Disarming FcR-dependent neutrophil activation in MPO-ANCA glomerulonephritis.

Blocking Fc receptor-mediated neutrophil activation with one-armed antibodies reduces renal injury in MPO-ANCA vasculitis models.

• Why it matters: Neutrophil activation via Fc receptors contributes to kidney damage in MPO-ANCA vasculitis, and current treatments lack targeted approaches to prevent this specific pathway.
• What they did: Nishide et al. used spatial profiling to identify activated neutrophils in kidneys and developed one-armed antibodies that block pathogenic anti-MPO autoantibodies, preventing Fc receptor-mediated activation in a passive transfer model.
• The result: This targeted, non-toxic strategy effectively attenuates renal injury, offering a promising approach for disease treatment and flare prevention in MPO-ANCA vasculitis.