Antioxidative effect of aspirin on vascular function of aged ovariectomized rats.

This study investigated the vascular effects of nonsteroidal anti-inflammatory drugs (NSAIDs) in the very late stage of postmenopausal vascular aging and looked for a better choice of anti-inflammatory drug for women in reducing the cardiovascular risk by decreasing the oxidant status in this term. The rat aorta isolated from young and old rats that were treated with either aspirin (10 mg/kg/day) or indomethacin (INDO, 1 mg/kg/day) within last 10 weeks after 16-month overiectomy (OVX) follow-up. Endothelium-dependant acetylcholine (Ach, 0.001-30 μM) and independent sodium nitroprusside (SNP, 0.0001-3 μM) relaxant; α-receptor phenylephrine (PE, 0.001-30 μM) and voltage-dependant high potassium (KCl; 40 mM) contractile responses were assessed. Total oxidant and antioxidant status were measured from the serum samples. Aged OVX rat's both aortic endothelium and smooth muscle relaxation were significantly less than of younger ones, whereas their contractile functions tended to decrease. INDO did not treat the Ach, SNP responses, whereas it increased the PE and KCl contractility. Aspirin improved the relaxation function and antioxidant capacity and decreased the oxidant status. These data demonstrate that even if they are in the very late stage of life and menopause, the analgesic choices could restore the well established endothelial dysfunction, vascular stiffness, and oxidant status.