PPARδ activation protects endothelial function in diabetic mice
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AbstractRecent evidence highlights the therapeutic potential of peroxisome proliferator-activated receptor-δ (PPARδ) agonists to increase insulin sensitivity in diabetes. However, the role of PPARd in regulating vascular function is incompletely characterized. We investigate whether PPARδ activation improves endothelial function in diabetic and obese mice. PPARδ knockout (KO) and wild-type (WT) mice fed with high-fat diet and db/db mice were used as diabetic mouse models, compared with PPARδ KO and WT mice on normal diet and db/m+ mice. Endothelium-dependent relaxation (EDR) was measured by wire myograph. Flow-mediated vasodilatation (FMD) was measured by pressure myograph. Nitric oxide (NO) production was examined in primary endothelial cells from mouse aortae. PPARδ agonist GW1516 restored EDRs in mouse aortae under high-glucose conditions or in db/db mouse aortae ex vivo. After oral treatment with GW1516, EDRs in aortae and FMDs in mesenteric resistance arteries were improved in obese mice in a PPARδ-specific manner. The effects of GW1516 on endothelial function were mediated through phosphatidylinositol 3-kinase (PI3K) and Akt with a subsequent increase of endothelial nitric oxide synthase (eNOS) activity and NO production. The current study demonstrates an endothelial-protective effect of PPARδ agonists in diabetic mice through PI3K/Akt/eNOS signaling, suggesting the therapeutic potential of PPARδ agonists for diabetic vasculopathy. © 2012 by the American Diabetes Association.
All Author(s) ListTian X.Y., Wong W.T., Wang N., Lu Y., Cheang W.S., Liu J., Liu L., Liu Y., Lee S.S.-T., Chen Z.Y., Cooke J.P., Yao X., Huang Y.
Journal nameDiabetes
Year2012
Month12
Day1
Volume Number61
Issue Number12
PublisherAmerican Diabetes Association
Place of PublicationUnited States
Pages3285 - 3293
ISSN0012-1797
eISSN1939-327X
LanguagesEnglish-United Kingdom

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