Journal
JOURNAL OF NEUROPATHOLOGY AND EXPERIMENTAL NEUROLOGY
Volume 70, Issue 8, Pages 686-697Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/NEN.0b013e3182269ecd
Keywords
alpha-Synuclein; Adeno-associated virus; MPTP; Neuroprotection; Osmotic minipump; Parkin; Parkinson disease
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Funding
- National Institute of Biomedical Innovation
- Research Committee of CNS Degenerative Diseases, the Ministry of Health, Labour and Welfare of Japan
- Ministry of Health, Labour and Welfare of Japan
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [S0801035]
- Grants-in-Aid for Scientific Research [20220006] Funding Source: KAKEN
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Loss-of-function mutations in the ubiquitin ligase parkin are the major cause of recessively inherited early-onset Parkinson disease (PD). Impairment of parkin activity caused by nitrosative or dopamine-related modifications may also be responsible for the loss of dopaminergic (DA) neurons in sporadic PD. Previous studies have shown that viral vector-mediated delivery of parkin prevented DA neurodegeneration in several animal models, but little is known about the neuroprotective actions of parkin in vivo. Here, we investigated mechanisms of neuroprotection of overexpressed parkin in a modified long-term mouse model of PD using osmotic minipump administration of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). Recombinant adeno-associated viral vector-mediated intranigral delivery of parkin prevented motor deficits and DA cell loss in the mice. Ser129-phosphorylated alpha-synuclein-immunoreactive cells were increased in the substantia nigra of parkin-treated mice. Moreover, delivery of parkin alleviated the MPTP-induced decrease of the active phosphorylated form of Akt. On the other hand, upregulation of p53 and mitochondrial alterations induced by chronic MPTP administration were barely suppressed by parkin. These results suggest that the neuroprotective actions of parkin may be impaired in severe PD.
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