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Quantum dot-Aptamer conjugates for synchronous cancer imaging, therapy, and sensing of drug delivery based on Bi-fluorescence resonance energy transfer

Bagalkot, Vaishali and Zhang, Liangfang and Levy-Nissenbaum, Etgar and Jon, Sangyong and Kantoff, Philip W. and Langer, Robert and Farokhzad, Omid C. (2007) Quantum dot-Aptamer conjugates for synchronous cancer imaging, therapy, and sensing of drug delivery based on Bi-fluorescence resonance energy transfer. NANO LETTERS, 7 (10). pp. 3065-3070.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl071546n

Abstract

WWe report a novel quantum dot (QD)−aptamer(Apt)−doxorubicin (Dox) conjugate [QD−Apt(Dox)] as a targeted cancer imaging, therapy, and sensing system. By functionalizing the surface of fluorescent QD with the A10 RNA aptamer, which recognizes the extracellular domain of the prostate specific membrane antigen (PSMA), we developed a targeted QD imaging system (QD−Apt) that is capable of differential uptake and imaging of prostate cancer cells that express the PSMA protein. The intercalation of Dox, a widely used antineoplastic anthracycline drug with fluorescent properties, in the double-stranded stem of the A10 aptamer results in a targeted QD−Apt(Dox) conjugate with reversible self-quenching properties based on a Bi-FRET mechanism. A donor−acceptor model fluorescence resonance energy transfer (FRET) between QD and Dox and a donor−quencher model FRET between Dox and aptamer result when Dox intercalated within the A10 aptamer. This simple multifunctional nanoparticle system can deliver Dox to the targeted prostate cancer cells and sense the delivery of Dox by activating the fluorescence of QD, which concurrently images the cancer cells. We demonstrate the specificity and sensitivity of this nanoparticle conjugate as a cancer imaging, therapy and sensing system in vitro.

Item Type:Article
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Physical Science > Nano objects
Material Science > Nanochemistry
Biomedical Science > Nanomedicine
ID Code:2602
Deposited By:Anuj Seth
Deposited On:27 May 2009 12:11
Last Modified:27 May 2009 12:11

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