Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 277, Issue 46, Pages 43730-43734Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M207951200
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Oxidative stress induces JNK activation, which leads to apoptosis through mitochondria-dependent caspase activation. However, little is known about the mechanism by which JNK alters mitochondrial function. In this study, we investigated the role of phosphorylation of myeloid cell leukemia I (Mcl-1), an anti-apoptotic member of the Bcl-2 family, in oxidative stress-induced apoptosis. We found that JNK phosphorylated Ser-121 and Thr-163 of Mcl-1 in response to stimulation with H2O2 and that transfection of unphosphorylatable Mcl-1 resulted in an enhanced anti-apoptotic activity in response to stimulation with H2O2. JNK-dependent phosphorylation and thus inactivation of Mcl-1 may be one of the mechanisms through which oxidative stress induces cellular damage.
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