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. 2003 Nov;43(1-3):121–126. doi: 10.1023/B:CYTO.0000039902.00952.dc

Blockade of Endogenous Reactive Oxygen Species by N-Acetyl-L-Cysteine Suppresses the Invasive Activity of Rat Hepatoma Cells by Modulating the Expression of Hepatocyte Growth Factor Gene

Yutaka Miura 1, Saho Tsukamoto 1, Kazumi Yagasaki 1
PMCID: PMC3449589  PMID: 19003216

Abstract

We have already reported that exogenously added reactive oxygen species (ROS) could potentiate the invasive activity of rat hepatoma cell line of AH109A by activating autocrine loop of hepatocyte growth factor (HGF)-c-Met pathway. In this report, we examined the involvement of endogenous ROS in the invasive activity of hepatoma cells by using a cell-permeable antioxidant, N-acetyl-L-cysteine (NAC). NAC could certainly scavenge intracellular ROS when directly added to the media at the concentration of 1 or 5 mM and could significantly suppress hepatoma cell invasion, although it showed a little effect on hepatoma cell proliferation at these concentrations. NAC also decreased the content of HGF mRNA and the secretion of HGF at these concentrations, leading to suppression of their invasion. In the present study, blockade of endogenous ROS by NAC proved to efficiently suppress the invasive activity of hepatoma cells by down-regulating HGF gene expression, suggesting the importance of endogenous ROS in cellular signaling of tumor cell invasion.

Keywords: antioxidant, hepatoma, HGF, invasion, N-acetyl-L-cysteine

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