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To determine the effect on gene expression of trace levels of reactive oxygen species from mitochondria, we used the mRNA differential display technique to compare gene expression in two cell lines: M15, which overexpresses mitochondrial phospholipid hydroperoxide glutathione peroxidase (mtPHGPx), in rat basophilic leukemia RBL-2H3 cells, and a control cell line, S1. We isolated 27 differentially expressed genes, including 10 previously unreported sequences. These genes included cytoskeletal proteins (beta-tubulin, nonmuscle myosin alkali light chain, and vimentin), growth or proliferation regulators [growth differentiation factor 1 (Gdf-1), Rap1a, and inhibitor of growth 3 (Ing3)], and others. Although the expression of most of the isolated genes did not respond to ROS (hydrogen peroxide) or antioxidant (pyrolidine dithiocarbamate) treatment, the expression of Gdf-1 was downregulated by hydrogen peroxide treatment. Thus, low levels of ROS produced in mitochondria during normal cellular metabolism can modulate gene expression.

Alteration of Gene Expressions by the Overexpression of Mitochondrial Phospholipid Hydroperoxide Glutathione Peroxidase (mtPHGPx)