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- W2009366295 abstract "It has been demonstrated that co-expression of c-myc and transforming growth factor alpha (TGF-alpha) as transgenes in the mouse liver results in a tremendous acceleration of neoplastic development in this organ as compared to expression of either transgene alone [Murakami, H., et al. (1993) Cancer Res., 53, 1719-1723]. In order to clarify the roles of transgenes and additional other genetic alterations during hepatocarcinogenesis, we analyzed liver tumors developed in albumin/c-myc transgenic mice and albumin/c-myc and MT-1/TGF-alpha double transgenic mice. High expression of TGF-alpha transgene was found in nine of 14 (64%) liver tumors in double transgenic mice, suggesting that TGF-alpha overexpression confers growth advantage during hepatocarcinogenesis. Only one of 14 (7%) liver tumors in double transgenic mice and none of 13 liver tumors in c-myc transgenic mice showed overexpression of insulin-like growth factor II (IGF-II). This result was in contrast to the report by Takagi et al. [Takagi, H., et al. (1992) Cancer Res., 52, 5171-5177] which showed overexpression of IGF-II in 75% of liver tumors in TGF-alpha transgenic mice and suggested that the presence of c-myc transgenes together with TGF-alpha from an early stage of hepatocarcinogenesis may lead to different carcinogenic pathways which are independent of IGF-II overexpression. Expression of c-myc transgene was found in most of the liver tumors, but at lower levels than non-tumorous parts of the liver in c-myc and double transgenic mice. These results suggest that c-myc transgene expression cooperates with TGF-alpha in the early stages of hepatocarcinogenesis but has growth disadvantage in later stages of hepatocarcinogenesis. There was no evidence of mutational activation of the H-ras gene or mutational inactivation of the p53 gene in any liver tumors developed in c-myc or double transgenic mice." @default.
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- W2009366295 title "Molecular analyses of liver tumors in c-myc transgenic mice and c-myc and TGF-α double transgenic mice" @default.
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- W2009366295 doi "https://doi.org/10.1016/0304-3835(96)04299-1" @default.
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