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Provedor de dados:  ArchiMer
País:  France
Título:  Bioprotective Effect of Lactococcus piscium CNCM I-4031 Against Listeria monocytogenes Growth and Virulence
Autores:  Saraoui, Taous
Leroi, Francoise
Chevalier, Frederique
Cappelier, Jean-michel
Passerini, Delphine
Pilet, Marie-france
Data:  2018-07
Ano:  2018
Palavras-chave:  Biopreservation
Lactococcus piscium
Listeria monocytogenes
Cell ratio
Scanning electron microscopy
Resumo:  Listeria monocytogenes is a Gram-positive pathogen occurring in many refrigerated ready-to-eat foods. It is responsible for foodborne listeriosis, a rare but severe disease with a high mortality rate (20–30%). Lactococcus piscium CNCM I-4031 has the capacity to prevent the growth of L. monocytogenes in contaminated peeled and cooked shrimp and in a chemically defined medium using a cell-to-cell contact-dependent mechanism. To characterize this inhibition further, the effect of L. piscium was tested on a collection of 42 L. monocytogenes strains. All strains were inhibited but had different sensitivities. The effect of the initial concentration of the protective and the target bacteria revealed that the inhibition always occurred when L. piscium had reached its maximum population density, whatever the initial concentration of the protective bacteria. Viewed by scanning electron microscopy, L. monocytogenes cell shape and surface appeared modified in co-culture with L. piscium CNCM I-4031. Lastly, L. monocytogenes virulence, evaluated by a plaque-forming assay on the HT-29 cell line, was reduced after cell pre-treatment by the protective bacteria. In conclusion, the bioprotective effect of L. piscium toward L. monocytogenes growth and virulence was demonstrated, and a hypothesis for the inhibition mechanism is put forward.
Tipo:  Text
Idioma:  Inglês

Editor:  Frontiers Media Sa
Formato:  application/pdf
Fonte:  Frontiers In Microbiology (1664-302X) (Frontiers Media Sa), 2018-07 , Vol. 9 , N. 1564 , P. 10p.
Direitos:  2018 Saraoui, Leroi, Chevalier, Cappelier, Passerini and Pilet. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution...


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