Correlation of Visual System Biomarkers With Motor Deficits in Experimental Autoimmune Encephalomyelitis-Optic...

Area of Science:

• Neuroscience
• Ophthalmology
• Immunology

Background:

• Experimental autoimmune encephalomyelitis (EAE) is a key animal model for multiple sclerosis (MS).
• Current EAE scoring methods are subjective and variable, hindering research progress.
• There is a need for objective, clinically relevant outcome measures in EAE studies.

Purpose of the Study:

• To explore visual biomarkers as objective primary outcomes in the EAE model.
• To assess the correlation between visual function/structure and motor impairment in EAE.
• To establish clinically relevant outcome measures for MS research.

Main Methods:

• Mice with EAE were scored for motor impairment.
• Pattern electroretinography (pERG) and optical coherence tomography (OCT) measured retinal function and structure.
• Optic nerve histopathology analyzed demyelination and immune cell infiltration.

Main Results:

• pERG amplitude and RGC/IPL thickness correlated significantly with EAE scores.
• OCT detected RGC/IPL thinning correlating with EAE severity and pERG amplitude.
• Histopathology confirmed correlations between optic nerve damage and visual biomarker measurements.

Conclusions:

• pERG and OCT provide objective, direct assessments of optic nerve involvement in EAE.
• Visual biomarkers reflect both optic nerve pathology and motor deficits in this MS model.
• These visual outcomes can serve as robust primary endpoints for MS therapeutic development.