Transgenic Expression of Walleye Dermal Sarcoma Virus Rv-cyclin Gene in Zebrafish and Its Suppressive Effect on Liver Tumor Development After Carcinogen Treatment

Overview

Journal Mar Biotechnol (NY)

Specialties Biology
Biotechnology

Date 2010 Jan 7

PMID 20052603

Citations 8

Authors

Huiqing Zhan

Jan M Spitsbergen

Wei Qing

Yi Lian Wu

Thomas A Paul

James W Casey

Guor Muor Her

Zhiyuan Gong

Affiliations

Soon will be listed here.

Abstract

A retrovirus homologue gene of cellular cyclin D₁, walleye dermal sarcoma virus rv-cyclin gene (orf A or rv-cyclin), was expressed in the livers of zebrafish under the control of liver fatty acid-binding protein (lfabp) promoter. To prevent possible fatality caused by overexpression of the oncogene, the GAL4/upstream activation sequence (GAL4/UAS) system was used to maintain the transgenic lines. Thus, both GAL4-activator [Tg(lfabp:GAL4)] and UAS-effector [Tg(UAS:rvcyclin)] lines were generated, and the rv-cyclin gene was activated in the liver after crossing these two lines. Since no obvious neoplasia phenotypes were observed in the double-transgenic line, cancer susceptibility of the transgenic fish expressing rv-cyclin was tested by carcinogen treatment. Unexpectedly, transgenic fish expressing rv-cyclin gene (rvcyclin+) were more resistant to the carcinogen than siblings not expressing this gene (rvcyclin-). Lower incidences of multiple and malignant liver tumors were observed in rvcyclin+ than in rvcyclin- fish, and the liver tumors in the rvcyclin+ group appeared later and were less malignant. These results suggest that expression of rv-cyclin protects the fish liver from carcinogen damage and delays onset of malignancy. These findings indicate that transgenic fish models are powerful systems for investigating mechanisms of inhibition and regression of liver tumors.

Citing Articles

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