作者
Math P Cuajungco, Lee E Goldstein, Akihiko Nunomura, Mark A Smith, James T Lim, Craig S Atwood, Xudong Huang, Yasser W Farrag, George Perry, Ashley I Bush
发表日期
2000/6/30
期刊
Journal of Biological Chemistry
卷号
275
期号
26
页码范围
19439-19442
出版商
Elsevier
简介
Aβ binds Zn2+, Cu2+, and Fe3+ in vitro, and these metals are markedly elevated in the neocortex and especially enriched in amyloid plaque deposits of individuals with Alzheimer's disease (AD). Zn2+ precipitates Aβ in vitro, and Cu2+ interaction with Aβ promotes its neurotoxicity, correlating with metal reduction and the cell-free generation of H2O2 (Aβ1–42 > Aβ1–40 > ratAβ1–40). Because Zn2+ is redox-inert, we studied the possibility that it may play an inhibitory role in H2O2-mediated Aβ toxicity. In competition to the cytotoxic potentiation caused by coincubation with Cu2+, Zn2+ rescued primary cortical and human embryonic kidney 293 cells that were exposed to Aβ1–42, correlating with the effect of Zn2+ in suppressing Cu2+-dependent H2O2formation from Aβ1–42. Since plaques contain exceptionally high concentrations of Zn2+, we examined the relationship between oxidation (8-OH guanosine) levels in …
引用总数
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MP Cuajungco, LE Goldstein, A Nunomura, MA Smith… - Journal of Biological Chemistry, 2000