Antibody-Mediated Nodo- and Paranodopathies

Area of Science:

• Neurology
• Immunology
• Pathology

Background:

• Pathogenic antibodies targeting cell adhesion molecules at the node of Ranvier are newly discovered.
• This has led to the development of a new classification for specific antibody-mediated peripheral neuropathies, termed autoimmune nodo- and paranodopathies.

Purpose of the Study:

• To review recent findings on nodo- and paranodoneuropathies.
• To highlight the features of these disorders in pediatric patients, an under-explored area.

Main Methods:

• Diagnosis involves transfected cell-based assays and ELISA to identify specific target antigens and antibody subclasses.
• Review of existing literature on adult and pediatric cases.

Main Results:

• These neuropathies involve epitopes like neurofascin 155/186, contactin-1, and CASPR1, with potential for other targets.
• Pediatric cases are rare but often present with atypical chronic inflammatory demyelinating polyneuropathy (CIDP) phenotypes.
• Clinical course is typically rapid, with poor response to standard therapies, and pathological findings suggest axonal damage rather than demyelination.

Conclusions:

• Autoimmune nodo- and paranodopathies represent a distinct subset of peripheral neuropathies.
• Increased awareness and improved diagnostics are crucial for recognizing pediatric cases.
• Understanding the pathophysiology is key to developing targeted treatments.