TY - JOUR
T1 - Suppressing the radiation-induced corrosion of bismuth nanoparticles for enhanced synergistic cancer radiophototherapy
AU - Yan, Liang
AU - Zhou, Ruyi
AU - Liu, Xinxin
AU - Wu, Yuanzheng
AU - Xiang, Huandong
AU - Cao, Jitao
AU - Li, Yinghao
AU - Yin, Wenyan
AU - Zu, Yan
AU - Li, Jinxia
AU - Liu, Ru
AU - Zhao, Feng
AU - Liu, Zhongdong
AU - Chen, Chunying
AU - Gu, Zhanjun
AU - Zhao, Yuliang
N1 - Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/10/27
Y1 - 2020/10/27
N2 - The level of tumor killing by bismuth nanoparticles (BiNPs) as radiosensitizers depends strongly on the powerful particle-matter interaction. However, this same radiation leads to the structural damage in BiNPs, consequently weakening their specific physicochemical properties for radiosensitization. Herein, we studied the radiation-induced corrosion behavior of BiNPs and demonstrated that these damages were manifested by the change in their morphology and crystal structure as well as self-oxidation at their surface. Furthermore, artificial heterostructures were created with graphene nanosheets to greatly suppress the radiation-induced corrosion in BiNPs and enhance their radiocatalytic activity for radiotherapy enhancement. Such a nanocomposite allows the accumulation of overexpressed glutathione, a natural hole scavenger, at the reaction interfaces. This enables the rapid removal of radiogenerated holes from the surface of BiNPs and minimizes the self-radiooxidation, therefore resulting in an efficient suppression of radiation corrosion and a decrease of the depletion of reactive oxygen species (ROS). Meanwhile, the radioexcited conduction band electrons react with the high-level H2O2 within cancer cells to yield more ROS, and the secondary electrons are trapped by H2O molecules to produce hydrated electrons capable of reducing a highly oxidized species such as cytochrome c. These radiochemical reactions together with hyperthermia can regulate the tumor microenvironment and accelerate the onset of cellular redox disequilibrium, mitochondrial dysfunction, and DNA damage, finally triggering tumor apoptosis and death. The current work will shed light on radiosensitizers with an enhanced corrosion resistance for controllable and synergistic radio-phototherapeutics.
AB - The level of tumor killing by bismuth nanoparticles (BiNPs) as radiosensitizers depends strongly on the powerful particle-matter interaction. However, this same radiation leads to the structural damage in BiNPs, consequently weakening their specific physicochemical properties for radiosensitization. Herein, we studied the radiation-induced corrosion behavior of BiNPs and demonstrated that these damages were manifested by the change in their morphology and crystal structure as well as self-oxidation at their surface. Furthermore, artificial heterostructures were created with graphene nanosheets to greatly suppress the radiation-induced corrosion in BiNPs and enhance their radiocatalytic activity for radiotherapy enhancement. Such a nanocomposite allows the accumulation of overexpressed glutathione, a natural hole scavenger, at the reaction interfaces. This enables the rapid removal of radiogenerated holes from the surface of BiNPs and minimizes the self-radiooxidation, therefore resulting in an efficient suppression of radiation corrosion and a decrease of the depletion of reactive oxygen species (ROS). Meanwhile, the radioexcited conduction band electrons react with the high-level H2O2 within cancer cells to yield more ROS, and the secondary electrons are trapped by H2O molecules to produce hydrated electrons capable of reducing a highly oxidized species such as cytochrome c. These radiochemical reactions together with hyperthermia can regulate the tumor microenvironment and accelerate the onset of cellular redox disequilibrium, mitochondrial dysfunction, and DNA damage, finally triggering tumor apoptosis and death. The current work will shed light on radiosensitizers with an enhanced corrosion resistance for controllable and synergistic radio-phototherapeutics.
KW - Hydrated electrons
KW - Nanostructuring
KW - Photothermal therapy
KW - Radiation corrosion behavior
KW - Radiocatalysis
KW - Radiosensitization
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UR - http://www.scopus.com/inward/citedby.url?scp=85094983335&partnerID=8YFLogxK
U2 - 10.1021/acsnano.0c04375
DO - 10.1021/acsnano.0c04375
M3 - Article
C2 - 32898419
AN - SCOPUS:85094983335
SN - 1936-0851
VL - 14
SP - 13016
EP - 13029
JO - ACS Nano
JF - ACS Nano
IS - 10
ER -