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http://dx.doi.org/10.5352/JLS.2013.23.8.1057

Induction of Apoptosis by Citri Pericarpium Methanol Extract through Reactive Oxygen Species Generation in U937 Human Leukemia Cells  

Kim, Ga Hee (Department of Biochemistry, Dongeui University College of Oriental Medicine)
Lee, Moon Hee (Department of Biochemistry, Dongeui University College of Oriental Medicine)
Han, Min Ho (Department of Biochemistry, Dongeui University College of Oriental Medicine)
Park, Cheol (Department of Molecular Biology, College of Natural Sciences, Dongeui University)
Hong, Su Hyun (Department of Biochemistry, Dongeui University College of Oriental Medicine)
Choi, Yung Hyun (Department of Biochemistry, Dongeui University College of Oriental Medicine)
Publication Information
Journal of Life Science / v.23, no.8, 2013 , pp. 1057-1063 More about this Journal
Abstract
Citri Pericarpium is one of the most commonly used traditional herbal medicines in Korea, China, and Japan. Its extracts have many properties including the treatment of indigestion and inflammatory respiratory syndromes such as bronchitis and asthma. However, the underlying molecular mechanisms of anti-cancer activity and molecular targets are not fully understood. In this work, we investigated the anti-proliferative activity of Citri Pericapium (EMCP) methanol extract on reactive oxygen species (ROS) production and the association of these effects with apoptotic cell death using U937 human leukemia cells in vitro. EMCP treatment decreased cell proliferation in a dose-dependent manner following an increase of the sub-G1 phase, the down-regulation of Bax proteins, the activation of caspases, the degradation of poly (ADP-ribose) polymerase proteins (PARP), and the induction of ROS generation. However, the quenching of ROS generation by N-acetyl-L-cysteine administration, a scavenger of ROS, reversed the EMCP-induced apoptosis effects. In addition, heme oxygenase-1 expression also recovered by inhibiting the nuclear translocation of phosphorylated NF-E2-related factor 2. Taken together, our data indicate that ROS are involved as key mediators in the early molecular events in the EMCP-induced apoptotic pathway.
Keywords
Citri Pericapium; apoptosis; reactive oxygen species; heme oxygenase-1; NF-E2-related factor 2;
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