首页> 外文期刊>Brain research. Molecular brain research >3,4-Dihydroxyphenylacetaldehyde and hydrogen peroxide generate a hydroxyl radical: possible role in Parkinson's disease pathogenesis.
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3,4-Dihydroxyphenylacetaldehyde and hydrogen peroxide generate a hydroxyl radical: possible role in Parkinson's disease pathogenesis.

机译:3,4-二羟基苯基乙醛和过氧化氢产生一个羟基自由基:可能在帕金森氏病的发病机理中起作用。

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摘要

3,4-Dihydroxyphenylacetaldehyde (DOPAL) and 3,4-dihydroxyphenylglycolaldehyde (DOPEGAL), the monoamine oxidase (MAO) metabolites of dopamine (DA) and norepinephrine (NE), respectively, are toxic to catecholamine (CA) neurons in vitro and in vivo. DOPEGAL generates a free radical and activates mitochondrial permeability transition, a mechanism implicated in neuron death. To determine if DOPAL and other DA metabolites generate the hydroxyl radical in the presence of H(2)O(2), we used HPLC-EC to detect salicylate hydroxylation products. To determine the relative reducing capacity of DOPAL and DOPEGAL we used cyclic voltammetry to measure their reduction potentials. Results indicate that DOPAL, but not DOPEGAL, DA or other DA metabolites, generates hydroxyl radicals. Atomic absorption spectroscopy and heavy metal screening indicate that this result is not due to contamination of DOPAL with iron or other heavy metals. DOPAL reduction potential (161 mV) is lower than that of DOPEGAL (235 mV). DOPAL is present in human substantia nigra. The implications of these findings to CA neuronal death in degenerative brain diseases are discussed.
机译:多巴胺(DA)和去甲肾上腺素(NE)的单胺氧化酶(MAO)代谢产物3,4-二羟基苯基乙醛(DOPAL)和3,4-二羟基苯基乙醛(DOPEGAL)在体外和体内对儿茶酚胺(CA)神经元均具有毒性体内。 DOPEGAL产生自由基并激活线粒体通透性转变,这是神经元死亡的一种机制。要确定DOPAL和其他DA代谢物是否在H(2)O(2)存在下产生羟基自由基,我们使用HPLC-EC检测水杨酸酯的羟基化产物。为了确定DOPAL和DOPEGAL的相对还原能力,我们使用循环伏安法测量其还原电位。结果表明,DOPAL而不是DOPEGAL,DA或其他DA代谢物会产生羟基自由基。原子吸收光谱法和重金属筛选表明,该结果不是由于DOPAL被铁或其他重金属污染所致。 DOPAL还原电位(161 mV)低于DOPEGAL(235 mV)。 DOPAL存在于人类黑质中。讨论了这些发现对退行性脑疾病中CA神经元死亡的影响。

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