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Evaluation of Specific Antibody Responses in Patients With Selective Iga Deficiency and Ataxia Telangiectasia Publisher Pubmed



Khanmohammadi S1, 2 ; Shad TM1, 2 ; Delavari S1, 2 ; Shirmast P1 ; Bagheri Y3 ; Azizi G4 ; Aghamohammadi A1 ; Abolhassani H1, 5 ; Yazdani R1, 6 ; Rezaei N1, 6
Authors
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Authors Affiliations
  1. 1. Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children’s Medical Center, Tehran University of Medical Science, Tehran, Iran
  2. 2. Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Tehran, Iran
  3. 3. Clinical Research Development Unit (CRDU), 5 Azar Hospital, Golestan University of Medical Sciences, Gorgan, Iran
  4. 4. Non-Communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran
  5. 5. Division of Clinical Immunology, Department of Laboratory Medicine, Karolinska Institute at Karolinska University Hospital Huddinge, Stockholm, Sweden
  6. 6. Primary Immunodeficiency Diseases Network (PIDNet), Universal Scientific Education and Research Network (USERN), Tehran, Iran

Source: Endocrine# Metabolic and Immune Disorders - Drug Targets Published:2022


Abstract

Background: Specific Antibody Deficiency (SAD) is a primary immunodefi-ciency disease (PID) characterized by the occurrence of recurrent infections and inadequate antibody response to polysaccharide new antigens. Objective: This study aims to determine the titer of specific antibodies against unconju-gated 23-valent pneumococcal polysaccharide vaccine (PPSV-23), the presence of SAD, and its association with clinical and laboratory findings in Ataxia-telangiectasia (A-T) and selective immunoglobulin A deficiency (SIgAD) patients. Methods: 32 A-T patients and 43 SIgAD patients were included in this cross-sectional study. Samples of the patients were obtained before and three weeks after vaccination with PPSV-23. Specific immunoglobulin G (IgG) directed towards pneumococcal capsular antigen and specific antibodies against whole pneumococcal antigens was measured. Results: Comparison of the response to vaccination revealed that 81.3% of A-T patients and 18.6% of the SIgAD patients had an inadequate response to PPSV-23 (p<0.001). The prevalence of recurrent infection (p=0.034) and pneumonia (p=0.003) in SIgAD patients was significantly higher in non-responders than responders. Likewise, the number of marginal zone B cells (p=0.037), transitional B cells (p=0.019), plasmablasts (p=0.019), CD8+ naive T cells (p=0.036), and percentage of CD8+ T cells (p=0.047), switched memory B cells (SMB) (p=0.026) and immunoglobulin M (IgM) memory B cells (p=0.022) in SIgAD patients were significantly lower in non-responder group than responder group. In con-trast, the percentage of CD4 T+ cells in A-T patients was lower in the non-responder group than responders (p=0.035). Conclusion: SAD is more frequent in A-T patients than SIgAD patients. The role of SMB and T cells should not be underestimated in SAD. © 2022 Bentham Science Publishers.
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