ANCA patients have T cells responsive to complementary PR-3 antigen

Kidney Int. 2008 Nov;74(9):1159-69. doi: 10.1038/ki.2008.309. Epub 2008 Jul 2.


Some patients with proteinase 3 specific anti-neutrophil cytoplasmic autoantibodies (PR3-ANCA) also have antibodies that react to complementary-PR3 (cPR3), a protein encoded by the antisense RNA of the PR3 gene. To study whether patients with anti-cPR3 antibodies have cPR3-responsive memory T cells we selected conditions that allowed cultivation of memory cells but not naïve cells. About half of the patients were found to have CD4+TH1 memory cells responsive to the cPR3(138-169)-peptide; while only a third of the patients had HI-PR3 protein responsive T cells. A significant number of T cells from patients responded to cPR3(138-169) peptide and to HI-PR3 protein by proliferation and/or secretion of IFN-gamma, compared to healthy controls while there was no response to scrambled peptide. Cells responsive to cPR3(138-169)-peptide were not detected in MPO-ANCA patients suggesting that this response is specific. The HLADRB1(*) 15 allele was significantly overrepresented in our patient group and is predicted to bind cPR3(138-169) peptide with high affinity. Regression analysis showed a significant likelihood that anti-cPR3 antibodies and cPR3-specific T cells coexist in individuals, consistent with an immunological history of encounter with a PR3-complementary protein. We suggest that the presence of cells reacting to potential complementary protein pairs might provide an alternative mechanism for auto-immune diseases.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adult
  • Aged
  • Antibodies, Antineutrophil Cytoplasmic / immunology*
  • Autoantibodies / immunology
  • Autoimmune Diseases / etiology
  • Autoimmune Diseases / immunology
  • Case-Control Studies
  • Female
  • HLA-DR Antigens / analysis
  • HLA-DR Antigens / metabolism
  • HLA-DRB1 Chains
  • Humans
  • Lymphocyte Activation
  • Male
  • Middle Aged
  • Myeloblastin / immunology*
  • Peptide Fragments / immunology*
  • T-Lymphocytes / immunology*
  • Th1 Cells / immunology
  • Young Adult


  • Antibodies, Antineutrophil Cytoplasmic
  • Autoantibodies
  • HLA-DR Antigens
  • HLA-DRB1 Chains
  • HLA-DRB1*15 antigen
  • Peptide Fragments
  • complementary PR3 (138-169), human
  • Myeloblastin