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Jang YJ, Choi MG, Yoo BJ, Lee KJ, Jung WB, Kim SG, Park SA. Interaction Between a High-Fat Diet and Tau Pathology in Mice: Implications for Alzheimer's Disease. J Alzheimers Dis 2024; 97:485-506. [PMID: 38108353 DOI: 10.3233/jad-230927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
BACKGROUND Obesity is a modifiable risk factor for Alzheimer's disease (AD). However, its relation with tau pathology (i.e., aberrant tau protein behavior in tauopathies such as AD) has been inconclusive. OBJECTIVE This study investigated the interaction between a high-fat diet (HFD) and tau pathology in adult male mice. METHODS Transgenic mice overexpressing human P301S Tau (those with the pathology) and wild-type (WT) littermates were subjected to behavioral tests, functional magnetic resonance imaging (fMRI), diffusion tensor imaging (DTI), and western blotting analysis to investigate the effects of prolonged HFD versus regular diet during adulthood. RESULTS HFD increased body weight in both WT and P301S mice but had minimal effect on blood glucose levels. The brain response to HFD was tau genotype-specific. WT mice exhibited decreased recognition memory and enhanced network connectivity in fMRI, while P301S mice exhibited white matter tract disorganization in DTI as the sole significant finding. The reduction of insulin receptor β, insulin downstream signaling, neuronal nuclear protein, CD68-positive phagocytic activity, and myelin basic protein level were confined to the cortex of WT mice. In contrast to P301S mice, WT mice showed significant changes in the tau protein and its phosphorylation levels along with increased soluble neurofilament light levels in the hippocampus. CONCLUSIONS HFD-induced brain dysfunction and pathological changes were blunted in mice with the pathology and more profound in healthy mice. Our findings highlight the need to consider this interaction between obesity and tau pathology when tailoring treatment strategies for AD and other tauopathies.
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Affiliation(s)
- Yu Jung Jang
- Lab for Neurodegenerative Dementia, Department of Anatomy, Ajou University School of Medicine, Suwon, Republic of Korea
- Neuroscience Graduate Program, Department of Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Min Gyu Choi
- Lab for Neurodegenerative Dementia, Department of Anatomy, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Byung Jae Yoo
- Lab for Neurodegenerative Dementia, Department of Anatomy, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Kyeong Jae Lee
- Lab for Neurodegenerative Dementia, Department of Anatomy, Ajou University School of Medicine, Suwon, Republic of Korea
- Neuroscience Graduate Program, Department of Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Won Beom Jung
- Center for Neuroscience Imaging Research (CNIR), Institute for Basic Science (IBS), Suwon, Republic of Korea
| | - Seong-Gi Kim
- Center for Neuroscience Imaging Research (CNIR), Institute for Basic Science (IBS), Suwon, Republic of Korea
- Department of Biomedical Engineering, Sungkyunkwan University, Suwon, Republic of Korea
| | - Sun Ah Park
- Lab for Neurodegenerative Dementia, Department of Anatomy, Ajou University School of Medicine, Suwon, Republic of Korea
- Neuroscience Graduate Program, Department of Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
- Department of Neurology, Ajou University School of Medicine, Suwon, Republic of Korea
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Moreira PI. Rosalind Franklin Society Proudly Announces the 2022 Award Recipient for Antioxidants & Redox Signaling. Antioxid Redox Signal 2023; 39:1. [PMID: 37459563 DOI: 10.1089/ars.2023.29202.rfs2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Affiliation(s)
- Paula I Moreira
- University of Coimbra, Faculty of Medicine, Coimbra, Portugal
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Zhang S, Fu W, Jia X, Bade R, Liu X, Xie Y, Xie W, Jiang S, Shao G. Hypoxic Preconditioning Modulates BDNF and Its Signaling through DNA Methylation to Promote Learning and Memory in Mice. ACS Chem Neurosci 2023; 14:2320-2332. [PMID: 37289948 PMCID: PMC10289091 DOI: 10.1021/acschemneuro.3c00069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 05/25/2023] [Indexed: 06/10/2023] Open
Abstract
Hypoxic preconditioning (HPC) as an endogenous mechanism can resist hypoxia/ischemia injury and exhibit protective effects on neurological function including learning and memory. Although underlying molecular mechanisms remain unclear, HPC probably regulates the expression of protective molecules by modulating DNA methylation. Brain-derived neurotrophic factor (BDNF) activates its signaling upon binding to the tropomyosin-related kinase B (TrkB) receptor, which is involved in neuronal growth, differentiation, and synaptic plasticity. Therefore, this study focused on the mechanism by which HPC regulates BDNF and BDNF/TrkB signaling through DNA methylation to influence learning and memory. Initially, the HPC model was established by hypoxia stimulations on ICR mice. We found that HPC downregulated the expression of DNA methyltransferase (DNMT) 3A and DNMT3B. Then, the upregulation of BDNF expression in HPC mice was generated from a decrease in DNA methylation of the BDNF gene promoter detected by pyrophosphate sequencing. Subsequently, upregulation of BDNF activated BDNF/TrkB signaling and ultimately improved learning and spatial memory in HPC mice. Moreover, after mice were intracerebroventricularly injected with the DNMT inhibitor, the restraint of DNA methylation accompanied by an increase of BDNF and BDNF/TrkB signaling was also discovered. Finally, we observed that the inhibitor of BDNF/TrkB signaling prevented HPC from ameliorating learning and memory in mice. However, the DNMT inhibitor promoted spatial cognition in mice. Thus, we suggest that HPC may upregulate BDNF by inhibiting DNMTs and decreasing DNA methylation of the BDNF gene and then activate BDNF/TrkB signaling to improve learning and memory in mice. This may provide theoretical guidance for the clinical treatment of cognitive dysfunction caused by ischemia/hypoxia disease.
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Affiliation(s)
- Shiji Zhang
- Inner
Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou 014060, China
| | - Weng Fu
- Inner
Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou 014060, China
| | - Xiaoe Jia
- Inner
Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou 014060, China
- School
of Basic Medicine and Forensic Sciences, Baotou Medical College, Baotou 014060, China
| | - Rengui Bade
- Inner
Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou 014060, China
- School
of Medical Technology and Anesthesia, Baotou Medical College of Neuroscience
Institute, Baotou Medical College, Baotou 014060, China
| | - Xiaolei Liu
- Inner
Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou 014060, China
| | - Yabin Xie
- Inner
Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou 014060, China
- School
of Medical Technology and Anesthesia, Baotou Medical College of Neuroscience
Institute, Baotou Medical College, Baotou 014060, China
| | - Wei Xie
- Inner
Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou 014060, China
- School
of Medical Technology and Anesthesia, Baotou Medical College of Neuroscience
Institute, Baotou Medical College, Baotou 014060, China
| | - Shuyuan Jiang
- Inner
Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou 014060, China
| | - Guo Shao
- Inner
Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou 014060, China
- Center
for Translational Medicine and Department of Laboratory Medicine, The Third People’s Hospital of Longgang District, Shenzhen 518112, China
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Carvalho C, Moreira PI. Metabolic defects shared by Alzheimer's disease and diabetes: A focus on mitochondria. Curr Opin Neurobiol 2023; 79:102694. [PMID: 36842275 DOI: 10.1016/j.conb.2023.102694] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 01/18/2023] [Accepted: 01/24/2023] [Indexed: 02/26/2023]
Abstract
Type 2 diabetes (T2D) and Alzheimer's disease (AD) are two global epidemics that share several metabolic defects, such as insulin resistance, impaired glucose metabolism, and mitochondrial defects. Importantly, strong evidence demonstrates that T2D significantly increases the risk of cognitive decline and dementia, particularly AD. Here, we provide an overview of the metabolic defects that characterize and link both pathologies putting the focus on mitochondria. The biomarker potential of mitochondrial components and the therapeutic potential of some drugs that target and modulate mitochondria are also briefly discussed.
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Affiliation(s)
- Cristina Carvalho
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal; CIBB - Center for Innovation in Biomedicine and Biotechnology, University of Coimbra, Coimbra, Portugal; IIIUC - Institute for Interdisciplinary Research, University of Coimbra, Coimbra, Portugal.
| | - Paula I Moreira
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal; CIBB - Center for Innovation in Biomedicine and Biotechnology, University of Coimbra, Coimbra, Portugal; Institute of Physiology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal.
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Chen J, Xiao F, Chen L, Zhou Z, Wei Y, Zhong Y, Li L, Xie Y. Role of ferroptosis in hypoxic preconditioning to reduce propofol neurotoxicity. Front Pharmacol 2023; 14:1121280. [PMID: 36817119 PMCID: PMC9932196 DOI: 10.3389/fphar.2023.1121280] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Accepted: 01/23/2023] [Indexed: 02/05/2023] Open
Abstract
Background: An increasing number of studies have reported that neurotoxicity of propofol may cause long-term learning and cognitive dysfunction. Hypoxic preconditioning has been shown to have neuroprotective effects, reducing the neurotoxicity of propofol. Ferroptosis is a new form of death that is different from apoptosis, necrosis, autophagy and pyroptosis. However, it is unclear whether hypoxic preconditioning reduces propofol neurotoxicity associated with ferroptosis. Thus, we aimed to evaluate the effect of propofol on primary hippocampal neurons in vitro to investigate the neuroprotective mechanism of hypoxic preconditioning and the role of ferroptosis in the reduction of propofol neurotoxicity by hypoxic preconditioning. Methods: Primary hippocampal neurons were cultured for 8 days in vitro and pretreated with or without propofol, hypoxic preconditioning, agonists or inhibitors of ferroptosis. Cell counting kit-8, Calcein AM, Reactive oxygen species (ROS), Superoxide dismutase (SOD), Ferrous iron (Fe2+), Malondialdehyde (MDA) and Mitochondrial membrane potential assay kit with JC-1 (JC-1) assays were used to measure cell viability, Reactive oxygen species level, Superoxide dismutase content, Fe2+ level, MDA content, and mitochondrial membrane potential. Cell apoptosis was evaluated using flow cytometry analyses, and ferroptosis-related proteins were determined by Western blot analysis. Results: Propofol had neurotoxic effects that led to decreased hippocampal neuronal viability, reduced mitochondrial membrane potential, decreased SOD content, increased ROS level, increased Fe2+ level, increased MDA content, increased neuronal apoptosis, altered expression of ferroptosis-related proteins and activation of ferroptosis. However, hypoxic preconditioning reversed these effects, inhibited ferroptosis caused by propofol and reduced the neurotoxicity of propofol. Conclusion: The neurotoxicity of propofol in developing rats may be related to ferroptosis. Propofol may induce neurotoxicity by activating ferroptosis, while hypoxic preconditioning may reduce the neurotoxicity of propofol by inhibiting ferroptosis.
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Affiliation(s)
- Jing Chen
- Department of Anesthesiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Fei Xiao
- Department of Anesthesiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Lifei Chen
- Department of Anesthesiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Zhan Zhou
- Department of Anesthesiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Yi Wei
- Department of Anesthesiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Yu Zhong
- Department of Anesthesiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Li Li
- Department of Anesthesiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China,*Correspondence: Yubo Xie, ; Li Li,
| | - Yubo Xie
- Department of Anesthesiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China,Guangxi Key Laboratory of Enhanced Recovery After Surgery for Gastrointestinal Cancer, The First Affiliated Hospital of Guangxi Medical University, Nanning, China,*Correspondence: Yubo Xie, ; Li Li,
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Shi W, Tan C, Liu C, Chen D. Mitochondrial fission mediated by Drp1-Fis1 pathway and neurodegenerative diseases. Rev Neurosci 2022; 34:275-294. [PMID: 36059131 DOI: 10.1515/revneuro-2022-0056] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 07/08/2022] [Indexed: 11/15/2022]
Abstract
In recent years, the role of mitochondrial dynamics in neurodegenerative diseases has becoming increasingly important. More and more evidences have shown that in pathological conditions, abnormal mitochondrial divisions, especially Drp1-Fis1-mediated divisions, play an important role in the occurrence and development of Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, Huntington's disease, glaucoma, and other neurodegenerative diseases. This review highlights several new mechanisms of physiological fission of mitochondria and the difference/connection of physiological/pathological mitochondrial fission. In addition, we described the relationship between abnormal mitochondrial dynamics and neurodegenerative diseases in detail and emphatically summarized its detection indicators in basic experiments, trying to provide references for further mechanism exploration and therapeutic targets.
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Affiliation(s)
- Wenjia Shi
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha 410013, Hunan Province, China
| | - Cheng Tan
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha 410013, Hunan Province, China
| | - Can Liu
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha 410013, Hunan Province, China
| | - Dan Chen
- Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha 410013, Hunan Province, China
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