Self-Assembly of Aβ1-42 into Globular Neurotoxins

Brett A. Chromy, Richard J. Nowak, Mary P. Lambert, Kirsten L. Viola, Lei Chang, Pauline T. Velasco, Bryan W. Jones, Sara J. Fernandez, Pascale N. Lacor, Peleg Horowitz, Caleb E. Finch, Grant A. Krafft, William L. Klein

Research output: Contribution to journalArticle

437 Citations (Scopus)

Abstract

Amyloid β 1-42 (Aβ1-42) is a self-associating peptide that becomes neurotoxic upon aggregation. Toxicity originally was attributed to the presence of large, readily formed Aβ fibrils, but a variety of other toxic species are now known. The current study shows that Aβ 1-42 can self-assemble into small, stable globular assemblies free of fibrils and protofibrils. Absence of large molecules was verified by atomic force microscopy (AFM) and nondenaturing gel electrophoresis. Denaturing electrophoresis revealed that the globular assemblies comprised oligomers ranging from trimers to 24mers. Oligomers prepared at 4 °C stayed fibril-free for days and remained so when shifted to 37 °C, although the spectrum of sizes shifted toward larger oligomers at the higher temperature. The soluble, globular Aβ1-42 oligomers were toxic to PC12 cells, impairing reduction of MTT and interfering with ERK and Rac signal transduction. Occasionally, oligomers were neither toxic nor recognized by toxicity-neutralizing antibodies, suggesting that oligomers could assume alternative conformations. Tests for oligomerization-blocking activity were carried out by dot-blot immunoassays and showed that neuroprotective extracts of Ginkgo biloba could inhibit oligomer formation at very low doses. The observed neurotoxicity, structure, and stability of synthetic Aβ 1-42 globular assemblies support the hypothesis that Aβ 1-42 oligomers play a role in triggering nerve cell dysfunction and death in Alzheimer's disease.

Original languageEnglish (US)
Pages (from-to)12749-12760
Number of pages12
JournalBiochemistry
Volume42
Issue number44
DOIs
StatePublished - Nov 11 2003
Externally publishedYes

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Poisons
Neurotoxins
Oligomers
Amyloid
Self assembly
Electrophoresis
Ginkgo biloba
Atomic Force Microscopy
PC12 Cells
Neutralizing Antibodies
Immunoassay
Signal Transduction
Alzheimer Disease
Cell Death
Gels
Toxicity
Neurons
Peptides
Temperature
Signal transduction

ASJC Scopus subject areas

  • Biochemistry

Cite this

Chromy, B. A., Nowak, R. J., Lambert, M. P., Viola, K. L., Chang, L., Velasco, P. T., ... Klein, W. L. (2003). Self-Assembly of Aβ1-42 into Globular Neurotoxins. Biochemistry, 42(44), 12749-12760. https://doi.org/10.1021/bi030029q

Self-Assembly of Aβ1-42 into Globular Neurotoxins. / Chromy, Brett A.; Nowak, Richard J.; Lambert, Mary P.; Viola, Kirsten L.; Chang, Lei; Velasco, Pauline T.; Jones, Bryan W.; Fernandez, Sara J.; Lacor, Pascale N.; Horowitz, Peleg; Finch, Caleb E.; Krafft, Grant A.; Klein, William L.

In: Biochemistry, Vol. 42, No. 44, 11.11.2003, p. 12749-12760.

Research output: Contribution to journalArticle

Chromy, BA, Nowak, RJ, Lambert, MP, Viola, KL, Chang, L, Velasco, PT, Jones, BW, Fernandez, SJ, Lacor, PN, Horowitz, P, Finch, CE, Krafft, GA & Klein, WL 2003, 'Self-Assembly of Aβ1-42 into Globular Neurotoxins', Biochemistry, vol. 42, no. 44, pp. 12749-12760. https://doi.org/10.1021/bi030029q
Chromy BA, Nowak RJ, Lambert MP, Viola KL, Chang L, Velasco PT et al. Self-Assembly of Aβ1-42 into Globular Neurotoxins. Biochemistry. 2003 Nov 11;42(44):12749-12760. https://doi.org/10.1021/bi030029q
Chromy, Brett A. ; Nowak, Richard J. ; Lambert, Mary P. ; Viola, Kirsten L. ; Chang, Lei ; Velasco, Pauline T. ; Jones, Bryan W. ; Fernandez, Sara J. ; Lacor, Pascale N. ; Horowitz, Peleg ; Finch, Caleb E. ; Krafft, Grant A. ; Klein, William L. / Self-Assembly of Aβ1-42 into Globular Neurotoxins. In: Biochemistry. 2003 ; Vol. 42, No. 44. pp. 12749-12760.
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