甘草甜素
谷胱甘肽
氧化应激
超氧化物歧化酶
活性氧
线粒体
抗氧化剂
线粒体ROS
谷胱甘肽过氧化物酶
化学
细胞生物学
生物化学
生物
药理学
酶
作者
Xin Ru Zhou,Xin Yue Wang,Yue Sun,Chong Zhang,Ke Jian Liu,Fu Yin Zhang,Xiang Bu
标识
DOI:10.1089/ars.2022.0183
摘要
Radiotherapy inevitably causes radiation damage to the salivary glands (SGs) in patients with head and neck cancers (HNCs). Excessive reactive oxygen species (ROS) levels and imbalanced mitochondrial homeostasis are serious consequences of ionizing radiation in SGs; however, there are few mitochondria-targeting therapeutic approaches. Glycyrrhizin is the main extract of licorice root and exhibits antioxidant activity to relieve mitochondrial damage in certain oxidative stress conditions. Herein, the effects of glycyrrhizin on irradiated submandibular glands (SMGs) and the related mechanisms were investigated.Glycyrrhizin reduced radiation damage in rat SMGs at both the cell and tissue levels and promoted saliva secretion in irradiated SMGs. Glycyrrhizin significantly downregulated high mobility group box-1 protein (HMGB1) and Toll-like receptor 5 (TLR5). Moreover, glycyrrhizin significantly suppressed the increases in malondialdehyde and glutathione disulfide (GSSG) levels; elevated the activity of some critical antioxidants, including superoxide dismutase, catalase, glutathione peroxidase and glutathione (GSH); and increased the GSH/GSSG ratio in irradiated cells. Importantly, glycyrrhizin effectively enhanced thioredoxin-2 levels and scavenged mitochondrial ROS, inhibited the decline in mitochondrial membrane potential, improved ATP synthesis, preserved the mitochondrial ultrastructure, activated the PGC-1α/NRF1/2/TFAM signaling pathway, and inhibited mitochondria-related apoptosis in irradiated SMG cells and tissues.Radiotherapy causes radiation sialadenitis in HNC patients. Our data suggest that glycyrrhizin could be a mitochondria-targeted antioxidant for the prevention of radiation damage in SGs.These findings demonstrate that glycyrrhizin protects SMGs from radiation damage by downregulating HMGB1/TLR5 signaling, maintaining intracellular redox balance, eliminating mitochondrial ROS, preserving mitochondrial homeostasis, and inhibiting apoptosis.
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