Abstract |
We demonstrate bifunctional combined Au-Fe(2)O(3) nanoparticles (NPs) for selectively induction of apoptosis in cancer cells and real-time imaging. The as-prepared Au-Fe(2)O(3) NPs combine the merits of both Au and γ-Fe(2)O(3) NPs, maintaining excellent fluorescence quenching property and catalytic activity. Conjugated with α(Ⅴ)β(3) integrin-targeting peptide (RGD) and fluorescein isothiocyanate ( FITC)-labeled capsase-3 recognition sequence (DEVD) on the Au surface, the resulting RGD/ FITC-DEVD-Au-Fe(2)O(3) NPs bind preferentially to integrin α(Ⅴ)β(3)-rich human liver cancer cells (HepG2), sequentially initiate catalytic formation of hydroxyl radicals (·OH) and enable the real-time monitoring of·OH-induced caspase-3-dependent apoptosis in these cancer cells. Furthermore, the catalytic activity of RGD/ FITC-DEVD-Au-Fe(2)O(3) NPs is much higher than that of individual γ-Fe(2)O(3) NPs due to the polarization effect at the Au-Fe(2)O(3) interface. Such bifunctional Au-Fe(2)O(3) NPs exhibit simultaneous targeting, therapeutic and imaging functions and are therefore promising for future therapeutic applications in cancer.
|
Authors | Wen Gao, Lifei Ji, Lu Li, Guanwei Cui, Kehua Xu, Ping Li, Bo Tang |
Journal | Biomaterials
(Biomaterials)
Vol. 33
Issue 14
Pg. 3710-8
(May 2012)
ISSN: 1878-5905 [Electronic] Netherlands |
PMID | 22342711
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
|
Copyright | Copyright © 2012 Elsevier Ltd. All rights reserved. |
Chemical References |
- Magnetite Nanoparticles
- Superoxides
- Gold
|
Topics |
- Apoptosis
- Computer Systems
- Gold
(therapeutic use)
- Hep G2 Cells
- Humans
- Liver Neoplasms
(metabolism, pathology, therapy)
- Magnetite Nanoparticles
(therapeutic use)
- Materials Testing
- Metal Nanoparticles
(therapeutic use)
- Microscopy, Electron, Transmission
- Superoxides
(metabolism)
|