cardiovascular-agents and pimagedine

Topics: Arteries; Cardiovascular Agents; Cardiovascular Diseases; Glycation End Products, Advanced; Guanidines; Hypertension

We examined endothelium-dependent relaxation in the aortas and renal arteries of Otsuka Long-Evans Tokushima Fatty (OLETF) rats, a model of non-insulin-dependent diabetes mellitus, in comparison with non-diabetic Long-Evans Tokushima Otsuka rats as controls. Acetylcholine-induced relaxation in both arteries was attenuated, and the attenuation was restored to the control level by indomethacin. The relaxation was inhibited completely in the aortas, but only partially in renal arteries by N(G)-nitro-L-arginine methyl ester, and the degree of the latter inhibition was greater in OLETF rats than in the controls. The relaxation was inhibited by aminoguanidine in both arteries of OLETF rats but not in the controls. Serum NO(2) plus NO(3) levels significantly increased in OLETF rats. These results suggest that impairment of relaxation in OLETF rat arteries is due to increased release of contractile factors but not decreased release of nitric oxide.

Topics: Acetylcholine; Animals; Aorta; Biological Factors; Blood Glucose; Body Weight; Cardiovascular Agents; Charybdotoxin; Diabetes Mellitus, Type 2; Drug Interactions; Endothelium, Vascular; Enzyme Inhibitors; Guanidines; In Vitro Techniques; Indomethacin; Lipids; NG-Nitroarginine Methyl Ester; Nitrates; Nitric Oxide; Nitrites; Rats; Rats, Inbred OLETF; Renal Artery; Vasodilation