Mgat5 deficiency in T cells and experimental autoimmune encephalomyelitis

Area of Science:

• Neuroimmunology
• Glycobiology
• Autoimmune Diseases

Background:

• Multiple sclerosis (MS) is an inflammatory, demyelinating, and neurodegenerative disease driven by autoreactive T cells.
• The Mgat5 gene, involved in N-linked protein glycosylation, correlates with MS severity and modulates experimental autoimmune encephalomyelitis (EAE) in mice.
• Mgat5-mediated N-glycan branching regulates cell surface glycoprotein interactions and T-cell functions.

Purpose of the Study:

• To investigate if Mgat5 deficiency specifically in myelin-reactive T cells is sufficient to induce demyelinating disease.
• To determine the contribution of Mgat5 branching in both T cells and non-T cells to MS pathogenesis.

Main Methods:

• Adoptive transfer of myelin-reactive Mgat5 knockout (Mgat5(-/-)) T cells.
• Comparison of experimental autoimmune encephalomyelitis (EAE) severity in wild-type (Mgat5(+/+)) versus Mgat5 knockout (Mgat5(-/-)) recipient mice.

Main Results:

• Adoptive transfer of Mgat5(-/-) T cells into Mgat5(-/-) recipients resulted in more severe EAE compared to transfer into Mgat5(+/+) recipients.
• This suggests a crucial role for Mgat5 branching in recipient cells (T cells and/or non-T cells) in disease regulation.

Conclusions:

• Mgat5 deficiency in myelin-reactive T cells alone may not be the sole driver of demyelinating disease.
• Mgat5 branching in recipient naive T cells and/or non-T cells significantly contributes to the pathogenesis of experimental autoimmune encephalomyelitis (EAE).