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Real-Time Detection of Telomerase Activity in Cancer Cells using a Label-Free Electrochemical Impedimetric Biosensing Microchip

机译:使用无标记电化学阻抗生物传感芯片实时检测癌细胞中的端粒酶活性

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摘要

The enzyme telomerase is present in about 85% of human cancers which makes it not only a good target for cancer treatment but also an excellent marker for cancer detection. Using a single stranded DNA probe specific for telomerase binding and reverse transcription tethered to an interdigital gold electrode array surface, the chromosome protection provided by the telomerase was replicated and followed by Electrochemical Impedance Spectroscopy as an unlabeled biosensor. Using this system designed in-house, easy and affordable, impedance measurements were taken while incubating at 37 °C and promoting the probe elongation. This resulted in up to 14-fold increase in the charge transfer resistance when testing a telomerase-positive nuclear extract from Jurkat cells compared to the heat-inactivated telomerase-negative nuclear extract. The electron transfer process at the Au electrodes was studied before the elongation, at different times after the elongation, and after desorption of non-specific binding.
机译:端粒酶存在于大约85%的人类癌症中,这使其不仅是治疗癌症的好靶标,而且还是检测癌症的极好的标记。使用特异于端粒酶结合和反转录的单链DNA探针,将其连接到叉指式金电极阵列表面,可复制端粒酶提供的染色体保护,然后通过电化学阻抗谱作为未标记的生物传感器。使用此内部设计的系统,简单易行且价格适中,在37°C下孵育并促进探针伸长的同时进行了阻抗测量。与热灭活的端粒酶阴性核提取物相比,当测试来自Jurkat细胞的端粒酶阳性核提取物时,电荷转移阻力提高了14倍。在延伸之前,延伸之后的不同时间以及非特异性结合的解吸之后,研究了Au电极上的电子转移过程。

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