Rosiglitazone improved endothelium-dependent vasodilatation and reduced oxidative and nitrative stress in hypercholesterolemic rabbits.
RCT
Randomized
Does rosiglitazone improve endothelial function and reduce oxidative and nitrative stress in hypercholesterolemic rabbits?
Rosiglitazone exerts vascular protective effects in hypercholesterolemia by attenuating oxidative and nitrative stress, improving endothelial function.
BACKGROUND: Peroxisome proliferator-activated receptor (PPAR) signaling pathways have been reported to exert anti-inflammatory effects and attenuate atherosclerosis formation. However, the mechanisms responsible for their anti-inflammatory and antiatherosclerotic effects remain largely unknown. The present study tested the hypothesis that a PPARgamma agonist may exert significant endothelial protection by antioxidative and antinitrative effects. METHODS AND RESULTS: Male New Zealand White rabbits were randomized to receive a normal (control) or a high-cholesterol diet and treated with vehicle or rosiglitazone (a PPARgamma agonist) 3 mg x kg(-1) x d(-1) for 5 weeks beginning 3 weeks after the high-cholesterol diet. At the end of 8 weeks of a high-cholesterol diet, the rabbits were killed, and the carotid arteries were isolated. Bioactive nitric oxide was determined functionally (endothelium-dependent vasodilatation) and biochemically (the phosphorylation of vasodilator-stimulated phosphoprotein, or P-VASP). Vascular superoxide production, PPARgamma, gp91phox, and inducible nitric oxide synthase (iNOS) expression, and vascular ONOO- formation were determined. Hypercholesterolemia caused severe endothelial dysfunction and reduced P-VASP, despite a marked increase in iNOS expression and total NOx production. Treatment with rosiglitazone enhanced PPARgamma expression, improved endothelium-dependent vasodilatation, preserved P-VASP, suppressed gp91phox and iNOS expression, reduced superoxide and total NOx production, and inhibited nitrotyrosine formation. CONCLUSIONS: The PPARgamma agonist rosiglitazone exerted a significant vascular protective effect in hypercholesterolemic rabbits, most likely by attenuation of oxidative and nitrative stresses. The endothelial protective effects of PPARgamma agonists may reduce leukocyte accumulation in vascular walls and contribute to their antiatherosclerotic effect.
Tao et al. (Tue,) conducted a rct in Hypercholesterolemia. Rosiglitazone vs. Vehicle was evaluated on Endothelium-dependent vasodilatation and biochemical markers of oxidative and nitrative stress. Rosiglitazone improved endothelium-dependent vasodilatation and reduced oxidative and nitrative stress in hypercholesterolemic rabbits.