INTESTINAL DYSBIOSIS OCCURS IN IRON DEFICIENCY AS WELL AS ACTIVE IBD

Mahalhal, Awad, Subramanian, Sreedhar, Pritchard, DM ORCID: 0000-0001-7971-3561 and Probert, CS ORCID: 0000-0003-0477-6714 (2018) INTESTINAL DYSBIOSIS OCCURS IN IRON DEFICIENCY AS WELL AS ACTIVE IBD In: Colon and Anorectum.

Text BSG 2018 Mahalhal A. .pdf - Author Accepted Manuscript Download (268kB)

Abstract

We have previously shown that decreases or increases in dietary iron exacerbate murine models of inflammatory bowel disease (IBD). Active IBD is associated with a dysbiosis typified by a reduction in Bacteroidetes and an increase in Firmicutes. We have investigated the human intestinal microbiome in relation to luminal iron, by studying patients with iron deficiency anaemia (IDA) and inactive/active IBD. We report results of changes at the phylum level. Bacterial gDNA was extracted from faeces of patients with IDA (10), Crohn’s disease (CD 6 active, 24 inactive), ulcerative colitis (UC 7 active, 13 inactive) and healthy controls (24). Faecal iron and calprotectin were assayed by ELISA. Microbiota composition was determined from the sequence of V4 region of 16 S rDNA on the Illumina MiSeq platform. Statistical inferences were made using Welch’s t-test with post-hoc analysis (Bioinformatics 2010; 26:715–21). Shannon Diversity Index (SDI) and Principal Component Analysis (PCA) were employed to compare population and phylum-level changes among study groups. Faecal iron concentrations were least in IDA (ANOVA, p=0.001) and significantly lower in IDA than each other group (post hoc p<0.05 for all comparisons). Calprotectin concentrations were increased in association with IBD disease activity. Faecal phyla changes were seen in IDA as well as in IBD: Proteobacteria were markedly reduced in IDA (1.4%) compared to active IBD (15.5%); IBD and IDA were associated with increased proportions of Firmicutes (p=0.01 and p=0.05 respectively). Dysbiosis occurred in IDA as well as in active IBD. Proteobacteria are clearly iron-responsive: the increase in luminal iron associated with active IBD appears to promote their growth and might contribute to the excess of this phylum during relapse. The changes in Bacteroidetes appear independent of luminal iron, unlike Firmicutes. The influence of iron deficiency and supplementation upon the colonic microbiome warrants further investigation.

Item Type:	Conference Item (Unspecified)
Uncontrolled Keywords:	32 Biomedical and Clinical Sciences, 3202 Clinical Sciences, 3210 Nutrition and Dietetics, Crohn's Disease, Inflammatory Bowel Disease, Microbiome, Autoimmune Disease, Dietary Supplements, Digestive Diseases, Clinical Research, Nutrition, 2.1 Biological and endogenous factors, Oral and gastrointestinal, 3 Good Health and Well Being
Depositing User:	Symplectic Admin
Date Deposited:	12 Oct 2018 09:49
Last Modified:	08 Oct 2026 21:08
DOI:	10.1136/gutjnl-2018-BSGAbstracts.384
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3027456
Disclaimer:	The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate.