Department of Surgery, Harvard Medical School and Massachusetts General Hospital, Boston, Massachusetts, United States of America ; Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts, United States of America ; Shriners Hospitals for Children Boston, Boston, Massachusetts, United States of America.
Department of Surgery, Harvard Medical School and Massachusetts General Hospital, Boston, Massachusetts, United States of America ; Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts, United States of America ; Shriners Hospitals for Children Boston, Boston, Massachusetts, United States of America ; IYAR, The Israeli Institute for Advanced Research, Israel ; Institute of Dental Sciences and School of Dental Medicine, Hebrew University, Jerusalem, Israel.
PLoS One. 2013 Dec 19;8(12):e80140. doi: 10.1371/journal.pone.0080140. eCollection 2013.
Bacteria can be refractory to antibiotics due to a sub-population of dormant cells, called persisters that are highly tolerant to antibiotic exposure. The low frequency and transience of the antibiotic tolerant "persister" trait has complicated elucidation of the mechanism that controls antibiotic tolerance. In this study, we show that 2' Amino-acetophenone (2-AA), a poorly studied but diagnostically important small, volatile molecule produced by the recalcitrant gram-negative human pathogen Pseudomonas aeruginosa, promotes antibiotic tolerance in response to quorum-sensing (QS) signaling. Our results show that 2-AA mediated persister cell accumulation occurs via alteration of the expression of genes involved in the translational capacity of the cell, including almost all ribosomal protein genes and other translation-related factors. That 2-AA promotes persisters formation also in other emerging multi-drug resistant pathogens, including the non 2-AA producer Acinetobacter baumannii implies that 2-AA may play an important role in the ability of gram-negative bacteria to tolerate antibiotic treatments in polymicrobial infections. Given that the synthesis, excretion and uptake of QS small molecules is a common hallmark of prokaryotes, together with the fact that the translational machinery is highly conserved, we posit that modulation of the translational capacity of the cell via QS molecules, may be a general, widely distributed mechanism that promotes antibiotic tolerance among prokaryotes.
由于存在一小部分处于休眠状态的细胞,即对抗生素暴露高度耐受的“持久细胞”,细菌可能对抗生素产生抗药性。抗生素耐受的“持久细胞”特性的低频和瞬时性使得控制抗生素耐受的机制的阐明变得复杂。在这项研究中,我们表明,2'-氨基苯乙酮(2-AA)是一种研究甚少但具有诊断意义的小分子,由难以治疗的革兰氏阴性人类病原体铜绿假单胞菌产生,它可促进对抗菌信号(QS)的抗生素耐受。我们的结果表明,2-AA 通过改变参与细胞翻译能力的基因的表达来介导持久细胞的积累,包括几乎所有核糖体蛋白基因和其他翻译相关因子。2-AA 还可促进其他新兴多药耐药病原体(包括非 2-AA 产生菌鲍曼不动杆菌)形成持久细胞,这意味着 2-AA 可能在革兰氏阴性细菌在混合感染中耐受抗生素治疗的能力中发挥重要作用。鉴于合成、排泄和摄取 QS 小分子是原核生物的共同特征,并且翻译机制高度保守,我们假设通过 QS 分子调节细胞的翻译能力可能是一种普遍存在的、广泛分布的机制,可促进原核生物对抗生素的耐受。