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Microbial Colonization in Adulthood Shapes the Intestinal Macrophage Compartment
Franziska Schmidt1,2, Katja Dahlke3, Arvind Batra4
1Medizinische Klinik für Gastroenterologie, Infektiologie und Rheumatologie, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany.
Journal of Crohn'S & Colitis
|April 3, 2019
Summary
Colonizing adult mice with gut microbiota restores intestinal macrophages over time. This process is crucial for immune system development and function, impacting inflammatory responses.
Area of Science:
- Immunology
- Microbiome Research
- Gastroenterology
Background:
- Early-life microbial exposure educates the immune system, protecting against immune-mediated diseases.
- The impact of colonization timing on intestinal macrophage development remains unclear.
Purpose of the Study:
- To investigate the effects of late-life microbiota colonization on intestinal macrophage populations.
- To compare the development and function of macrophages in early- versus late-colonized mice.
Main Methods:
- Germ-free mice were colonized with specific-pathogen-free (SPF) microbiota at 5 weeks of age.
- Intestinal macrophages were analyzed using immunohistochemistry, flow cytometry, and RNA sequencing.
- Dextran sulfate sodium (DSS)-induced colitis was used to assess functional differences and barrier integrity.
Main Results:
- Late colonization led to intestinal morphological restoration within a week, but ileal macrophages required 5 weeks for full recovery.
- Colonic macrophages were numerically unaffected but required microbiota for infiltration after DSS challenge.
- Colonized mice showed reduced inflammation and TNFα production post-DSS, suggesting immune desensitization.
Conclusions:
- Intestinal microbiota presence and time are critical for the numeric, phenotypic, and functional restoration of the macrophage compartment after adult colonization.
- Late colonization influences immune responses, potentially leading to attenuated inflammation and desensitization.
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