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- W2056598586 endingPage "e39682" @default.
- W2056598586 startingPage "e39682" @default.
- W2056598586 abstract "The epidermal growth factor receptor (EGFR), which regulates cell growth and survival, is integral to colon tumorigenesis. Lipid rafts play a role in regulating EGFR signaling, and docosahexaenoic acid (DHA) is known to perturb membrane domain organization through changes in lipid rafts. Therefore, we investigated the mechanistic link between EGFR function and DHA. Membrane incorporation of DHA into immortalized colonocytes altered the lateral organization of EGFR. DHA additionally increased EGFR phosphorylation but paradoxically suppressed downstream signaling. Assessment of the EGFR-Ras-ERK1/2 signaling cascade identified Ras GTP binding as the locus of the DHA-induced disruption of signal transduction. DHA also antagonized EGFR signaling capacity by increasing receptor internalization and degradation. DHA suppressed cell proliferation in an EGFR-dependent manner, but cell proliferation could be partially rescued by expression of constitutively active Ras. Feeding chronically-inflamed, carcinogen-injected C57BL/6 mice a fish oil containing diet enriched in DHA recapitulated the effects on the EGFR signaling axis observed in cell culture and additionally suppressed tumor formation. We conclude that DHA-induced alteration in both the lateral and subcellular localization of EGFR culminates in the suppression of EGFR downstream signal transduction, which has implications for the molecular basis of colon cancer prevention by DHA." @default.
- W2056598586 created "2016-06-24" @default.
- W2056598586 creator A5005745021 @default.
- W2056598586 creator A5019568866 @default.
- W2056598586 creator A5067325195 @default.
- W2056598586 date "2012-06-27" @default.
- W2056598586 modified "2023-10-16" @default.
- W2056598586 title "Alteration of EGFR Spatiotemporal Dynamics Suppresses Signal Transduction" @default.
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