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Published in: Journal of Gastroenterology 9/2016

01-09-2016 | Original Article—Alimentary Tract

RETRACTED ARTICLE: Lactobacillus casei BL23 regulates Treg and Th17 T-cell populations and reduces DMH-associated colorectal cancer

Authors: Marion Lenoir, Silvina del Carmen, Naima G. Cortes-Perez, Daniel Lozano-Ojalvo, Diego Muñoz-Provencio, Florian Chain, Philippe Langella, Alejandra de Moreno de LeBlanc, Jean Guy LeBlanc, Luis G. Bermúdez-Humarán

Published in: Journal of Gastroenterology | Issue 9/2016

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Abstract

Background

Chronic intestinal inflammation alters host physiology and could lead to colorectal cancer (CRC). We have previously reported beneficial effects of the probiotic strain of Lactobacillus casei BL23 in different murine models of intestinal inflammation. In addition, there is an emerging interest on the potential beneficial effects of probiotics to treat CRC. We thus explored whether L. casei BL23 displays protective effects on CRC.

Methods

Mice were subcutaneously injected with 1,2-dimethylhydrazine (DMH) weekly during 10 weeks and orally administered with L. casei BL23 in the drinking water until the 10th week. Multiple plaque lesions in the large intestine were observed macroscopically and counted and intestinal tissues were also histologically analyzed. Finally, T-cell populations and cytokine production were evaluated after co-incubation of L. casei BL23 with spleen cells from non-treated mice to determine the immuno-modulatory effects of this bacterium.

Results

Our results show that oral treatment with this probiotic bacterium modulates host immune responses and significantly protect mice against DMH-induced CRC. This protection may be associated with the modulation of regulatory T-cells towards a Th17-biased immune response accompanied by the expression of regulatory cytokines (IL-6, IL-17, IL-10 and TGF-β), as demonstrated in L. casei BL23-treated splenocytes, but also with the colonic expression of IL-22 observed in vivo on L. casei BL23-treated mice; suggesting the induction of a fine-tune Th17-biased response.

Conclusions

Altogether our results reveal the high potential of L. casei BL23 to treat CRC and opens new frontiers for the study of immunomodulatory functions of probiotics.
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Metadata
Title
RETRACTED ARTICLE: Lactobacillus casei BL23 regulates Treg and Th17 T-cell populations and reduces DMH-associated colorectal cancer
Authors
Marion Lenoir
Silvina del Carmen
Naima G. Cortes-Perez
Daniel Lozano-Ojalvo
Diego Muñoz-Provencio
Florian Chain
Philippe Langella
Alejandra de Moreno de LeBlanc
Jean Guy LeBlanc
Luis G. Bermúdez-Humarán
Publication date
01-09-2016
Publisher
Springer Japan
Published in
Journal of Gastroenterology / Issue 9/2016
Print ISSN: 0944-1174
Electronic ISSN: 1435-5922
DOI
https://doi.org/10.1007/s00535-015-1158-9

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