Theranostics:金纳米颗粒可视化检测肝腹水细菌的应用研究获进展

2018-04-11 MedSci 成都生物研究所

由肝腹水引起的细菌性腹膜炎是造成肝硬化病人死亡的重要原因。目前临床上所面临的挑战是如何早期快速发现腹水中的细菌。常规的细菌检测的方法主要是微生物培养或基因分析,然而这些方法需要复杂的设备和专业技术人员的操作。

由肝腹水引起的细菌性腹膜炎是造成肝硬化病人死亡的重要原因。目前临床上所面临的挑战是如何早期快速发现腹水中的细菌。常规的细菌检测的方法主要是微生物培养或基因分析,然而这些方法需要复杂的设备和专业技术人员的操作。

肽聚糖(Peptidoglycan, PG)是细菌细胞壁的主要成分。研究证明,由于细菌D, D-转肽酶选择性比较差,多数细菌容易从周围介质中利用外源性D-氨基酸,通过置换肽中起肽聚糖层连接作用的肽桥上的寡肽链的末端D-丙氨酸而进入其肽聚糖里。D-丙氨酰-D-丙氨酸(D-alanyl-D-alanine,DADA)是肽聚糖寡肽的尾端,相似的分子可能容易被转肽酶识别,从而能使外源性DADA更容易嵌入肽聚糖中。

中国科学院成都生物研究所天然药物与临床转化重点实验室研究员邵华武课题组与国家纳米科学中心研究员蒋兴宇课题组合作发展了一种快速可视化检测细菌的金纳米颗粒,并将其用于临床肝腹水样本中细菌的检测。

利用DADA修饰金纳米颗粒(Au_DADA)能够可视化检测出临床肝腹水样本中的细菌,并且Au_DADA具有以下优点:合成简单,通过一锅法在合成金纳米颗粒的过程中可直接将DADA修饰到金纳米颗粒上;稳定性好,在4 ℃下可保存一年以上。因此,这种纳米颗粒是一种有发展前景的生物传感器,有望应用于临床细菌的早期检测。该研究结果在生物医学杂志Theranostics上发表。

原始出处:

Xinglong Yang,et al.D-alanyl-D-alanine-Modified Gold Nanoparticles Form a Broad-Spectrum Sensor for Bacteria.Theranostics.2018; 8(5):1449-1457.

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    2018-12-29 海豹
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