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Yu J. Acute hyper-hypoxia accelerates the development of depression in mice via the IL-6/PGC1α/MFN2 signaling pathway. Open Med (Wars) 2024; 19:20241001. [PMID: 39135980 PMCID: PMC11317639 DOI: 10.1515/med-2024-1001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 06/30/2024] [Accepted: 07/03/2024] [Indexed: 08/15/2024] Open
Abstract
Background Neural cell damage is an important cause of exacerbation of depression symptoms caused by hypoxia, but the mechanism behind it is still unclear. The purpose of this study is to elucidate the role of peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC1α)/mitofusin-2 (MFN2) signaling axis in the development of depression in mice under hypoxia. Methods Male Institute of Cancer Research mice (age, 6 weeks) were assigned to the normal group, chronic unpredictable mild stress group (CUMS group), or CUMS + hyper-hypoxia group (CUMS + H group). Mice in the CUMS and CUMS + H groups were exposed to CUMS for 28 days. Additionally, mice in the CUMS + H group were exposed to acute hyper-hypoxia from Day 21 for 7 days. After a total of 28 days, behavioral experiments were conducted. All mice were anesthetized and sacrificed. Levels of brain tissue interleukin (IL)-6, reactive oxygen species (ROS), adenosine triphosphate (ATP), and serotonin (5-HT) were analyzed. Results As compared to the CUMS group, mice in the CUMS + H group had increased IL-6 and ROS levels, but lower open-field activity, preference for sucrose, hippocampal neuronal membrane potential, ATP, and 5-HT levels, as well as MFN2 and PGC1α levels. Conclusions Acute hyper-hypoxia plays an important role in the development of depression via the IL-6/PGC1α/MFN2 signaling pathway.
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Affiliation(s)
- Jialu Yu
- Department of Anesthesiology, Guizhou Medical University, Guiyang, China
- Department of Clinical Medicine, Guizhou Medical University, 14 Beijing Road, Guiyang550000, China
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Song Y, Cao H, Zuo C, Gu Z, Huang Y, Miao J, Fu Y, Guo Y, Jiang Y, Wang F. Mitochondrial dysfunction: A fatal blow in depression. Biomed Pharmacother 2023; 167:115652. [PMID: 37801903 DOI: 10.1016/j.biopha.2023.115652] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 10/01/2023] [Accepted: 10/03/2023] [Indexed: 10/08/2023] Open
Abstract
Mitochondria maintain the normal physiological function of nerve cells by producing sufficient cellular energy and performing crucial roles in maintaining the metabolic balance through intracellular Ca2+ homeostasis, oxidative stress, and axonal development. Depression is a prevalent psychiatric disorder with an unclear pathophysiology. Damage to the hippocampal neurons is a key component of the plasticity regulation of synapses and plays a critical role in the mechanism of depression. There is evidence suggesting that mitochondrial dysfunction is associated with synaptic impairment. The maintenance of mitochondrial homeostasis includes quantitative maintenance and quality control of mitochondria. Mitochondrial biogenesis produces new and healthy mitochondria, and mitochondrial dynamics cooperates with mitophagy to remove damaged mitochondria. These processes maintain mitochondrial population stability and exert neuroprotective effects against early depression. In contrast, mitochondrial dysfunction is observed in various brain regions of patients with major depressive disorders. The accumulation of defective mitochondria accelerates cellular nerve dysfunction. In addition, impaired mitochondria aggravate alterations in the brain microenvironment, promoting neuroinflammation and energy depletion, thereby exacerbating the development of depression. This review summarizes the influence of mitochondrial dysfunction and the underlying molecular pathways on the pathogenesis of depression. Additionally, we discuss the maintenance of mitochondrial homeostasis as a potential therapeutic strategy for depression.
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Affiliation(s)
- Yu Song
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095 Jiefang Road, Wuhan 430030, Hubei, China
| | - Huan Cao
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095 Jiefang Road, Wuhan 430030, Hubei, China
| | - Chengchao Zuo
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095 Jiefang Road, Wuhan 430030, Hubei, China
| | - Zhongya Gu
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095 Jiefang Road, Wuhan 430030, Hubei, China
| | - Yaqi Huang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095 Jiefang Road, Wuhan 430030, Hubei, China
| | - Jinfeng Miao
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095 Jiefang Road, Wuhan 430030, Hubei, China
| | - Yufeng Fu
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095 Jiefang Road, Wuhan 430030, Hubei, China
| | - Yu Guo
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095 Jiefang Road, Wuhan 430030, Hubei, China
| | - Yongsheng Jiang
- Cancer Center of Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095 Jiefang Road, Wuhan, 430030 Hubei, China.
| | - Furong Wang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095 Jiefang Road, Wuhan 430030, Hubei, China; Key Laboratory of Vascular Aging (HUST), Ministry of Education, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1095 Jiefang Road, Wuhan, 430030 Hubei, China.
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Alcitepe İ, Salcin H, Karatekin İ, Kaymaz BT. HDAC inhibitor Vorinostat and BET inhibitor Plx51107 epigenetic agents' combined treatments exert a therapeutic approach upon acute myeloid leukemia cell model. MEDICAL ONCOLOGY (NORTHWOOD, LONDON, ENGLAND) 2022; 39:257. [PMID: 36224430 DOI: 10.1007/s12032-022-01858-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 09/20/2022] [Indexed: 11/30/2022]
Abstract
The process of cancer initiation and development is regulated via the transcriptional expression of cells going under genomic and epigenetic changes. Targeting epigenetic "readers", i.e., bromodomains (BRD) and post-translational modifications of nucleosomal histone proteins regulate gene expression in both cancerous and healthy cells. In this study, the new epigenetic agent BRD inhibitor PLX51107 and histone deacetylase (HDAC) inhibitor SAHA' s (Vorinostat) single/combined applications' reflections were analyzed in case of cell proliferation, cytotoxicity, apoptosis, cell cycle arrest, and finally target gene expression regulation upon both AML and healthy B-lymphocyte cells; HL60 and NCIBL2171, respectively; in vitro. Since mono treatments of either Vorinostat or Plx51107 regulated cellular responses such as growth, proliferation, apoptosis, and cell cycle arrest of tumor cells; their combination treatments exerted accelerated results. We detected that combined treatment of Plx51107 and Vorinostat strengthened effects detected upon leukemic cells for gaining more sensitization to the agents, decreasing cell proliferation, dramatically inducing apoptosis, and cell cycle arrest; thus regulating target gene expressions. We have shown for the first time that the newly analyzed BRD inhibitor Plx51107 could be a promising therapeutic approach for hematological malignancies and its mono or combined usage might support a rapid transition to clinical trials.
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Affiliation(s)
- İlayda Alcitepe
- Medical Biology Department, Ege University Medical School, Izmir, Turkey
| | - Hilal Salcin
- Basic Oncology Department, Ege University Health Science Institute, Izmir, Turkey
| | - İlknur Karatekin
- Medical Biology Department, Ege University Medical School, Izmir, Turkey
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Chen K, Lu D, Yang X, Zhou R, Lan L, Wu Y, Wang C, Xu X, Jiang MH, Wei M, Feng X. Enhanced hippocampal neurogenesis mediated by PGC-1α-activated OXPHOS after neonatal low-dose Propofol exposure. Front Aging Neurosci 2022; 14:925728. [PMID: 35966788 PMCID: PMC9363786 DOI: 10.3389/fnagi.2022.925728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 06/28/2022] [Indexed: 11/21/2022] Open
Abstract
Background Developing brain is highly plastic and can be easily affected. Growing pediatric usage of anesthetics during painless procedures has raised concerns about the effect of low-dose anesthetics on neurodevelopment. It is urgent to ascertain the neuronal effect of low-dose Propofol, a widely used anesthetic in pediatrics, on developing brains. Methods The behavioral tests after neonatal exposure to low-dose/high-dose Propofol in mice were conducted to clarify the cognitive effect. The nascent cells undergoing proliferation and differentiation stage in the hippocampus and cultured neural stem cells (NSCs) were further identified. In addition, single-nuclei RNA sequencing (snRNA-seq), NSCs bulk RNA-seq, and metabolism trials were performed for pathway investigation. Furthermore, small interfering RNA and stereotactic adenovirus injection were, respectively, used in NSCs and hippocampal to confirm the underlying mechanism. Results Behavioral tests in mice showed enhanced spatial cognitive ability after being exposed to low-dose Propofol. Activated neurogenesis was observed both in hippocampal and cultured NSCs. Moreover, transcriptome analysis of snRNA-seq, bulk RNA-seq, and metabolism trials revealed a significantly enhanced oxidative phosphorylation (OXPHOS) level in NSCs. Furthermore, PGC-1α, a master regulator in mitochondria metabolism, was found upregulated after Propofol exposure both in vivo and in vitro. Importantly, downregulation of PGC-1α remarkably prevented the effects of low-dose Propofol in activating OXPHOS and neurogenesis. Conclusions Taken together, this study demonstrates a novel alteration of mitochondrial function in hippocampal neurogenesis after low-dose Propofol exposure, suggesting the safety, even potentially beneficial effect, of low-dose Propofol in pediatric use.
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Affiliation(s)
- Keyu Chen
- Department of Anesthesiology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
- Key Laboratory for Stem Cells and Tissue Engineering, Center for Stem Cell Biology and Tissue Engineering, Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Dihan Lu
- Department of Anesthesiology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
- Key Laboratory for Stem Cells and Tissue Engineering, Center for Stem Cell Biology and Tissue Engineering, Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Xiaoyu Yang
- Department of Anesthesiology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Rui Zhou
- Department of Hepatobiliary Surgery, Sun Yat-Sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Liangtian Lan
- Department of Anesthesiology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yan Wu
- Department of Anesthesiology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Chen Wang
- Department of Anesthesiology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Xuanxian Xu
- Department of Anesthesiology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Mei Hua Jiang
- Key Laboratory for Stem Cells and Tissue Engineering, Center for Stem Cell Biology and Tissue Engineering, Ministry of Education, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Department of Anatomy, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Guangdong Key Laboratory of Reproductive Medicine, Guangzhou, China
- Program of Stem Cells and Regenerative Medicine, Affiliated Guangzhou Women and Children's Hospital, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Ming Wei
- Department of Anesthesiology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
- Ming Wei
| | - Xia Feng
- Department of Anesthesiology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
- *Correspondence: Xia Feng
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de Oliveira LRS, Machado FSM, Rocha-Dias I, E Magalhães COD, De Sousa RAL, Cassilhas RC. An overview of the molecular and physiological antidepressant mechanisms of physical exercise in animal models of depression. Mol Biol Rep 2022; 49:4965-4975. [PMID: 35092564 DOI: 10.1007/s11033-022-07156-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 01/17/2022] [Indexed: 02/07/2023]
Abstract
BACKGROUND Depression is a global disease that affects the physical and mental health of people of all ages. Non-pharmacological and unconventional methods of treatment, such as regular physical exercise, have been recommended to treat depression. METHODS Here, we briefly review the literature about the physiological and molecular mechanisms of exercise antidepressants in depressive-like behavior in animal models of depression. RESULTS The main hysiological and molecular mechanisms of physical exercise in depression include blood flow changes in several areas of the brain, increase in brain serotonin synthesis, increase in antioxidant enzymes, increase in serum and brain brain-derived neuro factor (BDNF) levels, decrease in cortisol levels and reduced inflammation in peripheral and brain tissues. Physical exercise also leads to increased activation of the phosphatidylinositol-3-kinase (PI3K), PGC-1α/FNDC5/Irisin pathway, BDNF concentrations (serum and cerebral), extracellular signal-regulated kinase and cAMP-response element binding protein (mainly in neurons of the hippocampus and prefrontal cortex), which together contribute to fight or inhibit the development of depression symptoms. These molecular and physiological mechanisms work in synchrony, further enhancing their effects. CONCLUSION Physical exercise can be used as a safe and effective non-pharmacological treatment in depression.
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Affiliation(s)
- Lucas Renan Sena de Oliveira
- Department of Physical Education, Federal University of the Valleys of Jequitinhonha and Mucuri (UFVJM), Rodovia MGT 367 - Km 583, nº 5000, Bairro Alto da Jacuba, Diamantina, MG, CEP 39100-000, Brazil.,Neuroscience and Exercise Study Group (Grupo de Estudos em Neurociências e Exercício - GENE), UFVJM, Diamantina, MG, Brazil.,Multicenter Post Graduation Program in Physiological Sciences (PMPGCF), UFVJM, Brazilian Society of Physiology, Diamantina, MG, Brazil
| | | | - Isabella Rocha-Dias
- Neuroscience and Exercise Study Group (Grupo de Estudos em Neurociências e Exercício - GENE), UFVJM, Diamantina, MG, Brazil.,Multicenter Post Graduation Program in Physiological Sciences (PMPGCF), UFVJM, Brazilian Society of Physiology, Diamantina, MG, Brazil
| | - Caíque Olegário Diniz E Magalhães
- Neuroscience and Exercise Study Group (Grupo de Estudos em Neurociências e Exercício - GENE), UFVJM, Diamantina, MG, Brazil.,Multicenter Post Graduation Program in Physiological Sciences (PMPGCF), UFVJM, Brazilian Society of Physiology, Diamantina, MG, Brazil
| | - Ricardo Augusto Leoni De Sousa
- Neuroscience and Exercise Study Group (Grupo de Estudos em Neurociências e Exercício - GENE), UFVJM, Diamantina, MG, Brazil.,Multicenter Post Graduation Program in Physiological Sciences (PMPGCF), UFVJM, Brazilian Society of Physiology, Diamantina, MG, Brazil
| | - Ricardo Cardoso Cassilhas
- Department of Physical Education, Federal University of the Valleys of Jequitinhonha and Mucuri (UFVJM), Rodovia MGT 367 - Km 583, nº 5000, Bairro Alto da Jacuba, Diamantina, MG, CEP 39100-000, Brazil. .,Neuroscience and Exercise Study Group (Grupo de Estudos em Neurociências e Exercício - GENE), UFVJM, Diamantina, MG, Brazil. .,Multicenter Post Graduation Program in Physiological Sciences (PMPGCF), UFVJM, Brazilian Society of Physiology, Diamantina, MG, Brazil. .,Post Graduation Program in Health Science (PPGCS), UFVJM, Diamantina, MG, Brasil.
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Wang G, Luo P, Zhang S, Huang Q, Zhang S, Zeng Q, Mao J. Screening and Identification of Antidepressant Active Ingredients from Puerariae Radix Extract and Study on Its Mechanism. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:2230195. [PMID: 34539968 PMCID: PMC8445728 DOI: 10.1155/2021/2230195] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 08/12/2021] [Accepted: 08/17/2021] [Indexed: 11/18/2022]
Abstract
Objective. Depression is a common mental disease with long course and high recurrence rate. Previous studies showed that Puerariae Radix and its extracts have powerful antidepressant effects in recent years. The study proposed an integrated strategy, combining network pharmacology and molecular pharmacology experiment to investigate the mechanisms of the antidepressant active ingredients from Puerariae Radix. Methods. TCMSP database, GeneCards database, Venny 2.1, UniProt database, STRING database, Cytoscape 3.7.2, and Metascape database were used to screen the active chemical components, antidepressant-related genes, and core targets, convert the abbreviated gene names in batch, search and predict the interaction between proteins, and construct the PPI network of Puerariae Radix. KEGG pathway and GO biological process enrichment and biological annotation were used to select antidepressant core gene targets. The MTT method was used to detect the effect of puerarin on the damage of PC12 cells induced by corticosterone. The DCFH-DA probe and ROS assay kit were utilized to detect the production of ROS in PC12 cells. PI/Annexin V was used to detect the apoptotic rate of puerarin on PC12 cells. Western blotting was used to verify the regulation of puerarin on the key targets of AKT1, FOS, CASP3, STAT3, and TNF-α in PC12 cells. Results and Conclusion. Eight main active components, 64 potential antidepressant gene targets, and 15 core antidepressant gene targets were obtained. 35 signaling pathways and 52 biological processes related to antidepressant effect of Puerariae Radix were identified. Puerarin was the active ingredient derived from Puerariae Radix which exhibited the antidepression effect by improving the viability of cell, reducing cell apoptosis, regulating ROS production, increasing protein expressions of AKT1 and FOS, and reducing protein expressions of CASP3, STAT3, and TNF-α. The study revealed the pharmacodynamic material basis and possible antidepressant mechanism of Puerariae Radix and provided new theoretical basis and ideas for antidepressant research.
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Affiliation(s)
- Guoze Wang
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 550025, China
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang 550014, China
| | - Peng Luo
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 550025, China
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang 550014, China
| | - Shuai Zhang
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 550025, China
- Department of Interventional Radiology, The Affiliated Cancer Hospital of Guizhou Medical University, Guiyang 550000, China
| | - Qun Huang
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 550025, China
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang 550014, China
| | - Shuling Zhang
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 550025, China
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang 550014, China
| | - Qibing Zeng
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 550025, China
| | - Jingxin Mao
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 550025, China
- College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China
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Głombik K, Budziszewska B, Basta-Kaim A. Mitochondria-targeting therapeutic strategies in the treatment of depression. Mitochondrion 2021; 58:169-178. [PMID: 33766747 DOI: 10.1016/j.mito.2021.03.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 02/26/2021] [Accepted: 03/17/2021] [Indexed: 12/12/2022]
Abstract
Depression is an affective disease with a complex clinical picture that is characterized by mood and emotional disturbances. It is known that several factors contribute to the risk of developing depression. The concept that mitochondrial dysfunction is one of the causes of depression is supported by a wide range of studies on cell cultures, animal models, and clinical research. An understanding the relationship between mitochondrial processes and central nervous system abnormalities that occur in the course of depression can guide the development of novel mitochondrial targeted therapeutic strategies as well as the usage of currently available antidepressants in a new context. This brief review aims to summarize recent findings on mitochondria dysfunction in depression, provide insight into therapeutic strategies targeting mitochondrial pathways, allude to future promising therapies, and discuss factors that can be used to improve treatment outcomes. The main focus is on new aspects (the effects of nutraceuticals and physical activity on brain metabolism), which can be combined with the available treatment options [monoamine oxidase inhibitors (MAOIs), tricyclic antidepressants (TCAs), selective serotonin reuptake inhibitors (SSRIs) and atypical drugs] to enhance their therapeutic effects.
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Affiliation(s)
- Katarzyna Głombik
- Laboratory of Immunoendocrinology, Department of Experimental Neuroendocrinology, Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, Kraków 31-343, Poland.
| | - Bogusława Budziszewska
- Laboratory of Immunoendocrinology, Department of Experimental Neuroendocrinology, Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, Kraków 31-343, Poland
| | - Agnieszka Basta-Kaim
- Laboratory of Immunoendocrinology, Department of Experimental Neuroendocrinology, Maj Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, Kraków 31-343, Poland
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Li YQ, Wong CS. Metabolic Regulation of Hippocampal Neuronal Development and Its Inhibition After Irradiation. J Neuropathol Exp Neurol 2021; 80:467-475. [PMID: 33706379 DOI: 10.1093/jnen/nlab014] [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] [Indexed: 11/14/2022] Open
Abstract
5'-Adenosine monophosphate-activated protein kinase (AMPK), a key regulator of cellular energy homeostasis, plays a role in cell fate determination. Whether AMPK regulates hippocampal neuronal development remains unclear. Hippocampal neurogenesis is abrogated after DNA damage. Here, we asked whether AMPK regulates adult hippocampal neurogenesis and its inhibition following irradiation. Adult Cre-lox mice deficient in AMPK in brain, and wild-type mice were used in a birth-dating study using bromodeoxyuridine to evaluate hippocampal neurogenesis. There was no evidence of AMPK or phospho-AMPK immunoreactivity in hippocampus. Increase in p-AMPK but not AMPK expression was observed in granule neurons and subgranular neuroprogenitor cells (NPCs) in the dentate gyrus within 24 hours and persisted up to 9 weeks after irradiation. AMPK deficiency in Cre-lox mice did not alter neuroblast and newborn neuron numbers but resulted in decreased newborn and proliferating NPCs. Inhibition of neurogenesis was observed after irradiation regardless of genotypes. In Cre-lox mice, there was further loss of newborn early NPCs and neuroblasts but not newborn neurons after irradiation compared with wild-type mice. These results are consistent with differential negative effect of AMPK on hippocampal neuronal development and its inhibition after irradiation.
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Affiliation(s)
- Yu-Qing Li
- From the Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
| | - C Shun Wong
- From the Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
- Departments of Radiation Oncology and Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
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