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J Med Microbiol 57 (2008), 100-105; DOI: 10.1099/jmm.0.47403-0
© 2008 Society for General Microbiology
ISSN 1473-5644

Oral administration of a catalase-producing Lactococcus lactis can prevent a chemically induced colon cancer in mice

Alejandra de Moreno de LeBlanc1,{dagger}, Jean Guy LeBlanc1,{dagger}, Gabriela Perdigón1,2, Anderson Miyoshi3, Philippe Langella4, Vasco Azevedo3 and Fernando Sesma1

1 Centro de Referencias para Lactobacilos (CERELA), Chacabuco 145, T4000ILC San Miguel de Tucumán, Argentina

2 Cátedra de Inmunología, Instituto de Microbiología, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Argentina

3 Institute of Biological Sciences, Federal University of Minas Gerais (UFMG-ICB), Belo Horizonte, Minas Gerais, Brazil

4 Unite d'Ecologie et de Physiologie Digestive, Institut National de la Recherche Agronomique, Domaine de Vilvert, 78352 Jouy-en-Josas cedex, France

Correspondence
Alejandra de Moreno de LeBlanc
demoreno{at}cerela.org.ar

Received 17 May 2007
Accepted 19 September 2007

Reactive oxygen species, such as hydrogen peroxide (H2O2), are involved in various aspects of tumour development. Decreasing their levels can therefore be a promising approach for colon cancer prevention. The objective of this study was to evaluate the effect of catalase-producing Lactococcus lactis on the prevention of an experimental murine 1,2-dimethylhydrazine (DMH)-induced colon cancer. DMH-treated BALB/c mice received either a catalase-producing L. lactis strain or the isogenic non-catalase-producing strain as a control, whereas other untreated mice did not receive bacterial supplementation. Catalase activity and H2O2 levels in intestinal fluids and blood samples were measured, and changes in the histology of the large intestines during tumour progression were evaluated. The catalase-producing L. lactis strain used in this study was able to slightly increase catalase activities in DMH-treated mice (1.19±0.08 U ml–1) and reduce H2O2 levels (3.4±1.1 µM) compared to (i) animals that received the non-catalase-producing strain (1.00±0.09 U ml–1, 9.0±0.8 µM), and (ii) those that did not receive bacterial supplementation (1.06±0.07 U ml–1, 10.0±1.1 µM). Using the histopathological grading scale of chemically induced colorectal cancer, animals that received the catalase-producing L. lactis had a significantly lesser extent of colonic damage and inflammation (2.0±0.4) compared to animals that received the non-catalase-producing L. lactis (4.0±0.3) or those that did not receive bacterial supplementation (4.7±0.5). The catalase-producing L. lactis strain used in this study was able to prevent tumour appearance in an experimental DMH-induced colon cancer model.

Abbreviations: DMH, 1,2-dimethylhydrazine; LAB, lactic acid bacteria; ROS, reactive oxygen species.

{dagger}These authors contributed equally to this work.






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