Overexpression of aα-synuclein in oligodendrocytes does not increase susceptibility to focal striatal excitotoxicity

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© 2015 Kuzdas-Wood et al.Background: Multiple system atrophy (MSA) is a fatal adult-onset neurodegenerative disease characterized by aα-synuclein (aα-syn) positive oligodendroglial cytoplasmic inclusions. The latter are associated with a neuronal multisystem neurodegeneration targeting central autonomic, olivopontocerebellar and striatonigral pathways, however the underlying mechanisms of neuronal cell death are poorly understood. Previous experiments have shown that oligodendroglial aα-syn pathology increases the susceptibility to mitochondrial stress and proteasomal dysfunction leading to enhanced MSA-like neurodegeneration. Here we analyzed whether oligodendroglial aα-syn overexpression in a transgenic mouse model of MSA synergistically interacts with focal neuronal excitotoxic damage generated by a striatal injection of quinolinic acid (QA) to affect the degree of striatal neuronal loss. Results: QA injury led to comparable striatal neuronal loss and optical density of astro- and microgliosis in the striatum of transgenic and control mice. Respectively, no differences were identified in drug-induced rotation behavior or open field behavior between the groups. Conclusions: The failure of oligodendroglial aα-syn pathology to exacerbate striatal neuronal loss resulting from QA excitotoxicity contrasts with enhanced striatal neurodegeneration due to oxidative or proteolytic stress, suggesting that enhanced vulnerability to excitotoxicity does not occur in oligodendroglial aα-synucleinopathy like MSA.




Kuzdas-Wood, D., Fellner, L., Premstaller, M., Borm, C., Bloem, B., Kirik, D., … Stefanova, N. (2015). Overexpression of aα-synuclein in oligodendrocytes does not increase susceptibility to focal striatal excitotoxicity. BMC Neuroscience, 16(1). https://doi.org/10.1186/s12868-015-0227-6

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