Autoimmune nodopathies: emerging insights and clinical implications.

Purpose of review: Autoimmune nodopathies (AN) are a recognized distinct group of immune-mediated peripheral neuropathies with unique immunopathological features and therapeutic implications. This review synthesizes recent advances in their pathogenesis, diagnosis, and management, which have refined their clinical classification and informed targeted treatment strategies.

Recent findings: AN are characterized by autoantibodies targeting surface proteins in the nodal-paranodal area (anti-contactin-1, anti-contactin-associated protein 1, anti-neurofascin-155, anti-pan-neurofascin), predominantly of IgG4 subclass. Recent studies have delineated antibody subclass contributions to disease mechanisms and identified B-cell response patterns predictive of therapeutic outcomes. Despite clinical overlap with chronic inflammatory demyelinating polyradiculoneuropathy and Guillain-Barré syndrome, AN exhibit a distinct phenotype and a poor response to intravenous immunoglobulins. Multiple studies, including recent ones, report good response and long-term clinical remission with B-cell depleting therapies. Diagnostic assays such as cell-based assays and ELISA offer high accuracy, while biomarker-guided monitoring using antibody titers and serum neurofilament light chain supports individualized follow-up.

Summary: Emerging evidence consolidates AN as a nosologically and therapeutically distinct entity. Integration of immunopathological insights with biomarker-driven strategies enables precision diagnostics and targeted immunotherapy, improving clinical outcomes.