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Identification and expression of troponin T, a new marker on the surface of cultured tumor endothelial cells by aptamer ligand.

Cancer Med. 2014 Aug;3(4):825-34. doi:10.1002/cam4.260. Epub 2014 May 09
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摘要


The identification of a specific biomarker involves the development of new clinical diagnostic tools, and an in-depth understanding of the disease at the molecular level. When new blood vessels form in tumor cells, endothelial cell production is induced, a process that plays a key role in disease progression and metastasis to distinct organs for solid tumor types. The present study reports on the identification of a new biomarker on primary cultured mouse tumor endothelial cells (mTECs) using our recently developed high-affinity DNA aptamer AraHH001 (Kd = 43 nmol/L) assisted proteomics approach. We applied a strategy involving aptamer-facilitated biomarker discovery. Biotin-tagged AraHH001 was incubated with lysates of mTECs and the aptamer-proteins were then conjugated with streptavidin magnetic beads. Finally, the bound proteins were separated by sodiumdodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) with silver staining. We identified troponin T via matrix assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry, the molecular target of aptamer AraHH001, and its presence was confirmed by measuring mRNA, protein levels, western blot, immunostaining, a gel shift assay of AraHH001 with troponin T. We first report here on the discovery of troponin T on mTECs, a promising and interesting diagnostic tool in the development of antiangiogenic therapy techniques the involves the targeting of the tumor vasculature.

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