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  • Title: Kidney involvement in autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy in a Finnish cohort.
    Author: Kluger N, Kataja J, Aho H, Rönn AM, Krohn K, Ranki A.
    Journal: Nephrol Dial Transplant; 2014 Sep; 29(9):1750-7. PubMed ID: 24711434.
    Abstract:
    BACKGROUND: Autoimmune tubulo-interstitial nephritis (TIN) is a rare complication of autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED). Previous data on TIN and other renal or urologic manifestations of APECED are sparse. METHODS: We performed a retrospective study on the urinary and renal tract diseases in a cohort of 30 Finnish patients with APECED (mean age 40 years), with special emphasis on the clinical presentation and the immunologic characteristics of TIN. Clinical and laboratory findings, specific anticytokine and kidney-specific antibodies were analysed. RESULTS: Five of the 30 (17%) patients had moderate-to-severe renal failure, including 3 (10%) with TIN, leading to either transplantation, haemodialysis or immunosuppressive treatment. No other cause other than APECED was found for the TIN. All three patients with TIN had circulating antibodies against the distal part of the nephron, as did 30% of all cohort cases. Two had nephrocalcinosis, and two had renal tubular acidosis type 1. Immunosuppressive therapy with mycophenolate mofetil or rituximab in one pediatric case did not revert the TIN, however. CONCLUSIONS: Renal failure should raise concern for TIN in APECED. It discloses some specific features: no uveitis, no glycosuria and inconstant urinalysis anomalies. Regular renal monitoring for any APECED patient should be performed. Circulating antibodies against the distal part of the nephron are frequent and present in all TIN patients, but their pathologic significance is not yet known. Future studies will be needed to understand the triggers leading to overt clinical disease in these patients.
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