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Zhang B, Li H, Wang Y, Li Y, Zhou Z, Hou X, Zhang X, Liu T. Mechanism of autophagy mediated by IGF-1 signaling pathway in the neurotoxicity of lead in pubertal rats. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 251:114557. [PMID: 36652739 DOI: 10.1016/j.ecoenv.2023.114557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 01/11/2023] [Accepted: 01/15/2023] [Indexed: 06/17/2023]
Abstract
Lead can damage neuron synapses in the hippocampus and cause synaptic plasticity losses, and learning, memory, and intelligence impairments. Previous studies have focused on the functional and structural plasticity of hippocampal synapses; however, the specific molecular mechanisms behind such impairments are not fully understood. This study aimed to elucidate the molecular mechanisms of cognitive impairment in rats following chronic lead exposure and mitigate or prevent lead toxicity in the central nervous system. We found that lead exposure caused significant damage to rat nervous systems, that is, compared with the control group, the lead treatment group had more autophagosomes in their hippocampal neurons; lower serum and hippocampal IGF-1 levels; lower hippocampal IGF-1, IGF-1R, PI3K, Akt, and mTOR gene expression; and upregulated hippocampal autophagy-associated proteins levels. Brain stereotactic technology was used to conduct autophagy inhibitor in vivo intervention experiments, and the results of these experiments suggest that the autophagy inhibitor DC661 inhibited lead-exposure-induced autophagy and autophagy-related gene expression in the rat hippocampus, possibly through activation of the IGF-1 pathway. Overall, our findings suggest that lead might activate hippocampal autophagy through the IGF-1/PI3K/Akt/mTOR signaling pathway. Therefore, this study provides a novel molecular mechanism underlying developmental toxicity in pubertal rats induced by lead exposure and provides a new target for anticipation and reversal of such neurotoxicity.
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Affiliation(s)
- Bo Zhang
- Department of Pediatric Neurology, First Hospital of Jilin University, Jilin University, Changchun, China
| | - Hang Li
- Department of Hepatobiliary and Pancreas Surgery, China-Japan Union Hospital of Jilin University, Jilin University, Changchun, China
| | - Yan Wang
- Department of Hepatobiliary and Pancreatic Medicine, First Hospital of Jilin University, Jilin University, Changchun, China
| | - Yang Li
- Scientific Research Center, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Zhongsheng Zhou
- Scientific Research Center, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Xuejia Hou
- Scientific Research Center, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Xiaowen Zhang
- Scientific Research Center, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Te Liu
- Scientific Research Center, China-Japan Union Hospital of Jilin University, Changchun, China; Yibin Jilin University Research Institute, Jilin University, Yibin, Sichuan, China.
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Li N, Cui N, Qiao M, Shen Y, Cheng Y, Song L, Huang X, Li L. The effects of lead exposure on the expression of IGF1R, IGFBP3, Aβ40, and Aβ42 in PC12 cells. J Trace Elem Med Biol 2022; 69:126877. [PMID: 34678598 DOI: 10.1016/j.jtemb.2021.126877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 10/13/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND To investigate the effects of lead exposure and IGF1R inhibitor AG1024 on the expression of IGF1R and IGFBP3 in PC12 cells. It is clear that the mechanism of the related proteins inducing AD is regulated by them, thus providing theoretical guidance for the prevention and treatment of lead poisoning. METHODS This study is mainly used PC12 neuron cell to cultivate and establish a corresponding lead exposure model, deal with cells with different concentrations of lead acetate respectively, divide the experiment into control group, 1 μmoL/L PbAc, 10 μmoL/L PbAc group, IGF1R inhibitor (AG1024) group, IGF1R inhibitor group (AG1024) + 1 μmoL/L PbAc group, IGF1R inhibitor group (AG1024) + 10 μmoL/L PbAc group, respective contamination's three periods of time 24 h, 48 h, and 72 h. Lead exposure dose on cell proliferation was examined by MTT. The protein expression of IGF1R and IGFBP3 in PC12 cells were tested by western blotting and immunohistochemistry, The expression of Aβ40 and Aβ42 in cell supernatant was determined by ELISA. RESULTS Compared with the control group, the proliferation of the cells in the high-dose lead-exposed group was significantly inhibited (P < 0.05), and the expression of IGF1R and IGFBP3 was significantly decreased (P < 0.05); the contents of Aβ40 and Aβ42 were not statistically significant among the groups (P > 0.05). CONCLUSION This study shows that lead can obviously down-regulate the expression of IGF1R and IGFBP3, lead and inhibitor can inhibit the proliferation of cells, promote the tendency of apoptosis, and damage the nervous system.
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Affiliation(s)
- Ning Li
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou, 450002, China.
| | - Ningning Cui
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou, 450002, China
| | - Mingwu Qiao
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou, 450002, China
| | - Yue Shen
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou, 450002, China
| | - Yongxia Cheng
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou, 450002, China
| | - Lianjun Song
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou, 450002, China
| | - Xianqing Huang
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou, 450002, China.
| | - Li Li
- College of Food Science and Technology, Henan Agricultural University, Zhengzhou, 450002, China
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Li J, Ma S, Chen J, Hu K, Li Y, Zhang Z, Su Z, Woodgett JR, Li M, Huang Q. GSK-3β Contributes to Parkinsonian Dopaminergic Neuron Death: Evidence From Conditional Knockout Mice and Tideglusib. Front Mol Neurosci 2020; 13:81. [PMID: 32581704 PMCID: PMC7283909 DOI: 10.3389/fnmol.2020.00081] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 04/23/2020] [Indexed: 12/22/2022] Open
Abstract
Glycogen synthase kinase-3 (GSK-3) dysregulation has been implicated in nigral dopaminergic neurodegeneration, one of the main pathological features of Parkinson’s disease (PD). The two isoforms, GSK-3α and GSK-3β, have both been suggested to play a detrimental role in neuronal death. To date, several studies have focused on the role of GSK-3β on PD pathogenesis, while the role of GSK-3α has been largely overlooked. Here, we report in situ observations that both GSK-3α and GSK-3β are dephosphorylated at a negatively acting regulatory serine, indicating kinase activation, selectively in nigral dopaminergic neurons following exposure of mice to 1-methyl-4-pheny-1,2,3,6-tetrahydropyridine (MPTP). To identify whether GSK-3α and GSK-3β display functional redundancy in regulating parkinsonian dopaminergic cell death, we analysed dopaminergic neuron-specific Gsk3a null (Gsk3aΔDat) and Gsk3b null (Gsk3bΔDat) mice, respectively. We found that Gsk3bΔDat, but not Gsk3aΔDat, showed significant resistance to MPTP insult, revealing non-redundancy of GSK-3α and GSK-3β in PD pathogenesis. In addition, we tested the neuroprotective effect of tideglusib, the most clinically advanced inhibitor of GSK-3, in the MPTP model of PD. Administration of higher doses (200 mg/kg and 500 mg/kg) of tideglusib exhibited significant neuroprotection, whereas 50 mg/kg tideglusib failed to prevent dopaminergic neurodegeneration from MPTP toxicity. Administration of 200 mg/kg tideglusib improved motor symptoms of MPTP-treated mice. Together, these data demonstrate GSK-3β and not GSK-3α is critical for parkinsonian neurodegeneration. Our data support the view that GSK-3β acts as a potential therapeutic target in PD and tideglusib would be a candidate drug for PD neuroprotective therapy.
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Affiliation(s)
- Junyu Li
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Shanshan Ma
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | | | - Kunhua Hu
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Yongyi Li
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Zeyu Zhang
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Zixiang Su
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - James R Woodgett
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON, Canada
| | - Mingtao Li
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Qiaoying Huang
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
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Early-life Pb exposure as a potential risk factor for Alzheimer’s disease: are there hazards for the Mexican population? J Biol Inorg Chem 2019; 24:1285-1303. [DOI: 10.1007/s00775-019-01739-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 10/25/2019] [Indexed: 12/30/2022]
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Liu CM, Yang W, Ma JQ, Yang HX, Feng ZJ, Sun JM, Cheng C, Jiang H. Dihydromyricetin Inhibits Lead-Induced Cognitive Impairments and Inflammation by the Adenosine 5'-Monophosphate-Activated Protein Kinase Pathway in Mice. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:7975-7982. [PMID: 29975840 DOI: 10.1021/acs.jafc.8b02433] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Dihydromyricetin (DHM), a natural flavonoid derived from the medicinal and edible plant Ampelopsis grossedentata, exhibits antioxidant, antiapoptosis, antitumor, and anti-inflammatory bioactivities. This study evaluated the effects of DHM on Pb-induced neurotoxicity and explored the underlying mechanisms. DHM significantly ameliorated behavioral impairments of Pb-induced mice. It decreased the levels of lipid peroxidation and protein carbonyl and increased the activities of superoxide dismutase and catalase in the brains. DHM suppressed Pb-induced apoptosis, as indicated by the decreased levels of Bax and cleaved caspase-3. DHM also decreased inflammatory cytokines in the brains of Pb-treated mice. DHM decreased amyloid-beta (Aβ) level and nuclear factor-κB nuclear translocation. Moreover, DHM induced the adenosine 5'-monophosphate-activated protein kinase (AMPK) phosphorylation and inhibited the activation of p38, Toll-like receptor 4, myeloid differentiation factor 88, and glycogen synthase kinase-3. Collectively, this is the first report indicating that DHM could improve Pb-induced cognitive functional impairment by preventing oxidative stress, apoptosis, and inflammation and that the protective effect was mediated partly through the AMPK pathway.
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Affiliation(s)
- Chan-Min Liu
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Wei Yang
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Jie-Qiong Ma
- School of Chemistry and Pharmaceutica Engineering , Sichuan University of Science and Engineering , Xuyuan road , 643000 , Zigong City , Sichuan Province , PR China
| | - Hui-Xin Yang
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Zhao-Jun Feng
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Jian-Mei Sun
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Chao Cheng
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
| | - Hong Jiang
- School of Life Science , Jiangsu Normal University , No.101, Shanghai Road , Tangshan New Area, 221116 , Xuzhou City , Jiangsu Province , PR China
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