Fecal Dysbiosis and Inflammation in Intestinal-Specific Cftr Knockout Mice on Regimens Preventing Intestinal Obstruction

• Published in: Physiological genomics Vol. 56; no. 3; pp. 247 - 264
• Main Authors: Young, Sarah M, Woode, Rowena A, Williams, Estela C, Ericsson, Aaron C, Clarke, Lane L
• Format: Journal Article
• Language: English
• Published: United States American Physiological Society 01.03.2024
• Subjects: Akkermansia; Animal models; Cystic fibrosis; Dysbacteriosis; Epithelium; Feces; Inflammation; Intestinal microflora; Intestine; Leukocytes; Microbiomes; Polyethylene glycol; Proteobacteria; rRNA 16S; gut microbiome; intestine; calprotectin; cystic fibrosis
• ISSN: 1094-8341; 1531-2267; 1531-2267
• DOI: 10.1152/physiolgenomics.00077.2023

Chronic intestinal inflammation is a poorly understood manifestation of Cystic Fibrosis (CF), which may be refractory to ion channel CFTR modulator therapy. People with CF exhibit intestinal dysbiosis which has potential for stimulating intestinal and systemic inflammation. CFTR is expressed in organ epithelia and in the leukocyte population. Here, we investigate the contribution of intestinal epithelial-specific loss of Cftr (iCftr KO) to dysbiosis and inflammation in mice treated with either of two anti-obstructive dietary regimens necessary to maintain CF mouse models (PEG laxative or a liquid diet, LiqD). Feces collected from iCftr KO mice and their wildtype (WT) sex-matched littermates were used to measure fecal calprotectin and to perform 16S rRNA sequencing to characterize the gut microbiome. Fecal calprotectin was elevated in iCftr KO relative to WT samples of mice consuming either PEG or LiqD. PEG iCftr KO mice did not show a change in a-diversity versus WT but demonstrated a significant difference in microbial composition (b-diversity) with increases in phylum , family , four genera of including , and mucolytic genus . Fecal microbiome analysis of LiqD iCftr KO mice showed both decreased a-diversity and differences in microbial composition with increases in family , families and , and enrichment of , , , mucolytic , and reduction of . It was concluded that epithelial-specific loss of Cftr is a major driver of CF intestinal dysbiosis and inflammation with significant similarities to previous studies of global Cftr KO mice.