期刊
SMALL
卷 6, 期 15, 页码 1631-1640出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.200902403
关键词
cancer; encapsulation; imaging; nanocomposites; rare earth nanoparticles
类别
资金
- National Science Foundation [0609000]
- Rutgers Aresty Scholarship Program
- National Institutes of Health NIBIB [T32EB005583]
- Rutgers-UMDNJ Biotechnology Training Program [T32GM008339-20]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0609000] Funding Source: National Science Foundation
The use of traditional fluorophores for in vivo imaging applications is limited by poor quantum yield, poor tissue penetration of the excitation light, and excessive tissue autofluorescence, while the use of inorganic fluorescent particles that offer a high quantum yield is frequently limited due to particle toxicity. Rare-earth-doped nanoparticles that utilize near-infrared upconversion overcome the optical limitations of traditional fluorophores, but are not typically suitable for biological application due to their Insolubility in aqueous solution., lack of functional surface groups for conjugation of biomolecules, and potential cytotoxicity. A new approach to establish highly biocompatible and biologically targetable nanoshell complexes of luminescent rare-earth-doped NaY F-4 nanoparticles (REs) excitable with 920-980nm near-infrared light for biomedical imaging applications is reported. The approach involves the encapsulation of NaY F4 nanoparticles (loped with Yb and Er within human serum albumin nanoshells to create water-dispersible, biologically functionalizable composite particles. These particles exhibit narrow size distributions around 200nm and are stable in aqueous solution for over 4 weeks. The albumin shell confers cytoprotection and significantly enhances the biocompatibility of REs even at concentrations above 200 mu g REs mL(-1). Composite particles conjugated with cyclic arginine-glycine-aspartic acid (cRGD) specifically target both human glioblastoma cell lines and melanoma cells expressing alpha(v)beta(3) integrin receptors. These findings highlight the promise of albumin-encapsulated rare-earth nanoparticles for imaging cancer cells in vitro and the potential for targeted imaging of disease sites in vivo.
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