Isolation of circulating tumor cells by dielectrophoresis.

Isolation of circulating tumor cells by dielectrophoresis.
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通过电介型分离循环肿瘤细胞。

DOI:
10.3390/cancers6010545
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发表时间:
2014-03-12
期刊:
影响因子:
5.2
通讯作者:
Shim S
Shim S
中科院分区:
医学2区
文献类型:
--
作者:
Gascoyne PR;Shim S

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介电电泳 (DEP) 是一种动电方法,可利用悬浮细胞的固有介电特性进行区分和分离。它已成为从血液中分离循环肿瘤细胞(CTC)的一种有前途的方法。 CTC 的 DEP 分离独立于细胞表面标记。此外,分离的 CTC 是可行的,并且可以在培养物中维持,这表明 DEP 方法应该比基于抗体的方法更普遍适用。本文的目的是为对 CTC 分离感兴趣的肿瘤学家和生物医学工程师回顾和综合 DEP 和 CTC 的相关特征。目的是促进对实现基于 DEP 的仪器所涉及因素的理解,该仪器具有足够的辨别力和通量,以便在临床实践中对 CTC 进行常规分析。本文汇集了:(a) DEP 的原则; (b) CTC 和血细胞介电差异的生物学基础; (c) 为什么预计所有类型的肿瘤都会存在这种差异; (d) 仪器要求在 1 小时内处理 10 mL 血液样本,以实现常规临床分析。介电泳场流分级 (DEP-FFF) 的力平衡方法比早期的 DEP 捕获方法具有更高的辨别力和通量,并且适用于临床研究。
Dielectrophoresis (DEP) is an electrokinetic method that allows intrinsic dielectric properties of suspended cells to be exploited for discrimination and separation. It has emerged as a promising method for isolating circulation tumor cells (CTCs) from blood. DEP-isolation of CTCs is independent of cell surface markers. Furthermore, isolated CTCs are viable and can be maintained in culture, suggesting that DEP methods should be more generally applicable than antibody-based approaches. The aim of this article is to review and synthesize for both oncologists and biomedical engineers interested in CTC isolation the pertinent characteristics of DEP and CTCs. The aim is to promote an understanding of the factors involved in realizing DEP-based instruments having both sufficient discrimination and throughput to allow routine analysis of CTCs in clinical practice. The article brings together: (a) the principles of DEP; (b) the biological basis for the dielectric differences between CTCs and blood cells; (c) why such differences are expected to be present for all types of tumors; and (d) instrumentation requirements to process 10 mL blood specimens in less than 1 h to enable routine clinical analysis. The force equilibrium method of dielectrophoretic field-flow fractionation (DEP-FFF) is shown to offer higher discrimination and throughput than earlier DEP trapping methods and to be applicable to clinical studies.
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