کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1919659 | 1535670 | 2007 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Age-related HMG-CoA reductase deregulation depends on ROS-induced p38 activation Age-related HMG-CoA reductase deregulation depends on ROS-induced p38 activation](/preview/png/1919659.png)
BackgroundIt seems to be clear that hepatic age-related HMG-CoA reductase total activation is connected to a rise of reactive oxygen species (ROS). However, the mechanism by which ROS achieve this effect is unknown. Thus, in this work, we have performed a study of HMG-CoAR by analyzing the enzymes involved in its short-term regulation, namely, AMP-activated kinase (AMPK) and protein phosphatase 2A (PP2A).Methods and materialsIn the liver of aged rats and in H2O2-stimulated HepG2 cells the ROS content, the HMG-CoA reductase activation state, its regulatory enzymes and the p38 downstream pathway involved in reductase deregulation, have been studied.Results and conclusionsOur data show that the hepatic HMG-CoAR is completely dephosphorylated in the liver of old rat being the PP2A increased association with HMG-CoAR the main responsible. On the other hand, the age-related greater association between PP2A and HMG-CoAR results to be due to an increase in ROS that is present during aging and has already been demonstrated to influence HMG-CoAR activation state. Moreover, H2O2-stimulated HepG2 cell line shows that the ROS effect on the HMG-CoAR dephosphorylation is mediated by the activation of p38/MAPK pathway.
Journal: Mechanisms of Ageing and Development - Volume 128, Issues 11–12, November–December 2007, Pages 688–695