T-cell and autoantibody profiling for primary immune regulatory disorders

Area of Science:

• Immunology
• Autoimmunity
• Diagnostic Biomarkers

Background:

• Primary immune regulatory disorders (PIRD) lack sufficient clinical diagnostic tools.
• Elevated circulating T follicular helper (cTfh) cells are associated with some autoimmune diseases.

Purpose of the Study:

• To develop a diagnostic strategy combining cellular and serologic autoimmunity markers.
• To improve the characterization of primary immune regulatory disorders.

Main Methods:

• Flow cytometry was used to analyze CD4+ T cells (CXCR5+, CXCR3+, CCR6+).
• Autoantibodies (IgG, IgA) were quantified using a protein microarray.
• Defined thresholds for increased cell percentages and autoantibody levels based on controls.

Main Results:

• Increased CD4+CXCR5+PD1+ cTfh cells were found in 27.7% of patients.
• 42.5% of patients showed increased CD4+CXCR5+ T cells expressing CXCR3 and/or CCR6.
• An integrated approach demonstrated 71.4% sensitivity and 85.0% specificity for PIRD detection.

Conclusions:

• Integrating CD4+ T-cell phenotyping with autoantibody burden enhances autoimmunity detection in PIRD.
• This combined approach offers a more robust diagnostic strategy for immune regulatory disorders.