2 research outputs found
RapidTox Application to Support Evaluation of Chemical Toxicity to Listed Species
Presentation to the Center for Computational Toxicology and Exposure monthly science webinar November 2022
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Multimodal Imaging-Guided Antitumor Photothermal Therapy and Drug Delivery Using Bismuth Selenide Spherical Sponge
Elaborately designed
biocompatible nanoplatforms simultaneously
having diverse therapeutic and imaging functions are highly desired
for biomedical applications. Herein, a Bi<sub>2</sub>Se<sub>3</sub> nanoagent with a special morphology as a nanoscale spherical sponge
(NSS) has been fabricated and investigated <i>in vitro</i> and <i>in vivo</i>. The highly porous NSS exhibits strong,
steady, and broad-band absorbance in the near-infrared range as well
as high efficiency and stability of photothermal conversion, resulting
in high antitumor efficacy for photothermal therapy (PTT). Together
with a high X-ray attenuation coefficient (218% that of the clinically
used iopromide), the NSS shows excellent performance on triple-modal
high-contrast imaging, including X-ray-computed tomography, multispectral
optoacoustic tomography, and infrared thermal imaging. Furthermore,
the high surface area and porous structure impart the NSS a competent
drug loading capability as high as 600% of that on Bi<sub>2</sub>Se<sub>3</sub> nanoplates, showing a bimodal pH/photothermal sensitive drug
release and pronounced synergetic effects of thermo-chemotherapy with
a tumor inhibition ratio even higher than that of PTT alone (∼94.4% <i>vs</i> ∼66.0%). Meanwhile, the NSS is highly biocompatible
with rather low <i>in vitro</i>/<i>in vivo</i> toxicity and high stability, at variance with easily oxidized Bi<sub>2</sub>Se<sub>3</sub> nanoagents reported previously. Such biocompatible
single-component theranostic nanoagents produced by a facile synthesis
and highly integrated multimodal imaging and multiple therapeutic
functions may have substantial potentials for clinical antitumor applications.
This highly porous nanostructure with a large fraction of void space
may allow versatile use of the NSS, for example, in catalysis, gas
sensing, and energy storage, in addition to accommodating drugs and
other biomolecules