Development of a conditional liver tumor model by mifepristone-inducible Cre recombination to control oncogenic kras V12 expression in transgenic zebrafish

Scientific Reports
Anh Tuan NguyenZhiyuan Gong

Abstract

Here we report a new transgenic expression system by combination of liver-specific expression, mifepristone induction and Cre-loxP recombination to conditionally control the expression of oncogenic kras(V12). This transgenic system allowed expression of kras(V12) specifically in the liver by a brief exposure of mifepristone to induce permanent genomic recombination mediated by the Cre-loxP system. We found that liver tumors were generally induced from multiple foci due to incomplete Cre-loxP recombination, thus mimicking naturally occurring human tumors resulting from one or a few mutated cells and clonal proliferation to form nodules. Similar to our earlier studies by both constitutive and inducible expression of the kras(V12) oncogene, hepatocellular carcinoma (HCC) is the main type of liver tumor induced by kras(V12) expression. Moreover, mixed tumors with hepatocellular adenoma and hepatoblastoma (HB) were also frequently observed. Molecular analyses also indicated similar increase of phosphorylated ERK1/2 in all types of liver tumors, but nuclear localization of β-catenin, a sign of malignant transformation, was found only in HCC and HB. Taken together, our new transgenic system reported in this study allows transgenic kra...Continue Reading

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Citations

Jan 30, 2018·NPJ Precision Oncology·Matteo AstoneLuke H Hoeppner
Aug 2, 2019·Journal of Molecular Cell Biology·Fei FeiXu Wang
Sep 13, 2017·Frontiers in Oncology·Stefanie KirchbergerMartin Distel
Aug 8, 2020·Cancers·Ludivine RabyPierre-Olivier Angrand

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Methods Mentioned

BETA
transgenic
transgenics
PCR

Software Mentioned

GLOBALCAN

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