1. Zranb1-mutant mice display abnormal colonic mucus production and exacerbation of DSS-induced colitis.
- Author
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Tamura A, Ito G, Matsuda H, Nibe-Shirakihara Y, Hiraoka Y, Kitagawa S, Hiraguri Y, Nagata S, Aonuma E, Otsubo K, Nemoto Y, Nagaishi T, Watanabe M, Okamoto R, and Oshima S
- Subjects
- Animals, Cysteine metabolism, Deubiquitinating Enzymes metabolism, Dextran Sulfate toxicity, Inflammation pathology, Mice, Mucins metabolism, Mucus metabolism, RNA, Messenger genetics, Serine metabolism, Colitis chemically induced, Colitis genetics, Colitis metabolism, Intestinal Mucosa metabolism, Intestinal Mucosa pathology, Ubiquitin-Specific Proteases genetics, Ubiquitin-Specific Proteases metabolism
- Abstract
Expression of mucin MUC2, a component of the colonic mucus layer, plays a crucial role in intestinal homeostasis. Here, we describe a new regulator of MUC2 expression, the deubiquitinase ZRANB1 (Trabid). A ZRANB1 mutation changing cysteine to serine in amino acid position 443, affects ubiquitination. To analyze ZRANB1 function in the intestine, we generated Zranb1 C443S mutant knock-in (Zranb1
C443S/C443S ) mice using the CRISPR/Cas9 system. Zranb1C443S/C443S mice exhibited decreased mRNA expression and MUC2 production. Colonic organoids from Zranb1C443S/C443S mice displayed decreased Muc2 mRNA expression following differentiation into goblet cells. Finally, we analyzed dextran sulfate sodium-induced colitis to understand ZRANB1's role in intestinal inflammation. Zranb1C443S/C443S mice with colitis exhibited significant weight loss, reduced colon length, and worsening clinical and pathological scores, indicating that ZRANB1 contributes to intestinal homeostasis. Together, these results suggest that ZRANB1 regulates MUC2 expression and intestinal inflammation, which may help elucidating the pathogenesis of inflammatory bowel disease and developing new therapeutics targeting ZRANB1., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Inc. All rights reserved.)- Published
- 2022
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