ROS-Activated Ratiometric Fluorescent Polymeric Nanoparticles
for Self-Reporting Drug Delivery
Version 2 2018-02-22, 17:03
Version 1 2018-02-21, 17:18
Posted on 2018-02-22 - 17:03
Reactive
oxygen species (ROS)-responsive theranostic nanomedicines have attracted
wide interest in recent years because ROS stress is implicated in
some pathological disorders such as inflammatory diseases and cancers.
In this article, we report a kind of innovative ROS-responsive theranostic
polymeric nanoparticles that are able to load hydrophobic drugs and
to fluorescently self-report the in vitro or intracellular drug release
under ROS triggering. The fluorescent nanoparticles were formed by
amphiphilic block copolymers consisting of a poly(ethylene glycol)
(PEG) segment and an oxidation-responsive hydrophobic block. The copolymers
with different hydrophobic block lengths were synthesized by the atom
transfer radical polymerization of a phenylboronic ester-containing
acrylic monomer with a small fraction of a ROS-activatable 1,8-naphthalimide-based
fluorescent monomer, using PEG–Br as the macroinitiator. The
copolymer nanoparticles were stable in neutral phosphate buffer but
degraded upon H2O2 triggering, with the degradation
rate depending on the hydrophobic block length and the concentration
of H2O2. The degradation of nanoparticles was
accompanied by a colorimetric change of the fluorophore from blue
to green, which affords the nanoparticles the ability to detecting
H2O2 by a ratiometric fluorescent approach.
Moreover, the nanoparticles could encapsulate doxorubicin (DOX) and
the H2O2-triggered DOX release was well associated
with the change in ratiometric fluorescence. Confocal laser scanning
microscope results reveal that the fluorescent nanoparticles were
internalized into A549 cells through the endocytosis pathway. The
ROS-stimulated degradation of the nanoparticles and intracellular
DOX release and the fate of the degraded polymers could be monitored
by ratiometric fluorescent imaging. Finally, the naked nanoparticles
and the degradation products are cytocompatible, whereas the DOX-loaded
ones exhibit concentration-dependent cytotoxicity. Of importance,
the stimulation with exogenous H2O2 or lipopolysaccharide
enhanced obviously the cell-killing capability of the DOX-loaded nanoparticles
because of the ROS-enhanced intracellular DOX release.
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Zhang, Mei; Song, Cheng-Cheng; Su, Shan; Du, Fu-Sheng; Li, Zi-Chen (2018). ROS-Activated Ratiometric Fluorescent Polymeric Nanoparticles
for Self-Reporting Drug Delivery. ACS Publications. Collection. https://doi.org/10.1021/acsami.7b18438
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AUTHORS (5)
MZ
Mei Zhang
CS
Cheng-Cheng Song
SS
Shan Su
FD
Fu-Sheng Du
ZL
Zi-Chen Li
KEYWORDS
Confocal laser scanning microscope resultsintracellular DOX releaseintracellular drug releasecolorimetric changefluorescently self-reportphenylboronic ester-containing acrylic monomeramphiphilic block copolymersphosphate bufferROS-Activated RatiometricROS stressdegradation rateatom transferROS-responsive theranosticPEGdegradation productscopolymer nanoparticlesSelf-Reporting Drug Delivery Reactive oxygen speciesDOX-loaded ones exhibit concentration-dependent cytotoxicity549 cellsH 2 O 2exogenous H 2 O 2block lengthsDOX releaseratiometric fluorescenceDOX-loaded nanoparticlesPolymeric NanoparticlesROS-enhanced intracellular DOX releasecell-killing capabilityendocytosis pathwayblock lengthROS-stimulated degradation