miR-132-5p regulates apoptosis and autophagy in MPTP model of Parkinson's disease by targeting ULK1

Neuroreport. 2020 Sep 9;31(13):959-965. doi: 10.1097/WNR.0000000000001494.

Abstract

Parkinson's disease (PD) is a neurodegenerative disorder that is characterized by a loss of dopaminergic neurons in the substantia nigra of the brain. Numerous investigations have focused on the underlying mechanism involved in the progression of PD in recent decades. miR-132 is abnormal expression in many diseases including PD. However, the functional role and molecular mechanism of miR-132-5p in PD pathogenesis are still not elucidated. In our study, we found miR-132-5p was upregulated in 1-methyl-4-pheny-1,2,3,6-tetrahydropyridine (MPTP) model of PD. MTT assay and flow cytometric analysis revealed that inhibition of miR-132-5p increased cell survival ability and reduced MPTP-induced apoptosis of SH-SY5Y cells. Furthermore, inhibition of miR-132-5p could significantly suppressed mRNA and protein expression levels of LC3 and Beclin 1, indicating inhibition of miR-132-5p might restrain autophagy in PD. Subsequently, ULK1 was identified as a target of miR-132-5p and positively regulated by miR-132-5p at both mRNA and protein levels. Additionally, ectopic expression of ULK1 was able to reverse the effects of miR-132-5p inhibition. Taken together, our results demonstrated that miR-132-5p inhibition might exert a protective role in MPTP-treated PD models by targeting ULK1, indicating that miR-132-5p may be a prospective therapeutic target for PD.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine
  • Animals
  • Antagomirs / pharmacology
  • Apoptosis / genetics*
  • Autophagy / genetics*
  • Autophagy-Related Protein-1 Homolog / genetics*
  • Autophagy-Related Protein-1 Homolog / metabolism
  • Cell Line, Tumor
  • Cell Survival / genetics
  • Flow Cytometry
  • Humans
  • Mice
  • MicroRNAs / antagonists & inhibitors
  • MicroRNAs / genetics*
  • Neurotoxins
  • Parkinsonian Disorders / genetics*
  • RNA, Messenger / metabolism

Substances

  • Antagomirs
  • MIRN132 microRNA, human
  • MIRN132 microRNA, mouse
  • MicroRNAs
  • Neurotoxins
  • RNA, Messenger
  • 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine
  • Autophagy-Related Protein-1 Homolog