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Erschienen in: Supportive Care in Cancer 6/2015

01.06.2015 | Original Article

Substantial decreases in the number and diversity of microbiota during chemotherapy-induced gastrointestinal mucositis in a rat model

verfasst von: Margot Fijlstra, Mithila Ferdous, Anne M. Koning, Edmond H. H. M. Rings, Hermie J. M. Harmsen, Wim J. E. Tissing

Erschienen in: Supportive Care in Cancer | Ausgabe 6/2015

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Abstract

Purpose

Earlier, we showed in acute myeloid leukemia (AML) patients that the microbiota changes dramatically during anticancer treatment, coinciding with gastrointestinal mucositis: The commensal anaerobic populations reduce in favor of potential pathogens. Therefore, interventions targeting the microbiota during mucositis might be interesting but can better be tested in animals than in vulnerable mucositis patients. Here, we aimed to study the potential microbial changes during methotrexate (MTX)-induced gastrointestinal mucositis in a well-established rat model and to study whether this model can be used for future microbial intervention studies.

Methods

After injection with MTX or saline (day 0), rats were sacrificed between days 2 and 11. Plasma citrulline level, jejunal histology, and the number and diversity of intestinal bacteria in feces (using fluorescence in situ hybridization (FISH)) were determined.

Results

Mucositis was most severe on day 4 when food intake, plasma citrulline, and villus length were the lowest, compared with controls (P < 0.0125). At the same time, MTX-treated rats showed an overall decrease (705-fold) in most bacteria (using a universal probe), compared with controls (P < 0.125). Reduced bacterial presence was related with the presence of diarrhea and a reduced villus length (rho = 0.38, P < 0.05). At day 4, there was an absolute and relative decrease of anaerobes (13-fold and −58 %, respectively) and streptococci (296-fold and −1 %, respectively) but a relative increase of Bacteroides (+49 %), compared with controls (P < 0.125).

Conclusions

In the mucositis rat model, we found substantial decreases in the number and diversity of microbiota, resembling earlier findings in humans. The model therefore seems well suited to study the effects of different microbial interventions on mucositis, prior to performing human studies.
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Metadaten
Titel
Substantial decreases in the number and diversity of microbiota during chemotherapy-induced gastrointestinal mucositis in a rat model
verfasst von
Margot Fijlstra
Mithila Ferdous
Anne M. Koning
Edmond H. H. M. Rings
Hermie J. M. Harmsen
Wim J. E. Tissing
Publikationsdatum
01.06.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
Supportive Care in Cancer / Ausgabe 6/2015
Print ISSN: 0941-4355
Elektronische ISSN: 1433-7339
DOI
https://doi.org/10.1007/s00520-014-2487-6

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