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MicroRNA-137-3p Protects PC12 Cells Against Oxidative Stress by Downregulation of Calpain-2 and nNOS

Abstract

The imbalance between excess reactive oxygen species (ROS) generation and insufficient antioxidant defenses contribute to a range of neurodegenerative diseases. High ROS levels damage cellular macromolecules such as DNA, proteins and lipids, leading to neuron vulnerability and eventual death. However, the underlying molecular mechanism of the ROS regulation is not fully elucidated. Recently, an increasing number of studies suggest that microRNAs (miRNAs) emerge as the targets in regulating oxidative stress. We recently reported the neuroprotective effect of miR-137-3p for brachial plexus avulsion-induced motoneuron death. The present study is sought to investigate whether miR-137-3p also could protect PC12 cells against hydrogen peroxide (H2O2) induced neurotoxicity. By using cell viability assay, ROS assay, gene and protein expression assay, we found that PC-12 cells exposed to H2O2 exhibited decreased cell viability, increased expression levels of calpain-2 and neuronal nitric oxide synthase (nNOS), whereas a decreased miR-137-3p expression. Importantly, restoring the miR-137-3p levels in H2O2 exposure robustly inhibited the elevated nNOS, calpain-2 and ROS expression levels, which subsequently improved the cell viability. Furthermore, the suppressive effect of miR-137-3p on the elevated ROS level under oxidative stress was considerably blunted when we mutated the binding site of calpain-2 targted by miR-137-3p, suggesting the critical role of calpain-2 involving the neuroprotective effect of miR-137-3p. Collectively, these findings highlight the neuroprotective role of miR-137-3p through down-regulating calpain and NOS activity, suggesting its potential role for combating oxidative stress insults in the neurodegenerative diseases.

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Funding

This work was supported by research grants from the National Natural Science Foundation of China (81771325) and Sun Yat-sen University Research Startup Foundation (59000-18841219).

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YT and RF performed the experiment, wrote the manuscript, acquired the data, and created the figures. YQL,GYY,ZML,KZ, PLMZ, and WFL performed experiments and data analysis. RF and LHZ designed the study and revised the manuscript for important intellectual content. All authors read and approved the final manuscript.

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Correspondence to Rao Fu or Li-Hua Zhou.

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The authors declare that they have no conflict of interest.

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Tang, Y., Li, Y., Yu, G. et al. MicroRNA-137-3p Protects PC12 Cells Against Oxidative Stress by Downregulation of Calpain-2 and nNOS. Cell Mol Neurobiol 41, 1373–1387 (2021). https://doi.org/10.1007/s10571-020-00908-0

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  • DOI: https://doi.org/10.1007/s10571-020-00908-0

Keywords

  • miR-137-3p
  • Calpain-2
  • Neuronal nitric oxide synthase
  • Oxidative stress
  • Reactive oxygen species