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Mapping novel immunogenic epitopes in IgA nephropathy.

Sang Hoon Woo1, Tara K Sigdel2, Van T Dinh2

  • 1Division of Hospital Medicine, Department of Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania;

Clinical Journal of the American Society of Nephrology : CJASN
|December 28, 2014
PubMed
Summary

This study identified novel IgA autoantibodies in IgA nephropathy (IgAN). These autoantibodies target kidney proteins and may contribute to IgAN disease progression, offering new insights into this glomerular disease.

Keywords:
IgA nephropathynephritisprimary GN

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Area of Science:

  • Nephrology
  • Immunology
  • Pathogenesis of Glomerular Diseases

Background:

  • Immunoglobulin A (IgA) is crucial in IgA nephropathy (IgAN) pathogenesis.
  • Immune complexes of IgA deposit in glomeruli, triggering inflammation.
  • Antigenic targets and IgA functions in IgAN remain incompletely understood.

Purpose of the Study:

  • To identify novel IgA autoantibodies and their targets in IgA nephropathy.
  • To investigate the role of these autoantibodies in IgAN pathogenesis and progression.
  • To correlate IgA autoantibody levels with clinical and histological findings in IgAN patients.

Main Methods:

  • Prospective observational study of 22 IgAN patients with biopsy-proven disease and at least 5 years of follow-up.
  • Protein microarray analysis of ~9000 human antigens to detect IgA autoantibodies in IgAN patients, healthy controls, and non-IgAN glomerular disease patients.
  • Validation by ELISA and immunohistochemistry; correlation of antibody levels with clinical and histological variables.

Main Results:

  • Fifty-four proteins showed significant IgA antibody responses in IgAN patients.
  • Elevated IgA antibodies against tissue transglutaminase, DDX4, and ZADH2 were observed.
  • IgA antibodies to DDX4 and ZADH2 correlated significantly with declining renal function.

Conclusions:

  • IgA autoantibodies target novel proteins highly expressed in kidney glomeruli and tubules.
  • These autoantibodies may play a significant role in IgA nephropathy pathogenesis.
  • The findings provide preliminary evidence for new therapeutic targets in IgAN.