It 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 materials: In 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 conclusions: Our 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 HMGCoAR 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.
PALLOTTINI V, MARTINI C, CAVALLINI G, BERGAMINI E, MUSTARD KJ, & HARDIE DG AND TRENTALANCE A (2007). Age-related HMG-CoA reductase deregulation depends on ROS-induced p38 activation. MECHANISMS OF AGEING AND DEVELOPMENT, 128, 688-695 [10.1016/j.mad.2007.10.001].