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Ginsenoside Rh2 (G-Rh2), a component extracted from roots of ginseng, exhibited anti-cancer pharmacological activities by inhibiting proliferation and inducing apoptosis in lung cancer cells. However, the mechanisms of G-Rh2 suppressing lung cancer development remained elusive. This study tried to investigate the possible mechanism involved in anti-proliferative effect of G-Rh2 in lung cancer cells. As results, G-Rh2 inhibited the proliferation of H1299 cells in a dose-dependent manner by inducing cell apoptosis. Activating transcription factor 4 (ATF4), CCAAT/enhancer-binding protein homologous protein (CHOP), and caspase-4 were involved in G-Rh2-induced apoptosis of H1299 cells. It was also found that G-Rh2 could up-regulate expressions of ATF4, CHOP and caspase-4 in H1299 cells in a dose-dependent manner. In addition, NAC (N-acetylcysteine, a reactive oxygen species (ROS) scavenger) treatment dramatically decreased ROS generation in H1299 cells; both of NAC and 4-PBA (4-phenylbutyrate, a specific endoplasmic reticulum (ER) stress inhibitor) administration impaired apoptosis and expression levels of ATF4, CHOP and caspase-4 in G-Rh2 incubated H1299 cells. In vivo assays extended the significance of these results, showing that G-Rh2 inhibited lung cancer growth and the inhibition effects of G-Rh2 in tumor growth were significantly reduced by inhibition of ER stress. In conclusion, G-Rh2 inhibited proliferation of H1299 cells by inducing ROS mediated ER stress dependent cell apoptosis.

Ginsenoside Rh2 Inhibited Proliferation by Inducing ROS Mediated ER Stress Dependent Apoptosis in Lung Cancer Cells