期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 278, 期 37, 页码 35458-35464出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M301987200
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资金
- NCI NIH HHS [CA98628, CA97098] Funding Source: Medline
The DF3/MUC1 transmembrane oncoprotein is aberrantly overexpressed by most human carcinomas. Certain insights are available regarding a role for MUC1 in intracellular signaling; however, no precise function has been ascribed to this molecule. The present results demonstrate that MUC1 expression is up-regulated by oxidative stress and that this response is mediated by activation of MUC1 gene transcription. A role for MUC1 in the oxidative stress response is supported by the demonstration that MUC1 expression is associated with attenuation of endogenous and H2O2-induced intracellular levels of reactive oxygen species (ROS). MUC1-dependent regulation of ROS is mediated at least in part by up-regulation of anti-oxidant enzyme ( superoxide dismutase, catalase, and glutathione peroxidase) expression. In concert with these findings, we show that the apoptotic response to oxidative stress is attenuated by a MUC1-dependent mechanism. These results support a model in which activation of MUC1 by oxidative stress provides a protective function against increased intracellular oxidant levels and ROS-induced apoptosis.
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