title: Highly sensitive electrochemical detection of human telomerase activity based on bio-barcode method.
abstract: In the present study, an electrochemical method for highly sensitive detection of human telomerase activity was developed based on bio-barcode amplification assay. Telomerase was extracted from HeLa cells, then the extract was mixed with telomerase substrate (TS) primer to perform extension reaction. The extension product was hybridized with the capture DNA immobilized on the Au electrode and then reacted with the signal DNA on Au nanoparticles to form a sandwich hybridization mode. Electrochemical signals were generated by chronocoulometric interrogation of [Ru(NH(3))(6)](3+) that quantitatively binds to the DNA on Au nanoparticles via electrostatic interaction. This method can detect the telomerase activity from as little as 10 cultured cancer cells without the polymerase chain reaction (PCR) amplification of telomerase extension product.
authors.affiliation: Key Laboratory of Eco-chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China. liying79307@163.com
authors.forename: Ying
authors.initials: Y
authors.lastname: Li
authors.forename: Bangwei
authors.initials: B
authors.lastname: Liu
authors.forename: Xia
authors.initials: X
authors.lastname: Li
authors.forename: Qingli
authors.initials: Q
authors.lastname: Wei
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D003217:Conductometry / Q000295:instrumentation*; D004247:DNA / Q000737:chemistry*; D001330:Electronic Data Processing; D004789:Enzyme Activation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006367:HeLa Cells; D006801:Humans; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D019098:Telomerase / Q000032:analysis* / Q000737:chemistry*
chemical_list: D004247:DNA; D019098:Telomerase