Gut-associated cGMP mediates colitis and dysbiosis in a mouse model of an activating mutation in GUCY2C
Open Access
- 21 September 2021
- journal article
- research article
- Published by Rockefeller University Press in The Journal of Experimental Medicine
- Vol. 218 (11)
- https://doi.org/10.1084/jem.20210479
Abstract
Activating mutations in receptor guanylyl cyclase C (GC-C), the target of gastrointestinal peptide hormones guanylin and uroguanylin, and bacterial heat-stable enterotoxins cause early-onset diarrhea and chronic inflammatory bowel disease (IBD). GC-C regulates ion and fluid secretion in the gut via cGMP production and activation of cGMP-dependent protein kinase II. We characterize a novel mouse model harboring an activating mutation in Gucy2c equivalent to that seen in an affected Norwegian family. Mutant mice demonstrated elevated intestinal cGMP levels and enhanced fecal water and sodium content. Basal and linaclotide-mediated small intestinal transit was higher in mutant mice, and they were more susceptible to DSS-induced colitis. Fecal microbiome and gene expression analyses of colonic tissue revealed dysbiosis, up-regulation of IFN-stimulated genes, and misregulation of genes associated with human IBD and animal models of colitis. This novel mouse model thus provides molecular insights into the multiple roles of intestinal epithelial cell cGMP, which culminate in dysbiosis and the induction of inflammation in the gut.Funding Information
- Department of Biotechnology, Ministry of Science and Technology, India (BT/PR15216/COE/34/02/2017)
- DBT-IISc partnership program (BT/PR27952/INF/22/212/2018/21.01.2019)
- JC Bose National Fellow (SB/S2/JCB-18/2013)
- Margdarshi Fellow
- Wellcome Trust DBT India Alliance (IA/M/16/502606)
- Helse Vest
- Center for International Health
- Department of Global Health and Primary Care
- University of Bergen
- PATH
- Royal Society (IC60080)
- Bill and Melinda Gates Grand Challenges (OPP1106646)
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