Journal
BIOMATERIALS
Volume 33, Issue 10, Pages 3058-3069Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2012.01.003
Keywords
Hybrid nanogels; Poly(vinyl alcohol); Quantum dots; Optical temperature-sensing; Dual-modal imaging; Drug delivery
Funding
- Xiamen University (China)
- NFFTBS (China) [J1030415]
- US Agency for International Development, USA [PGA-P280422]
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The polymer-inorganic hybrid nanogels with temperature-responsive characteristic are of considerable current interest to many fields ranging from fundamental biomaterials science to bionanomedicine. This paper reports the preparation of temperature-responsive hybrid nanogels by immobilization of Bi2O3 quantum dots (QDs) in the interior of a nanogel of poly(vinyl alcohol) (PVA). Unlike conventional temperature-responsive hybrid nanogels with the responsive features deriving from the temperature-responsive polymers (e.g. PNIPAMs or non-linear PEGs), we demonstrate that QDs can work cooperatively with the gel networks of PVA, an unconventional responsive polymer, to enable the temperature-induced volume phase transition of the designed Bi2O3@PVA hybrid nanogels. Building on the rationales, Bi2O3@PVA hybrid nanogels can adapt to a surrounding fluids of different temperatures over the physiologically important range of 37-40 degrees C, convert the disruptions in homeostasis of environmental temperature into high-sensitive fluorescent signals, enter into the mouse melanoma B16F10 cells for dark-field and fluorescence dual-modal imaging, and regulate the release of a model anticancer drug temozolomide. The unconventional strategy that can broaden the design scheme of temperature-responsive hybrid nanogels for theranostic action should enhance our ability to address the complexity of biological systems. (C) 2012 Elsevier Ltd. All rights reserved.
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