Antibiotic failure mediated by a resistant subpopulation in Enterobacter cloacae.

Antibiotic failure mediated by a resistant subpopulation in Enterobacter cloacae.
复制标题

肠杆菌中抗性亚群介导的抗生素衰竭。

DOI:
10.1038/nmicrobiol.2016.53
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发表时间:
2016-05-09
影响因子:
28.3
通讯作者:
Weiss, David S.
Weiss, David S.
中科院分区:
生物学1区
文献类型:
--
作者:
Band, Victor I.;Crispell, Emily K.;Napier, Brooke A.;Herrera, Carmen M.;Tharp, Greg K.;Vavikolanu, Kranthi;Pohl, Jan;Read, Timothy D.;Bosinger, Steven E.;Trent, M. Stephen;Burd, Eileen M.;Weiss, David S.

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Antibiotic resistance is a major public health threat, further complicated by unexplained treatment failures caused by bacteria that appear antibiotic susceptible. We describe an Enterobacter cloacae isolate harbouring a minor subpopulation that is highly resistant to the last-line antibiotic colistin. This subpopulation was distinct from persisters, became predominant in colistin, returned to baseline after colistin removal and was dependent on the histidine kinase PhoQ. During murine infection, but in the absence of colistin, innate immune defences led to an increased frequency of the resistant subpopulation, leading to inefficacy of subsequent colistin therapy. An isolate with a lower-frequency colistin-resistant subpopulation similarly caused treatment failure but was misclassified as susceptible by current diagnostics once cultured outside the host. These data demonstrate the ability of low-frequency bacterial subpopulations to contribute to clinically relevant antibiotic resistance, elucidating an enigmatic cause of antibiotic treatment failure and highlighting the critical need for more sensitive diagnostics.
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