Immunoglobulin E plays an immunoregulatory role in lupus

Area of Science:

• Immunology
• Autoimmunity
• Inflammation

Background:

• The role of immunoglobulin E (IgE) in nonallergic inflammatory diseases remains unclear.
• Investigating IgE's impact is crucial for understanding autoimmune pathologies.

Purpose of the Study:

• To explore the effect of IgE deficiency on inflammatory responses in mouse models of lupus-like disease.
• To determine if IgE contributes to autoimmune inflammation severity.

Main Methods:

• Utilized FcγRIIB-deficient mice and mice with FcγRIIB deletion and Yaa translocation.
• Assessed disease development, autoantibody production, organ pathology, and immune cell populations.
• Analyzed basophil activation in both mouse models and human lupus patients.

Main Results:

• IgE deficiency delayed disease onset and reduced severity, marked by lower autoantibody levels and organ damage.
• Reduced plasma cell numbers and decreased IgG2b and IgG3 levels were observed.
• Loss of IgE led to decreased immune cell infiltration (dendritic cells, monocytes, neutrophils, eosinophils) in lymphoid organs and reduced basophil activation.
• Autoreactive IgE in human lupus patients correlated with increased basophil activation and disease activity.

Conclusions:

• IgE deficiency ameliorates autoimmune disease progression and severity.
• IgE plays a significant role in amplifying autoimmune inflammation.
• Targeting IgE may offer therapeutic potential for autoimmune diseases.