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Open Access 09-07-2022 | Crohn's Disease | Original Article

Crohn’s disease may promote inflammation in IgA nephropathy: a case–control study of patients undergoing kidney biopsy

Authors: Minako Akiyama, Kosuke Shimomura, Hiroshi Yoshimoto, Minako Sako, Makoto Kodama, Keiko Abe, Mariko Gunji, Dedong Kang, Takashi Takaki, Yukihiro Wada, Masayuki Iyoda, Kazuho Honda

Published in: Virchows Archiv | Issue 4/2022

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Abstract

Intestinal immunity has been closely associated with the pathogenesis and progression of renal diseases, a relationship known as the “gut–kidney axis.” To determine the association between immunoglobulin A nephropathy (IgAN) and Crohn’s disease (CD), a clinico-pathological study was performed on patients who had IgAN with CD (CD-IgAN) and without CD (NOS-IgAN). We enrolled 29 patients diagnosed with IgAN via renal biopsy at the Tokyo Yamate Medical Center from 2009 to 2017. The patients were divided into CD-IgAN (n = 18) and NOS-IgAN (n = 11) and evaluated for clinical and pathological findings. IgA subclasses and galactose-deficient IgA1 (Gd-IgA1) were examined via immunohistochemistry using formalin-fixed paraffin-embedded sections from renal biopsy. Our results showed no significant difference in the extent of mesangial IgA subclasses or Gd-IgA1 deposition according to the presence or absence of CD. Pathologically, however, those with CD-IgAN had remarkably higher percentage of global glomerulosclerosis and extent of interstitial fibrosis and tubular atrophy (IF/TA) compared to those with NOS-IgAN. Moreover, the extent of macrophage infiltration in the glomerulus and interstitium was significantly higher in CD-IgAN than in NOS-IgAN. Clinically, the CD-IgAN group had significantly worse responsiveness to steroid treatment compared to the NOS-IgAN group. In conclusion, the similar immunological characteristics of deposited IgA molecules in the glomeruli between the CD-IgAN and NOS-IgAN groups might suggest their etiological similarity. However, a renal pathology showing advanced glomerular and tubulointerstitial sclerosis accompanying increased macrophage infiltration and highly resistant clinical features in patients with CD-IgAN suggests that some pathophysiological factors in CD, including abnormal intestinal immunity, may promote and activate the inflammatory process in IgAN via undetermined mechanisms.
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Metadata
Title
Crohn’s disease may promote inflammation in IgA nephropathy: a case–control study of patients undergoing kidney biopsy
Authors
Minako Akiyama
Kosuke Shimomura
Hiroshi Yoshimoto
Minako Sako
Makoto Kodama
Keiko Abe
Mariko Gunji
Dedong Kang
Takashi Takaki
Yukihiro Wada
Masayuki Iyoda
Kazuho Honda
Publication date
09-07-2022
Publisher
Springer Berlin Heidelberg
Published in
Virchows Archiv / Issue 4/2022
Print ISSN: 0945-6317
Electronic ISSN: 1432-2307
DOI
https://doi.org/10.1007/s00428-022-03373-w