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Milk fermented by Lactobacillus casei CRL431 administered as an immune adjuvant in models of breast cancer and metastasis under chemotherapy

  • Applied microbial and cell physiology
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Abstract

Chemotherapy is the most common treatment for breast cancer and its metastasis; however, it affects the patients’ quality of life. Previously, it was demonstrated that milk fermented by Lactobacillus casei CRL431 (probiotic fermented milk (PFM)) exerted benefits against breast cancer metastasis by modulating the immune response in a mouse model. The aim of this work was to evaluate PFM administration on the side effects of capecitabine and on its anti-tumour/anti-metastatic effects. In vitro, 4T1 breast cancer cells were treated with capecitabine in the presence of immune cells’ conditioned media from mice administered with PFM. Cell viability was evaluated by MTT assay. In vivo, BALB/c mice (healthy, bearing breast cancer or with potential metastasis) were treated or not with capecitabine and administered with PFM. Blood cell counts, intestinal damages, lung histology and serum cytokines were evaluated. Results showed that capecitabine’s toxicity on 4T1 cells was improved by the immune cells from mice that received PFM when the lower dose of capecitabine was evaluated. PFM reduced capecitabine side effects in all the mouse models and decreased intestinal mucositis and mortality. PFM administration to mice under chemotherapy maintained the anti-cancer/anti-metastasis effect of capecitabine with similar or decreased values for serum IL-10 and TNF-α and decreased IL-6, a cytokine related to poor prognosis in advanced cancer patients. In addition, PFM by itself reduced metastasis without side effects and improved the host’s immune response. PFM has a potential to be administered as an immune adjuvant in patients under chemotherapy without affecting the treatment.

Key points

Milk fermented by L. casei CRL431 (PFM) diminished capecitabine side effects.

Capecitabine’s toxicity on 4T1 cells was improved by the PFM-stimulated immune cells.

PFM maintained anti-cancer/anti-metastasis effect of capecitabine in mouse models.

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Funding

This work was financially supported by CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas, project PIP 0697) and ANPCyT (Agencia Nacional de Promoción Científica y Tecnológica, projects 0301and 2554).

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Authors and Affiliations

Authors

Contributions

V.E.M.U. and A.d.M.d.L. planned the research. V.E.M.U., D.P.V. and A.d.M.d.L. conducted the experimental research. V.E.M.U., G.P. and A.d.M.d.L. analysed the data. V.E.M.U and A.d.M.d.L. wrote the manuscript. G.P. made critical revisions of the manuscript. V.E.M.U., G.P. and A.d.M.d.L. approved the final version of the manuscript.

Corresponding author

Correspondence to A. de Moreno de LeBlanc.

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The authors declare no competing financial interests or potential conflicts of interest.

Ethical approval

Animal experiments were approved by the Animal Protection Committee of CERELA and all experiments comply with the current laws of Argentina and international organisations for the use of experimental animals.

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Méndez Utz, V.E., Pérez Visñuk, D., Perdigón, G. et al. Milk fermented by Lactobacillus casei CRL431 administered as an immune adjuvant in models of breast cancer and metastasis under chemotherapy. Appl Microbiol Biotechnol 105, 327–340 (2021). https://doi.org/10.1007/s00253-020-11007-x

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  • DOI: https://doi.org/10.1007/s00253-020-11007-x

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