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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Incidence and disease associations of a proteinase 3-antineutrophil cytoplasmic antibody idiotype (5/7 Id) whose antiidiotype inhibits proteinase 3-antineutrophil cytoplasmic antibody antigen binding activity.

OBJECTIVE: To evaluate the potential of a monoclonal proteinase 3-antineutrophil cytoplasmic antibody (PR3-ANCA) antiidiotype autoantibody (5/7 anti-Id) as a candidate for specific immunotherapy in Wegener's granulomatosis ( WG), and to estimate the immunodiagnostic value of the corresponding idiotype (5/7 Id). METHODS: We analyzed the incidence of 5/7 Id in patients with ANCA-associated vasculitides ( WG, microscopic polyangiitis, Churg-Strauss syndrome), in disease controls (systemic lupus erythematosus patients), and in healthy donors. We then investigated the presence of 5/7 Id in relation to disease stage, clinical activity, and organ manifestations in 86 patients with WG. Finally, we investigated the ability of the 5/7 anti-Id reagent to inhibit the binding of PR3-ANCA to corresponding antigen in 19 WG patients. RESULTS: The incidence of 5/7 Id was significantly more frequent in WG patients (43 of 86; 50%). We did not find a significant correlation between the prevalence of idiotype expression and disease activity or organ manifestations. Further, we demonstrated in vitro suppression of PR3-ANCA antigen binding activity by 5/7 anti-Id in 11 of 19 WG patients who were positive for 5/7 Id. CONCLUSION: This study shows that 5/7 Id is a common idiotype with a significantly increased incidence in WG and that 5/7 anti-Id inhibits PR3-ANCA antigen binding activity. Based on these observations, we conclude that 5/7 anti-Id is a promising tool for the development of a specific immunotherapy for WG.[1]

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