress.