B cells in multiple sclerosis.

Area of Science:

• Neuroimmunology
• Immunology
• Pathogenesis of Multiple Sclerosis

Background:

• B cells are increasingly recognized for their significant role in the pathogenesis of multiple sclerosis (MS).
• While B cell-depleting therapies demonstrate their involvement, the precise mechanisms are not fully elucidated.
• MS is an autoimmune condition where both T and B lymphocytes are critical players.

Purpose of the Study:

• To review current knowledge on the multifaceted roles of B cells in multiple sclerosis (MS).
• To consider the heterogeneity of MS in understanding B cell contributions.
• To inform therapeutic strategies by clarifying B cell functions in different patient subgroups.

Main Methods:

• Literature review of current research on B cells in multiple sclerosis.
• Analysis of evidence from B cell-depleting therapies.
• Synthesis of findings regarding B cell functions including antigen presentation, cytokine secretion, and antibody production.

Main Results:

• B cells contribute to MS pathogenesis through antigen presentation to T cells and cytokine secretion (pro- or anti-inflammatory).
• While pathogenic antibodies are implicated in some MS patients, B cells' role extends beyond antibody production.
• Plasma cells and antibody levels often remain unchanged after B cell depletion, suggesting alternative pathogenic mechanisms.

Conclusions:

• B cells engage in diverse pathogenic mechanisms in MS, including antigen presentation and cytokine modulation.
• Understanding the varied functions of B cells across MS patients is essential for personalized therapy selection.
• Further research into B cell heterogeneity in MS will refine the efficacy of B cell-directed treatments.