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Patil RP, Kumar N, Kaur A, Munian RK, Bhattacharya B, Ganesh S, Parihar R. Retinal vascular pathology in a mouse model of Lafora progressive myoclonus epilepsy. Neurosci Res 2024; 204:58-63. [PMID: 38458494 DOI: 10.1016/j.neures.2024.02.004] [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: 08/10/2023] [Revised: 02/20/2024] [Accepted: 02/29/2024] [Indexed: 03/10/2024]
Abstract
Neurodegenerative diseases (ND) affect distinct populations of neurons and manifest various clinical and pathological symptoms. A subset of ND prognoses has been linked to vascular risk factors. Consequently, the current study investigated retinal vascular abnormalities in a murine model of Lafora neurodegenerative disease (LD), a fatal and genetic form of progressive myoclonus epilepsy that affects children. Here, arterial rigidity was evaluated by measuring pulse wave velocity and vasculature deformations in the retina. Our findings in the LD mouse model indicate altered pulse wave velocity, retinal vascular thinning, and convoluted retinal arteries.
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Affiliation(s)
- Ruchira Pranay Patil
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology, Kanpur, India
| | - Nitin Kumar
- Central Experimental Animal Facility, Indian Institute of Technology, Kanpur, India
| | - Arveen Kaur
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology, Kanpur, India
| | - Rajendra Kumar Munian
- Department of Mechanical Engineering, Indian Institute of Technology, Kanpur, India; Department of Mechanical Engineering, Indian Institute of Technology Ropar, India
| | - Bishakh Bhattacharya
- Department of Mechanical Engineering, Indian Institute of Technology, Kanpur, India
| | - Subramaniam Ganesh
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology, Kanpur, India; Central Experimental Animal Facility, Indian Institute of Technology, Kanpur, India; The Mehta Family Centre for Engineering in Medicine, Indian Institute of Technology Kanpur, India.
| | - Rashmi Parihar
- Central Experimental Animal Facility, Indian Institute of Technology, Kanpur, India.
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2
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Chen L, Jiang C, Xu Q, Jin J, A S, Wang X, Li X, Hu Y, Sun H, Lu X, Duan S, Gao Z, Wang W, Wang Y. Biphasic release of betamethasone from an injectable HA hydrogel implant for alleviating lumbar disc herniation induced sciatica. Acta Biomater 2024; 176:173-189. [PMID: 38244658 DOI: 10.1016/j.actbio.2024.01.016] [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: 06/08/2023] [Revised: 12/17/2023] [Accepted: 01/11/2024] [Indexed: 01/22/2024]
Abstract
Epidural steroid injection (ESI) is a common therapeutic approach for managing sciatica caused by lumbar disc herniation (LDH). However, the short duration of therapeutic efficacy and the need for repeated injections pose challenges in LDH treatment. The development of a controlled delivery system capable of prolonging the effectiveness of ESI and reducing the frequency of injections, is highly significant in LDH clinical practice. In this study, we utilized a thiol-ene click chemistry to create a series of injectable hyaluronic acid (HA) based release systems loaded with diphasic betamethasone, including betamethasone dipropionate (BD) and betamethasone 21-phosphate disodium (BP) (BD/BP@HA). BD/BP@HA hydrogel implants demonstrated biocompatibility and biodegradability to matched neuronal tissues, avoiding artificial compression following injection. The sustained release of betamethasone from BD/BP@HA hydrogels effectively inhibited both acute and chronic neuroinflammation by suppressing the nuclear factor kappa-B (NF-κB) pathway. In a mouse model of LDH, the epidural administration of BD/BP@HA efficiently alleviated LDH-induced sciatica for at least 10 days by inhibiting the activation of macrophages and microglia in dorsal root ganglion and spinal dorsal horn, respectively. The newly developed HA hydrogels represent a valuable platform for achieving sustained drug release. Additionally, we provide a simple paradigm for fabricating BD/BP@HA for epidural injection, demonstrating greater and sustained efficiency in alleviating LDH-induced sciatica compared to traditional ESI and displaying potentials for clinical translation. This system has the potential to revolutionize drug delivery for co-delivery of both soluble and insoluble drugs, thereby making a significant impact in the pharmaceutical industry. STATEMENT OF SIGNIFICANCE: Lumbar disc herniation (LDH) is a common degenerative disorder leading to sciatica and spine surgery. Although epidural steroid injection (ESI) is routinely used to alleviate sciatica, the efficacy is short and repeated injections are required. There remains challenging to prolong the efficacy of ESI. Herein, an injectable hyaluronic acid (HA) hydrogel implant by crosslinking acrylated-modified HA (HA-A) with thiol-modified HA (HA-SH) was designed to achieve a biphasic release of betamethasone. The hydrogel showed biocompatibility and biodegradability to match neuronal tissues. Notably, compared to traditional ESI, the hydrogel better alleviated sciatica in vivo by synergistically inhibiting the neuroinflammation in central and peripheral nervous systems. We anticipate the injectable HA hydrogel implant has the potential for clinical translation in treating LDH-induced sciatica.
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Affiliation(s)
- Lunhao Chen
- Spine Lab, Department of Orthopedic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Chao Jiang
- Spine Lab, Department of Orthopedic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Qian Xu
- The Charles Institute of Dermatology, School of Medicine, University College Dublin, Dublin D04V1W8, Ireland; School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, Zhejiang 325000, China
| | - Jiale Jin
- Spine Lab, Department of Orthopedic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Sigen A
- School of Medicine, Anhui University of Science and Technology, Huainan, China; The Charles Institute of Dermatology, School of Medicine, University College Dublin, Dublin D04V1W8, Ireland
| | - Xi Wang
- The Charles Institute of Dermatology, School of Medicine, University College Dublin, Dublin D04V1W8, Ireland
| | - Xiaolin Li
- The Charles Institute of Dermatology, School of Medicine, University College Dublin, Dublin D04V1W8, Ireland
| | - Yaling Hu
- Liangzhu Laboratory, Zhejiang University Medical Center, MOE Frontier Science Center for Brain Science and Brain-machine Integration, State Key Laboratory of Brain-machine Intelligence, Zhejiang University, Hangzhou 311121, China; NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Pancreatic Diseases, The First Affiliated Hospital, University School of Medicine, Hangzhou 310003, China
| | - Huankun Sun
- Zhejiang Provincial Key Laboratory of Pancreatic Diseases, The First Affiliated Hospital, University School of Medicine, Hangzhou 310003, China
| | - Xuan Lu
- Spine Lab, Department of Orthopedic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Shumin Duan
- Liangzhu Laboratory, Zhejiang University Medical Center, MOE Frontier Science Center for Brain Science and Brain-machine Integration, State Key Laboratory of Brain-machine Intelligence, Zhejiang University, Hangzhou 311121, China; NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University, Hangzhou 310058, China
| | - Zhihua Gao
- Liangzhu Laboratory, Zhejiang University Medical Center, MOE Frontier Science Center for Brain Science and Brain-machine Integration, State Key Laboratory of Brain-machine Intelligence, Zhejiang University, Hangzhou 311121, China; NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University, Hangzhou 310058, China.
| | - Wenxin Wang
- Research and Clinical Translation Center of Gene Medicine and Tissue Engineering, School of Public Health, Anhui University of Science and Technology, Huainan, China; School of Medicine, Anhui University of Science and Technology, Huainan, China; The Charles Institute of Dermatology, School of Medicine, University College Dublin, Dublin D04V1W8, Ireland.
| | - Yue Wang
- Spine Lab, Department of Orthopedic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China.
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Green TRF, Murphy SM, Rowe RK. Comparisons of quantitative approaches for assessing microglial morphology reveal inconsistencies, ecological fallacy, and a need for standardization. Sci Rep 2022; 12:18196. [PMID: 36307475 PMCID: PMC9616881 DOI: 10.1038/s41598-022-23091-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 10/25/2022] [Indexed: 12/31/2022] Open
Abstract
Microglial morphology is used to measure neuroinflammation and pathology. For reliable inference, it is critical that microglial morphology is accurately quantified and that results can be easily interpreted and compared across studies and laboratories. The process through which microglial morphology is quantified is a key methodological choice and little is known about how this choice may bias conclusions. We applied five of the most commonly used ImageJ-based methods for quantifying the microglial morphological response to a stimulus to identical photomicrographs and individual microglial cells isolated from these photomicrographs, which allowed for direct comparisons of results generated using these approaches. We found a lack of comparability across methods that analyzed full photomicrographs, with significant discrepancies in results among the five methods. Quantitative methods to analyze microglial morphology should be selected based on several criteria, and combinations of these methods may give the most biologically accurate representation of microglial morphology.
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Affiliation(s)
- Tabitha R. F. Green
- grid.134563.60000 0001 2168 186XDepartment of Child Health, University of Arizona College of Medicine-Phoenix, Phoenix, AZ USA ,grid.266190.a0000000096214564Department of Integrative Physiology, University of Colorado, 2860 Wilderness Place, Boulder, CO 80301 USA
| | - Sean M. Murphy
- grid.134563.60000 0001 2168 186XDepartment of Child Health, University of Arizona College of Medicine-Phoenix, Phoenix, AZ USA
| | - Rachel K. Rowe
- grid.134563.60000 0001 2168 186XDepartment of Child Health, University of Arizona College of Medicine-Phoenix, Phoenix, AZ USA ,grid.266190.a0000000096214564Department of Integrative Physiology, University of Colorado, 2860 Wilderness Place, Boulder, CO 80301 USA
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Green TRF, Murphy SM, Moreno-Montano MP, Audinat E, Rowe RK. Reactive morphology of dividing microglia following kainic acid administration. Front Neurosci 2022; 16:972138. [PMID: 36248637 PMCID: PMC9556904 DOI: 10.3389/fnins.2022.972138] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 09/02/2022] [Indexed: 11/13/2022] Open
Abstract
The microglial response to a pathological microenvironment is hallmarked by a change in cellular morphology. Following a pathological stimulus, microglia become reactive and simultaneously divide to create daughter cells. Although a wide array of microglial morphologies has been observed, the exact functions of these distinct morphologies are unknown, as are the morphology and reactivity status of dividing microglia. In this study, we used kainic acid to trigger microglial activation and cell division. Following a cortical kainic acid injection, microglial morphology and proliferation were examined at 3 days post-injection using immunohistochemistry for ionized calcium binding adapter molecule 1 (Iba1) to stain for microglia, and KI67 as a marker of cell division. Individual microglial cells were isolated from photomicrographs and skeletal and fractal analyses were used to examine cell size and spatial complexity. We examined the morphology of microglia in both wildtype and microglia-specific tumor necrosis factor (TNF)-α knockout mice. Data were analyzed using generalized linear mixed models or a two-way ANOVA. We found that dividing microglia had a more reactive morphology (larger cell body area, longer cell perimeter, and less ramification) compared to microglia that were not dividing, regardless of microglial release of TNF-α. However, we also observed dividing microglia with a complex, more ramified morphology. Changes in microglial morphology and division were greatest near the kainic acid injection site. This study uses robust and quantitative techniques to better understand microglial cell division, morphology, and population dynamics, which are essential for the development of novel therapeutics that target microglia.
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Affiliation(s)
- Tabitha R. F. Green
- Department of Child Health, University of Arizona College of Medicine - Phoenix, Phoenix, AZ, United States
| | - Sean M. Murphy
- Department of Child Health, University of Arizona College of Medicine - Phoenix, Phoenix, AZ, United States
| | - Maria P. Moreno-Montano
- Institute of Functional Genomics (IGF), University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Etienne Audinat
- Institute of Functional Genomics (IGF), University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Rachel K. Rowe
- Department of Child Health, University of Arizona College of Medicine - Phoenix, Phoenix, AZ, United States
- Department of Integrative Physiology, University of Colorado, Boulder, CO, United States
- *Correspondence: Rachel K. Rowe,
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5
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Inflammation in pediatric epilepsies: Update on clinical features and treatment options. Epilepsy Behav 2022; 131:107959. [PMID: 33867302 DOI: 10.1016/j.yebeh.2021.107959] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 03/22/2021] [Accepted: 03/24/2021] [Indexed: 02/08/2023]
Abstract
The role of inflammation is increasingly recognized in triggering or sustaining epileptic activity. In the last decades, increasing research has provided definite evidence to support the link between immunity, inflammatory process, and epilepsy. Neuro- and systemic inflammation play a pivotal role in driving epileptogenesis through different pathogenetic mechanisms: the activation of innate immunity in glia, neurons, and microvasculature, the brain mediated by blood-brain barrier (BBB) impairment, and the imbalance of pro- and anti-inflammatory molecules produced by both arms of immunity. More recently, research has focused on the adverse effects of maternal or early-life immune activation and cytokine imbalance on fetal neurodevelopment and postnatal epilepsy. A complex crosstalk between the immune and nervous system, and a crucial interplay of genetic, epigenetic, and environmental factors may influence structures and functions of the developing brain. A better understanding of the inflammatory process in promoting epilepsy implies that targeting specific pathways may be effective in seizure control. Multiple targets have been identified so far, and several antiseizure interventions are obtained by inhibiting inflammatory signaling or protecting/restoring BBB. All this evidence has changed the field of epilepsy research and neuropharmacology. Further developments and new treatments will rapidly emerge to improve seizure management in inflammation-related epilepsies. This article is part of the Special Issue "Severe Infantile Epilepsies".
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6
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Reconnoitering the transformative journey of minocycline from an antibiotic to an antiepileptic drug. Life Sci 2022; 293:120346. [PMID: 35065989 DOI: 10.1016/j.lfs.2022.120346] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 01/04/2022] [Accepted: 01/16/2022] [Indexed: 12/20/2022]
Abstract
Minocycline, a second-generation tetracycline antibiotic is being widely tested in animals as well as clinical settings for the management of multiple neurological disorders. The drug has shown to exert protective action in a multitude of neurological disorders including spinal-cord injury, stroke, multiple sclerosis, amyotrophic lateral sclerosis, Huntington's disease, and Parkinson's disease. Being highly lipophilic, minocycline easily penetrates the blood brain barrier and is claimed to have excellent oral absorption (~100% bioavailability). Minocycline possesses anti-inflammatory, immunomodulatory, and anti-apoptotic properties, thereby supporting its use in treating neurological disorders. The article henceforth reviews all the recent advances in the transformation of this antibiotic into a potential antiepileptic/antiepileptogenic agent. The article also gives an account of all the clinical trials undertaken till now validating the antiepileptic potential of minocycline. Based on the reported studies, minocycline seems to be an important molecule for treating epilepsy. However, the practical therapeutic implementations of this molecule require extensive mechanism-based in-vitro (cell culture) and in-vivo (animal models) studies followed by its testing in randomized, placebo controlled and double-blind clinical trials in large population as well as in different form of epilepsies.
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Ismail FS, Corvace F, Faustmann PM, Faustmann TJ. Pharmacological Investigations in Glia Culture Model of Inflammation. Front Cell Neurosci 2022; 15:805755. [PMID: 34975415 PMCID: PMC8716582 DOI: 10.3389/fncel.2021.805755] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Accepted: 11/26/2021] [Indexed: 12/11/2022] Open
Abstract
Astrocytes and microglia are the main cell population besides neurons in the central nervous system (CNS). Astrocytes support the neuronal network via maintenance of transmitter and ion homeostasis. They are part of the tripartite synapse, composed of pre- and postsynaptic neurons and perisynaptic astrocytic processes as a functional unit. There is an increasing evidence that astroglia are involved in the pathophysiology of CNS disorders such as epilepsy, autoimmune CNS diseases or neuropsychiatric disorders, especially with regard to glia-mediated inflammation. In addition to astrocytes, investigations on microglial cells, the main immune cells of the CNS, offer a whole network approach leading to better understanding of non-neuronal cells and their pathological role in CNS diseases and treatment. An in vitro astrocyte-microglia co-culture model of inflammation was developed by Faustmann et al. (2003), which allows to study the endogenous inflammatory reaction and the cytokine expression under drugs in a differentiated manner. Commonly used antiepileptic drugs (e.g., levetiracetam, valproic acid, carbamazepine, phenytoin, and gabapentin), immunomodulatory drugs (e.g., dexamethasone and interferon-beta), hormones and psychotropic drugs (e.g., venlafaxine) were already investigated, contributing to better understanding mechanisms of actions of CNS drugs and their pro- or anti-inflammatory properties concerning glial cells. Furthermore, the effects of drugs on glial cell viability, proliferation and astrocytic network were demonstrated. The in vitro astrocyte-microglia co-culture model of inflammation proved to be suitable as unique in vitro model for pharmacological investigations on astrocytes and microglia with future potential (e.g., cancer drugs, antidementia drugs, and toxicologic studies).
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Affiliation(s)
- Fatme Seval Ismail
- Department of Neurology, University Hospital Knappschaftskrankenhaus Bochum, Ruhr University Bochum, Bochum, Germany
| | - Franco Corvace
- Department of Neuroanatomy and Molecular Brain Research, Ruhr University Bochum, Bochum, Germany
| | - Pedro M Faustmann
- Department of Neuroanatomy and Molecular Brain Research, Ruhr University Bochum, Bochum, Germany
| | - Timo Jendrik Faustmann
- Department of Psychiatry and Psychotherapy, Medical Faculty, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
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Yu H, He B, Han X, Yan T. Rufinamide (RUF) suppresses inflammation and maintains the integrity of the blood-brain barrier during kainic acid-induced brain damage. Open Life Sci 2021; 16:845-855. [PMID: 34514163 PMCID: PMC8389504 DOI: 10.1515/biol-2021-0090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 07/14/2021] [Accepted: 07/16/2021] [Indexed: 11/15/2022] Open
Abstract
Rufinamide (RUF) is a structurally unique anti-epileptic drug, but its protective mechanism against brain injury remains unclear. In the present study, we validated how the RUF protected mice with kainic acid (KA)-induced neuronal damage. To achieve that, a mouse epilepsy model was established by KA intraperitoneal injection. After Nissl staining, although there was a significant reduction in Nissl bodies in mice treated with KA, 40, 80, and 120 mg/kg, RUF significantly reduced KA-induced neuronal damage, in a dose-dependent manner. Among them, 120 mg/kg RUF was most pronounced. Immunohistochemistry (IHC) and western blot analysis showed that RUF inhibited the IBA-1 overexpression caused by KA to block microglia cell overactivation. Further, RUF treatment partially reversed neuroinflammatory cytokine (IL-1β, TNFα, HMGB1, and NLRP3) overexpression in mRNA and protein levels in KA mice. Moreover, although KA stimulation inhibited the expression of tight junctions, RUF treatment significantly upregulated expression of tight junction proteins (occludin and claudin 5) in both mRNA and protein levels in the brain tissues of KA mice. RUF inhibited the overactivation of microglia, suppressed the neuroinflammatory response, and reduced the destruction of blood-brain barrier, thereby alleviating the excitatory nerve damage of the KA-mice.
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Affiliation(s)
- Huaxu Yu
- General Surgery Department, Changsha Hospital of Hunan Normal University, No. 70, Lushan Road, Changsha 410000, Hunan, China
| | - Bin He
- General Surgery Department, Changsha Hospital of Hunan Normal University, No. 70, Lushan Road, Changsha 410000, Hunan, China
| | - Xu Han
- General Surgery Department, Changsha Hospital of Hunan Normal University, No. 70, Lushan Road, Changsha 410000, Hunan, China
| | - Ting Yan
- Department of Clinical Skills Training Center of ZhuJiang Hospital, ZhuJiang Hospital of Southern Medical University, Guangzhou 510282, China
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Yang B, Liang RS, Wu XY, Lin YJ. LncRNA TUG1 inhibits neuronal apoptosis in status epilepticus rats via targeting the miR-421/mTOR axis. Cell Signal 2020; 76:109787. [PMID: 33007387 DOI: 10.1016/j.cellsig.2020.109787] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 09/18/2020] [Accepted: 09/18/2020] [Indexed: 02/07/2023]
Abstract
Status epilepticus (SE) induces apoptosis of hippocampal neurons. However, the underlying mechanism in SE is not fully understood. Recently, lncRNA TUG1 is reported as a significant mediator in neuronal development. In present study, we aimed to investigate whether lncRNA TUG1 induces apoptosis of hippocampal neurons in SE rat models. TUG1 expression in serum of normal volunteers and SE patients, SE rats and neurons with epileptiform discharge was detected. SE rat model was established and intervened with TUG1 to evaluate hippocampal neuronal apoptosis. The experiments in vitro were further performed in neurons with epileptiform discharge to verify the effects of TUG1 on neuronal apoptosis of SE rats. The downstream mechanism of TUG1 was predicted and verified. miR-421 was intervened to perform the rescue experiments. Levels of oxidative stress and inflammation-related factors and mTOR pathway-related proteins in SE rats and hippocampal neurons were detected. TUG1 was highly expressed in serum of SE patients, SE rats and neurons with epileptiform discharge. Inhibition of TUG1 relieved pathological injury, oxidative stress and inflammation and reduced neuronal apoptosis in SE rats, which were further verified in hippocampal neurons. TUG1 upregulated TIMP2 expression by targeting miR-421. Overexpressed miR-421 inhibited hippocampal neuronal apoptosis. TUG1 knockout inactivated the mTOR pathway via the miR-421/TIMP2 axis to relieve neuronal apoptosis, oxidative stress and inflammation in SE rats and hippocampal neurons. Taken together, these findings showed that downregulation of lncRNA TUG1 inhibited apoptosis of hippocampal neurons in SE rats, and attenuated oxidative stress and inflammation damage through regulating the miR-421/mTOR axis.
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Affiliation(s)
- Bin Yang
- Affiliated Union Hospital of Fujian Medical University, Department of Neurosurgery, Fuzhou, Fujian, China
| | - Ri-Sheng Liang
- Affiliated Union Hospital of Fujian Medical University, Department of Neurosurgery, Fuzhou, Fujian, China.
| | - Xi-Yao Wu
- Affiliated Union Hospital of Fujian Medical University, Department of Neurosurgery, Fuzhou, Fujian, China
| | - Yao-Jing Lin
- Affiliated Union Hospital of Fujian Medical University, Department of Neurosurgery, Fuzhou, Fujian, China
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Yang N, Zhang Y, Wang JT, Chen C, Song Y, Liang JM, Ma DH, Zhang YF. Effects of Dexamethasone on Remodeling of the Hippocampal Synaptic Filamentous Actin Cytoskeleton in a Model of Pilocarpine-induced Status Epilepticus. Int J Med Sci 2020; 17:1683-1691. [PMID: 32714071 PMCID: PMC7378655 DOI: 10.7150/ijms.44927] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 06/18/2020] [Indexed: 12/28/2022] Open
Abstract
The filamentous actin (F-actin) cytoskeleton is progressively damaged after status epilepticus (SE), which is related to delayed neuronal death, aberrant recurrent circuits and epileptogenesis. Glucocorticoids regulate dendritic spine remodeling by acting on glucocorticoid receptors and the dynamics of the F-actin cytoskeleton. Our previous study showed that administration of dexamethasone (DEX) in the latent period of the pilocarpine epileptic model reduces damage to the hippocampal filamentous actin cytoskeleton and the loss of hippocampal neurons and aids in maintaining the synaptic structures, but it is not sufficient to stop epileptogenesis. In this work, we focused on the role of glucocorticoids in regulating the hippocampal F-actin cytoskeleton during SE. We examined the abundance of synaptic F-actin, analyzed the hippocampal F-actin/G-actin (F/G) ratio and pCofilin, and evaluated the number of hippocampal neurons and pre/postsynaptic markers in pilocarpine-induced status epilepticus mice with or without administration of dexamethasone (DEX). We found that the latency of Stage 3 seizures increased, the mortality decreased, the damage to the synaptic F-actin cytoskeleton in the hippocampal subfields was significantly attenuated, and a greater number of postsynaptic structures were retained in the hippocampal subfields after treatment with DEX. These results indicate that treatment with dexamethasone stabilizes the synaptic F-actin cytoskeleton and reduces the damage to the brain due to SE. This approach is expected to be beneficial in alleviating delayed neuron damage and the process of epileptogenesis.
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Affiliation(s)
- Nuo Yang
- Department of Pediatric Neurology, The First Hospital of Jilin University, Changchun, Jilin Province 130021, PR China.,Department of Neurology, The First Hospital of Jilin University, Changchun, Jilin Province 130021, PR China
| | - Yan Zhang
- College of Life Sciences, Jilin University; Jilin Province, 130021, PR China
| | - Jiang-Tao Wang
- Department of Pediatric Neurology, The First Hospital of Jilin University, Changchun, Jilin Province 130021, PR China
| | - Chen Chen
- Department of Pediatric Neurology, The First Hospital of Jilin University, Changchun, Jilin Province 130021, PR China
| | - Yan Song
- Nursing College, Beihua University, 3999 Huashan Road, Jilin 132013, PR China
| | - Jian-Min Liang
- Department of Pediatric Neurology, The First Hospital of Jilin University, Changchun, Jilin Province 130021, PR China
| | - Di-Hui Ma
- Department of Neurology, The First Hospital of Jilin University, Changchun, Jilin Province 130021, PR China
| | - Yan-Feng Zhang
- Department of Pediatric Neurology, The First Hospital of Jilin University, Changchun, Jilin Province 130021, PR China
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