Abstract
Recent data suggest that gut-associated lymphoid tissue (GALT) plays a major role in the development of immunoglobulin A (IgA) nephropathy (IgAN). A genome-wide association study showed that most loci associated with the risk of IgAN are also associated with immune-mediated inflammatory bowel diseases, maintenance of the intestinal barrier and regulation of response to gut pathogens. Studies involving experimental models have demonstrated a pivotal role of intestinal microbiota in the development of IgAN in mice producing high levels of IgA and in transgenic mice overexpressing BAFF, a B-cell factor crucial for IgA synthesis, indicating the role of genetic background, B-cell activity, GALT intestinal immunity and diet. The effect of diet was suggested by pilot studies carried out 30 years ago which showed that a gluten-rich diet induced IgAN in mice and that some patients benefited from a gluten-free diet. A recent experimental model in mice expressing human IgA1 and Fc alpha receptor CD89 reported clinical and histological improvement after a gluten-free diet. Clinical observations have elicited new interest in GALT hyper-reactivity in IgAN patients. In a pilot study, a reduction in proteinuria was attained using an enteric controlled-release formulation of the corticosteroid budesonide targeted to the Peyer’s patches at the ileocecal junction. This formulation was tested in the placebo-controlled NEFIGAN phase 2b trial, with a reduction in proteinuria after 9 months of treatment together with stabilization of renal function in patients with persistent proteinuria. In conclusion, the gut–kidney axis modulated by microbiota and diet is a promising target for focused treatment of IgAN in genetically predisposed patients at risk of progression.
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Coppo, R. The gut–kidney axis in IgA nephropathy: role of microbiota and diet on genetic predisposition. Pediatr Nephrol 33, 53–61 (2018). https://doi.org/10.1007/s00467-017-3652-1
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DOI: https://doi.org/10.1007/s00467-017-3652-1