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Stable overexpression of arginase I and ornithine transcarbamylase in HepG2 cells improves its ammonia detoxification.

Abstract：

:HepG2 is an immortalized human hepatoma cell line that has been used for research into bioartificial liver systems. However, a low level of ammonia detoxification is its biggest drawback. In this work, a recombinant HepG2 cell line with stable overexpression of human arginase I (hArgI) and human ornithine transcarbamylase (hOTC), HepG2/(hArgI + hOTC)4, was developed using a eukaryotic dual gene expression vector pBudCE4.1. (1) The hArgI and hOTC enzymatic activity in HepG2/(hArgI + hOTC)4 cells were higher than in the control cells. (2) The ammonia tolerance capacity of HepG2/(hArgI + hOTC)4 cells was three times that of HepG2 cells and 37.5% of that of primary human hepatocytes in cultivation. In the experiment of ammonia detoxification, HepG2/(hArgI + hOTC)4 cells produced 3.1 times more urea (at 180 mM NH(4) Cl) and 3.1 times more glutamine (at 120 mM NH(4) Cl and 15 mM glutamate) than HepG2 cells, reaching 63.1% and 36.0% that of primary human hepatocytes, respectively. (3) The hArgI and hOTC overexpression did not influence the growth of HepG2 cells and also promoted the expression of other ammonia detoxification associated proteins including glutamine synthetase (GS), arginase II (ArgII), arginosuccinate synthase (ASS) and arginosuccinate lyase (ASL) in HepG2 cells. This work illustrates that the modification reported here made significant progress in the improvement of HepG2 cell function and the HepG2/(hArgI + hOTC)4 cells will provide a better selection for the application of bioartificial liver system.

journal_name

J Cell Biochem

journal_title

Journal of cellular biochemistry

authors

Tang N,Wang Y,Wang X,Zhou L,Zhang F,Li X,Chen Y

doi

10.1002/jcb.23375

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

518-27

issue

2

eissn

0730-2312

issn

1097-4644

journal_volume

113

pub_type

杂志文章

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