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• W2339929150 abstract "Cell growth and migration are essential processes for the differentiation, maintenance, and repair of the intestinal epithelium. Epidermal growth factor (EGF) is an important factor in the reorganization of the cytoskeleton required for both processes. Because we had previously found significant changes in the cytoskeleton during polyamine deficiency, it was of interest to know whether those changes could prevent EGF from stimulating growth and migration. Polyamine biosynthesis in IEC-6 cells was interrupted by treatment with alpha-difluoromethylornithine (DFMO), a specific inhibitor of ornithine decarboxylase, the primary rate-limiting enzyme of polyamine biosynthesis. DFMO halted cell proliferation and inhibited cell migration, and neither function could be normally stimulated by EGF. Immunocytochemistry of the transferrin receptor (used as a marker for the endocytic pathway) revealed an abnormal distribution of the EGF receptor (EGFR) 10 min after binding EGF. Polyamine deficiency depleted the cells of interior microfilaments, thickened the actin cortex, and prevented the prompt association of EGF-bound EGFR with actin. EGF-stimulated 170-kDa protein tyrosine phosphorylation and the kinase activity of purified membrane EGFR were reduced by 50%. Immunoprecipated EGFR protein concentration, however, was not reduced by polyamine deficiency. All of these changes could be prevented by supplementation with putrescine. Cytoskeletal disruption, reduced EGFR phosphorylation and kinase activity, aberrant intracellular EGFR distribution, and delayed association with actin filaments suggest a partial explanation for the dependence of epithelial cell growth and migration on polyamines." @default.
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• W2339929150 date "1998-01-01" @default.
• W2339929150 modified "2023-09-26" @default.
• W2339929150 title "Polyamine deficiency alters EGF receptor distribution and signaling effectiveness in IEC-6 cells" @default.
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• W2339929150 doi "https://doi.org/10.1152/ajpcell.1998.274.1.c192" @default.
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