title: Prevention of hydrogen peroxide-induced oxidative stress in PC12 cells by 3,4-dihydroxybenzalacetone isolated from Chaga (Inonotus obliquus (persoon) Pilat).
abstract: Chaga (Inonotus obliquus (persoon) Pilat) is a mushroom traditionally used as a folk medicine for tumors and stomach ulcers in Russia. Previously, we reported the antioxidant potential of Chaga extracts and seven isolated phenolic ingredients. In the present study, we investigated the protective effects of Chaga extracts and other isolated phenolic ingredients against H(2)O(2)-induced oxidative stress in PC12 cells. Intracellular generation of reactive oxygen species (ROS) leads to oxidative stress and subsequent damage of cellular and nuclear components. Chaga extracts and the phenolic ingredients, 3,4-dihydroxybenzalacetone (DBL) and caffeic acid (CA), effectively suppressed intracellular ROS level in H(2)O(2)-treated cells. The H(2)O(2)-induced cell death was more pronounced, effectively prevented in the cells treated with DBL than in cells treated with CA. In addition, ROS activate various signal transduction pathways including the mitogen-activated protein kinase (MAPK) cascade. Therefore, we examined the potentially beneficial effects of DBL on extracellular signal-regulated protein kinase (ERK), c-Jun NH(2)-terminal kinase (JNK), and p38-MAPK signaling activated by H(2)O(2) stimulation. DBL selectively inhibited the phosphorylation of p38-MAPK, without affecting JNK and ERK.
authors: Niigata University of Pharmacy and Applied Life Science, Higashijima, Akiha-ku, Niigata 956-8603, Japan.
authors: Yuki
authors: Y
authors: Nakajima
authors: Hiroshi
authors: H
authors: Nishida
authors: Yutaka
authors: Y
authors: Nakamura
authors: Tetsuya
authors: T
authors: Konishi
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D001487:Basidiomycota / Q000737:chemistry*; D015153:Blotting, Western; D002109:Caffeic Acids / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D016877:Oxidants / Q000494:pharmacology*; D018384:Oxidative Stress / Q000187:drug effects*; D016716:PC12 Cells; D010766:Phosphorylation / Q000187:drug effects; D051381:Rats; D017382:Reactive Oxygen Species / Q000378:metabolism; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: C546059:3,4-dihydroxybenzalacetone; D002109:Caffeic Acids; D016877:Oxidants; D017382:Reactive Oxygen Species; D006861:Hydrogen Peroxide; D048031:JNK Mitogen-Activated Protein Kinases; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D048051:p38 Mitogen-Activated Protein Kinases