Pulse Dosing of Antibiotic Enhances Killing of a Staphylococcus aureus Biofilm.

Pulse Dosing of Antibiotic Enhances Killing of a Staphylococcus aureus Biofilm.
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抗生素的脉冲剂量增强了金黄色葡萄球菌生物膜的杀死。

DOI:
10.3389/fmicb.2020.596227
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发表时间:
2020
影响因子:
5.2
通讯作者:
Lewis K
Lewis K
中科院分区:
生物学2区
文献类型:
--
作者:
Meyer KJ;Taylor HB;Seidel J;Gates MF;Lewis K

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生物膜对抗生素具有高度的耐受性,是许多慢性感染顽固性的基础。我们证明,成熟的金黄色葡萄球菌生物膜可以通过脉冲剂量的抗生素-在这种情况下,苯唑西林-治疗实质上敏感。将脉冲(周期)给药与连续应用抗生素进行了比较,并在一种新的体外流动系统中进行了研究,该系统允许生物膜生长强劲,给药方案的药代动力学容易控制。我们的结果突出了生物膜的一个亚群在抗生素中幸存下来而不会产生耐药性,我们称之为持久细菌。当苯唑西林持续存在时,持久性水平并没有下降,但重要的是,提供正确的定时周期性休息可以减少存活人口。我们发现周期性中断的长度影响疗效,并且存在一个最佳长度,使生物膜敏化重复治疗,而不允许耐药性扩大。定期给药为复杂问题提供了一种潜在的简单解决方案。
Biofilms are highly tolerant to antibiotics and underlie the recalcitrance of many chronic infections. We demonstrate that mature Staphylococcus aureus biofilms can be substantially sensitized to the treatment by pulse dosing of an antibiotic – in this case, oxacillin. Pulse (periodic) dosing was compared to continuous application of antibiotic and was studied in a novel in vitro flow system which allowed for robust biofilm growth and tractable pharmacokinetics of dosing regimens. Our results highlight that a subpopulation of the biofilm survives antibiotic without becoming resistant, a population we refer to as persister bacteria. When oxacillin was continuously present the persister level did not decline, but, importantly, providing correctly timed periodic breaks decreased the surviving population. We found that the length of the periodic break impacted efficacy, and there was an optimal length that sensitized the biofilm to repeat treatment without allowing resistance expansion. Periodic dosing provides a potential simple solution to a complicated problem.
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