Influence of storage temperature on gene expression and virulence potential of Listeria monocytogenes strains grown in a salmon matrix.

International audience Little is understood about the impact of environmental conditions on the virulence plasticity of Listeria monocytogenes strains grown in food. In this report, we monitored changes in the virulence properties of one high virulent (CCUG 3998) and one low virulent (442) L. monocy...

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Bibliographic Details
Published in:Food Microbiology
Main Authors: Duodu, Samuel, Holst-Jensen, Arne, Skjerdal, Taran, Cappelier, Jean-Michel, Pilet, Marie-France, M.-F., Loncarevic, Semir
Other Authors: National Veterinary Institute, SECurité des ALIments et Microbiologie (SECALIM), Institut National de la Recherche Agronomique (INRA)-École nationale d'ingénieurs des techniques des industries agricoles et alimentaires (ENITIAA)-École nationale vétérinaire, agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2010
Subjects:
Listeria monocytogenes
Gene expression
Salmon
Storage
Virulence
[SDV]Life Sciences [q-bio]
Salmo salar
Online Access:https://hal.inrae.fr/hal-02658831
https://doi.org/10.1016/j.fm.2010.04.012
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Summary:International audience Little is understood about the impact of environmental conditions on the virulence plasticity of Listeria monocytogenes strains grown in food. In this report, we monitored changes in the virulence properties of one high virulent (CCUG 3998) and one low virulent (442) L. monocytogenes strains grown on raw salmon (Salmo salar L.). The effect of temperature exposures (0 degrees C, 4 degrees C and 20 degrees C) on the expression levels of virulence genes (hlyA, actA, inlA and prfA), invasion into Caco-2 cells and in vivo mouse infection was analysed. Our results showed that L. monocytogenes virulence genes are differentially expressed when salmon is stored at different temperatures. Of the four virulence genes, the transcript levels for inlA were strongly affected, which correlated with the strain's virulence capacity as assessed by Caco-2 cells. In contrast to CCUG 3998, the virulence of strain 442 was altered with tested conditions. This strain maintains its low virulence status as far as salmon is stored at lower temperatures, but increases its virulence at higher temperatures. These results lead to the indication that exposure to abuse temperature conditions might influence the virulence potential of low pathogenic L. monocytogenes strains in salmon.

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