Autoreactive T-cells in Goodpasture's syndrome recognize the N-terminal NC1 domain on α3 type IV collagen

Goodpasture's syndrome is mediated by immunopathogenic autoantibodies to the α3 NC1 domain of type IV collagen. It is not known whether collaborating T-cells participate in this autoreactive response. Here we describe the first T-cell clone isolated from a Goodpasture patient autoreactive to α3 type IV collagen of glomerular basement membrane. To investigate cellular autoreactivity, T-cells from Goodpasture patients or controls were isolated and stimulated by purified native or recombinant type IV collagen proteins and synthetic oligopeptides. Cell surface markers, the T-cell receptor repertoire, and MHC-restriction were analyzed. T-cell clones specific for the α3(IV) NC1 domain were established in two Goodpasture patients, but not in controls. One of the three CD8⁺ T-cell clones was characterized further. It was MHC class I restricted (HLA-A11) and expressed the T-cell receptor Vβ 5.1. chain. This clone specifically recognized a motif at the N-terminal area of the α3(IV) NC1 domain (AA 51 to 59: GSPATWTTR). We conclude that autoreactive T-cells exists in Goodpasture patients and may play a crucial role in the inflammatory process. T-cell clones are autoreactive to the α3(IV) NC1 domain. At least for one of the clones, the T-cell epitope is different from the putative antibody-binding site.