Occupational exposure to 1-bromopropane(1-BP) induces learning and memory deficits. However, no therapeutic strategies are currently available. Accumulating evidence has suggested that N-methyl-D-aspartate receptors(N...Occupational exposure to 1-bromopropane(1-BP) induces learning and memory deficits. However, no therapeutic strategies are currently available. Accumulating evidence has suggested that N-methyl-D-aspartate receptors(NMDARs) and neuroinflammation are involved in the cognitive impairments in neurodegenerative diseases. In this study we aimed to investigate whether the noncompetitive NMDAR antagonist MK801 protects against 1-BPinduced cognitive dysfunction. Male Wistar rats were administered with MK801(0.1 mg/kg) prior to 1-BP intoxication(800 mg/kg). Their cognitive performance was evaluated by the Morris water maze test. The brains of rats were dissected for biochemical, neuropathological,and immunological analyses. We found that the spatial learning and memory were significantly impaired in the1-BP group, and this was associated with neurodegeneration in both the hippocampus(especially CA1 and CA3)and cortex. Besides, the protein levels of phosphorylated NMDARs were increased after 1-BP exposure. MK801 ameliorated the 1-BP-induced cognitive impairments and degeneration of neurons in the hippocampus and cortex.Mechanistically, MK801 abrogated the 1-BP-induced disruption of excitatory and inhibitory amino-acid balance and NMDAR abnormalities. Subsequently, MK801 inhibited the microglial activation and release of pro-inflammatory cytokines in 1-BP-treated rats. Our findings, for the first time, revealed that MK801 protected against 1-BP-induced cognitive dysfunction by ameliorating NMDAR function and blocking microglial activation, which might provide a potential target for the treatment of 1-BP poisoning.展开更多
Objective To investigate the changes in mass spectrometryof proteins in patients with 1-bromopropane(1-BP) poisoning after treatment and their biologicalfunctions. Methods From May 2016 to December 2017,3 male patient...Objective To investigate the changes in mass spectrometryof proteins in patients with 1-bromopropane(1-BP) poisoning after treatment and their biologicalfunctions. Methods From May 2016 to December 2017,3 male patients aged 31-47 years with 1-BP poisoning inBao'an District of Shenzhen,China,were enrolled in thisstudy. The whole blood sample (2 ml) was collected beforeand after treatment. Label-free mass spectrometrybasedproteomics was used for protein identification andquantification. The differentially expressed proteins aftertreatment were analyzed. Bioinformatics tools were usedto analyze the functions of the identified proteins and thebiological processes involved in. Results Proteomic analysisshowed that there were 47 proteins that were differentiallyexpressed more than 2-fold ( P < 0. 05) aftertreatment in the patients with 1-BP poisoning;27 wereup-regulated and 20 were down-regulated in the serum oftreated patients.展开更多
Objective This study was mainly focused on study of the proteome profile change between exposure to 1-Bromopropane(1-BP)and 1-BP poisoning.Methods The samples of serums from exposure to 1-BP and 1-BP poisoning were co...Objective This study was mainly focused on study of the proteome profile change between exposure to 1-Bromopropane(1-BP)and 1-BP poisoning.Methods The samples of serums from exposure to 1-BP and 1-BP poisoning were collected and analyzed through Label展开更多
背景:程序性细胞死亡受体1(programmed death receptor-1,PD-1)在高糖环境下影响骨髓间充质干细胞成骨分化的作用机制尚不清楚。目的:探讨高糖环境中PD-1对大鼠骨髓间充质干细胞成骨分化的影响及其调控机制。方法:将大鼠骨髓间充质干细...背景:程序性细胞死亡受体1(programmed death receptor-1,PD-1)在高糖环境下影响骨髓间充质干细胞成骨分化的作用机制尚不清楚。目的:探讨高糖环境中PD-1对大鼠骨髓间充质干细胞成骨分化的影响及其调控机制。方法:将大鼠骨髓间充质干细胞随机分为正常糖组(5.6 mmol/L)、高糖组(30 mmol/L)、PD-1过表达组、PD-1过表达空载组、PD-1敲低组、PD-1敲低空载组、PI3K/AKT通路抑制剂组(PD-1敲低+5μmol/L LY294002)。通过在高糖培养基中培养大鼠骨髓间充质干细胞来模拟体外糖尿病环境,采用qRT-PCR检测大鼠骨髓间充质干细胞中PD-1及其配体PD-L1和成骨标志物Runx2、OSX的mRNA表达,采用碱性磷酸酶染色和茜素红S染色观察成骨分化能力,采用CCK-8检测细胞增殖情况,采用Western blot检测PD-1、PD-L1、p-PI3K、p-AKT的蛋白表达。结果与结论:①高糖组PD-1及PD-L1表达显著高于正常糖组,高糖组骨髓间充质干细胞的成骨分化能力较正常糖组显著下降;②敲低PD-1表达可以促进骨髓间充质干细胞的成骨分化、增加细胞增殖活性,同时激活PI3K/AKT通路;③加入PI3K/AKT通路抑制剂LY294002后,骨髓间充质干细胞成骨分化能力显著下降。结果表明:PD-1依赖于PI3K/AKT信号通路抑制高糖环境下大鼠骨髓间充质干细胞的成骨分化。展开更多
基金supported by the National Natural Science Foundation of China(81872654,81703264)Fundamental Research Funds of Shandong University(2016JC020),ChinaNatural Science Foundation of Shandong Province(ZR2017MH002),China
文摘Occupational exposure to 1-bromopropane(1-BP) induces learning and memory deficits. However, no therapeutic strategies are currently available. Accumulating evidence has suggested that N-methyl-D-aspartate receptors(NMDARs) and neuroinflammation are involved in the cognitive impairments in neurodegenerative diseases. In this study we aimed to investigate whether the noncompetitive NMDAR antagonist MK801 protects against 1-BPinduced cognitive dysfunction. Male Wistar rats were administered with MK801(0.1 mg/kg) prior to 1-BP intoxication(800 mg/kg). Their cognitive performance was evaluated by the Morris water maze test. The brains of rats were dissected for biochemical, neuropathological,and immunological analyses. We found that the spatial learning and memory were significantly impaired in the1-BP group, and this was associated with neurodegeneration in both the hippocampus(especially CA1 and CA3)and cortex. Besides, the protein levels of phosphorylated NMDARs were increased after 1-BP exposure. MK801 ameliorated the 1-BP-induced cognitive impairments and degeneration of neurons in the hippocampus and cortex.Mechanistically, MK801 abrogated the 1-BP-induced disruption of excitatory and inhibitory amino-acid balance and NMDAR abnormalities. Subsequently, MK801 inhibited the microglial activation and release of pro-inflammatory cytokines in 1-BP-treated rats. Our findings, for the first time, revealed that MK801 protected against 1-BP-induced cognitive dysfunction by ameliorating NMDAR function and blocking microglial activation, which might provide a potential target for the treatment of 1-BP poisoning.
文摘Objective To investigate the changes in mass spectrometryof proteins in patients with 1-bromopropane(1-BP) poisoning after treatment and their biologicalfunctions. Methods From May 2016 to December 2017,3 male patients aged 31-47 years with 1-BP poisoning inBao'an District of Shenzhen,China,were enrolled in thisstudy. The whole blood sample (2 ml) was collected beforeand after treatment. Label-free mass spectrometrybasedproteomics was used for protein identification andquantification. The differentially expressed proteins aftertreatment were analyzed. Bioinformatics tools were usedto analyze the functions of the identified proteins and thebiological processes involved in. Results Proteomic analysisshowed that there were 47 proteins that were differentiallyexpressed more than 2-fold ( P < 0. 05) aftertreatment in the patients with 1-BP poisoning;27 wereup-regulated and 20 were down-regulated in the serum oftreated patients.
文摘Objective This study was mainly focused on study of the proteome profile change between exposure to 1-Bromopropane(1-BP)and 1-BP poisoning.Methods The samples of serums from exposure to 1-BP and 1-BP poisoning were collected and analyzed through Label