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He Y, Dong N, Wang X, Lv RJ, Yu Q, Yue HM. Obstructive sleep apnea affects cognition: dual effects of intermittent hypoxia on neurons. Sleep Breath 2024; 28:1051-1065. [PMID: 38308748 DOI: 10.1007/s11325-024-03001-8] [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] [Received: 03/06/2023] [Revised: 01/10/2024] [Accepted: 01/12/2024] [Indexed: 02/05/2024]
Abstract
Obstructive sleep apnea (OSA) is a common respiratory disorder. Multiple organs, especially the central nervous system (CNS), are damaged, and dysfunctional when intermittent hypoxia (IH) occurs during sleep for a long time. The quality of life of individuals with OSA is significantly impacted by cognitive decline, which also escalates the financial strain on their families. Consequently, the development of novel therapies becomes imperative. IH induces oxidative stress, endoplasmic reticulum stress, iron deposition, and neuroinflammation in neurons. Synaptic dysfunction, reactive gliosis, apoptosis, neuroinflammation, and inhibition of neurogenesis can lead to learning and long-term memory impairment. In addition to nerve injury, the role of IH in neuroprotection was also explored. While causing neuron damage, IH activates the neuronal self-repairing mechanism by regulating antioxidant capacity and preventing toxic protein deposition. By stimulating the proliferation and differentiation of neural stem cells (NSCs), IH has the potential to enhance the ratio of neonatal neurons and counteract the decline in neuron numbers. This review emphasizes the perspectives and opportunities for the neuroprotective effects of IH and informs novel insights and therapeutic strategies in OSA.
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Affiliation(s)
- Yao He
- The First Clinical Medical College of Lanzhou University, Lanzhou, China
| | - Na Dong
- The First Clinical Medical College of Lanzhou University, Lanzhou, China
| | - Xiao Wang
- The First Clinical Medical College of Lanzhou University, Lanzhou, China
| | - Ren-Jun Lv
- The First Clinical Medical College of Lanzhou University, Lanzhou, China
| | - Qin Yu
- Department of Respiratory and Critical Care Medicine, The First Hospital of Lanzhou University, Lanzhou, China
| | - Hong-Mei Yue
- Department of Respiratory and Critical Care Medicine, The First Hospital of Lanzhou University, Lanzhou, China.
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Chang Z, Liu Q, Fan P, Xu W, Xie Y, Gong K, Zhang C, Zhao Z, Sun K, Shao G. Hypoxia preconditioning increases Notch1 activity by regulating DNA methylation in vitro and in vivo. Mol Biol Rep 2024; 51:507. [PMID: 38622406 DOI: 10.1007/s11033-024-09308-9] [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: 12/08/2023] [Accepted: 02/01/2024] [Indexed: 04/17/2024]
Abstract
BACKGROUND Our previous research has demonstrated that hypoxic preconditioning (HPC) can improve spatial learning and memory abilities in adult mice. Adult hippocampal neurogenesis has been associated with learning and memory. The Neurogenic locus notch homolog protein (Notch) was involved in adult hippocampal neurogenesis, as well as in learning and memory. It is currently unclear whether the Notch pathway regulates hippocampal neuroregeneration by modifying the DNA methylation status of the Notch gene following HPC. METHOD The HPC animal model and cell model were established through repeated hypoxia exposure using mice and the mouse hippocampal neuronal cell line HT22. Step-down test was conducted on HPC mice. Real-time PCR and Western blot analysis were used to assess the mRNA and protein expression levels of Notch1 and hairy and enhancer of split1 (HES1). The presence of BrdU-positive cells and Notch1 expression in the hippocampal dental gyrus (DG) were examined with confocal microscopy. The methylation status of the Notch1 was analyzed using methylation-specific PCR (MS-PCR). HT22 cells were employed to elucidate the impact of HPC on Notch1 in vitro. RESULTS HPC significantly improved the step-down test performance of mice with elevated levels of mRNA and protein expression of Notch1 and HES1 (P < 0.05). The intensities of the Notch1 signal in the control group, the H group and the HPC group were 2.62 ± 0.57 × 107, 2.87 ± 0.84 × 107, and 3.32 ± 0.14 × 107, respectively, and the number of BrdU (+) cells in the hippocampal DG were 1.83 ± 0.54, 3.71 ± 0.64, and 7.29 ± 0.68 respectively. Compared with that in C and H group, the intensity of the Notch1 signal and the number of BrdU (+) cells increased significantly in HPC group (P < 0.05). The methylation levels of the Notch1 promoter 0.82 ± 0.03, 0.65 ± 0.03, and 0.60 ± 0.02 in the C, H, and HPC groups, respectively. The methylation levels of Notch1 decreased significantly (P < 0.05). The effect of HPC on HT22 cells exhibited similarities to that observed in the hippocampus. CONCLUSION HPC may confer neuroprotection by activating the Notch1 signaling pathway and regulating its methylation level, resulting in the regeneration of hippocampal neurons.
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Affiliation(s)
- Zhehan Chang
- Center for Translational Medicine, The Third People's Hospital of Longgang District, Shenzhen, China
- Inner Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou, China
- Beijing Key Laboratory of Hypoxic Conditioning Translational Medicine, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Qi Liu
- Department of Radiology, The Second Affiliated Hospital of Baotou Medical College, Baotou, China
| | - Peijia Fan
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Wenqiang Xu
- Inner Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou, China
- Beijing Key Laboratory of Hypoxic Conditioning Translational Medicine, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Yabin Xie
- Inner Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou, China
- Beijing Key Laboratory of Hypoxic Conditioning Translational Medicine, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Kerui Gong
- Department of Oral and Maxillofacial Surgery, University of California San Francisco, San Francisco, USA
| | - Chunyang Zhang
- Department of Neurosurgery, The First Affiliated Hospital of Baotou Medical College, Baotou, China
| | - Zhijun Zhao
- Department of Neurosurgery, The First Affiliated Hospital of Baotou Medical College, Baotou, China.
| | - Kai Sun
- Center for Translational Medicine, The Third People's Hospital of Longgang District, Shenzhen, China.
| | - Guo Shao
- Center for Translational Medicine, The Third People's Hospital of Longgang District, Shenzhen, China.
- Inner Mongolia Key Laboratory of Hypoxic Translational Medicine, Baotou Medical College, Baotou, China.
- Beijing Key Laboratory of Hypoxic Conditioning Translational Medicine, Xuanwu Hospital, Capital Medical University, Beijing, China.
- Department of Neurosurgery, The First Affiliated Hospital of Baotou Medical College, Baotou, China.
- Joint Laboratory of South China Hospital Affiliated to Shenzhen University and Third People's Hospital of Longgang District, Shenzhen University, Shenzhen, China.
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3
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Liu Y, Tan J, Miao Y, Zhang Q. Neurogenesis, A Potential Target for Intermittent Hypoxia Leading to Cognitive Decline. Curr Stem Cell Res Ther 2024; 19:63-70. [PMID: 37005547 DOI: 10.2174/1574888x18666230330083206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 01/30/2023] [Accepted: 02/06/2023] [Indexed: 04/04/2023]
Abstract
As a sleep breathing disorder, characterized by intermittent hypoxia (IH) and Obstructive sleep apnea (OSA), is believed to decrease the cognitive function of patients. Many factors are thought to be responsible for cognitive decline in OSA patients. Neurogenesis, a process by which neural stem cells (NSCs) differentiate into new neurons in the brain, is a major determinant affecting cognitive function. However, there is no clear relationship between IH or OSA and neurogenesis. In recent years, increasing numbers of studies on IH and neurogenesis are documented. Therefore, this review summarizes the effects of IH on neurogenesis; then discusses the influencing factors that may cause these effects and the potential signaling pathways that may exist. Finally, based on this impact, we discuss potential methods and future directions for improving cognition.
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Affiliation(s)
- Yuxing Liu
- Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin Geriatrics Institute, Tianjin, China
| | - Jin Tan
- Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin Geriatrics Institute, Tianjin, China
| | - Yuyang Miao
- Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin Geriatrics Institute, Tianjin, China
| | - Qiang Zhang
- Department of Geriatrics, Tianjin Medical University General Hospital, Tianjin Geriatrics Institute, Tianjin, China
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Li G, Guan Y, Gu Y, Guo M, Ma W, Shao Q, Liu J, Ji X. Intermittent hypoxic conditioning restores neurological dysfunction of mice induced by long-term hypoxia. CNS Neurosci Ther 2022; 29:202-215. [PMID: 36401601 PMCID: PMC9804074 DOI: 10.1111/cns.13996] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 09/18/2022] [Accepted: 09/20/2022] [Indexed: 11/21/2022] Open
Abstract
BACKGROUND Central nervous system diseases are associated with hypoxia, which usually cause irreversible nerve damage, but the underlying mechanism is unclear and effective intervention strategies are lacking. This study was designed to explore the mechanism and treatment strategy of hypoxia-induced nerve injury. METHODS In this study, 13% O2 was used to treat mice for 0, 1, 3 7, and 14 days, Morris water maze and other animal behavior experiments were used to evaluate the neurological function of mice. TUNEL, BrdU, PCNA, DCX, and SOX2 staining were used to observe the apoptosis and proliferation of mouse neurons. RT-PCR and Iba1 staining were used to evaluate the release of inflammatory factors IL-1β, IL-6, and TNF-α and the activation of microglia. RESULTS Short-term hypoxia promotes neurogenesis, while long-term hypoxia inhibits neurogenesis. The changes in hypoxia-induced neurogenesis were positively correlated with neurological functions, but negatively correlated with apoptosis. Moreover, intermittent hypoxic conditioning restored long-term hypoxia-induced neurological dysfunction by promoting neural stem cell generation and inhibiting the release of inflammatory factors IL-1β, IL-6, and TNF-α and the activation of microglia. CONCLUSION Hypoxia promoted neurogenesis in a time-dependent manner, and intermittent hypoxic conditioning exerted a neuroprotective effect through promoting neural stem cell generation and suppressing inflammation induced by long-term hypoxia stress, which provided a novel concept to develop a treatment for hypoxia-related brain injury.
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Affiliation(s)
- Gaifen Li
- Beijing Institute of Brain Disorders, Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Advanced Innovation Center for Big Data‐based Precision MedicineCapital Medical UniversityBeijingChina,Department of Neurosurgery, Xuanwu HospitalCapital Medical UniversityBeijingChina
| | - Yuying Guan
- Beijing Institute of Brain Disorders, Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Advanced Innovation Center for Big Data‐based Precision MedicineCapital Medical UniversityBeijingChina,Department of Neurosurgery, Xuanwu HospitalCapital Medical UniversityBeijingChina
| | - Yakun Gu
- Beijing Institute of Brain Disorders, Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Advanced Innovation Center for Big Data‐based Precision MedicineCapital Medical UniversityBeijingChina
| | - Mengyuan Guo
- Beijing Institute of Brain Disorders, Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Advanced Innovation Center for Big Data‐based Precision MedicineCapital Medical UniversityBeijingChina
| | - Wei Ma
- Beijing Institute of Brain Disorders, Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Advanced Innovation Center for Big Data‐based Precision MedicineCapital Medical UniversityBeijingChina
| | - Qianqian Shao
- Beijing Institute of Brain Disorders, Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Advanced Innovation Center for Big Data‐based Precision MedicineCapital Medical UniversityBeijingChina
| | - Jia Liu
- Beijing Institute of Brain Disorders, Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Advanced Innovation Center for Big Data‐based Precision MedicineCapital Medical UniversityBeijingChina
| | - Xunming Ji
- Beijing Institute of Brain Disorders, Laboratory of Brain Disorders, Ministry of Science and Technology, Collaborative Innovation Center for Brain Disorders, Beijing Advanced Innovation Center for Big Data‐based Precision MedicineCapital Medical UniversityBeijingChina,Department of Neurosurgery, Xuanwu HospitalCapital Medical UniversityBeijingChina
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5
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Li G, Liu J, Guan Y, Ji X. The role of hypoxia in stem cell regulation of the central nervous system: From embryonic development to adult proliferation. CNS Neurosci Ther 2021; 27:1446-1457. [PMID: 34817133 PMCID: PMC8611781 DOI: 10.1111/cns.13754] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 09/28/2021] [Accepted: 10/03/2021] [Indexed: 12/12/2022] Open
Abstract
Hypoxia is involved in the regulation of various cell functions in the body, including the regulation of stem cells. The hypoxic microenvironment is indispensable from embryonic development to the regeneration and repair of adult cells. In addition to embryonic stem cells, which need to maintain their self-renewal properties and pluripotency in a hypoxic environment, adult stem cells, including neural stem cells (NSCs), also exist in a hypoxic microenvironment. The subventricular zone (SVZ) and hippocampal dentate gyrus (DG) are the main sites of adult neurogenesis in the brain. Hypoxia can promote the proliferation, migration, and maturation of NSCs in these regions. Also, because most neurons in the brain are non-regenerative, stem cell transplantation is considered as a promising strategy for treating central nervous system (CNS) diseases. Hypoxic treatment also increases the effectiveness of stem cell therapy. In this review, we firstly describe the role of hypoxia in different stem cells, such as embryonic stem cells, NSCs, and induced pluripotent stem cells, and discuss the role of hypoxia-treated stem cells in CNS diseases treatment. Furthermore, we highlight the role and mechanisms of hypoxia in regulating adult neurogenesis in the SVZ and DG and adult proliferation of other cells in the CNS.
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Affiliation(s)
- Gaifen Li
- Laboratory of Brain DisordersMinistry of Science and TechnologyCollaborative Innovation Center for Brain DisordersBeijing Institute of Brain DisordersCapital Medical UniversityBeijingChina
- Department of NeurosurgeryXuanwu HospitalCapital Medical UniversityBeijingChina
| | - Jia Liu
- Laboratory of Brain DisordersMinistry of Science and TechnologyCollaborative Innovation Center for Brain DisordersBeijing Institute of Brain DisordersCapital Medical UniversityBeijingChina
| | - Yuying Guan
- Laboratory of Brain DisordersMinistry of Science and TechnologyCollaborative Innovation Center for Brain DisordersBeijing Institute of Brain DisordersCapital Medical UniversityBeijingChina
- Department of NeurosurgeryXuanwu HospitalCapital Medical UniversityBeijingChina
| | - Xunming Ji
- Laboratory of Brain DisordersMinistry of Science and TechnologyCollaborative Innovation Center for Brain DisordersBeijing Institute of Brain DisordersCapital Medical UniversityBeijingChina
- Department of NeurosurgeryXuanwu HospitalCapital Medical UniversityBeijingChina
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Yue X, Zhou Y, Qiao M, Zhao X, Huang X, Zhao T, Cheng X, Fan M, Zhao Y, Chen R, Zhu L. Intermittent hypoxia treatment alleviates memory impairment in the 6-month-old APPswe/PS1dE9 mice and reduces amyloid beta accumulation and inflammation in the brain. Alzheimers Res Ther 2021; 13:194. [PMID: 34844651 PMCID: PMC8630860 DOI: 10.1186/s13195-021-00935-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Accepted: 11/09/2021] [Indexed: 12/11/2022]
Abstract
Background Alzheimer’s disease (AD) is a progressive, degenerative, and terminal disease without cure. There is an urgent need for a new strategy to treat AD. The aim of this study was to investigate the effects of intermittent hypoxic treatment (IHT) on cognitive functions in a mouse model of AD and unravel the mechanism of action of IHT. Methods Six-month-old APPswe/PS1dE9 (APP/PS1) male mice were exposed to hypoxic environment (14.3% O2) 4 h/day for 14 days or 28 days. Cognitive functions were measured by Morris water maze test after either 14 days or 42 days of interval. Thereafter the distribution of amyloid plaque and microglial activation were determined by mouse brain immunohistochemistry, while the amyloid beta (Aβ) and inflammatory cytokines were measured by ELISA and Western Blot. Microarray was used for studying gene expressions in the hippocampus. Results IHT for 14 days or 28 days significantly improved the spatial memory ability of the 6-month-old APP/PS1 mice. The memory improvement by 14 days IHT lasted to 14 days, but not to 42 days. The level of Aβ plaques and neurofilament accumulations was reduced markedly after the IHT exposure. IHT reduced the pro-inflammatory cytokines IL-1β, IL-6 levels, and β-secretase cleavage of APP processing which implies reduced Aβ production. Microarray analysis revealed a large number of genes in the hippocampus were significantly altered which are known to be metabolism-regulated genes. Conclusions This study provides evidence of the beneficial effect of IHT on the progression of AD by alleviating memory impairment, reducing Aβ accumulation and inflammation in the brain. IHT can be developed as a novel measure to relieve the progression of AD by targeting multiple pathways in the AD pathogenesis. Supplementary Information The online version contains supplementary material available at 10.1186/s13195-021-00935-z.
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Affiliation(s)
- Xiangpei Yue
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Yanzhao Zhou
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Meng Qiao
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Xingnan Zhao
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Xin Huang
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Tong Zhao
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Xiang Cheng
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Ming Fan
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Yongqi Zhao
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Ruoli Chen
- Institute for Science and Technology in Medicine, School of Pharmacy, Keele University, Kelle, UK.
| | - Lingling Zhu
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China. .,Co-innovation Center of Neuroregeneration, Nantong University, Nantong, 226019, China. .,Hengyang Medical School, University of South China, Hengyang, 421001, Hunan, China. .,Anhui Medical University, Hefei, 230022, Anhui, China.
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7
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Intermittent Hypoxia and Effects on Early Learning/Memory: Exploring the Hippocampal Cellular Effects of Pediatric Obstructive Sleep Apnea. Anesth Analg 2021; 133:93-103. [PMID: 33234943 DOI: 10.1213/ane.0000000000005273] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This review provides an update on the neurocognitive phenotype of pediatric obstructive sleep apnea (OSA). Pediatric OSA is associated with neurocognitive deficits involving memory, learning, and executive functioning. Adenotonsillectomy (AT) is presently accepted as the first-line surgical treatment for pediatric OSA, but the executive function deficits do not resolve postsurgery, and the timeline for recovery remains unknown. This finding suggests that pediatric OSA potentially causes irreversible damage to multiple areas of the brain. The focus of this review is the hippocampus, 1 of the 2 major sites of postnatal neurogenesis, where new neurons are formed and integrated into existing circuitry and the mammalian center of learning/memory functions. Here, we review the clinical phenotype of pediatric OSA, and then discuss existing studies of OSA on different cell types in the hippocampus during critical periods of development. This will set the stage for future study using preclinical models to understand the pathogenesis of persistent neurocognitive dysfunction in pediatric OSA.
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8
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Di Fiore JM, Raffay TM. The relationship between intermittent hypoxemia events and neural outcomes in neonates. Exp Neurol 2021; 342:113753. [PMID: 33984336 DOI: 10.1016/j.expneurol.2021.113753] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 04/06/2021] [Accepted: 05/07/2021] [Indexed: 12/20/2022]
Abstract
This brief review examines 1) patterns of intermittent hypoxemia in extremely preterm infants during early postnatal life, 2) the relationship between neonatal intermittent hypoxemia exposure and outcomes in both human and animal models, 3) potential mechanistic pathways, and 4) future alterations in clinical care that may reduce morbidity. Intermittent hypoxemia events are pervasive in extremely preterm infants (<28 weeks gestation at birth) during early postnatal life. An increased frequency of intermittent hypoxemia events has been associated with a range of poor neural outcomes including language and cognitive delays, motor impairment, retinopathy of prematurity, impaired control of breathing, and intraventricular hemorrhage. Neonatal rodent models have shown that exposure to short repetitive cycles of hypoxia induce a pathophysiological cascade. However, not all patterns of intermittent hypoxia are deleterious and some may even improve neurodevelopmental outcomes. Therapeutic interventions include supplemental oxygen, pressure support and pharmacologic drugs but prolonged hyperoxia and pressure exposure have been associated with cardiopulmonary morbidity. Therefore, it becomes imperative to distinguish high risk from neutral and/or even beneficial patterns of intermittent hypoxemia during early postnatal life. Identification of such patterns could improve clinical care with targeted interventions for high-risk patterns and minimal or no exposure to treatment modalities for low-risk patterns.
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Affiliation(s)
- Juliann M Di Fiore
- Division of Neonatology, Rainbow Babies and Children's Hospital, Cleveland, OH, United States of America; Department of Pediatrics, Case Western Reserve University, Cleveland, OH, United States of America.
| | - Thomas M Raffay
- Division of Neonatology, Rainbow Babies and Children's Hospital, Cleveland, OH, United States of America; Department of Pediatrics, Case Western Reserve University, Cleveland, OH, United States of America
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9
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Chen J, Yuan XY, Zhang X. Intracerebral hemorrhage influences hippocampal neurogenesis and neurological function recovery via Notch1 signaling. Neuroreport 2021; 32:489-497. [PMID: 33657078 PMCID: PMC8016514 DOI: 10.1097/wnr.0000000000001614] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 12/22/2020] [Indexed: 11/26/2022]
Abstract
Intracerebral hemorrhage (ICH) is associated with high rate of mortality and morbidity, but lacks effective therapies. Accumulating studies indicated that the hippocampal neurogenesis plays an essential role in the recovery of neurological function after ICH. The Notch1 signaling pathway shows important roles in neurogenesis. However, the effects of Notch1 on the recovery of neurological function after ICH remain unclear. Here, we used ICH mice model to investigate whether Notch1 signaling was involved in the hippocampal neurogenesis and the recovery of neurological function post-ICH. Our results showed that the rate of symmetric division pattern of hippocampal neural stem cells (NSCs) decreased significantly at 3 days after ICH. Meanwhile, the expression of Notch1 in the hippocampus also was reduced significantly. However, Notch1 activator treatment enhanced the expression of Notch1 and increased the number of Sox2+GFAP+ cells. Further, the rate of symmetric division pattern of NSCs also increased after Notch1 activator treatment in mice with ICH. Importantly, the number of DCX+ cells and BrdU+NeuN+ in hippocampus were increased on 28 days post-ICH as the Notch1 expression was upregulated. The motor function and spatial memory ability in post-ICH mice following Notch1 activator treatment also were improved. Taken together, our results suggested that Notch1 signaling could influence the recovery of long-term neurological function by regulating the proliferation and differentiation of the hippocampal NSCs in mice after ICH. Our study may provide ideas for the improvement of neurological function and spatial memory defects after ICH.
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Affiliation(s)
- Jing Chen
- Department of Neurology, Central Hospital of Baoji, Baoji
| | - Xing-Yun Yuan
- Department of Neurology, First Affiliated Hospital of Xi’an Jiao Tong University, Xian, Shanxi Province
| | - Xu Zhang
- Department of Cardiac Surgery, The General Hospital of Northern Theater Command, Shenyang, Liaoning, China
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10
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Khuu MA, Nallamothu T, Castro-Rivera CI, Arias-Cavieres A, Szujewski CC, Garcia Iii AJ. Stage-dependent effects of intermittent hypoxia influence the outcome of hippocampal adult neurogenesis. Sci Rep 2021; 11:6005. [PMID: 33727588 PMCID: PMC7966401 DOI: 10.1038/s41598-021-85357-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 02/25/2021] [Indexed: 12/14/2022] Open
Abstract
Over one billion adults worldwide are estimated to suffer from sleep apnea, a condition with wide-reaching effects on brain health. Sleep apnea causes cognitive decline and is a risk factor for neurodegenerative conditions such as Alzheimer’s disease. Rodents exposed to intermittent hypoxia (IH), a hallmark of sleep apnea, exhibit spatial memory deficits associated with impaired hippocampal neurophysiology and dysregulated adult neurogenesis. We demonstrate that IH creates a pro-oxidant condition that reduces the Tbr2+ neural progenitor pool early in the process, while also suppressing terminal differentiation of adult born neurons during late adult neurogenesis. We further show that IH-dependent cell-autonomous hypoxia inducible factor 1-alpha (HIF1a) signaling is activated in early neuroprogenitors and enhances the generation of adult born neurons upon termination of IH. Our findings indicate that oscillations in oxygen homeostasis, such as those found in sleep apnea, have complex stage-dependent influence over hippocampal adult neurogenesis.
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Affiliation(s)
- Maggie A Khuu
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA
| | - Thara Nallamothu
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA
| | - Carolina I Castro-Rivera
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA.,Committee On Neurobiology, The University of Chicago, Chicago, IL, 60307, USA.,Grossman Institute for Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, IL, 60637, USA
| | - Alejandra Arias-Cavieres
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA
| | - Caroline C Szujewski
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA.,Committee On Neurobiology, The University of Chicago, Chicago, IL, 60307, USA.,Grossman Institute for Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, IL, 60637, USA
| | - Alfredo J Garcia Iii
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA. .,Committee On Neurobiology, The University of Chicago, Chicago, IL, 60307, USA. .,Grossman Institute for Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, IL, 60637, USA.
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11
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Sun C, Fu J, Qu Z, Jia L, Li D, Zhen J, Wang W. Chronic Intermittent Hypobaric Hypoxia Restores Hippocampus Function and Rescues Cognitive Impairments in Chronic Epileptic Rats via Wnt/β-catenin Signaling. Front Mol Neurosci 2021; 13:617143. [PMID: 33584201 PMCID: PMC7874094 DOI: 10.3389/fnmol.2020.617143] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 12/22/2020] [Indexed: 01/05/2023] Open
Abstract
Epilepsy is a complex neurological disorder with frequent psychiatric, cognitive, and social comorbidities in addition to recurrent seizures. Cognitive impairment, one of the most common comorbidities, has severe adverse effects on quality of life. Chronic intermittent hypobaric hypoxia (CIHH) has demonstrated neuroprotective efficacy in several neurological disease models. In the present study, we examined the effects of CIHH on cognition and hippocampal function in chronic epileptic rats. CIHH treatment rescued deficits in spatial and object memory, hippocampal neurogenesis, and synaptic plasticity in pilocarpine-treated epileptic rats. The Wnt/β-catenin pathway has been implicated in neural stem cell proliferation and synapse development, and Wnt/β-catenin pathway inhibition effectively blocked the neurogenic effects of CIHH. Our findings indicate that CIHH rescues cognitive deficits in epileptic rats via Wnt/β-catenin pathway activation. This study establishes CIHH and Wnt/β-catenin pathway regulators as potential treatments for epilepsy- induced cognitive impairments.
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Affiliation(s)
- Can Sun
- Key Laboratory of Neurology of Hebei Province, Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China.,Department of Neurology, Peking University Third Hospital, Beijing, China
| | - Jian Fu
- Department of Emergency Surgery, The Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Zhenzhen Qu
- Key Laboratory of Neurology of Hebei Province, Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Lijing Jia
- Key Laboratory of Neurology of Hebei Province, Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Dongxiao Li
- Key Laboratory of Neurology of Hebei Province, Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Junli Zhen
- Key Laboratory of Neurology of Hebei Province, Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Weiping Wang
- Key Laboratory of Neurology of Hebei Province, Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China
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Zhang Z, Xu D, Zhao S, Lian D, Wu J, He D, Li L. Notch1 Signaling Pathway Promotes Proliferation and Mediates Differentiation Direction in Hippocampus of Streptococcus pneumonia Meningitis Rats. J Infect Dis 2020; 220:1977-1988. [PMID: 31433841 DOI: 10.1093/infdis/jiz414] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Accepted: 08/14/2019] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Streptococcus pneumonia meningitis (PM) is a major cause of childhood neurological deficits. Although the Notch1 signaling pathway regulates neurogenesis and neuroinflammation, we know little about its expression or influence on hippocampal neurogenesis and gliogenesis during PM. METHODS We used immunofluorescence and Western blots to detect Notch1 signaling expression during experimental PM. Through double-labeling immunofluorescence, we investigated proliferation and differentiation in the dentate gyrus (DG) in PM before and after treatment with exogenous Notch1 activator (Jagged1) and inhibitor (IMR-1). RESULTS Our results showed that Notch1 was activated after 24 hours in PM. Compared with the phosphate-buffered saline (PBS) control, Jagged1 increased the proliferation of neural stem cells and progenitor cells (NS/PCs) in DG. After 14 and 28 days of meningitis, astrocyte differentiation increased compared with control. Astrocyte differentiation was higher in the Jagged1 versus the PBS group. In contrast, IMR-1 increased neuronal differentiation but decreased astrocyte differentiation compared with dimethyl sulfoxide treatment. CONCLUSIONS Under PM, Notch1 signaling promotes NS/PC proliferation and astrocyte differentiation in DG, while decreasing neuronal differentiation. Transient activation of the Notch1 signaling pathway explains the reactive gliogenesis and limited neuronal differentiation observed in PM.
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Affiliation(s)
- Zhijie Zhang
- Department of Pediatric Neurology, Xinhua Hospital affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, People's Republic of China
| | - Danfeng Xu
- Department of Pediatric Neurology, Xinhua Hospital affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, People's Republic of China
| | - Shengnan Zhao
- Department of Pediatric Neurology, Xinhua Hospital affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, People's Republic of China
| | - Di Lian
- Department of Pediatric Neurology, Xinhua Hospital affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, People's Republic of China
| | - Jing Wu
- Department of Pediatric Neurology, Xinhua Hospital affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, People's Republic of China
| | - Dake He
- Department of Pediatric Neurology, Xinhua Hospital affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, People's Republic of China
| | - Ling Li
- Department of Pediatric Neurology, Xinhua Hospital affiliated with Shanghai Jiaotong University School of Medicine, Shanghai, People's Republic of China
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13
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Zhao Z, Li B, Wu Y, Chen X, Guo Y, Shen Y, Huang H. Ketamine affects the integration of developmentally generated granule neurons in the adult stage. BMC Neurosci 2019; 20:60. [PMID: 31852437 PMCID: PMC6921590 DOI: 10.1186/s12868-019-0542-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 12/07/2019] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Ketamine has been reported to cause neonatal neurotoxicity in a variety of developing animal models. Various studies have been conducted to study the mechanism of neurotoxicity for general anesthetic use during the neonatal period. Previous experiments have suggested that developmentally generated granule neurons in the hippocampus dentate gyrus (DG) supported hippocampus-dependent memory. Therefore, this study aimed to investigate whether ketamine affects the functional integration of developmentally generated granule neurons in the DG. For this purpose,the postnatal day 7 (PND-7) Sprague-Dawley (SD) rats were divided into the control group and the ketamine group (rats who received 4 injections of 40 mg/kg ketamine at 1 h intervals). To label dividing cells, BrdU was administered for three consecutive days after the ketamine exposure; NeuN+/BrdU+cells were observed by using immunofluorescence. To evaluate the developmentally generated granule neurons that support hippocampus-dependent memory, spatial reference memory was tested by using Morris Water Maze at 3 months old, after which the immunofluorescence was used to detect c-Fos expression in the NeuN+/BrdU+ cells. The expression of caspase-3 was measured by western blot to detect the apoptosis in the hippocampal DG. RESULTS The present results showed that the neonatal ketamine exposure did not influence the survival rate of developmentally generated granule neurons at 2 and 3 months old, but ketamine interfered with the integration of these neurons into the hippocampal DG neural circuits and caused a deficit in hippocampal-dependent spatial reference memory tasks. CONCLUSIONS In summary, these findings may promote more studies to investigate the neurotoxicity of ketamine in the developing brain.
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Affiliation(s)
- Zhanqiang Zhao
- Department of Anesthesiology, Jiangning Hospital of Traditional Chinese Medicine, Nanjing, China
| | - Bing Li
- Department of Anesthesiology, Jiangning Hospital of Traditional Chinese Medicine, Nanjing, China
| | - Yuqing Wu
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou, China
| | - Xujun Chen
- Department of Anesthesiology, Jiangning Hospital of Traditional Chinese Medicine, Nanjing, China
| | - Yan Guo
- Department of Anesthesiology, Jiangning Hospital of Traditional Chinese Medicine, Nanjing, China
| | - Yang Shen
- Department of Anesthesiology, Jiangning Hospital of Traditional Chinese Medicine, Nanjing, China
| | - He Huang
- Department of Anesthesiology, First Affiliated Hospital With Nanjing Medical University, Guangzhou Road 300, Nanjing, 210029, Jiangsu, People's Republic of China.
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14
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Yang T, Jin Y, Duan H, Tu J, Jia D, Zhan S, Liu L, Qi J. Tribological properties of PAANa/UHMWPE composite materials in seawater lubrication. JOURNAL OF POLYMER ENGINEERING 2019. [DOI: 10.1515/polyeng-2019-0149] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
To prepare a high-performance anti-friction and wear-resistant composite material for friction sub-components in marine equipment, a modification was made by adding different amounts sodium polyacrylate (PAANa) to ultra-high molecular weight polyethylene (UHMWPE). PAANa/UHMWPE-blended powders were prepared at individual weight ratios of 0/100, 3/97, 5/95, 8/92, 13/87, and 18/82 with hot-press molding. In seawater, experiments of PAANa/UHMWPE composites sliding against GCr15 have been conducted with a ball-on-disk configuration in this study. The results show the surface hardness of composites was almost the same with the increase in PAANa proportion, however, the friction coefficient and wear scars of PAANa/UHMWPE composites/GCr15 sliding pairs firstly decrease and then increase. Scanning electron microscopy (SEM) results show that wear mechanism of the composites is mainly plastic deformation and spalling. The composites with PAANa content of 3% and 5% achieves better tribological properties than the pure UHMWPE material.
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Affiliation(s)
- Tian Yang
- State Key Laboratory of Special Surface Protection Materials and Application Technology , Wuhan Research Institute of Materials Protection , Wuhan 430030, Hubei , China
| | - Yongliang Jin
- State Key Laboratory of Special Surface Protection Materials and Application Technology , Wuhan Research Institute of Materials Protection , Wuhan 430030, Hubei , China
| | - Haitao Duan
- State Key Laboratory of Special Surface Protection Materials and Application Technology , Wuhan Research Institute of Materials Protection , Wuhan 430030, Hubei , China
| | - Jiesong Tu
- State Key Laboratory of Special Surface Protection Materials and Application Technology , Wuhan Research Institute of Materials Protection , Wuhan 430030, Hubei , China
| | - Dan Jia
- State Key Laboratory of Special Surface Protection Materials and Application Technology , Wuhan Research Institute of Materials Protection , Wuhan 430030, Hubei , China
| | - Shengpeng Zhan
- State Key Laboratory of Special Surface Protection Materials and Application Technology , Wuhan Research Institute of Materials Protection , Wuhan 430030, Hubei , China
| | - Lian Liu
- State Key Laboratory of Special Surface Protection Materials and Application Technology , Wuhan Research Institute of Materials Protection , Wuhan 430030, Hubei , China
| | - Jianwei Qi
- State Key Laboratory of Special Surface Protection Materials and Application Technology , Wuhan Research Institute of Materials Protection , Wuhan 430030, Hubei , China
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Ho DM, Artavanis-Tsakonas S, Louvi A. The Notch pathway in CNS homeostasis and neurodegeneration. WILEY INTERDISCIPLINARY REVIEWS-DEVELOPMENTAL BIOLOGY 2019; 9:e358. [PMID: 31502763 DOI: 10.1002/wdev.358] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 06/19/2019] [Accepted: 06/23/2019] [Indexed: 12/19/2022]
Abstract
The role of the Notch signaling pathway in neural development has been well established over many years. More recent studies, however, have demonstrated that Notch continues to be expressed and active throughout adulthood in many areas of the central nervous system. Notch signals have been implicated in adult neurogenesis, memory formation, and synaptic plasticity in the adult organism, as well as linked to acute brain trauma and chronic neurodegenerative conditions. NOTCH3 mutations are responsible for the most common form of hereditary stroke, the progressive disorder cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy. Notch has also been associated with several progressive neurodegenerative diseases, including Alzheimer's disease, multiple sclerosis, and amyotrophic lateral sclerosis. Although numerous studies link Notch activity with CNS homeostasis and neurodegenerative diseases, the data thus far are primarily correlative, rather than functional. Nevertheless, the evidence for Notch pathway activity in specific neural cellular contexts is strong, and certainly intriguing, and points to the possibility that the pathway carries therapeutic promise. This article is categorized under: Nervous System Development > Flies Signaling Pathways > Cell Fate Signaling Nervous System Development > Vertebrates: General Principles.
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Affiliation(s)
- Diana M Ho
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts
| | | | - Angeliki Louvi
- Departments of Neurosurgery and Neuroscience and Program on Neurogenetics, Yale School of Medicine, New Haven, Connecticut
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16
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Acaz-Fonseca E, Ortiz-Rodriguez A, Azcoitia I, Garcia-Segura LM, Arevalo MA. Notch signaling in astrocytes mediates their morphological response to an inflammatory challenge. Cell Death Discov 2019; 5:85. [PMID: 30962951 PMCID: PMC6447583 DOI: 10.1038/s41420-019-0166-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 03/08/2019] [Accepted: 03/18/2019] [Indexed: 12/19/2022] Open
Abstract
In the nervous system, Notch pathway has a prominent role in the control of neuronal morphology and in the determination of the astrocyte fate. However, the role of Notch in morphological astrocyte plasticity is unknown. Here, we have explored the role of Notch activity on the morphological reactivity of primary astrocytes in response to LPS, an inflammatory stimulus. We found that LPS induces reactive astrocyte morphology by the inhibition of Notch signaling via NFκB activation and Jagged upregulation. In contrast, IGF-1, an anti-inflammatory molecule, inhibits LPS-induced reactive astrocyte morphological phenotype by enhancing Notch signaling through the inhibition of NFκB and the activation of MAPK. Therefore, Notch signaling pathway emerges as a mediator of the regulation of astrocyte morphology by inflammatory and anti-inflammatory stimuli.
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Affiliation(s)
- Estefania Acaz-Fonseca
- Instituto Cajal, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
- CIBER de Investigación Biomédica en Red de Fragilidad y Envejecimiento Saludable (CIBERFES), Instituto de Salud Carlos III, Madrid, Spain
| | - Ana Ortiz-Rodriguez
- Instituto Cajal, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
| | - Iñigo Azcoitia
- CIBER de Investigación Biomédica en Red de Fragilidad y Envejecimiento Saludable (CIBERFES), Instituto de Salud Carlos III, Madrid, Spain
- Department of Cell Biology, Faculty of Biology, Universidad Complutense, Madrid, 28040 Spain
| | - Luis M. Garcia-Segura
- Instituto Cajal, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
- CIBER de Investigación Biomédica en Red de Fragilidad y Envejecimiento Saludable (CIBERFES), Instituto de Salud Carlos III, Madrid, Spain
| | - Maria-Angeles Arevalo
- Instituto Cajal, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
- CIBER de Investigación Biomédica en Red de Fragilidad y Envejecimiento Saludable (CIBERFES), Instituto de Salud Carlos III, Madrid, Spain
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17
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Sun C, Fu J, Qu Z, Li D, Si P, Qiao Q, Zhang W, Xue Y, Zhen J, Wang W. Chronic mild hypoxia promotes hippocampal neurogenesis involving Notch1 signaling in epileptic rats. Brain Res 2019; 1714:88-98. [PMID: 30768929 DOI: 10.1016/j.brainres.2019.02.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 02/06/2019] [Accepted: 02/11/2019] [Indexed: 01/08/2023]
Abstract
Cognitive impairment is one of the most common and disabling co-morbidities of epilepsy. It is therefore imperative to find novel treatment approaches to rescue cognitive function among epilepsy patients. Adult neurogenesis is strongly implicated in cognitive function, and mild hypoxia is known to promote the proliferation and differentiation of both embryonic and adult neural stem cells (NSCs). In the present study, we investigated the effect of mild hypoxia on cognitive function and hippocampal neurogenesis of rats with pilocarpine-induced chronic epilepsy. Chronic epilepsy induced marked spatial learning and memory deficits in the Morris water maze that were rescued by consecutively 28 days mild hypoxia exposure (6 h/d at 3000 m altitude equivalent) during the chronic phase. Moreover, mild hypoxia reversed the suppression of hippocampal neurogenesis and the downregulation of NT-3 and BDNF expression in hippocampus and cortex of epileptic rats. Mild hypoxia in vitro also promoted hippocampus-derived NSC proliferation and neuronal differentiation. In addition, mild hypoxia enhanced Notch1 and Hes1 expression, suggesting that Notch1 signaling may be involved in neuroprotection of hypoxia. Our data may help to pave the way for identifying new therapeutic targets for rescuing cognition conflicts in epileptic patients by using hypoxia to promote hippocampus neurogenesis.
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Affiliation(s)
- Can Sun
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Jian Fu
- Department of Emergency, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Zhenzhen Qu
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Dongxiao Li
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Peipei Si
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Qi Qiao
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Wenlin Zhang
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Yan Xue
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China
| | - Junli Zhen
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China.
| | - Weiping Wang
- Department of Neurology, Key Laboratory of Neurology of Hebei Province, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, People's Republic of China.
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18
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Wu LY, He YL, Zhu LL. Possible Role of PHD Inhibitors as Hypoxia-Mimicking Agents in the Maintenance of Neural Stem Cells' Self-Renewal Properties. Front Cell Dev Biol 2018; 6:169. [PMID: 30619851 PMCID: PMC6297135 DOI: 10.3389/fcell.2018.00169] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Accepted: 11/28/2018] [Indexed: 12/17/2022] Open
Abstract
Hypoxia is the most critical factor for maintaining stemness. During embryonic development, neural stem cells (NSCs) reside in hypoxic niches, and different levels of oxygen pressure and time of hypoxia exposure play important roles in the development of NSCs. Such hypoxic niches exist in adult brain tissue, where the neural precursors originate. Hypoxia-inducible factors (HIFs) are key transcription heterodimers consisting of regulatory α-subunits (HIF-1α, HIF-2α, HIF-3α) and a constitutive β-subunit (HIF-β). Regulation of downstream targets determines the fate of NSCs. In turn, the stability of HIFs-α is regulated by prolyl hydroxylases (PHDs), whose activity is principally modulated by PHD substrates like oxygen (O2), α-ketoglutarate (α-KG), and the co-factors ascorbate (ASC) and ferrous iron (Fe2+). It follows that the transcriptional activity of HIFs is actually determined by the contents of O2, α-KG, ASC, and Fe2+. In normoxia, HIFs-α are rapidly degraded via the ubiquitin-proteasome pathway, in which PHDs, activated by O2, lead to hydroxylation of HIFs-α at residues 402 and 564, followed by recognition by the tumor suppressor protein von Hippel–Lindau (pVHL) as an E3 ligase and ubiquitin labeling. Conversely, in hypoxia, the activity of PHDs is inhibited by low O2 levels and HIFs-α can thus be stabilized. Hence, suppression of PHD activity in normoxic conditions, mimicking the effect of hypoxia, might be beneficial for preserving the stemness of NSCs, and it is clinically relevant as a therapeutic approach for enhancing the number of NSCs in vitro and for cerebral ischemia injury in vivo. This study will review the putative role of PHD inhibitors on the self-renewal of NSCs.
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Affiliation(s)
- Li-Ying Wu
- Beijing Institute of Cognition and Brain Sciences, Beijing, China.,State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, Beijing, China
| | - Yun-Ling He
- Beijing Institute of Cognition and Brain Sciences, Beijing, China
| | - Ling-Ling Zhu
- Beijing Institute of Cognition and Brain Sciences, Beijing, China.,Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
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19
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Li Y, Wu L, Yu M, Yang F, Wu B, Lu S, Tu M, Xu H. HIF-1α is Critical for the Activation of Notch Signaling in Neurogenesis During Acute Epilepsy. Neuroscience 2018; 394:206-219. [PMID: 30394322 DOI: 10.1016/j.neuroscience.2018.10.037] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 09/30/2018] [Accepted: 10/22/2018] [Indexed: 01/01/2023]
Abstract
Emerging evidence suggests that hypoxia-inducible factors (specifically, HIF-1α) and Notch signaling are involved in epileptogenesis and that cross-coupling exists between HIF-1α and Notch signaling in other diseases, including tumors and ischemia. However, the exact molecular mechanisms by which HIF-1α and Notch signaling affect the development of epilepsy, especially regarding neurogenesis, remain unclear. In the present study, we investigated the role of HIF-1α in neurogenesis and whether Notch signaling is involved in this process during epileptogenesis by assessing hippocampal apoptosis, neuronal injury, and the proliferation and differentiation of neural stem cells (NSCs) in four groups, including control, epilepsy, epilepsy+2-methoxyestradiol (2ME2) and epilepsy+GSI-IX (DAPT) groups. Our data demonstrated that HIF-1α mediated neurogenesis during acute epilepsy, which required the participation of Notch signaling. The immunoprecipitation data illustrated that HIF-1α activated Notch signaling by physically interacting with the Notch intracellular domain (NICD) in epilepsy. In conclusion, our results suggested that HIF-1α-Notch signaling enhanced neurogenesis in acute epilepsy and that neurogenesis during epileptogenesis was reduced once this pathway was blocked; thus, members of this pathway might be potential therapeutic targets for epilepsy.
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Affiliation(s)
- Yushuang Li
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Lei Wu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Minhua Yu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Fei Yang
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Bo Wu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Shuting Lu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Mengqi Tu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China
| | - Haibo Xu
- Department of Radiology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, PR China.
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20
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Viscor G, Torrella JR, Corral L, Ricart A, Javierre C, Pages T, Ventura JL. Physiological and Biological Responses to Short-Term Intermittent Hypobaric Hypoxia Exposure: From Sports and Mountain Medicine to New Biomedical Applications. Front Physiol 2018; 9:814. [PMID: 30038574 PMCID: PMC6046402 DOI: 10.3389/fphys.2018.00814] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 06/11/2018] [Indexed: 12/14/2022] Open
Abstract
In recent years, the altitude acclimatization responses elicited by short-term intermittent exposure to hypoxia have been subject to renewed attention. The main goal of short-term intermittent hypobaric hypoxia exposure programs was originally to improve the aerobic capacity of athletes or to accelerate the altitude acclimatization response in alpinists, since such programs induce an increase in erythrocyte mass. Several model programs of intermittent exposure to hypoxia have presented efficiency with respect to this goal, without any of the inconveniences or negative consequences associated with permanent stays at moderate or high altitudes. Artificial intermittent exposure to normobaric hypoxia systems have seen a rapid rise in popularity among recreational and professional athletes, not only due to their unbeatable cost/efficiency ratio, but also because they help prevent common inconveniences associated with high-altitude stays such as social isolation, nutritional limitations, and other minor health and comfort-related annoyances. Today, intermittent exposure to hypobaric hypoxia is known to elicit other physiological response types in several organs and body systems. These responses range from alterations in the ventilatory pattern to modulation of the mitochondrial function. The central role played by hypoxia-inducible factor (HIF) in activating a signaling molecular cascade after hypoxia exposure is well known. Among these targets, several growth factors that upregulate the capillary bed by inducing angiogenesis and promoting oxidative metabolism merit special attention. Applying intermittent hypobaric hypoxia to promote the action of some molecules, such as angiogenic factors, could improve repair and recovery in many tissue types. This article uses a comprehensive approach to examine data obtained in recent years. We consider evidence collected from different tissues, including myocardial capillarization, skeletal muscle fiber types and fiber size changes induced by intermittent hypoxia exposure, and discuss the evidence that points to beneficial interventions in applied fields such as sport science. Short-term intermittent hypoxia may not only be useful for healthy people, but could also be considered a promising tool to be applied, with due caution, to some pathophysiological states.
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Affiliation(s)
- Ginés Viscor
- Physiology Section, Department of Cell Biology, Physiology and Immunology, Faculty of Biology, Universitat de Barcelona, Barcelona, Spain
| | - Joan R. Torrella
- Physiology Section, Department of Cell Biology, Physiology and Immunology, Faculty of Biology, Universitat de Barcelona, Barcelona, Spain
| | - Luisa Corral
- Exercise Physiology Unit, Department of Physiological Sciences, Faculty of Medicine and Health Sciences, Universitat de Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain
| | - Antoni Ricart
- Exercise Physiology Unit, Department of Physiological Sciences, Faculty of Medicine and Health Sciences, Universitat de Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain
| | - Casimiro Javierre
- Exercise Physiology Unit, Department of Physiological Sciences, Faculty of Medicine and Health Sciences, Universitat de Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain
| | - Teresa Pages
- Physiology Section, Department of Cell Biology, Physiology and Immunology, Faculty of Biology, Universitat de Barcelona, Barcelona, Spain
| | - Josep L. Ventura
- Exercise Physiology Unit, Department of Physiological Sciences, Faculty of Medicine and Health Sciences, Universitat de Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain
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21
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Zhu B, Zhao L, Luo D, Xu D, Tan T, Dong Z, Tang Y, Min Z, Deng X, Sun F, Yan Z, Chen G. Furin promotes dendritic morphogenesis and learning and memory in transgenic mice. Cell Mol Life Sci 2018; 75:2473-2488. [PMID: 29302702 PMCID: PMC11105492 DOI: 10.1007/s00018-017-2742-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Revised: 11/30/2017] [Accepted: 12/27/2017] [Indexed: 01/14/2023]
Abstract
Furin is a proprotein convertase implicated in a variety of pathological processes including neurodegenerative diseases. However, the role of furin in neuronal plasticity and learning and memory remains to be elucidated. Here, we report that in brain-specific furin transgenic (Furin-Tg) mice, the dendritic spine density and proliferation of neural progenitor cells were significantly increased. These mice exhibited enhanced long-term potentiation (LTP) and spatial learning and memory performance, without alterations of miniature excitatory/inhibitory postsynaptic currents. In the cortex and hippocampus of Furin-Tg mice, the ratio of mature brain-derived neurotrophic factor (mBDNF) to pro-BDNF, and the activities of extracellular signal-related kinase (ERK) and cAMP response element-binding protein (CREB) were significantly elevated. We also found that hippocampal knockdown of CREB diminished the facilitation of LTP and cognitive function in Furin-Tg mice. Together, our results demonstrate that furin enhances dendritic morphogenesis and learning and memory in transgenic mice, which may be associated with BDNF-ERK-CREB signaling pathway.
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Affiliation(s)
- Binglin Zhu
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Neurology, 1 Youyi Road, Chongqing, 400016, China
| | - Lige Zhao
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Neurology, 1 Youyi Road, Chongqing, 400016, China
| | - Dong Luo
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Neurology, 1 Youyi Road, Chongqing, 400016, China
| | - Demei Xu
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Neurology, 1 Youyi Road, Chongqing, 400016, China
| | - Tao Tan
- Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Children's Hospital of Chongqing Medical University, 136 Zhongshan Er Lu, Chongqing, 400014, China
| | - Zhifang Dong
- Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Children's Hospital of Chongqing Medical University, 136 Zhongshan Er Lu, Chongqing, 400014, China
| | - Ying Tang
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Neurology, 1 Youyi Road, Chongqing, 400016, China
| | - Zhuo Min
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Neurology, 1 Youyi Road, Chongqing, 400016, China
| | - Xiaojuan Deng
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Neurology, 1 Youyi Road, Chongqing, 400016, China
| | - Fei Sun
- Department of Physiology, Wayne State University School of Medicine, Detroit, MI, 48201, USA
| | - Zhen Yan
- Department of Physiology and Biophysics, State University of New York at Buffalo, Buffalo, NY, 14214, USA
| | - Guojun Chen
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Key Laboratory of Neurology, 1 Youyi Road, Chongqing, 400016, China.
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Notch signaling and neuronal death in stroke. Prog Neurobiol 2018; 165-167:103-116. [PMID: 29574014 DOI: 10.1016/j.pneurobio.2018.03.002] [Citation(s) in RCA: 89] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 02/08/2018] [Accepted: 03/20/2018] [Indexed: 12/18/2022]
Abstract
Ischemic stroke is a leading cause of morbidity and death, with the outcome largely determined by the amount of hypoxia-related neuronal death in the affected brain regions. Cerebral ischemia and hypoxia activate the Notch1 signaling pathway and four prominent interacting pathways (NF-κB, p53, HIF-1α and Pin1) that converge on a conserved DNA-associated nuclear multi-protein complex, which controls the expression of genes that can determine the fate of neurons. When neurons experience a moderate level of ischemic insult, the nuclear multi-protein complex up-regulates adaptive stress response genes encoding proteins that promote neuronal survival, but when ischemia is more severe the nuclear multi-protein complex induces genes encoding proteins that trigger and execute a neuronal death program. We propose that the nuclear multi-protein transcriptional complex is a molecular mediator of neuronal hormesis and a target for therapeutic intervention in stroke.
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Feng S, Shi T, Qiu J, Yang H, Wu Y, Zhou W, Wang W, Wu H. Notch1 deficiency in postnatal neural progenitor cells in the dentate gyrus leads to emotional and cognitive impairment. FASEB J 2017; 31:4347-4358. [PMID: 28611114 DOI: 10.1096/fj.201700216rr] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 05/30/2017] [Indexed: 01/19/2023]
Abstract
It is well known that Notch1 signaling plays a crucial role in embryonic neural development and adult neurogenesis. The latest evidence shows that Notch1 also plays a critical role in synaptic plasticity in mature hippocampal neurons. So far, deeper insights into the function of Notch1 signaling during the different steps of adult neurogenesis are still lacking, and the mechanisms by which Notch1 dysfunction is associated with brain disorders are also poorly understood. In the current study, we found that Notch1 was highly expressed in the adult-born immature neurons in the hippocampal dentate gyrus. Using a genetic approach to selectively ablate Notch1 signaling in late immature precursors in the postnatal hippocampus by cross-breeding doublecortin (DCX)+ neuron-specific proopiomelanocortin (POMC)-α Cre mice with floxed Notch1 mice, we demonstrated a previously unreported pivotal role of Notch1 signaling in survival and function of adult newborn neurons in the dentate gyrus. Moreover, behavioral and functional studies demonstrated that POMC-Notch1-/- mutant mice showed anxiety and depressive-like behavior with impaired synaptic transmission properties in the dentate gyrus. Finally, our mechanistic study showed significantly compromised phosphorylation of cAMP response element-binding protein (CREB) in Notch1 mutants, suggesting that the dysfunction of Notch1 mutants is associated with the disrupted pCREB signaling in postnatally generated immature neurons in the dentate gyrus.-Feng, S., Shi, T., Qiu, J., Yang, H., Wu, Y., Zhou, W., Wang, W., Wu, H. Notch1 deficiency in postnatal neural progenitor cells in the dentate gyrus leads to emotional and cognitive impairment.
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Affiliation(s)
- Shufang Feng
- Department of Neurobiology, Beijing Institute of Basic Medical Sciences, Beijing, China
| | - Tianyao Shi
- Department of Traditional Chinese Medicine (TCM) and Neuroimmunopharmacology, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Jiangxia Qiu
- Department of Neurobiology, Beijing Institute of Basic Medical Sciences, Beijing, China
| | - Haihong Yang
- Department of Neurobiology, Beijing Institute of Basic Medical Sciences, Beijing, China
| | - Yan Wu
- Department of Neurobiology, Beijing Institute of Basic Medical Sciences, Beijing, China
| | - Wenxia Zhou
- Department of Traditional Chinese Medicine (TCM) and Neuroimmunopharmacology, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Wei Wang
- Department of Orthopedics Research Institute, First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China
| | - Haitao Wu
- Department of Neurobiology, Beijing Institute of Basic Medical Sciences, Beijing, China; .,Key Laboratory of Neuroregeneration, Coinnovation Center of Neuroregeneration, Nantong University, Nantong, China
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24
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Denicolaï E, Tabouret E, Colin C, Metellus P, Nanni I, Boucard C, Tchoghandjian A, Meyronet D, Baeza-Kallee N, Chinot O, Figarella-Branger D. Molecular heterogeneity of glioblastomas: does location matter? Oncotarget 2016; 7:902-13. [PMID: 26637806 PMCID: PMC4808041 DOI: 10.18632/oncotarget.6433] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 11/20/2015] [Indexed: 02/03/2023] Open
Abstract
Glioblastomas in adults are highly heterogeneous tumors that can develop throughout the brain. To date no predictive-location marker has been identified. We previously derived two glioblastoma cell lines from cortical and periventricular locations and demonstrated distinct transcriptomic profiles. Based on these preliminary results, the aim of this study was to correlate glioblastoma locations with the expression of ten selected genes (VEGFC, FLT4, MET, HGF, CHI3L1, PROM1, NOTCH1, DLL3, PDGFRA, BCAN). Fifty nine patients with newly diagnosed glioblastomas were retrospectively included. Tumors were classified into cortical and periventricular locations, which were subsequently segregated according to cerebral lobes involved: cortical fronto-parietal (C-FP), cortical temporal (C-T), periventricular fronto-parietal (PV-FP), periventricular temporal (PV-T), and periventricular occipital (PV-O). Gene expression levels were determined using RT-qPCR. Compared to cortical glioblastomas, periventricular glioblastomas were characterized by a higher expression of two mesenchymal genes, VEGFC (p = 0.001) and HGF (p = 0.001). Among cortical locations, gene expressions were homogeneous. In contrast, periventricular locations exhibited distinct expression profiles. PV-T tumors were associated with higher expression of two proneural and cancer stem cell genes, NOTCH1 (p = 0.028) and PROM1 (p = 0.033) while PV-FP tumors were characterized by high expression of a mesenchymal gene, CHI3L1 (p = 0.006). Protein expression of NOTCH1 was correlated with RNA expression levels. PV-O glioblastomas were associated with lower expression of VEGFC (p = 0.032) than other periventricular locations, whereas MET overexpression remained exceptional. These data suggest a differential gene expression profile according to initial glioblastoma location.
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Affiliation(s)
- Emilie Denicolaï
- Aix-Marseille University, CRO2 UMR 911, Inserm UMR_S 911, Marseille, 13385, France
| | - Emeline Tabouret
- Aix-Marseille University, CRO2 UMR 911, Inserm UMR_S 911, Marseille, 13385, France.,AP-HM, Timone Hospital, Department of Neuro-Oncology, Marseille, 13385, France
| | - Carole Colin
- Aix-Marseille University, CRO2 UMR 911, Inserm UMR_S 911, Marseille, 13385, France
| | - Philippe Metellus
- AP-HM, Timone Hospital, Department of Neuro-Surgery, Marseille, 13385, France
| | - Isabelle Nanni
- AP-HM, North Hospital, Transfer Laboratory, Marseille, 13915, France
| | - Celine Boucard
- AP-HM, Timone Hospital, Department of Neuro-Oncology, Marseille, 13385, France
| | | | - David Meyronet
- Hospices Civils de Lyon, Centre de Pathologie et de Neuropathologie Est, Lyon, 69677, France
| | | | - Olivier Chinot
- Aix-Marseille University, CRO2 UMR 911, Inserm UMR_S 911, Marseille, 13385, France.,AP-HM, Timone Hospital, Department of Neuro-Oncology, Marseille, 13385, France
| | - Dominique Figarella-Branger
- Aix-Marseille University, CRO2 UMR 911, Inserm UMR_S 911, Marseille, 13385, France.,AP-HM, Timone Hospital, Department of Anatomopathology, Marseille, 13385, France
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25
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Felling RJ, Covey MV, Wolujewicz P, Batish M, Levison SW. Astrocyte-produced leukemia inhibitory factor expands the neural stem/progenitor pool following perinatal hypoxia-ischemia. J Neurosci Res 2016; 94:1531-1545. [PMID: 27661001 DOI: 10.1002/jnr.23929] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Revised: 08/30/2016] [Accepted: 08/31/2016] [Indexed: 12/14/2022]
Abstract
Brain injuries, such as cerebral hypoxia-ischemia (H-I), induce a regenerative response from the neural stem/progenitors (NSPs) of the subventricular zone (SVZ); however, the mechanisms that regulate this expansion have not yet been fully elucidated. The Notch- Delta-Serrate-Lag2 (DSL) signaling pathway is considered essential for the maintenance of neural stem cells, but it is not known if it is necessary for the expansion of the NSPs subsequent to perinatal H-I injury. Therefore, the aim of this study was to investigate whether this pathway contributes to NSP expansion in the SVZ after H-I and, if so, to establish whether this pathway is directly induced by H-I or regulated by paracrine factors. Here we report that Notch1 receptor induction and one of its ligands, Delta-like 1, precedes NSP expansion after perinatal H-I in P6 rat pups and that this increase occurs specifically in the most medial cell layers of the SVZ where the stem cells reside. Pharmacologically inhibiting Notch signaling in vivo diminished NSP expansion. With an in vitro model of H-I, Notch1 was not induced directly by hypoxia, but was stimulated by soluble factors, specifically leukemia inhibitory factor, produced by astrocytes within the SVZ. These data confirm the importance both of the Notch-DSL signaling pathway in the expansion of NSPs after H-I and in the role of the support cells in their niche. They further support the body of evidence that indicates that leukemia inhibitory factor is a key injury-induced cytokine that is stimulating the regenerative response of the NSPs. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Ryan J Felling
- Departments of Neurology and Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland.,Department of Pharmacology, Physiology and Neuroscience, RBHS-New Jersey Medical School, Newark, New Jersey
| | - Matthew V Covey
- Department of Pharmacology, Physiology and Neuroscience, RBHS-New Jersey Medical School, Newark, New Jersey
| | - Paul Wolujewicz
- Department of Microbiology, Biochemistry and Molecular Genetics, RBHS-New Jersey Medical School, Newark, New Jersey
| | - Mona Batish
- Department of Microbiology, Biochemistry and Molecular Genetics, RBHS-New Jersey Medical School, Newark, New Jersey
| | - Steven W Levison
- Department of Pharmacology, Physiology and Neuroscience, RBHS-New Jersey Medical School, Newark, New Jersey.
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26
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Zhang F, Qian X, Qin C, Lin Y, Wu H, Chang L, Luo C, Zhu D. Phosphofructokinase-1 Negatively Regulates Neurogenesis from Neural Stem Cells. Neurosci Bull 2016; 32:205-16. [PMID: 27146165 DOI: 10.1007/s12264-016-0032-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2015] [Accepted: 03/13/2016] [Indexed: 12/31/2022] Open
Abstract
Phosphofructokinase-1 (PFK-1), a major regulatory glycolytic enzyme, has been implicated in the functions of astrocytes and neurons. Here, we report that PFK-1 negatively regulates neurogenesis from neural stem cells (NSCs) by targeting pro-neural transcriptional factors. Using in vitro assays, we found that PFK-1 knockdown enhanced, and PFK-1 overexpression inhibited the neuronal differentiation of NSCs, which was consistent with the findings from NSCs subjected to 5 h of hypoxia. Meanwhile, the neurogenesis induced by PFK-1 knockdown was attributed to the increased proliferation of neural progenitors and the commitment of NSCs to the neuronal lineage. Similarly, in vivo knockdown of PFK-1 also increased neurogenesis in the dentate gyrus of the hippocampus. Finally, we demonstrated that the neurogenesis mediated by PFK-1 was likely achieved by targeting mammalian achaete-scute homologue-1 (Mash 1), neuronal differentiation factor (NeuroD), and sex-determining region Y (SRY)-related HMG box 2 (Sox2). All together, our results reveal PFK-1 as an important regulator of neurogenesis.
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Affiliation(s)
- Fengyun Zhang
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China
| | - Xiaodan Qian
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China
| | - Cheng Qin
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China
| | - Yuhui Lin
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China
| | - Haiyin Wu
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China
| | - Lei Chang
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China
| | - Chunxia Luo
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China.,Institute of Stem Cells and Neuroregeneration, Nanjing Medical University, Nanjing, 211166, China.,Laboratory of Cerebrovascular Disease, Nanjing Medical University, Nanjing, 211166, China
| | - Dongya Zhu
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China. .,Institute of Stem Cells and Neuroregeneration, Nanjing Medical University, Nanjing, 211166, China. .,Laboratory of Cerebrovascular Disease, Nanjing Medical University, Nanjing, 211166, China. .,Key Laboratory of Human Functional Genomics of Jiangsu Province, Nanjing, 211166, China.
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27
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Huang H, Liu CM, Sun J, Hao T, Xu CM, Wang D, Wu YQ. Ketamine Affects the Neurogenesis of the Hippocampal Dentate Gyrus in 7-Day-Old Rats. Neurotox Res 2016; 30:185-98. [PMID: 26966008 DOI: 10.1007/s12640-016-9615-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 02/22/2016] [Accepted: 03/01/2016] [Indexed: 01/20/2023]
Abstract
Ketamine has been reported to cause neonatal neurotoxicity via a neuronal apoptosis mechanism; however, no in vivo research has reported whether ketamine could affect postnatal neurogenesis in the hippocampal dentate gyrus (DG). A growing number of experiments suggest that postnatal hippocampal neurogenesis is the foundation of maintaining normal hippocampus function into adulthood. Therefore, this study investigated the effect of ketamine on hippocampal neurogenesis. Male Sprague-Dawley rats were divided into two groups: the control group (equal volume of normal saline), and the ketamine-anesthesia group (40 mg/kg ketamine in four injections at 1 h intervals). The S-phase marker 5-bromodeoxyuridine (BrdU) was administered after ketamine exposure to postnatal day 7 (PND-7) rats, and the neurogenesis in the hippocampal DG was assessed using single- or double-immunofluorescence staining. The expression of GFAP in the hippocampal DG was measured by western blot analysis. Spatial reference memory was tested by Morris water maze at 2 months after PND-7 rats exposed to ketamine treatment. The present results showed that neonatal ketamine exposure significantly inhibited neural stem cell (NSC) proliferation, decreased astrocytic differentiation, and markedly enhanced neuronal differentiation. The disruptive effect of ketamine on the proliferation and differentiation of NSCs lasted at least 1 week and disappeared by 2 weeks after ketamine exposure. Moreover, the migration of newborn neurons in the granule cell layer and the growth of astrocytes in the hippocampal DG were inhibited by ketamine on PND-37 and PND-44. Finally, ketamine caused a deficit in hippocampal-dependent spatial reference memory tasks at 2 months old. Our results suggested that ketamine may interfere with hippocampal neurogenesis and long-term neurocognitive function in PND-7 rats. These findings may provide a new perspective to explain the adult neurocognitive dysfunction induced by neonatal ketamine exposure.
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Affiliation(s)
- He Huang
- Department of Anesthesiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Cun-Ming Liu
- Department of Anesthesiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Jie Sun
- Department of Anesthesiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Ting Hao
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical College, Xuzhou, China
| | - Chun-Mei Xu
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical College, Xuzhou, China
| | - Dan Wang
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical College, Xuzhou, China
| | - Yu-Qing Wu
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical College, Xuzhou, China.
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28
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Wagenführ L, Meyer AK, Marrone L, Storch A. Oxygen Tension Within the Neurogenic Niche Regulates Dopaminergic Neurogenesis in the Developing Midbrain. Stem Cells Dev 2016; 25:227-38. [PMID: 26577812 DOI: 10.1089/scd.2015.0214] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Oxygen tension is an important factor controlling stem cell proliferation and maintenance in various stem cell populations with a particular relevance in midbrain dopaminergic progenitors. Further studies have shown that the oxygen-dependent transcription factor hypoxia-inducible factor 1α (HIF-1α) is involved in these processes. However, all available studies on oxygen effects in dopaminergic neuroprogenitors were performed in vitro and thus it remains unclear whether tissue oxygen tension in the embryonic midbrain is also relevant for the regulation of dopaminergic neurogenesis in vivo. We thus dissect here the effects of oxygen tension in combination with HIF-1α conditional knockout on dopaminergic neurogenesis by using a novel experimental design allowing for the control of oxygen tension within the microenvironment of the neurogenic niche of the murine fetal midbrain in vivo. The microenvironment of the midbrain dopaminergic neurogenic niche was detected as hypoxic with oxygen tensions below 1.1%. Maternal oxygen treatment of 10%, 21%, and 75% atmospheric oxygen tension for 48 h translates into robust changes in fetal midbrain oxygenation. Fetal midbrain hypoxia hampered the generation of dopaminergic neurons and is accompanied with restricted fetal midbrain development. In contrast, induced hyperoxia stimulated proliferation and differentiation of dopaminergic progenitors during early and late embryogenesis. Oxygen effects were not directly mediated through HIF-1α signaling. These data--in agreement with in vitro data-indicate that oxygen is a crucial regulator of developmental dopaminergic neurogenesis. Our study provides the initial framework for future studies on molecular mechanisms mediating oxygen regulation of dopaminergic neurogenesis within the fetal midbrain as its natural environment.
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Affiliation(s)
- Lisa Wagenführ
- 1 Division of Neurodegenerative Diseases, Department of Neurology, Technische Universität Dresden , Dresden, Germany
| | - Anne Karen Meyer
- 1 Division of Neurodegenerative Diseases, Department of Neurology, Technische Universität Dresden , Dresden, Germany
| | - Lara Marrone
- 1 Division of Neurodegenerative Diseases, Department of Neurology, Technische Universität Dresden , Dresden, Germany .,2 Center for Regenerative Therapies Dresden (CRTD) , Technische Universität Dresden, Dresden, Germany
| | - Alexander Storch
- 1 Division of Neurodegenerative Diseases, Department of Neurology, Technische Universität Dresden , Dresden, Germany .,2 Center for Regenerative Therapies Dresden (CRTD) , Technische Universität Dresden, Dresden, Germany .,3 Department of Neurology, University of Rostock , Rostock, Germany .,4 German Centre for Neurodegenerative Diseases (DZNE) , Rostock, Germany
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29
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Kalinina N, Kharlampieva D, Loguinova M, Butenko I, Pobeguts O, Efimenko A, Ageeva L, Sharonov G, Ischenko D, Alekseev D, Grigorieva O, Sysoeva V, Rubina K, Lazarev V, Govorun V. Characterization of secretomes provides evidence for adipose-derived mesenchymal stromal cells subtypes. Stem Cell Res Ther 2015; 6:221. [PMID: 26560317 PMCID: PMC4642680 DOI: 10.1186/s13287-015-0209-8] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Revised: 02/18/2015] [Accepted: 10/20/2015] [Indexed: 12/15/2022] Open
Abstract
Introduction This study was aimed at deciphering the secretome of adipose-derived mesenchymal stromal cells (ADSCs) cultured in standard and hypoxic conditions to reveal proteins, which may be responsible for regenerative action of these cells. Methods Human ADSCs were isolated from 10 healthy donors and cultured for 3–4 passages. Cells were serum deprived and cell purity was assessed using multiple cell surface markers. Conditioned media was collected and analyzed using LC-MS with a focus on characterizing secreted proteins. Results Purity of the ADSC assessed as CD90+/CD73+/CD105+/CD45-/CD31- cells was greater than 99 % and viability was greater than 97 %. More than 600 secreted proteins were detected in conditioned media of ADSCs. Of these 100 proteins were common to all cultures and included key molecules involved in tissue regeneration such as collagens and collagen maturation enzymes, matrix metalloproteases, matricellular proteins, macrophage-colony stimulating factor and pigment epithelium derived factor. Common set of proteins also included molecules, which contribute to regenerative processes but were not previously associated with ADSCs. These included olfactomedin-like 3, follistatin-like 1 and prosaposin. In addition, ADSCs from the different subjects secreted proteins, which were variable between different cultures. These included proteins with neurotrophic activities, which were not previously associated with ADSCs, such as mesencephalic astrocyte-derived neurotrophic factor, meteorin and neuron derived neurotrophic factor. Hypoxia resulted in secretion of 6 proteins, the most prominent included EGF-like repeats and discoidin I-like domains 3, adrenomedullin and ribonuclease 4 of RNase A family. It also caused the disappearance of 8 proteins, including regulator of osteogenic differentiation cartilage-associated protein. Conclusions Human ADSCs with CD90+/CD73+/CD105+/CD45-/CD31-/PDGFRβ+/NG2+/CD146+(−) immunophenotype secrete a large array of proteins, the most represented group is comprised of extracellular matrix components. Number of secreted proteins is largely unaffected by prolonged hypoxia. Variability in the secretion of several proteins from cultured ADSCs of individual subjects suggests that these cells exist as a heterogeneous population containing functionally distinct subtypes, which differ in numbers between donors. Electronic supplementary material The online version of this article (doi:10.1186/s13287-015-0209-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Natalia Kalinina
- Faculty of Medicine, Lomonosov Moscow State University, 31-5, Lomonosovsky av, Moscow, 119191, Russia.
| | - Daria Kharlampieva
- Department of Molecular Biology and Genetics, SRI of Physical-Chemical Medicine, 1a, Malaya Pirogovskaya, Moscow, 119435, Russia.
| | - Marina Loguinova
- Department of Molecular Biology and Genetics, SRI of Physical-Chemical Medicine, 1a, Malaya Pirogovskaya, Moscow, 119435, Russia.
| | - Ivan Butenko
- Department of Molecular Biology and Genetics, SRI of Physical-Chemical Medicine, 1a, Malaya Pirogovskaya, Moscow, 119435, Russia.
| | - Olga Pobeguts
- Department of Molecular Biology and Genetics, SRI of Physical-Chemical Medicine, 1a, Malaya Pirogovskaya, Moscow, 119435, Russia.
| | - Anastasia Efimenko
- Faculty of Medicine, Lomonosov Moscow State University, 31-5, Lomonosovsky av, Moscow, 119191, Russia.
| | - Luidmila Ageeva
- Faculty of Medicine, Lomonosov Moscow State University, 31-5, Lomonosovsky av, Moscow, 119191, Russia.
| | - George Sharonov
- Faculty of Medicine, Lomonosov Moscow State University, 31-5, Lomonosovsky av, Moscow, 119191, Russia.
| | - Dmitry Ischenko
- Department of Molecular Biology and Genetics, SRI of Physical-Chemical Medicine, 1a, Malaya Pirogovskaya, Moscow, 119435, Russia.
| | - Dmitry Alekseev
- Department of Molecular Biology and Genetics, SRI of Physical-Chemical Medicine, 1a, Malaya Pirogovskaya, Moscow, 119435, Russia.
| | - Olga Grigorieva
- Faculty of Medicine, Lomonosov Moscow State University, 31-5, Lomonosovsky av, Moscow, 119191, Russia.
| | - Veronika Sysoeva
- Faculty of Medicine, Lomonosov Moscow State University, 31-5, Lomonosovsky av, Moscow, 119191, Russia.
| | - Ksenia Rubina
- Faculty of Medicine, Lomonosov Moscow State University, 31-5, Lomonosovsky av, Moscow, 119191, Russia.
| | - Vassiliy Lazarev
- Department of Molecular Biology and Genetics, SRI of Physical-Chemical Medicine, 1a, Malaya Pirogovskaya, Moscow, 119435, Russia.
| | - Vadim Govorun
- Department of Molecular Biology and Genetics, SRI of Physical-Chemical Medicine, 1a, Malaya Pirogovskaya, Moscow, 119435, Russia.
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Shang J, Guo XL, Deng Y, Yuan X, Liu HG. Regulatory effects of AT₁R-TRAF6-MAPKs signaling on proliferation of intermittent hypoxia-induced human umbilical vein endothelial cells. ACTA ACUST UNITED AC 2015. [PMID: 26223916 DOI: 10.1007/s11596-015-1459-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Endothelial dysfunction induced by intermittent hypoxia (IH) participates in obstructive sleep apnea syndrome (OSAS)-associated cardiovascular disorders. Myeloid differentiation primary response 88 (MyD88) and tumor necrosis factor receptor-associated factor 6 (TRAF6) regulate numerous downstream adaptors like mitogen-activated protein kinases (MAPKs) and the subsequent oxidative stress and inflammatory responses. This study aimed to characterize the role of MyD88/TRAF6 in IH-treated cell function and its associated signaling. Human umbilical vein endothelial cells (HUVECs) were randomly exposed to IH or normoxia for 0, 2, 4 and 6 h. Western blotting was used to detect the expression pattern of target gene proteins [angiotensin 1 receptor (AT1R), p-ERK1/2, p-p38MAPK, MyD88 and TRAF6], and the relationships among these target genes down-regulated by the corresponding inhibitors were studied. Finally, the influence of these target genes on proliferation of HUVECs was also assessed by EdU analysis. Protein levels of AT1R, TRAF6 and p-ERK1/2 were increased after IH exposure, with a slight rise in MyD88 and a dynamic change in p-p38MAPK. The down-regulation of TRAF6 by siRNA reduced ERK1/2 phosphorylation during IH without any effects on AT1R. Blockade of AT1R with valsartan decreased TRAF6 and p-ERK1/2 protein expression after IH exposure. ERK1/2 inhibition with PD98059 suppressed only AT1R expression. IH promoted HUVECs proliferation, which was significantly suppressed by the inhibition of TRAF6, AT1R and ERK1/2. The findings demonstrate that TRAF6 regulates the proliferation of HUVECs exposed to short-term IH by modulating cell signaling involving ERK1/2 downstream of AT1R. Targeting the AT1R-TRAF6-p-ERK1/2 signaling pathway might be helpful in restoring endothelial function.
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Affiliation(s)
- Jin Shang
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Respiratory Disease of the Ministry of Health, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Xue-Ling Guo
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Respiratory Disease of the Ministry of Health, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Yan Deng
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Respiratory Disease of the Ministry of Health, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Xiao Yuan
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Respiratory Disease of the Ministry of Health, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Hui-Guo Liu
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Respiratory Disease of the Ministry of Health, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
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