Long-Term Iron Deficiency and Dietary Iron Excess Exacerbate Acute Dextran Sodium Sulphate-Induced Colitis and Are Associated with Significant Dysbiosis

Mahalhal, Awad, Burkitt, Michael D, Duckworth, Carrie A ORCID: 0000-0001-9992-7540, Hold, Georgina L, Campbell, Barry J ORCID: 0000-0002-7407-012X, Pritchard, David Mark ORCID: 0000-0001-7971-3561 and Probert, Chris S ORCID: 0000-0003-0477-6714 (2021) Long-Term Iron Deficiency and Dietary Iron Excess Exacerbate Acute Dextran Sodium Sulphate-Induced Colitis and Are Associated with Significant Dysbiosis. INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, 22 (7). 3646-.

Access the full-text of this item by clicking on the Open Access link.

Official URL: http://dx.doi.org/10.3390/ijms22073646

Abstract

<h4>Background</h4>Oral iron supplementation causes gastrointestinal side effects. Short-term alterations in dietary iron exacerbate inflammation and alter the gut microbiota, in murine models of colitis. Patients typically take supplements for months. We investigated the impact of long-term changes in dietary iron on colitis and the microbiome in mice.<h4>Methods</h4>We fed mice chow containing differing levels of iron, reflecting deficient (100 ppm), normal (200 ppm), and supplemented (400 ppm) intake for up to 9 weeks, both in absence and presence of dextran sodium sulphate (DSS)-induced chronic colitis. We also induced acute colitis in mice taking these diets for 8 weeks. Impact was assessed (i) clinically and histologically, and (ii) by sequencing the V4 region of <i>16S</i> rRNA.<h4>Results</h4>In mice with long-term changes, the iron-deficient diet was associated with greater weight loss and histological inflammation in the acute colitis model. Chronic colitis was not influenced by altering dietary iron however there was a change in the microbiome in DSS-treated mice consuming 100 ppm and 400 ppm iron diets, and control mice consuming the 400 ppm iron diet. Proteobacteria levels increased significantly, and Bacteroidetes levels decreased, in the 400 ppm iron DSS group at day-63 compared to baseline.<h4>Conclusions</h4>Long-term dietary iron alterations affect gut microbiota signatures but do not exacerbate chronic colitis, however acute colitis is exacerbated by such dietary changes. More work is needed to understand the impact of iron supplementation on IBD. The change in the microbiome, in patients with colitis, may arise from the increased luminal iron and not simply from colitis.

Item Type:	Article
Uncontrolled Keywords:	iron, diet, intestinal inflammation, inflammatory bowel disease, fecal microbiota
Divisions:	Faculty of Health and Life Sciences Faculty of Health and Life Sciences > Institute of Infection, Veterinary and Ecological Sciences Faculty of Health and Life Sciences > Institute of Systems, Molecular and Integrative Biology
Depositing User:	Symplectic Admin
Date Deposited:	22 Apr 2021 10:23
Last Modified:	16 Nov 2023 15:12
DOI:	10.3390/ijms22073646
Open Access URL:	http://doi.org/10.3390/ijms22073646
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3120171