Melatonin attenuates mptp-induced neurotoxicity via preventing cdk5-mediated autophagy and SNCA/α-synuclein aggregation

Ling Yan Su, Hao Li, Li Lv, Yue Mei Feng, Guo Dong Li, Rongcan Luo, He Jiang Zhou, Xiao Guang Lei, Liang Ma, Jia Li Li, Lin Xu, Xin Tian Hu, Yong Gang Yao

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

Autophagy is involved in the pathogenesis of neurodegenerative diseases including Parkinson disease (PD). However, little is known about the regulation of autophagy in neurodegenerative process. In this study, we characterized aberrant activation of autophagy induced by neurotoxin 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine (MPTP) and demonstrated that melatonin has a protective effect on neurotoxicity. We found an excessive activation of autophagy in monkey brain tissues and C6 cells, induced by MPTP, which is mediated by CDK5 (cyclin-dependent kinase 5). MPTP treatment significantly reduced total dendritic length and dendritic complexity of cultured primary cortical neurons and melatonin could reverse this effect. Decreased TH (tyrosine hydroxylase)-positive cells and dendrites of dopaminergic neurons in the substantia nigra pars compacta (SNc) were observed in MPTP-treated monkeys and mice. Along with decreased TH protein level, we observed an upregulation of CDK5 and enhanced autophagic activity in the striatum of mice with MPTP injection. These changes could be salvaged by melatonin treatment or knockdown of CDK5. Importantly, melatonin or knockdown of CDK5 reduced MPTP-induced SNCA/ a-synuclein aggregation in mice, which is widely thought to trigger the pathogenesis of PD. Finally, melatonin or knockdown of CDK5 counteracted the PD phenotype in mice induced by MPTP. Our findings uncover a potent role of CDK5-mediated autophagy in the pathogenesis of PD, and suggest that control of autophagic pathways may provide an important clue for exploring potential target for novel therapeutics of PD.

Original languageEnglish (US)
Pages (from-to)1745-1759
Number of pages15
JournalAutophagy
Volume11
Issue number10
DOIs
StatePublished - 2015
Externally publishedYes

Keywords

  • Autophagy
  • CDK5
  • Melatonin
  • MPTP
  • SNCA
  • TH

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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