Abstract
Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disorder characterized by the loss of motor neurons in the brain and spinal cord. ALS neuropathology is associated with increased oxidative stress, excitotoxicity, and inflammation. We and others reported that the anti-aging and cognition-enhancing protein Klotho is a neuroprotective, antioxidative, anti-inflammatory, and promyelinating protein. In mice, its absence leads to an extremely shortened life span and to multiple phenotypes resembling human aging, including motor and hippocampal neurodegeneration and cognitive impairment. In contrast, its overexpression extends life span, enhances cognition, and confers resistance against oxidative stress; it also reduces premature mortality and cognitive and behavioral abnormalities in an animal model for Alzheimer’s disease (AD). These pleiotropic beneficial properties of Klotho suggest that Klotho could be a potent therapeutic target for preventing neurodegeneration in ALS. Klotho overexpression in the SOD1 mouse model of ALS resulted in delayed onset and progression of the disease and extended survival that was more prominent in females than in males. Klotho reduced the expression of neuroinflammatory markers and prevented neuronal loss with the more profound effect in the spinal cord than in the motor cortex. The effect of Klotho was accompanied by reduced expression of proinflammatory cytokines and enhanced the expression of antioxidative and promyelinating factors in the motor cortex and spinal cord of Klotho × SOD1 compared to SOD1 mice. Our study provides evidence that increased levels of Klotho alleviate ALS-associated pathology in the SOD1 mouse model and may serve as a basis for developing Klotho-based therapeutic strategies for ALS.
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Abbreviations
- ADAM:
-
A disintegrin and metalloprotease domain
- ALS:
-
Amyotrophic lateral sclerosis
- ALS TDI:
-
ALS Therapy Development Institute
- AD:
-
Alzheimer’s disease
- Axin 2:
-
Axin-related protein 2
- AHCs:
-
Anterior horn cells
- C9ORF72:
-
Chromosome 9 open reading frame 72
- CSF:
-
Cerebrospinal fluid
- CCR2:
-
C-C chemokine receptor type 2
- Cox-2:
-
Cyclooxygenase-2
- FALS:
-
Familial amyotrophic lateral sclerosis
- FGFR:
-
Fibroblast growth factor receptors
- FOXO:
-
Forkhead box O
- Fzd5:
-
Frizzled gene family encoding 7-transmembrane domain proteins
- GFAP:
-
Glial fibrillary acidic protein
- HBSS:
-
Hank’s balanced salt solution
- Iba1:
-
Ionized calcium-binding adaptor molecule 1
- KL-OE:
-
Klotho-overexpressing
- IGF-1:
-
Insulin-like growth factor 1
- IHC:
-
Immunohistochemistry
- IL-1α:
-
Interleukin-1α
- IL-1β:
-
Interleukin-1β
- IL-6:
-
Interleukin-6
- IL-10:
-
Interleukin-10
- IL-12a:
-
Interleukin-12a
- iNOS:
-
Inducible nitric oxide synthase
- MAG:
-
Myelin-associated glycoprotein
- MBP:
-
Myelin basic protein
- MN:
-
Motor neurons
- MS:
-
Multiple sclerosis
- Prx-2:
-
Peroxiredoxin-2
- Prx-3:
-
Peroxiredoxin-3
- PLP1:
-
Proteolipid protein 1
- rmKL:
-
Recombinant mouse Klotho
- NeuN:
-
Neuronal nuclei
- NF-κB:
-
Nuclear factor-κB
- NOS:
-
Nitric oxide synthase
- Nrf2:
-
Nuclear factor erythroid 2-related factor 2
- NS:
-
Neurological score
- SMAD:
-
The activated type I receptors interact with and phosphorylate SMAD (an acronym for the fusion of Caenorhabditis elegans Sma genes and the Drosophila Mad) proteins to transduce signals
- SOD:
-
Superoxide dismutase
- TDP-43:
-
TAR DNA-binding protein 43
- TGF-β:
-
Transforming growth factor-β
- TNF-α:
-
Tumor necrosis factor-α
- TNFAIP2:
-
TNF alpha-induced protein 2
- qRT-PCR:
-
Quantitative reverse transcription polymerase chain reaction
- VEGF:
-
Vascular endothelial growth factor
- Wnt:
-
Wnt is an acronym that stands for “Wingless/Integrated”
- WT:
-
Wild type
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Acknowledgments
The authors wish to thank Dr. Douglas Rosene for his help with statistical analysis.
Funding
This work was supported by NIH grants R01-AG052465 to NCL and R56-AG051638 to CRA.
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EZ, CDC, and CRA conceived the project. EZ, TH, and CRA designed the study. EZ, CDC, EB, BH, JSN, DZ, AGL, and AY performed the experiments in the laboratory of CRA and JDC and RMM in the laboratory of ACM. NCL and QM participated in the RNAseq analyses. All authors contributed to the analyses and/or interpreted the data. EZ wrote the paper with contributions from JSN, TH, and CRA. All authors read and approved the final manuscript.
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Zeldich, E., Chen, CD., Boden, E. et al. Klotho Is Neuroprotective in the Superoxide Dismutase (SOD1G93A) Mouse Model of ALS. J Mol Neurosci 69, 264–285 (2019). https://doi.org/10.1007/s12031-019-01356-2
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DOI: https://doi.org/10.1007/s12031-019-01356-2