Abstract
The spinal cord is highly sensitive to spinal cord injury (SCI) by external mechanical damage, resulting in irreversible neurological damage. Activation of the Wnt/β-catenin signaling pathway can effectively reduce apoptosis and protect against SCI. Melatonin, an indoleamine originally isolated from bovine pineal tissue, exerts neuroprotective effects after SCI through activation of the Wnt/β-catenin signaling pathway. In this study, we demonstrated that melatonin exhibited neuroprotective effects on neuronal apoptosis and supported functional recovery in a rat SCI model by activating the Wnt/β-catenin signaling pathway. We found that melatonin administration after SCI significantly upregulated the expression of low-density lipoprotein receptor related protein 6 phosphorylation (p-LRP-6), lymphoid enhancer factor-1 (LEF-1) and β-catenin protein in the spinal cord. Melatonin enhanced motor neuronal survival in the spinal cord ventral horn and improved the locomotor functions of rats after SCI. Melatonin administration after SCI also reduced the expression levels of Bax and cleaved caspase-3 in the spinal cord and the proportion of terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick end labeling (TUNEL) positive cells, but increased the expression level of Bcl-2. These results suggest that melatonin attenuated SCI by activating the Wnt/β-catenin signaling pathway.
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Abbreviations
- SCI:
-
Spinal cord injury
- p-LRP-6:
-
Low-density lipoprotein receptor related protein 6 phosphorylation
- LEF-1:
-
Lymphoid enhancer factor-1
- CNS:
-
Central nervous system
- MT:
-
Melatonin
- Nrf2:
-
Nuclear factor erythroid 2-related factor 2
- HIF:
-
Hypoxia-inducible factor
- NF-κB:
-
Nuclear factor kappa B
- SOD:
-
Superoxide dismutase
- MDA:
-
Malondialdehyde
- MPO:
-
Myeloperoxidase
- GSH:
-
Glutathione
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- FBS:
-
Fetal bovine serum
- siRNA:
-
Small interference RNA
- BBB:
-
Basso, Beattie, and Bresnahan scores
- TUNEL:
-
Transferase-mediated deoxyuridine triphosphate nick end labeling
- ANOVA:
-
One-way analysis of variance
- SEM:
-
Standard error of the mean
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 81471854, 81671907 and 81601727). The authors thank the other researchers for their valuable technical assistance in this work.
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Shen, Z., Zhou, Z., Gao, S. et al. Melatonin Inhibits Neural Cell Apoptosis and Promotes Locomotor Recovery via Activation of the Wnt/β-Catenin Signaling Pathway After Spinal Cord Injury. Neurochem Res 42, 2336–2343 (2017). https://doi.org/10.1007/s11064-017-2251-7
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DOI: https://doi.org/10.1007/s11064-017-2251-7