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RESEARCH COMMUNICATION |
a INSERM U-466 and Biochemistry Department, Institut Louis Bugnard, CHU Rangueil, Toulouse, France
b Institute of Medical Biochemistry, Karl-Franzen Universität Graz, Graz, Austria
Oxidized low density lipoproteins (oxLDL) are thought to play a major role in atherosclerosis. OxLDL exhibit a wide variety of biological effects resulting from their ability to interfere with intracellular signaling. The cellular targets and primary signaling events of oxLDL are unknown. We report that oxLDL elicit, in intact cells, tyrosine phosphorylation of the epithelial growth factor receptor (EGFR) and activation of its signaling pathway. This activation triggered by oxLDL was associated with derivatization of reactive amino groups of EGFR and was mimicked by 4-hydroxynonenal (4-HNE, a major lipid peroxidation product of oxLDL). Immunopurified EGFR was derivatized and activated in vitro by oxLDL lipid extracts and 4-HNE, thus indicating that 1) EGFR may be a primary target of oxidized lipids and 2) EGFR derivatization may be associated with activation. The reported data suggest that EGFR acts as a sensor for oxidized lipids. We therefore propose a novel concept of the mechanism by which oxidized lipids (contained in oxLDL or more generally produced during oxidative stress) are able to activate receptor tyrosine kinase and subsequent signaling pathways, resulting finally in a gain of function.—Suc, I., Meilhac, O., Lajoie-Mazenc, I., Vandaele, J., Jürgens, G., Salvayre, R., Nègre-Salvayre, A. Activation of EGF receptor by oxidized LDL. FASEB J. 12, 665–671 (1998)
Key Words: signaling • 4-hydroxynonenal • tyrosine phosphorylation
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