| First Author | Chung SS | Year | 2009 |
| Journal | Mol Cell Biol | Volume | 29 |
| Issue | 1 | Pages | 20-30 |
| PubMed ID | 18936159 | Mgi Jnum | J:144551 |
| Mgi Id | MGI:3831210 | Doi | 10.1128/MCB.00544-08 |
| Citation | Chung SS, et al. (2009) Glutathione peroxidase 3 mediates the antioxidant effect of peroxisome proliferator-activated receptor gamma in human skeletal muscle cells. Mol Cell Biol 29(1):20-30 |
| abstractText | Oxidative stress plays an important role in the pathogenesis of insulin resistance and type 2 diabetes mellitus and in diabetic vascular complications. Thiazolidinediones (TZDs), a class of peroxisome proliferator-activated receptor gamma (PPARgamma) agonists, improve insulin sensitivity and are currently used for the treatment of type 2 diabetes mellitus. Here, we show that TZD prevents oxidative stress-induced insulin resistance in human skeletal muscle cells, as indicated by the increase in insulin-stimulated glucose uptake and insulin signaling. Importantly, TZD-mediated activation of PPARgamma induces gene expression of glutathione peroxidase 3 (GPx3), which reduces extracellular H(2)O(2) levels causing insulin resistance in skeletal muscle cells. Inhibition of GPx3 expression prevents the antioxidant effects of TZDs on insulin action in oxidative stress-induced insulin-resistant cells, suggesting that GPx3 is required for the regulation of PPARgamma-mediated antioxidant effects. Furthermore, reduced plasma GPx3 levels were found in patients with type 2 diabetes mellitus and in db/db/DIO mice. Collectively, these results suggest that the antioxidant effect of PPARgamma is exclusively mediated by GPx3 and further imply that GPx3 may be a therapeutic target for insulin resistance and diabetes mellitus. |
