Journal
CLINICAL CANCER RESEARCH
Volume 17, Issue 2, Pages 206-211Publisher
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/1078-0432.CCR-10-0434
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Insulin receptor substrates (IRS) serve as downstream messengers from activated cell surface receptors to numerous signaling pathway cascades. One of these pathways, phosphoinositide 3-kinase (PI3K), frequently displays aberrant function in the setting of cancer. IRS proteins are capable of both regulating and activating PI3K, depending on the cell of origin. As such, both prohost and protumor functions have been described for IRS proteins in human cancers. IRS proteins may eventually serve as biomarkers of PI3K activity, and serve a much-needed role as a guide to using targeted pathway therapy. Additionally, IRS-1 could be indirectly targeted in lung cancer, by inhibiting neutrophil elastase, which functions to degrade IRS-1 in lung tumor cells, thereby generating PI3K hyperactivity. Clin Cancer Res; 17(2); 206-11. (C)2010 AACR.
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