Biogenic gas nanostructures as ultrasonic molecular reporters.

Biogenic gas nanostructures as ultrasonic molecular reporters.
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生物气体纳米结构作为超声分子记者。

DOI:
10.1038/nnano.2014.32
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发表时间:
2014-04
影响因子:
38.3
通讯作者:
--
中科院分区:
材料科学1区
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--
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超声波是生物医学中使用最广泛的非侵入性成像方式之一,但由于缺乏合适的纳米尺度分子报告基因,在分子成像中发挥的作用却小得出奇。在这里,我们介绍一类新型超声波报告器,其基于微生物(包括细菌和古细菌)的基因编码气体纳米结构。气体囊泡是充满气体的蛋白质壳隔室,典型宽度为 45-250 nm,长度为 100-600 nm,不含水且可渗透气体。我们表明,气体囊泡产生稳定的超声对比度,很容易在体外和体内检测到,它们的基因编码的物理特性能够实现多种成像模式,并且通过聚集增强对比度允许它们用作分子生物传感器。
Ultrasound is among the most widely used non-invasive imaging modalities in biomedicine, but plays a surprisingly small role in molecular imaging due to a lack of suitable molecular reporters on the nanoscale. Here we introduce a new class of reporters for ultrasound based on genetically encoded gas nanostructures from microorganisms, including bacteria and archaea. Gas vesicles are gas-filled protein-shelled compartments with typical widths of 45–250 nm and lengths of 100–600 nm that exclude water and are permeable to gas. We show that gas vesicles produce stable ultrasound contrast that is readily detected in vitro and in vivo, that their genetically encoded physical properties enable multiple modes of imaging, and that contrast enhancement through aggregation permits their use as molecular biosensors.
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