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Molecular Biology Reports

, Volume 46, Issue 6, pp 6299–6309 | Cite as

Lithium facilitates removal of misfolded proteins and attenuated faulty interaction between mutant SOD1 and p-CREB (Ser133) through enhanced autophagy in mutant hSOD1G93A transfected neuronal cell lines

  • Xiang Yin
  • Shuyu Wang
  • Xudong Wang
  • Yueqing Yang
  • Hongquan Jiang
  • Tianhang Wang
  • Ying Wang
  • Chunting Zhang
  • Honglin FengEmail author
Original Article
  • 107 Downloads

Abstract

Abnormally protein aggregation and deposition are key pathological features of ALS, which may related with dysfunctional cellular autophagy. In the current study, we found that, compared with wtSOD1 cells, serum starvation treatment resulted in significant higher percentage of apoptosis in mutSOD1 cells; Lithium treatment exerted protection for those mutSOD1 cells, with decreased GFP-tagged mutant SOD1 protein aggregates deposition; Whereas, pre-treatment with Baf or 3-MA (autophagy inhibitors) blocked protection of lithium for mutant SOD1 cells, and induced increased GFP-tagged mutant SOD1 protein aggregation. Further, Western blots results showed that lithium treatment led to decrease of mutant hSOD1 protein levels in both Triton X-100 soluble and Triton X-100 insoluble fraction of mutSOD1 cells. Besides, improper binding of mutant SOD1 proteins’ aggregates with p-CREB (Ser133) (transcription factor) in mutSOD1 cells were demonstrated; whereas lithium treatment attenuated this fault interaction. In conclusion, our results showed that, in mutSOD1 cells, mutSOD1 protein aggregates were related with abnormal autophagic regulation. Lithium treatment could induce autophagy and enhance clearance of protein aggregates, further exerting protection on mutSOD1 cells. More importantly, we uncovered another distinct pathological role of mutSOD1 protein aggregates, that is abnormal binding with p-CREB (Ser133), an important transcription factor, which may play crucial role in the PI3K-Akt-CREB-AEG-1 signaling pathway.

Keywords

Amyotrophic lateral sclerosis (ALS) Protein aggregation Autophagy Apoptosis Lithium 

Abbreviations

ALS

Amyotrophic lateral sclerosis

Baf

Bafilomycin

co-IP

co-Immunoprecipitation

CREB

cAMP responsive element-binding protein

EBSS

Earle’s balanced salt solution

GFP

Green fluorescent protein

3-MA

3-Methyladenine

MN

Motor neuron

NSC34 cells

Neuroblastoma × spinal cord cells

SOD1

Superoxide dismutase 1

VDAC1

Voltagedependent anion channel-1

Notes

Acknowledgements

The authors thank Dr. Neil (Cashman of University of British Columbia, Canada) for providing the NSC34 cells. In addition, we wish to thank Shangjin Cui of National Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute (CAAS) for assistance with our work, and Karan of the Editage for excellent editorial assistance.

Author contributions

FHL directed the whole study. FHL, YX and WSY designed the experiments. YX, WSY, WXD, YYQ, WTH and ZCT performed the experiments. JHQ and WY analyzed the data. JHQ and FHL contributed supplying reagents and materials and supported analysis. YX, WSY, WXD, YYQ, JHQ and WTH participated in the discussion. YX and FHL wrote the manuscript.

Funding

This research was funded by Natural Science Foundation of China (Grant Number 81571227).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

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© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of Neurology and Neuroscience CenterThe First Hospital of Jilin UniversityChangchunPeople’s Republic of China
  2. 2.Department of NeurologyThe First Affiliated Hospital of Harbin Medical UniversityHarbinPeople’s Republic of China
  3. 3.Department of NeurologyThe First Affiliated Hospital of Harbin Medical UniversityHarbinPeople’s Republic of China

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