Abstract
An initial proteomic analysis of the cuprizone mouse model to characterise the breadth of toxicity by assessing cortex, skeletal muscle, spleen and peripheral blood mononuclear cells. Cuprizone treated vs. control mice for an initial characterisation. Select tissues from each group were pooled, analysed in triplicate using two-dimensional gel electrophoresis (2DE) and deep imaging and altered protein species identified using liquid chromatography tandem mass spectrometry (LC/MS/MS). Forty-three proteins were found to be uniquely detectable or undetectable in the cuprizone treatment group across the tissues analysed. Protein species identified in the cortex may potentially be linked to axonal damage in this model, and those in the spleen and peripheral blood mononuclear cells to the minimal peripheral immune cell infiltration into the central nervous system during cuprizone mediated demyelination. Primary oligodendrocytosis has been observed in type III lesions in multiple sclerosis. However, the underlying mechanisms are poorly understood. Cuprizone treatment results in oligodendrocyte apoptosis and secondary demyelination. This initial analysis identified proteins likely related to axonal damage; these may link primary oligodendrocytosis and secondary axonal damage. Furthermore, this appears to be the first study of the cuprizone model to also identify alterations in the proteomes of skeletal muscle, spleen and peripheral blood mononuclear cells. Notably, protein disulphide isomerase was not detected in the cuprizone cohort; its absence has been linked to reduced major histocompatibility class I assembly and reduced antigen presentation. Overall, the results suggest that, like experimental autoimmune encephalomyelitis, results from the standard cuprizone model should be carefully considered relative to clinical multiple sclerosis.




Abbreviations
- 2DE:
-
Two-dimensional gel electrophoresis
- AD:
-
Alzheimer’s disease
- AFD:
-
Automated frozen disruption
- CC:
-
Corpus callosum
- cCBB:
-
Colloidal Coomassie Brilliant Blue
- EAE:
-
Experimental autoimmune encephalomyelitis
- LC/MS/MS:
-
Liquid chromatography tandem mass spectrometry
- MHC:
-
Major histocompatibility complex
- MP:
-
Membrane protein
- MS:
-
Multiple sclerosis
- OCT:
-
Optimum cutting temperature compound
- PBMCs:
-
Peripheral blood mononuclear cells
- PDI:
-
Protein disulphide isomerase
- RT:
-
Room temperature
- SP:
-
Soluble protein
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Acknowledgments
The authors are grateful to the Rotary Club of Narellan for initiating and funding the Narellan-UWS MS Research Project. MAP acknowledges the UWS Molecular Medicine Research Group and the School of Medicine for PhD scholarship support provided in complement to the funding from Rotary. The authors thank Ashleigh Deschamps and the School of Medicine Animal Facility staff for outstanding assistance, and acknowledge use of the UWS Mass Spectrometry Facility.
Conflict of interest
The authors declare no conflict of interest.
Authors’ contributions
MAP was involved in study design, data acquisition, data analysis and manuscript drafting. SG was involved in manuscript drafting. SJM was involved in study design and manuscript drafting. JRC was involved in study design, data analysis and manuscript drafting. All authors read and approved the final manuscript.
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Partridge, M.A., Gopinath, S., Myers, S.J. et al. An initial top-down proteomic analysis of the standard cuprizone mouse model of multiple sclerosis. J Chem Biol 9, 9–18 (2016). https://doi.org/10.1007/s12154-015-0138-0
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DOI: https://doi.org/10.1007/s12154-015-0138-0