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Vascular endothelial dysfunction has been demonstrated in metabolic syndrome (MS). Chronic administration of rosiglitazone ameliorates endothelial dysfunction through PPAR  γ  -mediated metabolic improvements. Recently, studies suggested that single dose of rosiglitazone also has direct vascular effects, but the mechanisms remain uncertain. Here we established a diet-induced rat model of MS. The impaired vasorelaxation in MS rats was improved by incubating arteries with rosiglitazone for one hour. Importantly, this effect was blocked by either inhibition of PPAR  γ   or PPAR  δ  . In cultured endothelial cells, acute treatment with rosiglitazone increased the phosphorylation of Akt and eNOS and the production of NO. These effects were also abolished by inhibition of PPAR  γ  , PPAR  δ  , or PI3K. In conclusion, rosiglitazone improved endothelial function through both PPAR  γ  - and PPAR  δ  -mediated phosphorylation of Akt and eNOS, which might help to reconsider the complex effects and clinical applications of rosiglitazone.

ppar research

Rosiglitazone Restores Endothelial Dysfunction in a Rat Model of Metabolic Syndrome through PPAR<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo mathvariant="bold">γ</mml:mo></mml:mrow></mml:math>- and PPAR<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo mathvariant="bold">δ</mml:mo></mml:mrow></mml:math>-Dependent Phosphorylation of Akt and eNOS

Rosiglitazone Restores Endothelial Dysfunction in a Rat Model of Metabolic Syndrome through PPARγ- and PPARδ-Dependent Phosphorylation of Akt and eNOS