A novel sensing platform using aptamer and RNA polymerase-based amplification for detection of cancer cells.

Abstract

Cancer is one of the most serious and lethal diseases around the world. Its early detection has become a challenging goal. To address this challenge, we developed a novel sensing platform using aptamer and RNA polymerase-based amplification for the detection of cancer cells. The assay uses the aptamer as a capture probe to recognize and bind the tumor marker on the surface of the cancer cells, forming an aptamer-based sandwich structure for collection of the cells in the microplate wells, and uses SYBR Green II dye as a tracer to produce strong fluorescence signal. The tumor marker interacts first with the recognition probes which were composed of the aptamer and single-stranded T7 RNA polymerase promoter. Then, the recognition probe hybridized with template probes to form a double-stranded T7 RNA polymerase promoter. This dsDNA region is extensively transcribed by T7 RNA polymerase to produce large amounts of RNAs, which are easily monitored using the SYBR Green II dye and a standard fluorometer, resulting in the amplification of the fluorescence signal. Using MCF-7 breast cancer cell as the model cell, the present sensing platform showed a linear range from 5.0×10(2) to 5.0×10(6) cells mL(-1) with a detection limit of 5.0×10(2) cells mL(-1). This work suggested a strategy to use RNA signal amplification combining aptamer recognition to develop a highly sensitive and selective method for cancer cells detection.

• Authors: Jingjin Zhao, Liangliang Zhang, Chunfei Chen, Jianhui Jiang, Ruqin Yu
• Journal: Analytica chimica acta (Anal Chim Acta) Vol. 745 Pg. 106-11 (Oct 01 2012) ISSN: 1873-4324 [Electronic] Netherlands
• PMID: 22938613 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2012 Elsevier B.V. All rights reserved.

Chemical References

• Aptamers, Nucleotide
• Biomarkers, Tumor
• Fluorescent Dyes
• Organic Chemicals
• SYBR Green II
• Viral Proteins
• RNA
• DNA
• bacteriophage T7 RNA polymerase
• DNA-Directed RNA Polymerases

Topics

• Animals
• Aptamers, Nucleotide (chemistry)
• Biomarkers, Tumor (analysis)
• Biosensing Techniques
• CHO Cells
• Cricetinae
• DNA (chemistry)
• DNA-Directed RNA Polymerases (chemistry, metabolism)
• Fluorescent Dyes (chemistry)
• Humans
• Limit of Detection
• MCF-7 Cells
• Neoplasms (chemistry, diagnosis)
• Nucleic Acid Amplification Techniques
• Organic Chemicals (chemistry)
• Promoter Regions, Genetic
• RNA (analysis, chemistry)
• Sensitivity and Specificity
• Viral Proteins (chemistry, metabolism)