title: TIRF high-content assay development for the evaluation of drug efficacy of chemotherapeutic agents against EGFR-/HER2-positive breast cancer cell lines.
abstract: Elevated expression of epidermal growth factor receptor (EGFR) is reported to be associated with poor prognosis in breast cancer. EGFR subtype identification plays a crucial role in deciding the drug combination to treat the cancer patients. Conventional application of immunohistochemistry (IHC) and fluorescence in situ hybridization (FISH) produces more discordance results in EGFR subtype identification of cancer specimens. The present study is designed to develop an analytical method for simultaneous identification of cell surface biomarkers and quantitative estimation of drug efficacy in cancer specimens. For this study, we have utilized a total internal reflection fluorescence microscope (TIRFM), Qdot molecular probes and chemotherapeutic agent camptothecin (CPT)-treated breast cancer cell lines namely MCF-7, SK-BR-3 and JIMT-1. Highly sensitive detection signals with low background noise generated from the evanescent field excitation of TIRFM make it a highly suitable tool to detect the cell surface biomarkers in living cells. Moreover, single wavelength excitation of Qdot probes offers multicolour imaging with strong emission brightness. In the present study, TIRF high-content imaging system simultaneously showed the expression pattern of EGFRs and EC50 value for CPT-induced apoptosis and necrosis in MCF-7, SK-BR-3 and JIMT-1 cancer cell lines.
authors.affiliation: College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-ku, Seoul, 151-742, Republic of Korea.
authors.forename: Jieun
authors.initials: J
authors.lastname: Ki
authors.affiliation: College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-ku, Seoul, 151-742, Republic of Korea.
authors.forename: Parthasarathy
authors.initials: P
authors.lastname: Arumugam
authors.affiliation: College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-ku, Seoul, 151-742, Republic of Korea. jmsong@snu.ac.kr.
authors.forename: Joon Myong
authors.initials: JM
authors.lastname: Song
mesh_terms: D000970:Antineoplastic Agents / Q000627:therapeutic use*; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D045744:Cell Line, Tumor; D066246:ErbB Receptors / Q000378:metabolism*; D005260:Female; D018734:Genes, erbB-2; D006801:Humans
chemical_list: D000970:Antineoplastic Agents; D066246:ErbB Receptors
keywords: Camptothecin; Epidermal growth factor receptor; Human epidermal receptor-2; Total internal reflection fluorescence microscope