Zebrafish Eggs Used As Bioreactors for the Production of Bioactive Tilapia Insulin-like Growth Factors

Overview

Journal Transgenic Res

Specialty Molecular Biology

Date 2010 Apr 8

PMID 20373020

Citations 2

Authors

Shao-Yang Hu

Chia-Hsuan Liao

Yi-Pei Lin

Yen-Hsing Li

Hong-Yi Gong

Gen-Hwa Lin

Koichi Kawakami

Tzu-Hsuan Yang

Jen-Leih Wu

Affiliations

Soon will be listed here.

Abstract

Multiple advantages-including the short generation time, large numbers of fertilized eggs, low cost of cultivation and easy maintenance favor the use of fish as bioreactors for the production of pharmaceutical proteins. In the present study, zebrafish eggs were used as bioreactors to produce mature tilapia insulin-like growth factors (IGFs) proteins using the oocyte-specific zona pellucida (zp3) promoter. The chimeric expression plasmids, pT2-ZP-tIGFs-IRES-hrGFP, in which hrGFP was used as reporter of tilapia IGFs expression, were designed to established Tg (ZP:tIGFs:hrGFP) transgenic lines for the expression of tilapia IGF-1 and IGF-2. Recombinant tilapia IGF-1 and IGF-2 were expressed as soluble forms in cytoplasm of fertilized eggs. The content level of tilapia IGF-1 and IGF-2 were 6.5 and 5.0% of the soluble protein, respectively. Using a simple Ni-NTA affinity chromatography purification process, 0.58 and 0.49 mg of purified tilapia IGF-1 and IGF-2 were obtained, respectively, from 650 fertilized eggs. The biological activity of the purified tilapia IGF-1 and IGF-2 was confirmed via a colorimetric bioassay to monitor the growth stimulation of zebrafish embryonic cells (ZF4), tilapia ovary cells (TO-2) and human osteosarcoma epithelial cells (U2OS). These results demonstrate that the use of zebrafish eggs as bioreactors is a promising approach for the production of biological recombinant proteins.

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