Interleukin-1β-induced growth enhancement of Staphylococcus aureus occurs in biofilm but not planktonic cultures

被引:40
|
作者
McLaughlin, Renee A. [1 ]
Hoogewerf, Arlene J. [1 ]
机构
[1] Calvin Coll, Dept Biol, Grand Rapids, MI 49546 USA
基金
美国国家科学基金会;
关键词
Staphylococcus aureus; biofilm; interleukin-1; beta; cytokine; flow cytometry;
D O I
10.1016/j.micpath.2006.04.005
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Staphylococcus aureus causes recalcitrant infections and forms resistant biofilms. Mechanisms of biofilm resistance to host defenses may include changes in gene expression that confer responsiveness to chemical mediators. In earlier studies fresh clinical isolates responded to inflammatory cytokines, but responsiveness was lost after multiple in vitro passages [Meduri et al. Cytokines IL-1 beta, IL-6, and TNF-alpha enhance the In vitro growth of bacteria. Am J Respir Crit Care Med 1999; 160:961-7]. Since biofilms more closely resemble in vivo growth and are implicated in recalcitrant infections, we hypothesized that biofilms, but not planktonic cells, would respond to cytokines. Biofilms were induced by ethanol in S. aureus ATCC 12600. Biofilms treated with 2 ng/mL interleukin-1 beta (IL-1 beta) for 6h contained 2.5-fold more cells than untreated biofilms, but no growth-enhancement occurred in planktonic cultures. As determined by flow cytometry, IL-beta bound to 63.1% of biofilm cells, but only 11.2% of planktonic cells. Our results provide evidence of a differential response of biofilm and planktonic bacteria to chemical mediators, and suggest that biofilm bacteria may evade host defenses by growing more rapidly in response to the inflammatory mediators released by activated host defense cells. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:67 / 79
页数:13
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