Rutgers, The State University of New Jersey

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Versatile Fluorescence Resonance Energy Transfer-Based Mesoporous Silica Nanoparticles for Real-Time Monitoring of Drug Release

Jinping Lai , Birju P. Shah , Eric Garfunkel , and Ki-Bum Lee *

Department of Chemistry and Chemical Biology Institute for Advanced Materials, Devices and Nanotechnology (IAMDN), Rutgers University, Piscataway, New Jersey 08854, United States

*Correspondence to Ki-Bum Lee

Abstract
We describe the development of a versatile fluorescence resonance energy transfer (FRET)-based real-time monitoring system, consisting of (a) coumarin-labeled-cysteine tethered mesoporous silica nanoparticles (MSNs) as the drug carrier, (b) a fluorescein isothiocyanate-β-cyclodextrin (FITC-β-CD) as redox-responsive molecular valve blocking the pores, and (c) a FRET donor-acceptor pair of coumarin and FITC integrated within the pore-unlocking event, thereby allowing for monitoring the release of drugs from the pores in real-time. Under nonreducing conditions, when the disulfide bond is intact, the close proximity between coumarin and FITC on the surface of MSNs results in FRET from coumarin to FITC. However, in the presence of the redox stimuli like glutathione (GSH), the disulfide bond is cleaved which leads to the removal of molecular valve (FITC-β-CD), thus triggering drug release and eliminating FRET. By engineering such a FRET-active donor-acceptor structure within the redox-responsive molecular valve, we can monitor the release of the drugs entrapped within the pores of the MSN nanocarrier, following the change in the FRET signal. We have demonstrated that, any exogenous or endogenous change in the GSH concentration will result in a change in the extent of drug release as well as a concurrent change in the FRET signal, allowing us to extend the applications of our FRET-based MSNs for monitoring the release of any type of drug molecule in real-time.

Keywords: drug delivery; real-time monitoring; fluorescence resonance energy transfer; mesoporous silica nanoparticle (MSN)-based drug delivery; stimuli-responsive

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논문정보   
- 형식: Research article
- 게재일: 2013년 02월 (BRIC 등록일 2013-03-12)
- 연구진: 국외연구진
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