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J. Biol. Chem., Vol. 278, Issue 37, 35458-35464, September 12, 2003
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From the Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115
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.
Received for publication, February 25, 2003 , and in revised form, June 12, 2003.
* This work was supported by Grants CA97098 and CA98628 awarded by NCI, National Institutes of Health. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
To whom correspondence should be addressed. E-mail:
Donald_Kufe{at}DFCI.Harvard.edu.
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