Protein microarrays identify disease-specific anti-cytokine autoantibody profiles in the landscape of immunodeficiency

• Published in: Journal of allergy and clinical immunology Vol. 137; no. 1; pp. 204 - 213.e3
• Main Authors: Rosenberg, Jacob M., ScB, Price, Jordan V., PhD, Barcenas-Morales, Gabriela, PhD, Ceron-Gutierrez, Lourdes, BSc, MSc, Davies, Sophie, BSc, Kumararatne, Dinakantha S., MBBS, FRCpath, DPhil, Döffinger, Rainer, PhD, FRCPath, Utz, Paul J., MD
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01-01-2016; Elsevier Limited
• Subjects: Allergy and Immunology; Anti-cytokine autoantibodies; Autoantibodies - blood; Autoimmune diseases; autoimmune polyendocrine syndrome type I; Cytokines; Cytokines - immunology; Disease; Experiments; Homeostasis; Humans; immunodeficiency; Immunoglobulins; Immunologic Deficiency Syndromes - blood; Immunologic Deficiency Syndromes - immunology; Infections; Laboratories; Manufacturers; Protein Array Analysis; protein microarray; Proteins; pulmonary alveolar proteinosis; Studies; thymoma; autoimmune polyendocrine syndrome type I; Macrophage inflammatory protein 1α; AIRE; Anti-cytokine autoantibodies; protein microarray; Mean fluorescence intensity; Anti-cytokine autoantibody; PBS plus Tween; Autoimmune regulator; pulmonary alveolar proteinosis; APS-1; MFI; Significance analysis of microarrays; PBST; MIP-1α; immunodeficiency; thymoma; ACAA; PAP; SAM
• ISSN: 0091-6749; 1097-6825
• DOI: 10.1016/j.jaci.2015.07.032

Background Anti-cytokine autoantibodies (ACAAs) are pathogenic in a handful of rare immunodeficiencies. However, the prevalence and significance of other ACAAs across immunodeficiencies have not yet been described. Objective We profiled ACAAs in a diverse cohort of serum samples from patients with immunodeficiency and assessed the sensitivity and specificity of protein microarrays for ACAA identification and discovery. Methods Highly multiplexed protein microarrays were designed and fabricated. Blinded serum samples from a cohort of 58 immunodeficiency patients and healthy control subjects were used to probe microarrays. Unsupervised hierarchical clustering was used to identify clusters of reactivity, and after unblinding, significance analysis of microarrays was used to identify disease-specific autoantibodies. A bead-based assay was used to validate protein microarray results. Blocking activity of serum containing ACAAs was measured in vitro. Results Protein microarrays were highly sensitive and specific for the detection of ACAAs in patients with autoimmune polyendocrine syndrome type I and pulmonary alveolar proteinosis, detecting ACAA levels consistent with those reported in the published literature. Protein microarray results were validated by using an independent bead-based assay. To confirm the functional significance of these ACAAs, we tested and confirmed the blocking activity of select ACAAs in vitro. Conclusion Protein microarrays are a powerful tool for ACAA detection and discovery, and they hold promise as a diagnostic for the evaluation and monitoring of clinical immunodeficiency.