Longevity & AgingIgM Sugar Coating Drives Nerve Damage in Anti-MAG Neuropathy
Researchers discovered that IgM antibodies in anti-MAG neuropathy carry a distinctive sugar (N-glycan) signature—dominated by a fucosylated, monosialylated structure—that amplifies their ability to bind myelin protein MAG, activate complement (C1q), and trigger macrophages to release inflammatory cytokines including IL-8, IL-6, TNF-α, and IFN-γ. Removing these sugar chains chemically reduced both MAG binding and complement activation by roughly 40–58%, confirming the glycans are mechanistically important rather than incidental. These findings reframe anti-MAG neuropathy as a glycosylation-dependent autoimmune disease and point toward IL-8 inhibition and complement blockade as therapeutic strategies.
