Potentiation of ethanol-induced lipid peroxidation of biological membranes by vitamin C.

Potentiation of ethanol-induced lipid peroxidation of biological membranes by vitamin C.
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维生素 C 增强乙醇诱导的生物膜脂质过氧化。

DOI:
10.1016/0024-3205(88)90476-6
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发表时间:
1988
期刊:
影响因子:
6.1
通讯作者:
Sun,AY
Sun,AY
中科院分区:
医学2区
文献类型:
--
作者:
Ahmad,FF;Cowan,DL;Sun,AY

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利用ADP-Fe ++和H2 O2体系产生的羟自由基(dotOH),用5,5-二甲基-1-吡咯啉-N-氧化物(DMPO)捕获,用电子自旋共振(ESR)谱进行分析。添加维生素C的系统大大减少了DMPO的羟基加合物的形成量。在乙醇存在下,观察到的ESR谱是DMPO的羟基和羟乙基(HE)加合物的复合信号。然而,在维生素C和乙醇的存在下,检测到DMPO的纯HE加合物。我们还检测到乙醇和维生素C存在时脂质过氧化反应的增加。这些数据使我们假设,在生物系统中,这些长寿命的HE自由基的形成可能会导致膜损伤,由于脂质过氧化作用的增加。
The hydroxyl free radical (dotOH) was generated by the system of ADP-Fe++and H2O2, trapped by 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) and analyzed by electron spin resonance (ESR) spectroscopy. The addition of vitamin C to the system decreased considerably the amount of hydroxyl adduct of DMPO formed. In the presence of ethanol, the ESR spectrum observed was a composite signal of the hydroxyl and hydroxyethyl (HE) adducts of DMPO. However, in the presence of vitamin C and ethanol, pure HE adduct of DMPO was detected. We also detected the increase in lipid peroxidation in the presence of ethanol and vitamin C. These data lead us to hypothesize that in the biological system, formation of these long-lived HE free radicals may result in membrane damage due to an increase in lipid peroxidation.
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