title: An Annexin V-based biosensor for quantitatively detecting early apoptotic cells.
abstract: In this paper, we reported that a novel biosensor was developed to detect early apoptotic cells by the specific interaction between Annexin V and phosphatidylserine based on electrochemical impedance. Annexin V was immobilized on a self-assembled layer of gold nanoparticles, which allowed stable and high loading of Annexin V on the electrode surface, offering the possibility of sensitivity enhancement. Early apoptotic cells showed an increased exposition of phosphatidylserine on the cell membrane caused by physiological and pathological response reaction, leading to a strong interaction between the apoptotic cells and the electrode surface, which could be probed by electrochemical impedance spectroscopy. As examined using a model system of cells integrated by phosphatidylserine-modified liposome and a real one of early apoptotic cell induced by 5-fluorouracil, this biosensor demonstrated the great potential for rapid detection of cell apoptosis and drug screening. The results agreed well with those obtained using fluorescence microscopy and flow cytometry.
authors.affiliation: State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha, PR China.
authors.forename: Chunyi
authors.initials: C
authors.lastname: Tong
authors.forename: Baoxiang
authors.initials: B
authors.lastname: Shi
authors.forename: Xiaojuan
authors.initials: X
authors.lastname: Xiao
authors.forename: Hongdong
authors.initials: H
authors.lastname: Liao
authors.forename: Yuanqing
authors.initials: Y
authors.lastname: Zheng
authors.forename: Guoli
authors.initials: G
authors.lastname: Shen
authors.forename: Dongying
authors.initials: D
authors.lastname: Tang
authors.forename: Xuanming
authors.initials: X
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D017304:Annexin A5 / Q000737:chemistry*; D000970:Antineoplastic Agents / Q000008:administration & dosage; D017209:Apoptosis / Q000187:drug effects* / Q000502:physiology*; D015374:Biosensing Techniques / Q000295:instrumentation*; D004563:Electrochemistry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005472:Fluorouracil / Q000008:administration & dosage*; D006801:Humans; D019169:Jurkat Cells; D008839:Microelectrodes; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D017304:Annexin A5; D000970:Antineoplastic Agents; D005472:Fluorouracil