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. 1997 Jul;91(3):399–405. doi: 10.1046/j.1365-2567.1997.00279.x

T-cell epitopes recognized within the 65,000 MW hsp in patients with IgA nephropathy.

K Warr 1, F Fortune 1, S Namie 1, A Wilson 1, T Shinnick 1, R Van der Zee 1, G Williams 1, T Lehner 1
PMCID: PMC1364009  PMID: 9301529

Abstract

IgA nephropathy (IgAN) is the commonest cause of glomerulonephritis and clinical exacerbation of IgAN is frequently associated with mucosal infection. T-cell receptor gamma delta (TCR gamma delta+) cells are increased in both the circulation and in renal biopsies of patients with progressive IgAN. We examined the hypothesis that specific peptides within the 65,000 MW heat-shock protein (hsp) might stimulate TCR gamma delta cells and play a part in the immunopathogenesis of IgAN. We studied T-cell proliferative responses stimulated by overlapping peptides derived from the sequence of mycobacterial 65,000 MW hsp. Three T-cell epitopes have been identified (peptides 51-65, 71-85 and 281-295). The three peptides have a synergistic effect and they stimulate significantly higher proliferation of T cells in patients with IgAN than in disease or healthy controls. This response was inhibited by monoclonal antibodies (mAb) to TCR gamma delta+ and human leucocyte antigen (HLA) class I, but not by mAb to HLA class II. The involvement of TCR gamma delta+ cells was confirmed by up-regulation of the proportion of TCR gamma delta+ cells when stimulated with the three specific peptides. We suggest that IgAN might be associated with mucosal infection by a variety of micro-organisms and that peptides within the microbial hsp cross-react with the homologous human hsp which may stimulate TCR gamma delta+ cells and play a part in the pathogenesis of IgAN.

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Selected References

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