Journal
NEPHROLOGY DIALYSIS TRANSPLANTATION
Volume 34, Issue 7, Pages 1135-1144Publisher
OXFORD UNIV PRESS
DOI: 10.1093/ndt/gfy323
Keywords
antibiotics; GALT; gut microbiome; IgA; IgA nephropathy
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Funding
- LABEX Inflamex [ANR-11-IDEX-000502]
- Agence Nationale pour la Recherche Jeune Chercheur TRAIN, Departement hospitalo-universitaire FIRE projet Emergence et Association pour l'Information et la Recherche sur les maladies Renales Genetiques-France
- HUPNVS of Assistance Publique Hopitaux de Paris
- Equipe Fondation pour la Recherche Medicale
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Background Immunoglobulin A nephropathy (IgAN) is the most common primary glomerulonephritis worldwide. IgA is mainly produced by the gut-associated lymphoid tissue (GALT). Both experimental and clinical data suggest a role of the gut microbiota in this disease. We aimed to determine if an intervention targeting the gut microbiota could impact the development of disease in a humanized mouse model of IgAN, the alpha 1(KI)-CD89(Tg) mice. Methods Four- and 12-week old mice were divided into two groups to receive either antibiotics or vehicle control. Faecal bacterial load and proteinuria were quantified both at the beginning and at the end of the experiment, when blood, kidneys and intestinal tissue were collected. Serum mouse immunoglobulin G (mIgG) and human immunoglobulin A1 (hIgA1)-containing complexes were quantified. Renal and intestinal tissue were analysed by optical microscopy after haematoxylin and eosin colouration and immunohistochemistry with anti-hIgA and anti-mouse CD11b antibodies. Results Antibiotic treatment efficiently depleted the faecal microbiota, impaired GALT architecture and impacted mouse IgA production. However, while hIgA1 and mIgG serum levels were unchanged, the antibiotic treatment markedly prevented hIgA1 mesangial deposition, glomerular inflammation and the development of proteinuria. This was associated with a significant decrease in circulating hIgA1-mIgG complexes. Notably, final faecal bacterial load strongly correlated with critical clinical and pathophysiological features of IgAN such as proteinuria and hIgA1-mIgG complexes. In addition, treatment with broad-spectrum antibiotics reverted established disease. Conclusions These data support an essential role of the gut microbiota in the generation of mucosa-derived nephrotoxic IgA1 and in IgAN development, opening new avenues for therapeutic approaches in this disease.
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