Functional Analysis of the Transcriptional Regulator IκB-ζ in Intestinal Homeostasis

Tomoki Sasaki, Hiroyuki Nagashima, Atsushi Okuma, Takeshi Yamauchi, Kenshi Yamasaki, Setsuya Aiba, Takanori So, Naoto Ishii, Yuji Owada, Takashi MaruYama, Shuhei Kobayashi

Research output: Contribution to journalArticlepeer-review


Background: The Toll-like receptor signaling pathway contributes to the regulation of intestinal homeostasis through interactions with commensal bacteria. Although the transcriptional regulator IκB-ζ can be induced by Toll-like receptor signaling, its role in intestinal homeostasis is still unclear. Aims: To investigate the role of IκB-ζ in gut homeostasis. Methods: DSS-administration induced colitis in control and IκB-ζ-deficient mice. The level of immunoglobulins in feces was detected by ELISA. The immunological population in lamina propria (LP) was analyzed by FACS. Results: IκB-ζ-deficient mice showed severe inflammatory diseases with DSS administration in the gut. The level of IgM in the feces after DSS administration was less in IκB-ζ-deficient mice compared to control mice. Upon administration of DSS, IκB-ζ-deficient mice showed exaggerated intestinal inflammation (more IFN-g-producing CD4+ T cells in LP), and antibiotic treatment canceled this inflammatory phenotype. Conclusion: IκB-ζ plays a crucial role in maintaining homeostasis in the gut.

Original languageEnglish
Pages (from-to)1252-1259
Number of pages8
JournalDigestive Diseases and Sciences
Issue number4
Publication statusPublished - 2022 Apr


  • Gut homeostasis
  • Inflammatory bowel disease (IBD)
  • IκB-ζ


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