Abstract:
Accumulation of α-synuclein (α-syn) resulting in the formation of oligomers and protofibrils has been linked to the neurodegenerative process in Parkinson’s disease and Lewy body dementia. Genetic and environmental factors affecting the rate of α-syn production, aggregation, and clearance might play an important role. Therefore, development of new therapies will require either reducing α-syn synthesis and rate of aggregation, or enhancing clearance. Clearance of α-syn aggregates depends on lysosomal and nonlysosomal pathways. Among the various approaches to promote clearance of α-syn aggregates, immunotherapy is of special interest because antibodies can specifically target abnormal α-syn aggregates. Experimental studies have shown that active as well as passive immunization might reduce α-syn accumulation and associated deficits. Similarly, strategies employing anti-α-syn intrabodies, where cells are genetically modified to produce anti-α-syn antibodies, rescue the phenotype associated with α-syn aggregates. In addition, cellular immunotherapy with copolymer has been shown to reduce neurodegeneration in acute models such as 1-methyl 4-phenyl 1,2,3,6-tetrahydropyridine (MPTP) toxicity. The mechanisms through which antibodies against α-syn aggregates might ameliorate the deficits in mice and cellular models are under investigation. Antibodies might act by recognizing α-syn oligomers accumulating in the neuronal membranes and promote degradation of α-syn aggregates via endosomal–lysosomal pathways and autophagy. Therapeutic approaches focusing on the combination of antibodies and regulation of cellular immune responses might prove in the future to be effective.
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Abbreviations
- CMA:
-
chaperone-mediated autophagy
- DLB:
-
dementia with LBs
- LBD:
-
Lewy body disease
- LRRK2:
-
leucine-rich repeat kinase-2
- MPTP:
-
1-methyl 4-phenyl 1,2,3,6-tetrahydropyridine
- MSA:
-
multiple systems atrophy
- PDD:
-
PD dementia
- PDGF-β:
-
platelet-derived growth factor-β
- PINK1:
-
PTEN-induced putative kinase-1
- PrP:
-
prion protein
- UCH-L1:
-
ubiquitin carboxyl-terminal esterase-L1
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Acknowledgments
This work was supported by NIH Grants AG18440, AG022074, and AG10435.
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Crews, L., Spencer, B., Masliah, E. (2009). Immunotherapy Strategies for Lewy Body and Parkinson's Diseases. In: Lajtha, A., Banik, N., Ray, S.K. (eds) Handbook of Neurochemistry and Molecular Neurobiology. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-30375-8_26
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