Volume 53, Issue 4 pp. 1012-1016
Communication

Near-Infrared Light-Mediated Photoactivation of a Platinum Antitumor Prodrug and Simultaneous Cellular Apoptosis Imaging by Upconversion-Luminescent Nanoparticles

Yuanzeng Min

Yuanzeng Min

Division of Chemistry and Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371 (Singapore)

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Jinming Li

Jinming Li

Division of Chemistry and Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371 (Singapore)

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Fang Liu

Fang Liu

Division of Chemistry and Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371 (Singapore)

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Prof. Edwin K. L. Yeow

Corresponding Author

Prof. Edwin K. L. Yeow

Division of Chemistry and Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371 (Singapore)

Division of Chemistry and Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371 (Singapore)Search for more papers by this author
Prof. Bengang Xing

Corresponding Author

Prof. Bengang Xing

Division of Chemistry and Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371 (Singapore)

Division of Chemistry and Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371 (Singapore)Search for more papers by this author
First published: 06 December 2013
Citations: 271

This work was supported by a Start-Up Grant, A*Star (grant number SERC1121202008), MOE, Tier 1 (grant number RG 64/10), and a COS research collaboration award to the Nanyang Technological University, Singapore.

Graphical Abstract

Platinum-based drugs: Near-infrared (NIR) light illumination of conjugates made of photoactive platinum(IV) prodrugs and upconversion-luminescent nanoparticles (UCNPs) is used for the remotely controlled activation of antitumor effects and for simultaneous initiation of apoptosis in the targeted tumor cells. The apoptosis-dependent caspase-3 enzyme offers the promising possibility of imaging apoptosis in real time.

Abstract

Platinum-based drugs are among the most active antitumor reagents in clinical practice; their application is limited by side effects and drug resistance. A novel and personalized near-infrared (NIR) light-activated nanoplatform is obtained by combining a photoactivatable platinum(IV) prodrug and a caspase imaging peptide conjugated with silica-coated upconversion-luminescent nanoparticles (UCNPs) for the remote control of antitumor platinum prodrug activation, and simultaneously for real-time imaging of apoptosis induced by activated cytotoxicity. Upon NIR light illumination, the PtIV prodrug complex is activated at the surface of the nanoparticle and active components are selectively released which display cytotoxicity against human ovarian carcinoma A2780 cells and its cisplatin-resistant variant A2780cis cells. More importantly, the caspases enzymes triggered by cytotoxicity would effectively cleave the probe peptide, thereby allowing the direct imaging of apoptosis in living cells.

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