Monoclonal antibodies associated IgA nephropathy or other nephropathies.

The use of monoclonal antibodies (mAbs) has revolutionized the treatment of autoimmune, inflammatory, and neoplastic diseases. However, accumulating evidence indicates that biologic therapies may be associated with renal adverse events, including various types of glomerulonephritis. The aim of this review was to summarize all reports available in the scientific literature regarding the occurrence of IgA nephropathy after monoclonal antibody treatment. Additionally, the risk of other glomerulonephritis after biologic therapy was discussed. IgA nephropathy (IgAN) is the most commonly reported glomerular lesion associated with monoclonal antibody therapy, particularly with TNF-α inhibitors such as infliximab, adalimumab, golimumab, and etanercept, as well as with immune checkpoint inhibitors targeting the PD-1 (pembrolizumab, nivolumab) and interleukin (ustekinumab) pathways. Proposed mechanisms include immune dysregulation with a shift toward Th2 and Th17-dependent responses, increased production of galactose-deficient IgA1, complement activation, formation of circulating immune complexes, and loss of immune tolerance. In some cases, drug discontinuation and glucocorticoid therapy have resulted in partial or complete disease remission, although progression to end-stage renal disease has also been reported. Due to the potential severity of these complications, initial and periodic monitoring of renal function and urinalysis are recommended in patients receiving monoclonal antibody therapy. Early recognition of renal involvement and prompt treatment modification can improve prognosis.