What question did this study set out to answer?

To explore the interactions between the immune system and microbiota in ileal tissues of Crohn’s disease patients.

P0015The Dynamics of the Immune-Microbiota Axis in Ileal Tissue Layers of Patients with Crohn’s Disease

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Characterizes immune responses and microbiota in ileal tissue layers of Crohn’s disease patients, highlighting implications for recurrence.

To explore the interactions between the immune system and microbiota in ileal tissues of Crohn’s disease patients.
Enrolled 28 patients with Crohn’s disease, collecting damaged and non-damaged mucosal tissues and blood samples.
Assessed bacterial composition via 16S rRNA gene amplicon sequencing.
Evaluated systemic microRNA levels using quantitative real-time PCR amplification.
Analyzed free fatty acids through gas chromatography-mass spectrometry.
Performed a comprehensive cytokine profile analysis in select patients using multiplex assays.
Healthy ileal mucosa had a richer microbiota compared to inflamed tissue.
Pathological conditions showed higher levels of Tenericutes and specific genera such as Mesoplasma and Mycoplasma.
Significant differences in bacteria between relapse and initial surgery patients regarding specific families and genera.
Downregulation of circulating microRNAs (miR-155 and miR-223) and certain fatty acids noted in relapse cases.
Distinct profiles of several cytokines and inflammatory markers found between Crohn's and healthy tissues, and among patient groups.

Amedei et al. (2026) studied this question.

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Characterizes immune responses and microbiota in ileal tissue layers of Crohn’s disease patients, highlighting implications for recurrence.