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- W1993435982 abstract "In an attempt to elucidate the mechanism by which c-myc and transforming growth factor-alpha (TGF-alpha) cooperate in hepatocyte tumor development, we have analyzed signaling by the epidermal growth factor (EGF) receptor and the consequent regulation of receptor number in transgenic mice bearing the c-myc transgene under the control of the albumin enhancer/promoter. 125I-EGF binding and Scatchard analysis indicated a single class of high affinity receptors with the total number of binding sites of 1.2 X 10(4) +/- 600 and 2.5 X 10(5) +/- 1000 sites/cell in the normal and c-myc hepatocytes in primary culture, respectively. After 72 h of EGF exposure in culture, the number of detectable EGF receptors on the cell surface of the c-myc hepatocytes was not reduced, whereas the number of EGF receptors on normal hepatocytes was reduced to 32% that of untreated hepatocytes. Nuclear run-on experiments done with nuclei isolated from intact livers demonstrated that transcription of the EGF receptor was 4.9-fold higher in c-myc mice. Increased levels of the transcriptional factor SP1 in the c-myc hepatocytes in vivo and in primary culture, suggest a mechanism for the increased transcription of the EGF receptor. c-myc also increases the expression of TGF-alpha; a consequent increase in tyrosine phosphorylation is also detected in vivo. Thus, the increased number of EGF receptors in c-myc expressing hepatocytes, even after prolonged exposure to EGF, or TGF-alpha in vivo, may allow greater triggering of the EGF receptor signaling cascade." @default.
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- W1993435982 date "1997-03-15" @default.
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- W1993435982 title "Aberrant expression and regulation of hepatic epidermal growth factor receptor in a c-myc transgenic mouse model" @default.
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- W1993435982 doi "https://doi.org/10.1002/(sici)1097-4644(19970315)64:4<651::aid-jcb13>3.0.co;2-f" @default.
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