Celiac disease-type tissue transglutaminase autoantibody deposits in kidney biopsies of patients with IgA nephropathy

Research output: Contribution to journalArticleScientificpeer-review

Abstract

An association between celiac disease and IgA nephropathy (IgAN) has been suggested. In celiac disease, in addition to circulating in serum, IgA-class tissue transglutaminase (tTG) autoanti-bodies are deposited in the small bowel mucosa and extraintestinal organs. In this case series of IgAN patients with or without celiac disease, we studied whether celiac disease-type IgA-tTG deposits occur in kidney biopsies. The study included nine IgAN patients, four of them with celiac disease. At the time of the diagnostic kidney biopsy serum tTG autoantibodies were measured and colocalization of IgA and tTG was investigated in the frozen kidney biopsies. Three IgAN patients with celiac disease had IgA-tTG deposits in the kidney even though in two of these the celiac disease diagnosis had been set years later. These deposits were not found in a patient with already diagnosed celiac disease following a gluten-free diet. Of the five non-celiac IgAN patients, three had IgA-tTG deposits in the kidney. We conclude that tTG-targeted IgA deposits can be found in the kidney biopsies of gluten-consuming IgAN patients but their specificity to celiac disease seems limited.

Original languageEnglish
Article number1594
JournalNutrients
Volume13
Issue number5
DOIs
Publication statusPublished - May 2021
Publication typeA1 Journal article-refereed

Keywords

  • Celiac disease
  • IgA nephropathy
  • Tissue transglutaminase autoantibody
  • Tissue transglutaminase-targeted IgA deposits

Publication forum classification

  • Publication forum level 1

ASJC Scopus subject areas

  • Food Science
  • Nutrition and Dietetics

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