在CEFTAZIDIME中低于最低的抑制度会加剧Acinetobacter baumannii生物膜的形成
Bipin Yadav1, Anjali Jaiswal1, Durgesh Kumar1
1Laboratory of Applied Microbiology and Cancer Remedies, School of Life Sciences, Jawaharlal Nehru University, New Delhi, 110067, India.
Microbial pathogenesis
|December 15, 2024
概括
低剂量的抗生素,比如在低于最小的抑制度 (MICs) 的ceftazidime (CAZ),可以意外地促进Acinetobacter baumannii的生长和生物膜的形成,从而促进抗生素耐药性. 这突显了环境抗生素污染的风险.
科学领域:
- 微生物学 微生物学
- 环境科学 环境科学
- 药理学 药理学是指药理学的学科.
背景情况:
- 菌 (Acinetobacter baumannii) 是一种格拉姆阴性菌,经常引起医院感染,特别是在医疗机构内免疫功能低下的人群中.
- 抗生素耐药性在各种环境中,包括废水和自然水体中,因抗生素在低于最低抑制度 (sub-MICs) 的存在而加剧.
- 第三代头素,如ceftazidime (CAZ),在印度通常用于治疗A. baumannii感染.
研究的目的:
- 调查在亚最小抑制度 (亚MIC) 下对A. baumannii KSK1菌株的塞夫塔齐迪姆 (CAZ) 的影响.
- 评估CAZ亚MIC对细菌粘附,生长,形态和生物膜形成的影响.
- 了解环境抗生素污染对抗生素耐药性和细菌持久性的影响.
主要方法:
- 对A. baumannii KSK1菌株在低于最低抑制度 (MIC) 的Ceftazidime (CAZ) 的暴露.
- 对细菌粘附到肺上皮细胞的评估.
- 对细菌生长动力学和形态学的监测.
- 评估细菌聚合物的形成和体外生物膜的形成.
主要成果:
- CAZ亚MICs减少了对肺上皮细胞的初始粘附性,并暂时减缓了A. baumannii KSK1的生长,但细菌最终恢复了生长.
- 暴露于CAZ亚MICs改变了浮游生物A. baumannii KSK1细胞的形态,诱导形成类似生物膜的聚合物.
- 在A. baumannii KSK1.1的体外生物膜形成中,CAZ亚MIC显著增加.
结论:
- 矛盾的是,低于最小的抑制度 (sub-MICs) 的塞夫塔齐 (CAZ) 可以促进A. baumannii的持久性和生物膜的形成,这构成了重大挑战.
- 低于MIC水平的环境抗生素污染,特别是在废水中,可能会导致抗生素耐药菌株的选择和持续存在.
- 这些发现强调需要考虑亚MIC抗生素在临床治疗和环境监测中对抗抗生素耐药性的影响.
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