Oxidation of low density lipoprotein and plasma by 15‐lipoxygenase and free radicals

Oxidation of low density lipoprotein and plasma by 15‐lipoxygenase and free radicals
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15-脂氧合酶和自由基对低密度脂蛋白和血浆的氧化

DOI:
10.1016/s0014-5793(99)00137-4
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发表时间:
1999
期刊:
影响因子:
3.5
通讯作者:
H. Kühn
H. Kühn
中科院分区:
生物学3区
文献类型:
--
作者:
H. Yamashita;A. Nakamura;N. Noguchi;E. Niki;H. Kühn

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脂氧合酶(LOX)对多不饱和脂质的戊二烯结构的氧化具有区域特异性和对映体特异性,而自由基介导的脂质过氧化反应则产生立体无规的外消旋产物。证实了兔网织红细胞15-LOX氧化人低密度脂蛋白(LDL),可产生区域、立体和对映体特异性的磷脂酰胆碱(PC)和胆固醇酯(CE)过氧化氢。15-LOX还氧化人血浆,以提供特定的PC和CE氢过氧化物,尽管存在高浓度的抗氧化剂。从LDL中形成的CE氢过氧化物比PC氢过氧化物多,但观察到血浆氧化的相反顺序。在长时间孵育期间,氢过氧化物的S/R比降低,但仍显著大于1,而自由基介导的LDL和血浆氧化产生外消旋产物。
It is generally accepted that the oxidation of pentadiene structures of polyunsaturated lipids by lipoxygenase (LOX) is regio- and enantio-specific, while the free radical-mediated lipid peroxidation gives stereo-random racemic products. It was confirmed that the oxidation of human low density lipoprotein (LDL) by 15-LOX from rabbit reticulocytes gave phosphatidylcholine (PC) and cholesteryl ester (CE) hydroperoxides regio-, stereo- and enantio-specifically. 15-LOX also oxidized human plasma to give specific PC and CE hydroperoxides in spite of the presence of high concentrations of antioxidants. More CE hydroperoxides were formed than PC hydroperoxides from LDL, but the reverse order was observed for plasma oxidation. The S/R ratio of the hydroperoxides decreased during long time incubation but remained significantly larger than one, while free radical-mediated oxidation of LDL and plasma gave racemic products.
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兔网织红细胞脂氧合酶催化花生四烯酰磷脂酰胆碱的特异性 12(S) 和 15(S) 氧化。
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