Subinhibitory concentrations of nisin enhance virulence gene expression in Staphylococcus aureus and increase mortality in Galleria mellonella.
Lett Appl Microbiol
; 77(7)2024 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-38970380
ABSTRACT
Alternative strategies for controlling Staphylococcus aureus and other pathogens have been continuously investigated, with nisin, a bacteriocin widely used in the food industry as a biopreservative, gaining increasing attention. In addition to its antimicrobial properties, bacteriocins have significant effects on genome functionality even at inhibitory concentrations. This study investigated the impact of subinhibitory concentrations of nisin on S. aureus. Culturing in the presence of 0.625 µmol l-1 nisin, led to the increased relative expression of hla, saeR, and sarA, genes associated with virulence while expression of the sea gene, encoding staphylococcal enterotoxin A (SEA), decreased. In an in vivo experiment, Galleria mellonella larvae inoculated with S. aureus cultured in the presence of nisin exhibited 97% mortality at 72 h post-infection, compared to over 40% of larvae mortality in larvae infected with S. aureus. A comprehensive understanding of the effect of nisin on the transcriptional response of virulence genes and the impact of these changes on the virulence of S. aureus can contribute to assessing the application of this bacteriocin in food and medical contexts.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Staphylococcus aureus
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Larva
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Antibacterianos
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Mariposas
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Nisina
Limite:
Animals
Idioma:
En
Revista:
Lett Appl Microbiol
Ano de publicação:
2024
Tipo de documento:
Article