Chunxia Chen1, Wan Chen2, Zhihuan Nong3, Yichu Nie4, Xiaoyu Chen3, Xiaorong Pan5, Ying Guo6, Meicun Yao7, Wenbin Deng8. 1. Department of Pharmaceutical Sciences (Shenzhen), Sun Yat-Sen University, Guangzhou, Guangdong 510006, PR China; Department of Hyperbaric Oxygen, the People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, PR China. 2. Department of Emergency, the People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, PR China. 3. Department of Pharmacy, the People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, PR China. 4. Department of Pharmaceutical Sciences (Shenzhen), Sun Yat-Sen University, Guangzhou, Guangdong 510006, PR China. 5. Department of Hyperbaric Oxygen, the People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530021, PR China. 6. Department of Pharmaceutical Sciences (Shenzhen), Sun Yat-Sen University, Guangzhou, Guangdong 510006, PR China. Electronic address: guoying1226@hotmail.com. 7. Department of Pharmaceutical Sciences (Shenzhen), Sun Yat-Sen University, Guangzhou, Guangdong 510006, PR China. Electronic address: lssymc@mail.sysu.edu.cn. 8. Department of Pharmaceutical Sciences (Shenzhen), Sun Yat-Sen University, Guangzhou, Guangdong 510006, PR China. Electronic address: dengwb08@163.com.
Abstract
AIMS: In this study, we investigate the effect and underlying mechanism of hyperbaric oxygen (HBO) treatment on a model of repeated cerebral ischemia-reperfusion injury (IR). MAIN METHODS: Eighty rats were randomly separated into sham, vehicle, hyperbaric air (HBA; 0.25 MPa, 60 min), and HBO (0.25 MPa, 60 min) groups. Repeated cerebral IR was induced by ligating the right and left bilateral common carotid arteries for 10 min and then allowing reperfusion for 10 min. This pattern was repeated three times. The neuroprotective effects of HBO were assessed by animal behavior, neuron morphology, inflammatory markers, intracellular calcium ion content, and autophagy-related protein and gene expression. KEY FINDINGS: Our result showed that HBO improved learning and memory in the navigation trail and probe trail of the Morris water maze, and these findings were supported by the observation data from 2,3,5-Triphenyltet-razolium chloride staining, Nissl staining, and electron microscopic. Importantly, we found that HBO reduced excessive autophagy in the prefrontal cortex, which was evidenced by activating of the mammalian target of the rapamycin (mTOR) and 4E-BP1, as well as suppression of LC3II and ATG5. Moreover, HBO significantly inhibited the cerebral IR-induced inflammatory reaction. Furthermore, HBO treatment modulated autophagy pathway-related factors, including producing a decrease in the intracellular calcium ion concentration and p53 level; meanwhile, the levels of BDNF and p-Akt were increased. SIGNIFICANCE: Our results indicated that HBO protected against IR-induced neuron injury by attenuating autophagy, inflammation, and calcium overload. These results provide a new mechanism and laboratory evidence for clinical treatment of VD.
AIMS: In this study, we investigate the effect and underlying mechanism of hyperbaric oxygen (HBO) treatment on a model of repeated cerebral ischemia-reperfusion injury (IR). MAIN METHODS: Eighty rats were randomly separated into sham, vehicle, hyperbaric air (HBA; 0.25 MPa, 60 min), and HBO (0.25 MPa, 60 min) groups. Repeated cerebral IR was induced by ligating the right and left bilateral common carotid arteries for 10 min and then allowing reperfusion for 10 min. This pattern was repeated three times. The neuroprotective effects of HBO were assessed by animal behavior, neuron morphology, inflammatory markers, intracellular calcium ion content, and autophagy-related protein and gene expression. KEY FINDINGS: Our result showed that HBO improved learning and memory in the navigation trail and probe trail of the Morris water maze, and these findings were supported by the observation data from 2,3,5-Triphenyltet-razolium chloride staining, Nissl staining, and electron microscopic. Importantly, we found that HBO reduced excessive autophagy in the prefrontal cortex, which was evidenced by activating of the mammalian target of the rapamycin (mTOR) and 4E-BP1, as well as suppression of LC3II and ATG5. Moreover, HBO significantly inhibited the cerebral IR-induced inflammatory reaction. Furthermore, HBO treatment modulated autophagy pathway-related factors, including producing a decrease in the intracellular calcium ion concentration and p53 level; meanwhile, the levels of BDNF and p-Akt were increased. SIGNIFICANCE: Our results indicated that HBO protected against IR-induced neuron injury by attenuating autophagy, inflammation, and calcium overload. These results provide a new mechanism and laboratory evidence for clinical treatment of VD.
Authors: Amir Ajoolabady; Shuyi Wang; Guido Kroemer; Josef M Penninger; Vladimir N Uversky; Domenico Pratico; Nils Henninger; Russel J Reiter; Askiel Bruno; Kaumudi Joshipura; Hamid Aslkhodapasandhokmabad; Daniel J Klionsky; Jun Ren Journal: Pharmacol Ther Date: 2021-04-03 Impact factor: 13.400
Authors: Joerg Lindenmann; Christian Smolle; Lars-Peter Kamolz; Freyja Maria Smolle-Juettner; Wolfgang F Graier Journal: Int J Mol Sci Date: 2021-10-29 Impact factor: 5.923