TY - JOUR
T1 - Zn2+-Aβ40 complexes form metastable quasi-spherical oligomers that are cytotoxic to cultured hippocampal neurons
AU - Solomonov, Inna
AU - Korkotian, Eduard
AU - Born, Benjamin
AU - Feldman, Yishay
AU - Bitler, Arkady
AU - Rahimi, Farid
AU - Li, Huiyuan
AU - Bitan, Gal
AU - Sagi, Irit
PY - 2012/6/8
Y1 - 2012/6/8
N2 - The roles of metal ions in promoting amyloid β-protein (Aβ) oligomerization associated with Alzheimer disease are increasingly recognized. However, the detailed structures dictating toxicity remain elusive for Aβ oligomers stabilized by metal ions. Here, we show that small Zn 2+-bound Aβ1-40 (Zn2+- Aβ40) oligomers formed in cell culture medium exhibit quasispherical structures similar to native amylospheroids isolated recently from Alzheimer disease patients. These quasi-spherical Zn2+-Aβ40 oligomers irreversibly inhibit spontaneous neuronal activity and cause massive cell death in primary hippocampal neurons. Spectroscopic and x-ray diffraction structural analyses indicate that despite their non-fibrillar morphology, the metastable Zn 2+-Aβ40 oligomers are rich in β-sheet and cross-β structures. Thus, Zn2+ promotes Aβ40 neurotoxicity by structural organization mechanisms mediated by coordination chemistry.
AB - The roles of metal ions in promoting amyloid β-protein (Aβ) oligomerization associated with Alzheimer disease are increasingly recognized. However, the detailed structures dictating toxicity remain elusive for Aβ oligomers stabilized by metal ions. Here, we show that small Zn 2+-bound Aβ1-40 (Zn2+- Aβ40) oligomers formed in cell culture medium exhibit quasispherical structures similar to native amylospheroids isolated recently from Alzheimer disease patients. These quasi-spherical Zn2+-Aβ40 oligomers irreversibly inhibit spontaneous neuronal activity and cause massive cell death in primary hippocampal neurons. Spectroscopic and x-ray diffraction structural analyses indicate that despite their non-fibrillar morphology, the metastable Zn 2+-Aβ40 oligomers are rich in β-sheet and cross-β structures. Thus, Zn2+ promotes Aβ40 neurotoxicity by structural organization mechanisms mediated by coordination chemistry.
UR - http://www.scopus.com/inward/record.url?scp=84862005631&partnerID=8YFLogxK
U2 - 10.1074/jbc.M112.344036
DO - 10.1074/jbc.M112.344036
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C2 - 22528492
AN - SCOPUS:84862005631
SN - 0021-9258
VL - 287
SP - 20555
EP - 20564
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 24
ER -