Propolis suppresses CdCl₂-induced cytotoxicity of COS7 cells through the prevention of intracellular reactive oxygen species accumulation.
Propolis is a natural product made by honeybees and contains various compounds, including flavonoids, amino acids and fatty acids. These compounds are considered to have antiviral, antibacterial and antioxidative properties. On the other hand, cadmium (Cd), an industrial and environmental pollutant, preferentially accumulates in the kidney and induces kidney injury. We previously reported that exposure to CdCl₂ induced cell death though intracellular reactive oxygen species (ROS) generation in kidney tubule epithelial COS7 cells. Here, we investigated whether propolis extracts suppress CdCl₂-induced cytotoxicity. Predictably, pretreatment with propolis extracts significantly suppressed CdCl₂-induced cytotoxicity and intracellular ROS generation. Propolis extracts not only showed superoxide dismutase and antioxidative activities, but also increased the expression of heme oxygenase-1 (HO-1), an antioxidative enzyme. Moreover, we determined the involvement of hypoxia inducible factor-1α in propolis extract-derived HO-1 induction. We demonstrate for the first time the utility of propolis for Cd-related COS7 cytotoxicity, and these novel findings are considered to contribute to the control of ROS-derived disorders.
Laboratory of Clinical Pharmaceutics, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan. tekamiya@gifu-pu.ac.jp
Tetsuro
T
Kamiya
Misato
M
Izumi
Hirokazu
H
Hara
Tetsuo
T
Adachi
D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D019556:COS Cells; D019256:Cadmium Chloride / Q000633:toxicity*; D002470:Cell Survival / Q000187:drug effects; D002522:Chlorocebus aethiops; D045424:Complex Mixtures / Q000494:pharmacology*; D004785:Environmental Pollutants / Q000633:toxicity*; D051547:Heme Oxygenase-1 / Q000235:genetics; D011429:Propolis; D012333:RNA, Messenger / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
D000975:Antioxidants; D045424:Complex Mixtures; D004785:Environmental Pollutants; D012333:RNA, Messenger; D017382:Reactive Oxygen Species; D011429:Propolis; D051547:Heme Oxygenase-1; D013482:Superoxide Dismutase; D019256:Cadmium Chloride