Human Hep G2 cells as a model to examine induction of quinone reductase

G. Williamson, B. Wang, C. Symms

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The use of cultured human hepatoma Hep G2 cells as a model to identify inducers of the phase II enzyme quinone reductase is examined. Cells were transiently transfected with a plasmid (pWNQO1tkCAT4.61kb) containing functional sequences in the 5'-flanking region of the human quinone reductase (NQO1) gene. In this plasmid, the nucleotides -587 to -379, containing a functional ARE, are linked to a CAT reporter. Benzylisothiocyanate, a known inducer of quinone reductase in animal models and in hepa1c1c7 cells, increased expression of the reporter gene after transient transfection into Hep G2 cells by up to 5.5-fold (at 1 μM benzylisothiocyanate). In untransfected cells, this concentration of benzylisothiocyanate gave a small and not significant induction of quinone reductase activity (1.3-fold). The specific activity of quinone reductase in uninduced Hep G2 cells is 10-fold higher than found in the uninduced mouse hepatoma Hepa1c1c7 cell line. These preliminary results suggest that transfection of pWNQO1tkCAT4.61kb into Hep G2 cells may be a suitable method to determine which compounds have the potential to induce QR transcription in humans.

Original languageEnglish
Pages (from-to)81-84
Number of pages4
JournalIn Vitro Toxicology
Volume10
Issue number1
Publication statusPublished - 1 Jan 1997
Externally publishedYes

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