Transgenic mouse model expressing P53(R172H), luciferase, EGFP, and KRAS(G12D) in a single open reading frame for live imaging of tumor.

Abstract:

:Genetically engineered mouse cancer models allow tumors to be imaged in vivo via co-expression of a reporter gene with a tumor-initiating gene. However, differential transcriptional and translational regulation between the tumor-initiating gene and the reporter gene can result in inconsistency between the actual tumor size and the size indicated by the imaging assay. To overcome this limitation, we developed a transgenic mouse in which two oncogenes, encoding P53(R172H) and KRAS(G12D), are expressed together with two reporter genes, encoding enhanced green fluorescent protein (EGFP) and firefly luciferase, in a single open reading frame following Cre-mediated DNA excision. Systemic administration of adenovirus encoding Cre to these mice induced specific transgene expression in the liver. Repeated bioluminescence imaging of the mice revealed a continuous increase in the bioluminescent signal over time. A strong correlation was found between the bioluminescent signal and actual tumor size. Interestingly, all liver tumors induced by P53(R172H) and KRAS(G12D) in the model were hepatocellular adenomas. The mouse model was also used to trace cell proliferation in the epidermis via live fluorescence imaging. We anticipate that the transgenic mouse model will be useful for imaging tumor development in vivo and for investigating the oncogenic collaboration between P53(R172H) and KRAS(G12D).

journal_name

Sci Rep

journal_title

Scientific reports

authors

Ju HL,Calvisi DF,Moon H,Baek S,Ribback S,Dombrowski F,Cho KJ,Chung SI,Han KH,Ro SW

doi

10.1038/srep08053

subject

Has Abstract

pub_date

2015-01-27 00:00:00

pages

8053

issn

2045-2322

pii

srep08053

journal_volume

5

pub_type

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