Enhanced visualization of axonopathy in EAE using thy1-YFP transgenic mice

Area of Science:

• Neuroscience
• Immunology
• Pathology

Background:

• Chronic disabilities in multiple sclerosis (MS) are linked to neuronal damage.
• Understanding axonal disruption is crucial for developing MS therapies.

Purpose of the Study:

• To characterize axonal damage in the spinal cord of mice with MOG-induced experimental autoimmune encephalomyelitis (MOG-EAE), an MS model.
• To investigate the utility of YFP reporter mice and specific antibodies for visualizing axonal pathology.

Main Methods:

• Induced MOG-EAE in thy1-YFP transgenic mice.
• Utilized YFP fluorescence to track motorneurons and SMI 32 antibody for hypophosphorylated neurofilament-H (hypoP-NF-H).
• Employed CD11b antibody to identify inflammatory cells and assess their interaction with axons.

Main Results:

• Observed fragmented axons and axonal spheroids in MOG-EAE mice.
• Found that YFP and hypoP-NF-H markers visualized distinct populations of damaged axons, providing a more comprehensive assessment.
• Detected early inflammatory cell attack on white matter axons using YFP and CD11b.
• Showed accumulation of hyperphosphorylated neurofilament-H (hyperP-NF-H) in lesioned areas and neuronal perikarya.

Conclusions:

• Combining YFP fluorescence and hypoP-NF-H immunoreactivity offers a more complete picture of axonopathy in the MOG-EAE spinal cord.
• This approach aids in identifying early inflammatory processes targeting axons in MS models.
• The findings contribute to understanding neurodegeneration mechanisms in MS.