The native copper- and zinc-binding protein metallothionein blocks copper-mediated Abeta aggregation and toxicity in rat cortical neurons.

The native copper- and zinc-binding protein metallothionein blocks copper-mediated Abeta aggregation and toxicity in rat cortical neurons.
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DOI:
10.1371/journal.pone.0012030
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发表时间:
2010-08-11
期刊:
影响因子:
3.7
通讯作者:
West AK
West AK
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chung RS;Howells C;Eaton ED;Shabala L;Zovo K;Palumaa P;Sillard R;Woodhouse A;Bennett WR;Ray S;Vickers JC;West AK

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AD的一个主要病理标志是不溶性细胞外β-淀粉样蛋白(Aβ)斑块的沉积。有令人信服的数据表明,Aβ聚集是通过与金属锌和铜的反应催化的。我们现在报道,主要的人表达金属硫蛋白(MT)亚型MT-2A能够阻止体外铜介导的Aβ1-40和Aβ1-42聚集。MT-2A的这种作用似乎涉及Zn 7 MT-2A和Cu(II)-Aβ之间的金属交换,因为Cu 10 MT-2A或羧甲基化MT-2A都不能阻止Cu(II)-Aβ聚集。此外,Zn 7 MT-2A阻断Cu(II)-Aβ诱导的离子稳态变化和随后的培养皮层神经元的神经毒性。这些结果表明,MT-2A所代表的MT类型能够防止Aβ聚集和毒性。考虑到最近对AD的金属螯合疗法的兴趣,即从Aβ中去除金属,留下不含金属的Aβ,该A β可以容易地再次结合金属,我们认为MT-2A可能代表一种不同的治疗方法,因为MT和Aβ之间的金属交换使Aβ以Zn结合的相对惰性形式存在。
A major pathological hallmark of AD is the deposition of insoluble extracellular β-amyloid (Aβ) plaques. There are compelling data suggesting that Aβ aggregation is catalysed by reaction with the metals zinc and copper. We now report that the major human-expressed metallothionein (MT) subtype, MT-2A, is capable of preventing the in vitro copper-mediated aggregation of Aβ1–40 and Aβ1–42. This action of MT-2A appears to involve a metal-swap between Zn7MT-2A and Cu(II)-Aβ, since neither Cu10MT-2A or carboxymethylated MT-2A blocked Cu(II)-Aβ aggregation. Furthermore, Zn7MT-2A blocked Cu(II)-Aβ induced changes in ionic homeostasis and subsequent neurotoxicity of cultured cortical neurons. These results indicate that MTs of the type represented by MT-2A are capable of protecting against Aβ aggregation and toxicity. Given the recent interest in metal-chelation therapies for AD that remove metal from Aβ leaving a metal-free Aβ that can readily bind metals again, we believe that MT-2A might represent a different therapeutic approach as the metal exchange between MT and Aβ leaves the Aβ in a Zn-bound, relatively inert form.
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