An aqueous extract of Zingiber officinale Roscoe protects mouse primary hepatic cells against hydrogen peroxide-induced oxidative stress
2012
Oh, S.Y., Korea Institute of Oriental Medicine, Daejeon, Republic of Korea | Lee, J.H., Korea Institute of Oriental Medicine, Daejeon, Republic of Korea | Lee, J.S., Korea Institute of Oriental Medicine, Daejeon, Republic of Korea | Seo, S.H., Korea Institute of Oriental Medicine, Daejeon, Republic of Korea | Ma, J.Y., Korea Institute of Oriental Medicine, Daejeon, Republic of Korea
Hepatocytes exposed to an oxidative stressor such as hydrogen peroxide (H₂O₂) are potentially sensitized to cell death; thus, reactive oxygen species (ROS) are considered to be critical mediators of liver damage. Zingiber officinale Roscoe (ZO), also known as ginger, is cultivated commercially in China, India, Korea, and other parts of the world. In addition, it is used as a spice and flavoring agent and is also purported to possess a number of medicinal properties. In the present study, we examined the protective effect of ZO against cell damage caused by H₂O₂-induced oxidative stress. ZO reduced H₂O₂-induced apoptotic signals and the levels of intracellular ROS. ZO pretreatment also increased the phosphorylation of c-Jun, and JNK kinase. The expression of heme oxygenase-1 (HO-1) and heat shock protein 72 (HSP72) were increased by ZO pretreatment more than H₂O₂ treatment. In addition, siRNA-mediated knockdown of HO-1 and HSP72 decreased protective effect of ZO pretreatment. Our data suggest that ZO decreases ROS levels and the expressions of HO-1 and HSP72 are involved in the hepatocyte protective function of ZO against H₂O₂.
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