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Targeted suppression of chaperone-mediated autophagy by miR-320a promotes α-synuclein aggregation

Guobin Li1, Haiying Yang2, Dezhang Zhu3

  • 1Department of Neurosurgery, the Affiliated Hospital of Qingdao University, Qingdao 266003, Shandong, China. guobinli434@163.com.

International Journal of Molecular Sciences
|September 11, 2014
PubMed

Insights

MicroRNA-320a targets Hsc 70, reducing its expression and impairing alpha-synuclein degradation. This accumulation suggests miR-320a

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Chaperone-mediated autophagy (CMA) degrades wild-type alpha-synuclein, a key process in Parkinson's disease (PD).
  • MicroRNAs (miRNAs) are known to regulate components of CMA, including LAMP2A and Heat shock cognate protein 70 (Hsc 70).
  • Dysregulation of these components is implicated in PD pathogenesis.

Purpose of the Study:

  • To investigate the regulatory role of miR-320a in chaperone-mediated autophagy (CMA).
  • To determine the effect of miR-320a on alpha-synuclein degradation.
  • To examine the specific targeting of Hsc 70 by miR-320a.

Main Methods:

  • Constructed a human neuroblastoma cell line (SH-SY5Y-Syn(+)) overexpressing wild-type alpha-synuclein.
  • Transfected SH-SY5Y-Syn(+) cells with miR-320a mimics.
  • Assessed the expression levels of Hsc 70 and LAMP2A at both mRNA and protein levels.
  • Evaluated the impact of miR-320a on alpha-synuclein degradation and accumulation.

Main Results:

  • miR-320a specifically targeted the 3' untranslated region (UTR) of Hsc 70 mRNA.
  • Transfection with miR-320a mimics significantly reduced Hsc 70 expression at both mRNA and protein levels.
  • LAMP2A expression remained unaffected by miR-320a.
  • Reduced Hsc 70 levels attenuated alpha-synuclein degradation, leading to significant intracellular alpha-synuclein accumulation.

Conclusions:

  • miR-320a directly targets and downregulates Hsc 70 expression in an alpha-synuclein overexpressing cellular model.
  • The decrease in Hsc 70 mediated by miR-320a impairs the degradation of alpha-synuclein.
  • These findings suggest that miR-320a may contribute to the exacerbation of alpha-synuclein pathology in Parkinson's disease.

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