Department of Physical and Analytical Chemistry & Institute of Biotechnology of Asturias, University of Oviedo, c/Julián Clavería 8, 33006 Oviedo, Spain.
Hospital Universitario San Agustín, 33401 Avilés, Spain.
Sensors (Basel). 2021 May 28;21(11):3756. doi: 10.3390/s21113756.
Colorectal cancer (CRC) is the third leading cause of cancer death and the fourth most common cancer in the world. Colonoscopy is the most sensitive test used for detection of CRC; however, their procedure is invasive and expensive for population mass screening. Currently, the fecal occult blood test has been widely used as a screening tool for CRC but displays low specificity. The lack of rapid and simple methods for mass screening makes the early diagnosis and therapy monitoring difficult. Extracellular vesicles (EVs) have emerged as a novel source of biomarkers due to their contents in proteins and miRNAs. Their detection would not require invasive techniques and could be considered as a liquid biopsy. Specifically, it has been demonstrated that the amount of CD147 expressed in circulating EVs is significant higher for CRC cell lines than for normal colon fibroblast cell lines. Moreover, CD147-containing EVs have been used as a biomarker to monitor response to therapy in patients with CRC. Therefore, this antigen could be used as a non-invasive biomarker for the detection and monitoring of CRC in combination with a Point-of-Care platform as, for example, Lateral Flow Immunoassays (LFIAs). Here, we propose the development of a quantitative lateral flow immunoassay test based on the use of magnetic nanoparticles as labels coupled to inductive sensor for the non-invasive detection of CRC by CD147-positive EVs. The results obtained for quantification of CD147 antigen embedded in EVs isolated from plasma sample have demonstrated that this device could be used as a Point-of-Care tool for CRC screening or therapy monitoring thanks to its rapid response and easy operation.
结直肠癌(CRC)是癌症死亡的第三大主要原因,也是世界上第四常见的癌症。结肠镜检查是用于检测 CRC 的最敏感测试;然而,其程序对于人群大规模筛查来说具有侵入性和昂贵。目前,粪便潜血试验已被广泛用作 CRC 的筛查工具,但特异性低。缺乏快速简单的大规模筛查方法使得早期诊断和治疗监测变得困难。由于其内容物中的蛋白质和 miRNAs,细胞外囊泡(EVs)已成为生物标志物的新来源。它们的检测不需要侵入性技术,可以被认为是一种液体活检。具体来说,已经证明循环 EVs 中表达的 CD147 量对于 CRC 细胞系明显高于正常结肠成纤维细胞系。此外,含有 CD147 的 EVs 已被用作监测 CRC 患者对治疗反应的生物标志物。因此,这种抗原可以与即时检测(POC)平台(例如侧向流动免疫测定(LFIAs))结合使用,作为非侵入性生物标志物用于 CRC 的检测和监测。在这里,我们提出了开发一种基于使用磁性纳米颗粒作为标记物并与感应传感器结合的定量侧向流动免疫测定测试,用于通过 CD147 阳性 EVs 进行非侵入性 CRC 检测。从血浆样本中分离出的 EVs 中嵌入的 CD147 抗原的定量结果表明,由于其快速响应和易于操作,该装置可用于 CRC 筛查或治疗监测的 POCT 工具。
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