Abstract
Misfolding and subsequent self-assembly of proteins into various aggregates is a common molecular mechanism in a number of important human diseases. Understanding the peculiarities of the protein-misfolding processes is essential for the design of successful drugs that inhibit or reverse protein aggregation, leading to protein-misfolding pathologies. Protein aggregation is a complex process characterized by remarkable polymorphism, where soluble amyloid oligomers, amyloid fibrils, and amorphous aggregates are found as the final products. This polymorphism is associated with existence of multiple, independent, and competing assembly pathways leading to aggregation. Irrespectively of aggregation mechanisms, soluble oligomers inevitably form during the self-association processes. Some of these oligomers are now considered major initiators of the pathogenic neurodegenerative cascades in the corresponding diseases. However, not all oligomers are equally harmful, and several amyloidogenic proteins form non-toxic oligomers, some of which are efficient fibrillation inhibitors. Unfortunately, information on the structural properties of soluble oligomers and mechanisms of their formation, inter-conversion, and toxicity is sparse. This chapter provides an overview of some topics related to soluble oligomers and several illustrative examples of toxic, non-toxic, productive, and off-pathway amyloid oligomers. The peculiarities of soluble oligomers of α-synuclein and its relation to the pathogenesis of Parkinson’s disease are also discussed.
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- AD:
-
Alzheimer disease
- ADDL:
-
Aβ-derived diffusible ligand
- AFM:
-
Atomic-force microscopy
- AL amyloidosis:
-
Light-chain-associated amyloidosis
- ANS:
-
8-anilinonaphthalenesulfonic acid
- APP:
-
β-amyloid precursor protein
- CD:
-
Circular dichroism
- CJD:
-
Creutzfeldt–Jakob disease
- DLB:
-
Dementia with Lewy bodies
- DLBD:
-
Diffuse Lewy-body disease
- EM:
-
Electron microscopy
- FFI:
-
Fatal familial insomnia
- FTIR:
-
Fourier-transform infrared spectroscopy
- GSS:
-
Gerstmann–Sträussler–Scheinker syndrome
- HD:
-
Huntington disease
- LCDD:
-
Light-chain-deposition disease
- LBVAD:
-
Lewy-body variant of Alzheimer’s disease
- LTP:
-
Long-term potentiation
- MSA:
-
Multiple-system atrophy
- MW:
-
Molecular weight
- NFT:
-
Neurofibrillary tangle
- NIID:
-
Neuronal intranuclear inclusion disease
- PD:
-
Parkinson’s disease
- PHF:
-
Paired helical filaments
- PrPC :
-
Cellular form of the prion protein
- PrPSc :
-
Scrapie form of the prion protein
- SBMA:
-
Spinal and bulbar muscular atrophy
- SCA:
-
Spinocerebellar ataxia
- ThT:
-
Thioflavin T
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Acknowledgements
This work was supported in part by the Program of the Russian Academy of Sciences for the “Molecular and cellular biology” (V.N.U.), by grants R01 LM007688-01A1 (V.N.U.) and GM071714-01A2 (V.N.U.) from the National Institutes of Health and the grant EF 0849803 (V.N.U.) from the National Science Foundation. We gratefully acknowledge support of the IUPUI Signature Centers Initiative.
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Hong, DP., Zhou, W., Santner, A., Uversky, V.N. (2012). Oligomers of α-Synuclein in the Pathogenesis of Parkinson’s Disease. In: Rahimi, F., Bitan, G. (eds) Non-fibrillar Amyloidogenic Protein Assemblies - Common Cytotoxins Underlying Degenerative Diseases. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-2774-8_6
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