A water extract of Curcuma longa L. (Zingiberaceae) rescues PC12 cell death caused by pyrogallol or hypoxia/reoxygenation and attenuates hydrogen peroxide induced injury in PC12 cells.
A number of studies indicate that free radicals are involved in the neurodegeneration in Alzheimer's disease (AD). The role of superoxide anion (O2*-) in neuronal cell injury induced by reactive oxygen species (ROS) was examined in PC12 cells using pyrogallol (1,2,3-benzenetrior), a donor to release O2*-. Pyrogallol induced PC12 cell death at concentrations, which evidently increased intracellular O2*-, as assessed by O2*- sensitive fluorescent precursor hydroethidine (HEt). A water extract of Curcuma longa L. (Zingiberaceae) (CLE), having O2*- scavenging activity rescued PC12 cells from pyrogallol-induced cell death. Hypoxia/reoxygenation injury of PC12 cells was also blocked by CLE. The present study was also conducted to examine the effect of CLE on H2O2 -induced toxicity in rat pheochromocytoma line PC12 by measuring cell lesion, level of lipid peroxidation and antioxidant enzyme activities. Following a 30 min exposure of the cells to H2O2 (150 microM), a marked decrease in cell survival, activities of glutathione peroxidase and catalase as well as increased production of malondialdehyde (MDA) were found. Pretreatment of the cells with CLE (0.5-10 microg/ml) prior to H2O2 exposure significantly elevated the cell survival, antioxidant enzyme activities and decreased the level of MDA. The above-mentioned neuroprotective effects are also observed with tacrine (THA, 1 microM), suggesting that the neuroprotective effects of cholinesterase inhibitor might partly contribute to the clinical efficacy in AD treatment. Further understanding of the underlying mechanism of the protective effects of these radical scavengers reducing intracellular O2*- on neuronal cell death may lead to development of new therapeutic treatments for hypoxic/ischemic brain injury.
Koo
Byung-Soo
BS
Department of Biochemistry, Molecular Biology and Neurobiology, College of Oriental Medicine, DongGuk University, Kyungju City, Kyungbuk 780-714, Republic of Korea.
Lee
Won-Chang
WC
Chung
Kang-Hyung
KH
Ko
Jeong-Heon
JH
Kim
Cheorl-Ho
CH
D000818:Animals; D061945:Caspase Inhibitors; D002374:Catalase / Q000378:metabolism; D016923:Cell Death / Q000187:drug effects; D015687:Cell Hypoxia; D002470:Cell Survival / Q000187:drug effects; D030024:Curcuma / Q000737:chemistry*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000737:chemistry / Q000494:pharmacology*; D005979:Glutathione Peroxidase / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000037:antagonists & inhibitors* / Q000633:toxicity*; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008315:Malondialdehyde / Q000378:metabolism; D008854:Microscopy, Electron; D018384:Oxidative Stress / Q000187:drug effects; D016716:PC12 Cells; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D011748:Pyrogallol / Q000633:toxicity*; D051381:Rats; D017382:Reactive Oxygen Species / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism; D013619:Tacrine / Q000494:pharmacology
D061945:Caspase Inhibitors; D004791:Enzyme Inhibitors; D016166:Free Radical Scavengers; D010936:Plant Extracts; D017382:Reactive Oxygen Species; D011748:Pyrogallol; D013481:Superoxides; D013619:Tacrine; D008315:Malondialdehyde; D006861:Hydrogen Peroxide; D007770:L-Lactate Dehydrogenase; D002374:Catalase; D005979:Glutathione Peroxidase