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Multiplexed In Vivo Imaging Using Size-Controlled Quantum Dots in the Second Near-Infrared Window

Title
Multiplexed In Vivo Imaging Using Size-Controlled Quantum Dots in the Second Near-Infrared Window
Authors
정상화Jung, Ye-Bin류연미이수민Kim, Young-EunSong, Jae-Jung김미연김상엽AHN, G ONEKim, Sung-Jee
POSTECH Authors
AHN, G ONEKim, Sung-Jee
Date Issued
19-Dec-2018
Publisher
WILEY
Abstract
PbS/CdS core/shell quantum dots (QDs) that emit at the second near-infrared (NIR-II, 1000-1700 nm) window are synthesized. The PbS seed size and CdS shell thicknesses are carefully controlled to produce bright and narrow fluorescence that are suitable for multiplexing. A polymer encapsulation yields polymer-encapsulated NIR-II QDs (PQDs), which provides the QDs with long-term fluorescence stability over a week in biological media. Exploiting the simple bioconjugation capability of PQDs, folic acids are conjugated to PQDs that can efficiently label folate receptor overexpressing cell lines. The PQDs afford multiplexed and nearly real-time longitudinal whole-body in vivo imaging. Two NIR-II QD probes are prepared: folic acid-conjugated PQDs (FA-PQDs) emitting at 1280 nm and unconjugated PQDs emitting at 1080 nm. The two PQDs are engineered to have compact and similar hydrodynamic sizes. A mixture of the folic acid-conjugated PQD and unconjugated PQDs is injected intravenously into a tumor-xenografted mouse, and the signals from them are monitored. This NIR-II whole-body imaging with the two PQDs provides precise evaluation of the active ligand-assisted tumor-targeting capability of the FA-PQD probe because the hydrodynamic size control of the two PQDs effectively eliminates effects from the size-dependent accumulations by permeations and retentions in tumors.
Keywords
BETA-LACTOGLOBULIN; NANOCRYSTALS; PROBE
URI
http://oasis.postech.ac.kr/handle/2014.oak/94618
DOI
10.1002/adhm.201800695
ISSN
2192-2640
Article Type
Article
Citation
ADVANCED HEALTHCARE MATERIALS, vol. 7, no. 24, 2018-12-19
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 KIM, SUNG JEE
Dept of Chemistry
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