Protective Effects of (E)-2-(1-Hydroxyl-4-Oxocyclohexyl) Ethyl Caffeine Against Hydrogen Peroxide-Induced Injury in PC12 Cells

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• 作者：Bingyang Chen ; Rongcai Yue ; Yongge Yang ; Huawu Zeng ; Wanlin Chang…
• 关键词：Caffeic ester ; Oxidative stress ; PC12 cells ; Neuroprotection ; (E) ; 2 ; (1 ; hydroxyl ; 4 ; oxocyclohexyl) ethyl caffeine
• 刊名：Neurochemical Research
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：40
• 期：3
• 页码：531-541
• 全文大小：4,173 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine
  Neurosciences
  Biochemistry
  Neurology
  
• 出版者：Springer Netherlands
• ISSN：1573-6903

文摘

(E)-2-(1-hydroxyl-4-oxocyclohexyl) ethyl caffeine (HOEC), a naturally caffeic ester isolated from Incarvillea mairei, has been reported to possess anti-inflammatory activity by targeting 5-lipoxygenase. However, its other potential activities have yet to be explored. In this study, we measured antioxidant activity of HOEC using the DPPH free radical-scavenging assay. Then, we exposed rat pheochromocytoma (PC12) cells to hydrogen peroxide (H2O2)-induced damage and investigated the antioxidant activity of HOEC. Cell viability, lactate dehydrogenase (LDH) release, cellular morphology, Hoechst 33342 fluorescent staining, and apoptosis of the PC12 cells were assessed after treatment with 0.3-0?μM HOEC for 2?h and exposure to 600?μM H2O2. Additionally, glutathione reductase (GR), superoxide dismutase (SOD), lipid peroxidation malondialdehyde (MDA), and intracellular reactive oxygen species (ROS) accumulation were assayed after the PC12 cells were exposed to H2O2. To investigate mechanism, apoptosis-related protein were evaluated, including cleaved caspase 3/7, cleaved PARP, Bcl-2, Bcl-XL, and cytochrome c. The results showed that HOEC possessed potent antioxidant activity and pre-treatment with HOEC prior to H2O2 exposure significantly increased cell viability, reduced the release of LDH, ameliorated changes in cell morphology, and inhibited apoptosis. Further, HOEC did the following: reduced intracellular accumulation of ROS and MDA; rescued loss of SOD and GR activities; inhibited activated caspase-3 and caspase-7, cleaved PARP, and cytochrome c release; up-regulated the antiapoptosis-related protein Bcl-2 and Bcl-XL; and down-regulated the apoptosis-related proteins Bax and Bad. These findings suggested that HOEC may be a therapeutic agent for treating oxidative stress-derived neurodegenerative disorders.