Inhibitory effect of phospholipid hydroperoxide glutathione peroxidase on the activity of lipoxygenases and cyclooxygenases

被引:38
|
作者
Huang, HS
Chen, CJ
Suzuki, H
Yamamoto, S
Chang, WC [1 ]
机构
[1] Natl Cheng Kung Univ, Coll Med, Dept Pharmacol, Tainan 701, Taiwan
[2] Univ Tokushima, Sch Med, Dept Biochem, Tokushima 7708503, Japan
关键词
phospholipid hydroperoxide glutathione peroxidase; lipoxygenase; cyclooxygenase; 12(S)-hydroxyeicosatetraenoic acid;
D O I
10.1016/S0090-6980(99)00017-9
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The partially purified phospholipid hydroperoxide glutathione peroxidase (PHGPx) from A431 cells was used to systematically compare the inhibitory effect on the enzyme activity of various lipoxygenases and cyclooxygenases. Under the standard assay system, platelet 12-lipoxygenase, 15-lipoxygenase, and cyclooxygenase-2 were the most sensitive to the inhibition by PHGPx. 5-Lipoxygenase and cyclooxygenase-l were less sensitive to the inhibition by PHGPx than platelet 12-lipoxygenase and cyclooxygenase-2, respectively, and the difference was approximately 10-fold. Reduction of 12(S)-hydroperoxyeicosatetraenoic acid to 12(S)-hydroxyeicosatetraenoic acid by PHGPx was observed in the presence of glutathione (GSH), and the inhibitory effect of PHGPx on 12-lipoxygenase-catalyzed arachidonate metabolism was reversed by the addition of exogenous lipid hydroperoxide, The results indicate that PHGPx directly reduced Lipid hydroperoxides and then down-regulated the activity of arachidonate oxygenases. Moreover, a high-level expression of PHGPx mRNA and its 12-lipoxygenase-inhibitory activity was observed in cancer cells and endothelial cells, and these results suggest that PHGPx may play a significant role in the regulation of reactive oxygen species formation in these cells, (C) 1999 Published by Elsevier Science Inc. All rights reserved.
引用
收藏
页码:65 / 75
页数:11
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