Involvement of JNKs and p38-MAPK/MSK1 pathways in H2O2-induced upregulation of heme oxygenase-1 mRNA in H9c2 cells

Cellular Signalling
Ioanna-Katerina S AggeliIsidoros Beis

Abstract

One of the most important challenges that cardiomyocytes experience is an increase in the levels of reactive oxygen species (ROS), i.e., during ischemia, reperfusion as well as in the failing myocardium. HOX-1 has been found to protect cells and tissues against oxidative damage; therefore, we decided to study the signalling cascades involved in its transcriptional regulation. HOX-1 mRNA levels were found to be maximally induced after 6h of treatment with 200 microM H2O2 and remained elevated for at least 24h. Inhibition of JNKs, p38-MAPK and MSK1 pathways, by pharmacological inhibitors, reduced HOX-1 mRNA levels in H2O2-treated H9c2 cells. In parallel, we observed that all three subfamilies of the mitogen-activated protein kinases (MAPKs) attained their maximal phosphorylation levels at 5-15 min of H2O2 treatment, with mitogen- and stress-activated-protein kinase 1 (MSK1) also being maximally phosphorylated at 15 min. H2O2-induced MSK1 phosphorylation was completely abrogated in the presence of the selective p38-MAPK inhibitor SB203580. In an effort to define possible substrates of MSK1, we found that ATF2 as well as cJun phosphorylation were equally induced after 30 min and 60 min, respectively, a response inhibited by SP60012...Continue Reading

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