Development of Cell-Based Sentinels for Nitric Oxide: Ensuring Marker Expression and Unimodality.

Development of Cell-Based Sentinels for Nitric Oxide: Ensuring Marker Expression and Unimodality.
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基于细胞的一氧化氮哨兵的开发:确保标记表达和单峰性。

DOI:
10.1021/acssynbio.8b00146
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发表时间:
2018
影响因子:
4.7
通讯作者:
Bentley,WilliamE
Bentley,WilliamE
中科院分区:
生物学2区
文献类型:
--
作者:
McKay,Ryan;Hauk,Pricila;Quan,David;Bentley,WilliamE

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我们产生了“哨兵”细菌,响应生物标志物一氧化氮(NO),并产生均匀和强烈的荧光反应。我们的双质粒系统由一个信号“中继”载体组成,该载体采用一个NO响应启动子,该启动子将天然信号(通过T7聚合酶(T7Pol)的表达)放大到负责GFP表达的第二载体。重要的是,为了实现最佳的“哨兵”应答,我们开发了通过改变T7Pol的(i)翻译和(ii)活性来平衡细胞内转录负荷的策略。然后,我们优化的遗传电路被用于转化大肠杆菌Nissle,作为概念验证,用于克罗恩病(CD)的可摄入的基于细胞的传感器,反过来,其特征是肠道NO水平升高。因此,这里展示的“生物传感器”可以作为一种简单的诊断工具,与包括结肠镜检查或活检在内的护理标准形成对比。
We generated “sentinel” bacteria that respond to the biomarker nitric oxide (NO) and produce a homogeneous and strong fluorescent response. Our dual-plasmid system consists of a signal “relay” vector that employs an NO-responsive promoter that amplifies the native signal (via expression of T7 Polymerase (T7Pol)) to a second vector responsible for GFP expression. Importantly, to achieve an optimal “sentinel” response, we developed strategies that balance the transcriptional load within cells by altering (i) translation and (ii) activity of the T7Pol. Our optimized genetic circuitry was then used to transform commensalE. coliNissle, as a proof-of-concept toward an ingestible cell-based sensor for Crohn’s disease (CD) that, in turn, is marked by elevated levels of intestinal NO. Thus, the “biosensors” demonstrated here may serve as a simple diagnostic tool, contrasting the standard of care including colonoscopies or biopsies.
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