alpha-Synuclein aggregates interfere with Parkin solubility and distribution: role in the pathogenesis of Parkinson disease

The Journal of Biological Chemistry
Kohichi KawaharaE Masliah

Abstract

Parkinson disease (PD) belongs to a heterogeneous group of neurodegenerative disorders with movement alterations, cognitive impairment, and alpha-synuclein accumulation in cortical and subcortical regions. Jointly, these disorders are denominated Lewy body disease. Mutations in the parkin gene are the most common cause of familial parkinsonism, and a growing number of studies have shown that stress factors associated with sporadic PD promote parkin accumulation in the insoluble fraction. alpha-Synuclein and parkin accumulation and mutations in these genes have been associated with familial PD. To investigate whether alpha-synuclein accumulation might be involved in the pathogenesis of these disorders by interfering with parkin solubility, synuclein-transfected neuronal cells were transduced with lentiviral vectors expressing parkin. Challenging neurons with proteasome inhibitors or amyloid-beta resulted in accumulation of insoluble parkin and, to a lesser extent, alpha-tubulin. Similarly to neurons in the brains of patients with Lewy body disease, in co-transduced cells alpha-synuclein and parkin colocalized and co-immunoprecipitated. These effects resulted in decreased parkin and alpha-tubulin ubiquitination, accumulation of i...Continue Reading

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