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Objectives: Mesangial deposition of aberrantly glycosylated IgA1 (agIgA1) and its immune complex is an initial and key pathogenic mechanism in IgA nephropathy (IgAN).The present study tested the hypothesis that bacteria-derived IgA proteases may be able to degrade the deposited agIgA1 and its immune complex locally in the mesangium and may represent a novel therapy for IgAN.