Please use this identifier to cite or link to this item: https://doi.org/10.1073/pnas.1114551109
Title: Remote activation of biomolecules in deep tissues using near-infrared-to-UV upconversion nanotransducers
Authors: Jayakumar, M.K.G.
Idris, N.M. 
Zhang, Y. 
Keywords: Mesoporous silica
siRNA
Uncaging
Issue Date: 29-May-2012
Source: Jayakumar, M.K.G., Idris, N.M., Zhang, Y. (2012-05-29). Remote activation of biomolecules in deep tissues using near-infrared-to-UV upconversion nanotransducers. Proceedings of the National Academy of Sciences of the United States of America 109 (22) : 8483-8488. ScholarBank@NUS Repository. https://doi.org/10.1073/pnas.1114551109
Abstract: Controlled activation or release of biomolecules is very crucial in various biological applications. Controlling the activity of biomolecules have been attempted by various means and controlling the activity by light has gained popularity in the past decade. The major hurdle in this process is that photoactivable compounds mostly respond to UV radiation and not to visible or near-infrared (NIR) light. The use of UV irradiation is limited by its toxicity and very low tissue penetration power. In this study, we report the exploitation of the potential of NIR-to-UV upconversion nanoparticles (UCNs), which act as nanotransducers to absorb NIR light having high tissue penetration power and negligible phototoxicity and emit UV light locally, for photoactivation of caged compounds and, in particular, used for photo-controlled gene expression. Both activation and knockdown of GFP was performed in both solution and cells, and patterned activation of GFP was achieved successfully by using upconverted UV light produced by NIR-to-UV UCNs. In-depth photoactivation through tissue phantoms and in vivo activation of caged nucleic acids were also accomplished. The success of this methodology has defined a unique level in the field of photo-controlled activation and delivery of molecules.
Source Title: Proceedings of the National Academy of Sciences of the United States of America
URI: http://scholarbank.nus.edu.sg/handle/10635/67256
ISSN: 00278424
DOI: 10.1073/pnas.1114551109
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