期刊
LETTERS IN APPLIED MICROBIOLOGY
卷 50, 期 2, 页码 223-229出版社
WILEY
DOI: 10.1111/j.1472-765X.2009.02783.x
关键词
agr; alpha-toxin; haemolysis; licochalcone A; Staphylococcus aureus
资金
- National Nature Science Foundation of China [30871889, 30972212]
Aim: To evaluate the effect of subinhibitory concentrations of licochalcone A (LicA) on alpha-toxin secretion in Staphylococcus aureus. Methods and Results: A haemolysin assay was used to investigate the haemolytic activities in culture supernatants of both methicillin-sensitive and methicillin-resistant Staph. aureus isolates cultured with graded subinhibitory concentrations of LicA. Alpha-toxin secretion was detected by immunoblot analysis. Moreover, quantitative RT-PCR was performed to assess the influence of LicA on the transcription of hla (the gene encoding alpha-toxin) and agr (accessory gene regulator). Growth in the presence of LicA markedly inhibited the mRNA levels of hla and agr in Staph. aureus, resulting in a reduction of alpha-toxin secretion and, thus, haemolytic activities. Conclusion: The secretion of alpha-toxin in Staph. aureus is decreased by LicA; this effect may be partially dependent upon inhibition of the Agr two-component system. Significance and Impact of the Study: The findings in our study may support the use of LicA as a lead compound in the design of more potent antibacterial agents that are based on the chalcone template.
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