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Xue H, Ding Z, Chen X, Yang X, Jia Y, Zhao P, Wu Z. Dexmedetomidine Improves Long-term Neurological Outcomes by Promoting Oligodendrocyte Genesis and Myelination in Neonatal Rats Following Hypoxic-ischemic Brain Injury. Mol Neurobiol 2024:10.1007/s12035-024-04564-z. [PMID: 39496877 DOI: 10.1007/s12035-024-04564-z] [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: 07/19/2024] [Accepted: 10/18/2024] [Indexed: 11/06/2024]
Abstract
Neonatal hypoxic-ischemic brain injury (HIBI) can lead to white matter damage, which significantly contributes to cognitive dysfunction, emotional disorders, and sensorimotor impairments. Although dexmedetomidine enhances neurobehavioral outcomes, its impact on oligodendrocyte genesis and myelination following hypoxic-ischemic events, as well as the underlying mechanisms, remain poorly understood. Dexmedetomidine was administered 15 min post-HIBI. We assessed neurobehavioral deficits using various tests: surface righting, negative geotaxis, forelimb grip strength, cliff avoidance, sensory reflexes, novel object recognition, T-maze, and three-chamber social interaction. We also investigated the relationship between myelination and neurobehavioral outcomes. Measurements included oligodendrocyte precursor cell (OPC) proliferation and survival 24 h post-injury, early myelination, and oligodendrocyte differentiation by postnatal day 14. Furthermore, we evaluated microglial activation towards the M2 phenotype and the extent of neuroinflammation during the acute phase. Dexmedetomidine significantly ameliorated long-term neurological deficits caused by HIBI. Pearson linear regression analysis revealed a strong correlation between long-term neurological outcomes and myelin maturity. The treatment notably mitigated the long-term deterioration of myelin formation and maturation following HIBI. This protective effect was primarily due to enhanced OPC proliferation and survival post-HIBI during the acute phase and, to a lesser extent, to the modulation of microglial activity towards the M2 phenotype and a reduction in neuroinflammation. Dexmedetomidine offers substantial protection against long-term neurobehavioral disabilities induced by HIBI, primarily by revitalizing the impaired survival and maturation of oligodendrocyte progenitor cells and promoting myelination.
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Affiliation(s)
- Hang Xue
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, 110004, China
| | - Zixuan Ding
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, 110004, China
| | - Xiaoyan Chen
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, 110004, China
| | - Xu Yang
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, 110004, China
| | - Yufei Jia
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, 110004, China
| | - Ping Zhao
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, 110004, China
| | - Ziyi Wu
- Department of Anesthesiology, Shengjing Hospital of China Medical University, Shenyang, 110004, China.
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Peng D, Liu T, Lu H, Zhang L, Chen H, Huang Y, Hu B, Zhang Q. Intranasal delivery of engineered extracellular vesicles loaded with miR-206-3p antagomir ameliorates Alzheimer's disease phenotypes. Theranostics 2024; 14:7623-7644. [PMID: 39659569 PMCID: PMC11626949 DOI: 10.7150/thno.103596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2024] [Accepted: 10/25/2024] [Indexed: 12/12/2024] Open
Abstract
Rationale: The level of miR-206-3p in the plasma and temporal cortex is increased in Alzheimer's disease (AD) patients. miR-206-3p antagomir injected into hippocampus ameliorates cognitive deficits by enhancing the level of BDNF. However, the trauma caused by brain injection and susceptibility to degradation limit its application. Methods: To overcome these challenges, we constructed engineered extracellular vesicles derived from mesenchymal stem cell (MSC-EVs) loaded with miR-206-3p antagomir (MSC-EVs-anta) by electroporation technology, and explored the therapeutic effects of MSC-EVs-anta delivered by intranasal administration on AD mice. Transcriptome sequencing and LC-MS/MS proteomic analysis were employed to disclose the mechanism underlying the attenuation of AD phenotypes by MSC-EVs-anta. Results: MSC-EVs-anta had favorable neuroprotection by promoting neurite outgrowth in vitro. Following intranasal administration, MSC-EVs-anta improved learning and memory deficits, promoted hippocampal neurogenesis and synaptic plasticity, and alleviated Aβ deposition. Compared with MSC-EVs or miR-206-3p antagomir alone, MSC-EVs-anta showed superior therapeutic effects. Mechanistically, MSC-EVs-anta significantly upregulated brain-derived neurotrophic factor (BDNF) in AD mice, and activated the BDNF/TrkB signaling pathway. The data from two-omics analyses demonstrated that the differentially expressed proteins and genes significantly regulated by MSC-EVs-anta were primarily enriched in the pathways involved in neurogenesis and synapse. Conclusions: Our findings highlight the intranasal administration of MSC-EVs-anta as a promising strategy for the treatment of AD.
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Affiliation(s)
- Dong Peng
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangdong Basic Research Center of Excellence for Natural Bioactive Molecules and Discovery of Innovative Drugs, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Department of Cell Biology & Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Department of Laboratory Medicine, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, China
| | - Tingting Liu
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangdong Basic Research Center of Excellence for Natural Bioactive Molecules and Discovery of Innovative Drugs, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Department of Cell Biology & Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
| | - Huahui Lu
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangdong Basic Research Center of Excellence for Natural Bioactive Molecules and Discovery of Innovative Drugs, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Department of Cell Biology & Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
| | - Lei Zhang
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangdong Basic Research Center of Excellence for Natural Bioactive Molecules and Discovery of Innovative Drugs, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Department of Cell Biology & Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
| | - Hongxia Chen
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangdong Basic Research Center of Excellence for Natural Bioactive Molecules and Discovery of Innovative Drugs, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Department of Cell Biology & Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Guangdong Provincial Key Laboratory of Bioengineering Medicine, National Engineering Research Center of Genetic Medicine, Jinan University, Guangzhou 510632, China
| | - Yadong Huang
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangdong Basic Research Center of Excellence for Natural Bioactive Molecules and Discovery of Innovative Drugs, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Department of Cell Biology & Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Guangdong Provincial Key Laboratory of Bioengineering Medicine, National Engineering Research Center of Genetic Medicine, Jinan University, Guangzhou 510632, China
| | - Bo Hu
- Department of Laboratory Medicine, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, China
| | - Qihao Zhang
- State Key Laboratory of Bioactive Molecules and Druggability Assessment, Guangdong Basic Research Center of Excellence for Natural Bioactive Molecules and Discovery of Innovative Drugs, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Department of Cell Biology & Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Guangdong Provincial Key Laboratory of Bioengineering Medicine, National Engineering Research Center of Genetic Medicine, Jinan University, Guangzhou 510632, China
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Shen H, Lu H, Mao L, Song L. Inhibition of cGAS attenuates neonatal hypoxic-ischemic encephalopathy via regulating microglia polarization and pyroptosis. Transl Pediatr 2024; 13:1378-1394. [PMID: 39263289 PMCID: PMC11384446 DOI: 10.21037/tp-24-148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Accepted: 08/15/2024] [Indexed: 09/13/2024] Open
Abstract
Background Neonatal hypoxic-ischemic encephalopathy (HIE) is a condition causing brain injury in newborns with unclear pathogenesis. Cyclic GMP-AMP synthase (cGAS)/stimulator of interferon genes (STING) signaling pathway and NOD-like receptor protein 3 (NLRP3) mediated pyroptosis are thought to be involved in the pathological process of HIE, but whether these two mechanisms act independently is still unknown. Therefore, we aim to clarify whether there is any interaction between these two pathways and thus synergistically affects the progression of HIE. Methods The HIE model of neonatal rats was established using the Rice-Vannucci method. The potential therapeutic effect of RU.521 targeting cGAS on HIE was explored through rescue experiment. Twenty-four hours after modeling was selected as observation point, sham + vehicle group, HIE + vehicle group and HIE + RU.521 group were established. A complete medium of BV2 cells was adjusted to a glucose-free medium, and the oxygen-glucose deprivation model was established after continuous hypoxia for 4 hours and reoxygenation for 12 to 24 hours. 2,3,5-triphenyl tetrazolium chloride staining was employed to detect ischemic cerebral infarction in rat brain tissue, and hematoxylin and eosin staining was used to observe tissue injury. Immunofluorescence was applied to monitor the expression of cGAS. Real-time quantitative polymerase chain reaction and western blot were utilized to detect the expression of messenger RNA and protein. Results cGAS expression was increased in brain tissues of neonatal rats with HIE, and mainly localized in microglia. RU.521 administration reduced infarct size and pathological damage in rat HIE. Moreover, blocking cGAS with RU.521 significantly reduced inflammatory conditions in the brain by down-regulating STING expression, decreasing NLRP3 inflammasome activation and reducing microglial pyroptosis both in vivo and in vitro. Besides, RU.521 promoted the switching of BV2 cells towards the M2 phenotype. Conclusions This study revealed a link between the cGAS/STING pathway and the NLRP3/GSDMD/pyroptosis pathway in neonatal HIE. Furthermore, the small molecule compound RU.521 can negatively regulate cGAS/STING/NLRP3/pyroptosis axis and promote M2 polarization in microglia, which provides a potential therapeutic strategy for the treatment of neuroinflammation in HIE.
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Affiliation(s)
- Haiyan Shen
- Department of Pediatrics, Nantong First People's Hospital (Affiliated Hospital 2 of Nantong University), Nantong, China
| | - Hongyi Lu
- Department of Pediatrics, Nantong First People's Hospital (Affiliated Hospital 2 of Nantong University), Nantong, China
| | - Liming Mao
- Department of Immunology, School of Medicine, Nantong University, Nantong, China
- Basic Medical Research Center, School of Medicine, Nantong University, Nantong, China
| | - Lei Song
- Department of Pediatrics, Nantong First People's Hospital (Affiliated Hospital 2 of Nantong University), Nantong, China
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Tomruk C, Şirin Tomruk C, Denizlioğlu B, Olukman M, Ercan G, Duman S, Köse T, Çetin Uyanıkgil EÖ, Uyanıkgil Y, Uysal A. Effects of apelin on neonatal brain neurogenesis in L-NAME-induced maternal preeclampsia. Sci Rep 2024; 14:19347. [PMID: 39164321 PMCID: PMC11335761 DOI: 10.1038/s41598-024-69326-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2024] [Accepted: 08/02/2024] [Indexed: 08/22/2024] Open
Abstract
The aim of this study was to investigate the possible protective effects of apelin, which is known to have antioxidant and anti-inflammatory effects, on changes in neurogenesis in newborns of pregnant rats with L-NAME-induced preeclampsia. Wistar albino female rats were divided into four experimental groups: Control, Apelin, Preeclampsia and Preeclampsia + Apelin. Blood pressure was measured on the 5th, 11th and 17th days of gestation, urine protein was analyzed from urine samples collected for 24 h on the 6th, 12th and 18th days and serum creatinine was analyzed from serum samples. Maternal kidney and placenta tissues were obtained to establish the preeclampsia model, and neonatal brain tissues including the cortex, hippocampus and cerebellum regions were obtained to investigate neurogenesis and examined by histological and immunohistochemical methods. The number of newborns, body weight and brain weight of the newborns were measured. eNOS, IL-10, nNOS and NO levels in the brain analyzed via ELISA. Mean arterial pressure, urine protein and serum creatinine increased in the preeclampsia. Newborn weight decreased in the Preeclampsia group, the values in the Preeclampsia + Apelin group were closer to the Control and Apelin groups. In the Preeclampsia group, edema and dilatation in the proximal and distal tubules of kidneys, perivillous fibrin deposition and increase in syncytial nodules of placenta were observed. VEGF immunoreactivity decreased and iNOS immunoreactivity increased in both kidney and placenta. In neonatal brain tissue examinations, cytotoxic edema accompanied by thinning of cortex, delayed migration and lower cell counts in the hippocampus, and increase in intercellular spaces and EGL thickening in the cerebellum were observed in the preeclampsia. Expression of NeuN, GFAP, MBP, IL-10, eNOS, nNOS and NO levels decreased, whereas expression of Iba-1 increased in the preeclampsia. In the Preeclampsia + Apelin group, these findings were similar to the Control and Apelin groups. Apelin administration was found to be beneficial for preventing the adverse consequences of preeclampsia, but further experimental and clinical studies are needed to better understand these effects.
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Affiliation(s)
- Canberk Tomruk
- Department of Histology and Embryology, Faculty of Medicine, Ege University, Bornova, İzmir, Türkiye
- Histology and Embryology, Samsun Training and Research Hospital, İlkadim, Samsun, Türkiye
| | - Cansın Şirin Tomruk
- Department of Histology and Embryology, Faculty of Medicine, Ege University, Bornova, İzmir, Türkiye
| | - Burcu Denizlioğlu
- Department of Medical Biochemistry, Faculty of Medicine, Ege University, Bornova, İzmir, Türkiye
- Emergency Medicine, Aydın State Hospital, Efeler, Aydın, Türkiye
| | - Murat Olukman
- Department of Medical Pharmacology, Faculty of Medicine, Ege University, Bornova, İzmir, Türkiye
| | - Gülinnaz Ercan
- Department of Medical Biochemistry, Faculty of Medicine, Ege University, Bornova, İzmir, Türkiye
| | - Soner Duman
- Department of Internal Medicine, Faculty of Medicine, Ege University, Bornova, İzmir, Türkiye
| | - Timur Köse
- Department of Biostatistics and Medical Informatics, Faculty of Medicine, Ege University, Bornova, İzmir, Türkiye
| | - Emel Öykü Çetin Uyanıkgil
- Department of Pharmaceutical Technology, Department of Biopharmaceutics and Pharmacokinetics, Faculty of Pharmacy, Ege University, Bornova, İzmir, Türkiye
| | - Yiğit Uyanıkgil
- Department of Histology and Embryology, Faculty of Medicine, Ege University, Bornova, İzmir, Türkiye.
| | - Ayşegül Uysal
- Department of Histology and Embryology, Faculty of Medicine, Ege University, Bornova, İzmir, Türkiye
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Zhang ZZ, Nasir A, Li D, Khan S, Bai Q, Yuan F. Effect of dexmedetomidine on ncRNA and mRNA profiles of cerebral ischemia-reperfusion injury in transient middle cerebral artery occlusion rats model. Front Pharmacol 2024; 15:1437445. [PMID: 39170713 PMCID: PMC11335533 DOI: 10.3389/fphar.2024.1437445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2024] [Accepted: 07/18/2024] [Indexed: 08/23/2024] Open
Abstract
Ischemic stroke poses a significant global health burden, with rapid revascularization treatments being crucial but often insufficient to mitigate ischemia-reperfusion (I/R) injury. Dexmedetomidine (DEX) has shown promise in reducing cerebral I/R injury, but its potential molecular mechanism, particularly its interaction with non-coding RNAs (ncRNAs), remains unclear. This study investigates DEX's therapeutic effect and potential molecular mechanisms in reducing cerebral I/R injury. A transient middle cerebral artery obstruction (tMACO) model was established to simulate cerebral I/R injury in adult rats. DEX was administered pre-ischemia and post-reperfusion. RNA sequencing and bioinformatic analyses were performed on the ischemic cerebral cortex to identify differentially expressed non-coding RNAs (ncRNAs) and mRNAs. The sequencing results showed 6,494 differentially expressed (DE) mRNA and 2698 DE circRNA between the sham and tMCAO (I/R) groups. Additionally, 1809 DE lncRNA, 763 DE mRNA, and 2795 DE circRNA were identified between the I/R group and tMCAO + DEX (I/R + DEX) groups. Gene ontology (GO) analysis indicated significant enrichment in multicellular biogenesis, plasma membrane components, and protein binding. KEGG analysis further highlighted the potential mechanism of DEX action in reducing cerebral I/R injury, with hub genes involved in inflammatory pathways. This study demonstrates DEX's efficacy in reducing cerebral I/R injury and offers insights into its brain-protective effects, especially in ischemic stroke. Further research is warranted to fully understand DEX's neuroprotective mechanisms and its clinical applications.
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Affiliation(s)
- Zhen Zhen Zhang
- Department of Anesthesiology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Abdul Nasir
- Department of Anesthesiology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
- Medical Research Center, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Dong Li
- Department of Anesthesiology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Suliman Khan
- Medical Research Center, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Qian Bai
- Department of Anesthesiology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
- Medical Research Center, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Feng Yuan
- Department of Anesthesiology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
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Cui C, Jiang X, Wang Y, Li C, Lin Z, Wei Y, Ni Q. Cerebral Hypoxia-Induced Molecular Alterations and Their Impact on the Physiology of Neurons and Dendritic Spines: A Comprehensive Review. Cell Mol Neurobiol 2024; 44:58. [PMID: 39105862 PMCID: PMC11303443 DOI: 10.1007/s10571-024-01491-4] [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: 05/28/2024] [Accepted: 07/15/2024] [Indexed: 08/07/2024]
Abstract
This article comprehensively reviews how cerebral hypoxia impacts the physiological state of neurons and dendritic spines through a series of molecular changes, and explores the causal relationship between these changes and neuronal functional impairment. As a severe pathological condition, cerebral hypoxia can significantly alter the morphology and function of neurons and dendritic spines. Specifically, dendritic spines, being the critical structures for neurons to receive information, undergo changes such as a reduction in number and morphological abnormalities under hypoxic conditions. These alterations further affect synaptic function, leading to neurotransmission disorders. This article delves into the roles of molecular pathways like MAPK, AMPA receptors, NMDA receptors, and BDNF in the hypoxia-induced changes in neurons and dendritic spines, and outlines current treatment strategies. Neurons are particularly sensitive to cerebral hypoxia, with their apical dendrites being vulnerable to damage, thereby affecting cognitive function. Additionally, astrocytes and microglia play an indispensable role in protecting neuronal and synaptic structures, regulating their normal functions, and contributing to the repair process following injury. These studies not only contribute to understanding the pathogenesis of related neurological diseases but also provide important insights for developing novel therapeutic strategies. Future research should further focus on the dynamic changes in neurons and dendritic spines under hypoxic conditions and their intrinsic connections with cognitive function.
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Affiliation(s)
- Chao Cui
- Hydrogen Medical Research Center, The Affiliated Taian City Central Hospital of Qingdao University, Taian, 271000, Shandong, China
| | - Xue Jiang
- Hydrogen Medical Research Center, The Affiliated Taian City Central Hospital of Qingdao University, Taian, 271000, Shandong, China
| | - Yumei Wang
- Hydrogen Medical Research Center, The Affiliated Taian City Central Hospital of Qingdao University, Taian, 271000, Shandong, China
| | - Chao Li
- Hydrogen Medical Research Center, The Affiliated Taian City Central Hospital of Qingdao University, Taian, 271000, Shandong, China
| | - Zhaochen Lin
- Hydrogen Medical Research Center, The Affiliated Taian City Central Hospital of Qingdao University, Taian, 271000, Shandong, China
| | - Youzhen Wei
- Hydrogen Medical Research Center, The Affiliated Taian City Central Hospital of Qingdao University, Taian, 271000, Shandong, China.
- Research Center for Translational Medicine & Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, 200000, China.
| | - Qingbin Ni
- Hydrogen Medical Research Center, The Affiliated Taian City Central Hospital of Qingdao University, Taian, 271000, Shandong, China.
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Qian H, Chen A, Lin D, Deng J, Gao F, Wei J, Wu X, Huang Y, Cai D, Chen X, Zheng X. Activation of the CD200/CD200R1 axis improves cognitive impairment by enhancing hippocampal neurogenesis via suppression of M1 microglial polarization and neuroinflammation in hypoxic-ischemic neonatal rats. Int Immunopharmacol 2024; 128:111532. [PMID: 38237226 DOI: 10.1016/j.intimp.2024.111532] [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: 08/31/2023] [Revised: 01/08/2024] [Accepted: 01/09/2024] [Indexed: 02/08/2024]
Abstract
Following hypoxic-ischemic brain damage (HIBD), there is a decline in cognitive function; however, there are no effective treatment strategies for this condition in neonates. This study aimed to evaluate the role of the cluster of differentiation 200 (CD200)/CD200R1 axis in cognitive function following HIBD using an established model of HIBD in postnatal day 7 rats. Western blotting analysis was conducted to evaluate the protein expression levels of CD200, CD200R1, proteins associated with the PI3K/Akt-NF-κB pathway, and inflammatory factors such as TNF-α, IL-1β, and IL-6 in the hippocampus. Additionally, double-immunofluorescence labeling was utilized to evaluate M1 microglial polarization and neurogenesis in the hippocampus. To assess the learning and memory function of the experimental rats, the Morris water maze (MWM) test was conducted. HIBDleads to a decrease in the expression of CD200 and CD200R1 proteins in the neonatal rat hippocampus, while simultaneously increasing the expression of TNF-α, IL-6, and IL-1β proteins, ultimately resulting in cognitive impairment. The administration of CD200Fc, a fusion protein of CD200, was found to enhance the expression of p-PI3K and p-Akt, but reduce the expression of p-NF-κB. Additionally, CD200Fc inhibited M1 polarization of microglia, reduced neuroinflammation, improved hippocampal neurogenesis, and mitigated cognitive impairment caused by HIBD in neonatal rats. In contrast, blocking the interaction between CD200 and CD200R1 with the anti-CD200R1 antibody (CD200R1 Ab) exerted the opposite effect. Furthermore, the PI3K specific activator, 740Y-P, significantly increased the expression of p-PI3K and p-Akt, but reduced p-NF-κB expression. It also inhibited M1 polarization of microglia, reduced neuroinflammation, and improved hippocampal neurogenesis and cognitive function in neonatal rats with HIBD. Our findings illustrate that activation of the CD200/CD200R1 axis inhibits the NF-κB-mediated M1 polarization of microglia to improve HIBD-induced cognitive impairment and hippocampal neurogenesis disorder via the PI3K/Akt signaling pathway.
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Affiliation(s)
- Haitao Qian
- Shengli Clinical Medical College of Fujian Medical University, Department of Anesthesiology, Fujian Provincial Hospital, Fuzhou, China
| | - Andi Chen
- Shengli Clinical Medical College of Fujian Medical University, Department of Anesthesiology, Fujian Provincial Hospital, Fuzhou, China
| | - Daoyi Lin
- Shengli Clinical Medical College of Fujian Medical University, Department of Anesthesiology, Fujian Provincial Hospital, Fuzhou, China
| | - Jianhui Deng
- Shengli Clinical Medical College of Fujian Medical University, Department of Anesthesiology, Fujian Provincial Hospital, Fuzhou, China
| | - Fei Gao
- Shengli Clinical Medical College of Fujian Medical University, Department of Anesthesiology, Fujian Provincial Hospital, Fuzhou, China
| | - Jianjie Wei
- Shengli Clinical Medical College of Fujian Medical University, Department of Anesthesiology, Fujian Provincial Hospital, Fuzhou, China
| | - Xuyang Wu
- College of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, China
| | - Yongxin Huang
- Shengli Clinical Medical College of Fujian Medical University, Department of Anesthesiology, Fujian Provincial Hospital, Fuzhou, China
| | - Dingliang Cai
- Shengli Clinical Medical College of Fujian Medical University, Department of Anesthesiology, Fujian Provincial Hospital, Fuzhou, China
| | - Xiaohui Chen
- Shengli Clinical Medical College of Fujian Medical University, Department of Anesthesiology, Fujian Provincial Hospital, Fuzhou, China.
| | - Xiaochun Zheng
- Shengli Clinical Medical College of Fujian Medical University, Department of Anesthesiology, Fujian Provincial Hospital, Fuzhou, China; Fujian Emergency Medical Center, Fujian Provincial Key Laboratory of Critical Care Medicine, Fujian Provincial Co-Constructed Laboratory of "Belt and Road", Fuzhou, China.
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