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Perez-Gianmarco L, Kukley M. Understanding the Role of the Glial Scar through the Depletion of Glial Cells after Spinal Cord Injury. Cells 2023; 12:1842. [PMID: 37508505 PMCID: PMC10377788 DOI: 10.3390/cells12141842] [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: 05/22/2023] [Revised: 06/30/2023] [Accepted: 07/11/2023] [Indexed: 07/30/2023] Open
Abstract
Spinal cord injury (SCI) is a condition that affects between 8.8 and 246 people in a million and, unlike many other neurological disorders, it affects mostly young people, causing deficits in sensory, motor, and autonomic functions. Promoting the regrowth of axons is one of the most important goals for the neurological recovery of patients after SCI, but it is also one of the most challenging goals. A key event after SCI is the formation of a glial scar around the lesion core, mainly comprised of astrocytes, NG2+-glia, and microglia. Traditionally, the glial scar has been regarded as detrimental to recovery because it may act as a physical barrier to axon regrowth and release various inhibitory factors. However, more and more evidence now suggests that the glial scar is beneficial for the surrounding spared tissue after SCI. Here, we review experimental studies that used genetic and pharmacological approaches to ablate specific populations of glial cells in rodent models of SCI in order to understand their functional role. The studies showed that ablation of either astrocytes, NG2+-glia, or microglia might result in disorganization of the glial scar, increased inflammation, extended tissue degeneration, and impaired recovery after SCI. Hence, glial cells and glial scars appear as important beneficial players after SCI.
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Affiliation(s)
- Lucila Perez-Gianmarco
- Achucarro Basque Center for Neuroscience, 48940 Leioa, PC, Spain
- Department of Neurosciences, University of the Basque Country, 48940 Leioa, PC, Spain
| | - Maria Kukley
- Achucarro Basque Center for Neuroscience, 48940 Leioa, PC, Spain
- IKERBASQUE Basque Foundation for Science, 48009 Bilbao, PC, Spain
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2
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Suzuki Y, Nakagawa S, Endo T, Sotome A, Yuan R, Asano T, Otsuguro S, Maenaka K, Iwasaki N, Kadoya K. High-Throughput Screening Assay Identifies Berberine and Mubritinib as Neuroprotection Drugs for Spinal Cord Injury via Blood-Spinal Cord Barrier Protection. Neurotherapeutics 2022; 19:1976-1991. [PMID: 36178590 PMCID: PMC9723073 DOI: 10.1007/s13311-022-01310-y] [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] [Accepted: 09/19/2022] [Indexed: 12/13/2022] Open
Abstract
Because the breakdown of the blood-brain spinal cord barrier (BBSCB) worsens many central nervous system (CNS) diseases, prevention of BBSCB breakdown has been a major therapeutic target, especially for spinal cord injury (SCI). However, effective drugs that protect BBSCB function have yet to be developed. The purpose of the current study was 1) to develop a high-throughput screening assay (HTSA) to identify candidate drugs to protect BBSCB function, 2) to identify candidate drugs from existing drugs with newly developed HTSA, and 3) to examine the therapeutic effects of candidate drugs on SCI. Our HTSA included a culture of immortalized human brain endothelial cells primed with candidate drugs, stress with H2O2, and evaluation of their viability. A combination of the resazurin-based assay with 0.45 mM H2O2 qualified as a reliable HTSA. Screening of 1,570 existing drugs identified 90 drugs as hit drugs. Through a combination of reproducibility tests, exclusion of drugs inappropriate for clinical translation, and dose dependency tests, berberine, mubritinib, and pioglitazone were identified as a candidate. An in vitro BBSCB functional test revealed that berberine and mubritinib, but not pioglitazone, protected BBSCB from oxygen-glucose deprivation and reoxygenation stress. Additionally, these two drugs minimized BBSCB breakdown 1 day after cervical SCI in mice. Furthermore, berberine and mubritinib reduced neuronal loss and improved gait performance 8 weeks after SCI. Collectively, the current study established a useful HTSA to identify potential neuroprotective drugs by maintaining BBSCB function and demonstrated the neuroprotective effect of berberine and mubritinib after SCI.
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Affiliation(s)
- Yuki Suzuki
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita 15 jo, Nishi 7 chome, Kita-ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Shinsuke Nakagawa
- Department of Pharmaceutical Care and Health Sciences, Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Takeshi Endo
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita 15 jo, Nishi 7 chome, Kita-ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Akihito Sotome
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita 15 jo, Nishi 7 chome, Kita-ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Rufei Yuan
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita 15 jo, Nishi 7 chome, Kita-ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Tsuyoshi Asano
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita 15 jo, Nishi 7 chome, Kita-ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Satoko Otsuguro
- Center for Research and Education On Drug Discovery, Department of Medical Pharmacology, Hokkaido University, Kita 12 jo, Nishi 6 chome, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan
| | - Katsumi Maenaka
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita 12 jo, Nishi 6 chome, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan
| | - Norimasa Iwasaki
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita 15 jo, Nishi 7 chome, Kita-ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Ken Kadoya
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Kita 15 jo, Nishi 7 chome, Kita-ku, Sapporo, Hokkaido, 060-8638, Japan.
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3
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Murcko R, Marchi N, Bailey D, Janigro D. Diagnostic biomarker kinetics: how brain-derived biomarkers distribute through the human body, and how this affects their diagnostic significance: the case of S100B. Fluids Barriers CNS 2022; 19:32. [PMID: 35546671 PMCID: PMC9092835 DOI: 10.1186/s12987-022-00329-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 04/19/2022] [Indexed: 11/22/2022] Open
Abstract
Blood biomarkers of neurological diseases are often employed to rule out or confirm the presence of significant intracranial or cerebrovascular pathology or for the differential diagnosis of conditions with similar presentations (e.g., hemorrhagic vs. embolic stroke). More widespread utilization of biomarkers related to brain health is hampered by our incomplete understanding of the kinetic properties, release patterns, and excretion of molecules derived from the brain. This is, in particular, true for S100B, an astrocyte-derived protein released across the blood–brain barrier (BBB). We developed an open-source pharmacokinetic computer model that allows investigations of biomarker’s movement across the body, the sources of biomarker’s release, and its elimination. This model was derived from a general in silico model of drug pharmacokinetics adapted for protein biomarkers. We improved the model’s predictive value by adding realistic blood flow values, organ levels of S100B, lymphatic and glymphatic circulation, and glomerular filtration for excretion in urine. Three key variables control biomarker levels in blood or saliva: blood–brain barrier permeability, the S100B partition into peripheral organs, and the cellular levels of S100B in astrocytes. A small contribution to steady-state levels of glymphatic drainage was also observed; this mechanism also contributed to the uptake of organs of circulating S100B. This open-source model can also mimic the kinetic behavior of other markers, such as GFAP or NF-L. Our results show that S100B, after uptake by various organs from the systemic circulation, can be released back into systemic fluids at levels that do not significantly affect the clinical significance of venous blood or salivary levels after an episode of BBB disruption.
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Affiliation(s)
| | - Nicola Marchi
- Laboratory of Cerebrovascular and Glia Research, Department of Neuroscience, Institute of Functional Genomics (UMR 5203 CNRS - U 1191 INSERM), University of Montpellier, Montpellier, France
| | - Damian Bailey
- Neurovascular Research Laboratory, Faculty of Life Sciences and Education, University of South Wales, Newport, UK
| | - Damir Janigro
- FloTBI Inc., Cleveland, OH, USA. .,Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, OH, USA.
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Nagai J, Baba R, Ohshima T. CRMPs Function in Neurons and Glial Cells: Potential Therapeutic Targets for Neurodegenerative Diseases and CNS Injury. Mol Neurobiol 2016; 54:4243-4256. [PMID: 27339876 DOI: 10.1007/s12035-016-0005-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2016] [Accepted: 06/14/2016] [Indexed: 12/19/2022]
Abstract
Neurodegeneration in the adult mammalian central nervous system (CNS) is fundamentally accelerated by its intrinsic neuronal mechanisms, including its poor regenerative capacity and potent extrinsic inhibitory factors. Thus, the treatment of neurodegenerative diseases faces many obstacles. The degenerative processes, consisting of axonal/dendritic structural disruption, abnormal axonal transport, release of extracellular factors, and inflammation, are often controlled by the cytoskeleton. From this perspective, regulators of the cytoskeleton could potentially be a therapeutic target for neurodegenerative diseases and CNS injury. Collapsin response mediator proteins (CRMPs) are known to regulate the assembly of cytoskeletal proteins in neurons, as well as control axonal growth and neural circuit formation. Recent studies have provided some novel insights into the roles of CRMPs in several inhibitory signaling pathways of neurodegeneration, in addition to its functions in neurological disorders and CNS repair. Here, we summarize the roles of CRMPs in axon regeneration and its emerging functions in non-neuronal cells, especially in inflammatory responses. We also discuss the direct and indirect targeting of CRMPs as a novel therapeutic strategy for neurological diseases.
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Affiliation(s)
- Jun Nagai
- Department of Life Science and Medical Bioscience, Graduate School of Advanced Science and Engineering, Waseda University, TWIns, 2-2 Wakamatsu-cho Shinjuku-ku, Tokyo, 162-8480, Japan.,Research Fellow of Japan Society for the Promotion of Science, Tokyo, Japan
| | - Rina Baba
- Department of Life Science and Medical Bioscience, Graduate School of Advanced Science and Engineering, Waseda University, TWIns, 2-2 Wakamatsu-cho Shinjuku-ku, Tokyo, 162-8480, Japan
| | - Toshio Ohshima
- Department of Life Science and Medical Bioscience, Graduate School of Advanced Science and Engineering, Waseda University, TWIns, 2-2 Wakamatsu-cho Shinjuku-ku, Tokyo, 162-8480, Japan.
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Zhang Y, Zhang ZG, Chopp M, Meng Y, Zhang L, Mahmood A, Xiong Y. Treatment of traumatic brain injury in rats with N-acetyl-seryl-aspartyl-lysyl-proline. J Neurosurg 2016; 126:782-795. [PMID: 28245754 DOI: 10.3171/2016.3.jns152699] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
OBJECTIVE The authors' previous studies have suggested that thymosin beta 4 (Tβ4), a major actin-sequestering protein, improves functional recovery after neural injury. N-acetyl-seryl-aspartyl-lysyl-proline (AcSDKP) is an active peptide fragment of Tβ4. Its effect as a treatment of traumatic brain injury (TBI) has not been investigated. Thus, this study was designed to determine whether AcSDKP treatment improves functional recovery in rats after TBI. METHODS Young adult male Wistar rats were randomly divided into the following groups: 1) sham group (no injury); 2) TBI + vehicle group (0.01 N acetic acid); and 3) TBI + AcSDKP (0.8 mg/kg/day). TBI was induced by controlled cortical impact over the left parietal cortex. AcSDKP or vehicle was administered subcutaneously starting 1 hour postinjury and continuously for 3 days using an osmotic minipump. Sensorimotor function and spatial learning were assessed using a modified Neurological Severity Score and Morris water maze tests, respectively. Some of the animals were euthanized 1 day after injury, and their brains were processed for measurement of fibrin accumulation and neuroinflammation signaling pathways. The remaining animals were euthanized 35 days after injury, and brain sections were processed for measurement of lesion volume, hippocampal cell loss, angiogenesis, neurogenesis, and dendritic spine remodeling. RESULTS Compared with vehicle treatment, AcSDKP treatment initiated 1 hour postinjury significantly improved sensorimotor functional recovery (Days 7-35, p < 0.05) and spatial learning (Days 33-35, p < 0.05), reduced cortical lesion volume, and hippocampal neuronal cell loss, reduced fibrin accumulation and activation of microglia/macrophages, enhanced angiogenesis and neurogenesis, and increased the number of dendritic spines in the injured brain (p < 0.05). AcSDKP treatment also significantly inhibited the transforming growth factor-β1/nuclear factor-κB signaling pathway. CONCLUSIONS AcSDKP treatment initiated 1 hour postinjury provides neuroprotection and neurorestoration after TBI, indicating that this small tetrapeptide has promising therapeutic potential for treatment of TBI. Further investigation of the optimal dose and therapeutic window of AcSDKP treatment for TBI and the associated underlying mechanisms is therefore warranted.
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Affiliation(s)
| | | | - Michael Chopp
- Neurology, Henry Ford Hospital, Detroit; and.,Department of Physics, Oakland University, Rochester, Michigan
| | | | - Li Zhang
- Neurology, Henry Ford Hospital, Detroit; and
| | | | - Ye Xiong
- Departments of 1 Neurosurgery and
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Wang Y, Gao Z, Zhang Y, Feng SQ, Liu Y, Shields LBE, Zhao YZ, Zhu Q, Gozal D, Shields CB, Cai J. Attenuated Reactive Gliosis and Enhanced Functional Recovery Following Spinal Cord Injury in Null Mutant Mice of Platelet-Activating Factor Receptor. Mol Neurobiol 2015; 53:3448-3461. [PMID: 26084439 DOI: 10.1007/s12035-015-9263-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Accepted: 05/28/2015] [Indexed: 12/11/2022]
Abstract
Platelet-activating factor (PAF) is a unique phosphoglycerine that mediates the biological functions of both immune and nervous systems. Excessive PAF plays an important role in neural injury via its specific receptor (PAFR). In this study, we hypothesized that PAF signaling activates reactive gliosis after spinal cord injury (SCI), and blocking the PAF pathway would modify the glia scar formation and promote functional recovery. PAF microinjected into the normal wild-type spinal cord induced a dose-dependent activation of microglia and astrocytes. In the SCI mice, PAFR null mutant mice showed a better functional recovery in grip and rotarod performances than wild-type mice. Although both microglia and astrocytes were activated after SCI in wild-type and PAFR null mutant mice, expressions of IL-6, vimentin, nestin, and GFAP were not significantly elevated in PAFR null mutants. Disruption of PAF signaling inhibited the expressions of proteoglycan CS56 and neurocan (CSPG3). Intriguingly, compared to the wild-type SCI mice, less axonal retraction/dieback at 7 dpi but more NFH-labeled axons at 28 dpi was found in the area adjacent to the epicenter in PAFR null mutant SCI mice. Moreover, treatment with PAFR antagonist Ginkgolide B (GB) at the chronic phase rather than acute phase enhanced the functional recovery in the wild-type SCI mice. These findings suggest that PAF signaling participates in reactive gliosis after SCI, and blocking of this signaling enhances functional recovery and to some extent may promote axon regrowth.
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Affiliation(s)
- Yuanyi Wang
- Department of Spine Surgery, First Hospital of Jilin University, 71 Xinmin Street, Changchun, Jilin, 130021, People's Republic of China.,Department of Pediatrics, University of Louisville School of Medicine, 570 S. Preston Street, Donald Baxter Building, Suite 321B, Louisville, KY, 40202, USA
| | - Zhongwen Gao
- Department of Pediatrics, University of Louisville School of Medicine, 570 S. Preston Street, Donald Baxter Building, Suite 321B, Louisville, KY, 40202, USA.,Department of Orthopedics, China-Japan Union Hospital of Jilin University, Changchun, 130033, China
| | - Yiping Zhang
- Norton Healthcare, Norton Neuroscience Institute, Louisville, KY, 40202, USA
| | - Shi-Qing Feng
- Department of Pediatrics, University of Louisville School of Medicine, 570 S. Preston Street, Donald Baxter Building, Suite 321B, Louisville, KY, 40202, USA.,Department of Orthopedics, General Hospital of Tianjin Medical University, Tianjin, 300052, China
| | - Yulong Liu
- Department of Pediatrics, University of Louisville School of Medicine, 570 S. Preston Street, Donald Baxter Building, Suite 321B, Louisville, KY, 40202, USA.,Department of Orthopedics, China-Japan Union Hospital of Jilin University, Changchun, 130033, China
| | - Lisa B E Shields
- Norton Healthcare, Norton Neuroscience Institute, Louisville, KY, 40202, USA
| | - Ying-Zheng Zhao
- Department of Pediatrics, University of Louisville School of Medicine, 570 S. Preston Street, Donald Baxter Building, Suite 321B, Louisville, KY, 40202, USA.,Pharmacy School, Wenzhou Medical University, Wenzhou, 325035, China
| | - Qingsan Zhu
- Department of Orthopedics, China-Japan Union Hospital of Jilin University, Changchun, 130033, China.
| | - David Gozal
- Comer Children's Hospital, Department of Pediatrics, University of Chicago, Chicago, IL, 60637, USA
| | - Christopher B Shields
- Norton Healthcare, Norton Neuroscience Institute, Louisville, KY, 40202, USA.,Department of Anatomical Sciences and Neurobiology, University of Louisville School of Medicine, Louisville, KY, 40202, USA
| | - Jun Cai
- Department of Pediatrics, University of Louisville School of Medicine, 570 S. Preston Street, Donald Baxter Building, Suite 321B, Louisville, KY, 40202, USA. .,Department of Anatomical Sciences and Neurobiology, University of Louisville School of Medicine, Louisville, KY, 40202, USA.
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7
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8
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Grégoire CA, Goldenstein BL, Floriddia EM, Barnabé-Heider F, Fernandes KJL. Endogenous neural stem cell responses to stroke and spinal cord injury. Glia 2015; 63:1469-82. [DOI: 10.1002/glia.22851] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 04/13/2015] [Indexed: 01/13/2023]
Affiliation(s)
- Catherine-Alexandra Grégoire
- Research Center of the University of Montreal Hospital (CRCHUM); Quebec Canada
- CNS Research Group (GRSNC), University of Montreal; Quebec Canada
- Department of Pathology and Cell Biology, Faculty of Medicine; Université De Montréal; Quebec Canada
| | - Brianna L. Goldenstein
- Research Center of the University of Montreal Hospital (CRCHUM); Quebec Canada
- CNS Research Group (GRSNC), University of Montreal; Quebec Canada
- Department of Neurosciences, Faculty of Medicine; Université De Montréal; Quebec Canada
| | | | | | - Karl J. L. Fernandes
- Research Center of the University of Montreal Hospital (CRCHUM); Quebec Canada
- CNS Research Group (GRSNC), University of Montreal; Quebec Canada
- Department of Neurosciences, Faculty of Medicine; Université De Montréal; Quebec Canada
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9
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Immunological demyelination triggers macrophage/microglial cells activation without inducing astrogliosis. Clin Dev Immunol 2013; 2013:812456. [PMID: 24319469 PMCID: PMC3844255 DOI: 10.1155/2013/812456] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Revised: 09/16/2013] [Accepted: 09/24/2013] [Indexed: 12/18/2022]
Abstract
The glial scar formed by reactive astrocytes and axon growth inhibitors associated with myelin play important roles in the failure of axonal regeneration following central nervous system (CNS) injury. Our laboratory has previously demonstrated that immunological demyelination of the CNS facilitates regeneration of severed axons following spinal cord injury. In the present study, we evaluate whether immunological demyelination is accompanied with astrogliosis. We compared the astrogliosis and macrophage/microglial cell responses 7 days after either immunological demyelination or a stab injury to the dorsal funiculus. Both lesions induced a strong activated macrophage/microglial cells response which was significantly higher within regions of immunological demyelination. However, immunological demyelination regions were not accompanied by astrogliosis compared to stab injury that induced astrogliosis which extended several millimeters above and below the lesions, evidenced by astroglial hypertrophy, formation of a glial scar, and upregulation of intermediate filaments glial fibrillary acidic protein (GFAP). Moreover, a stab or a hemisection lesion directly within immunological demyelination regions did not induced astrogliosis within the immunological demyelination region. These results suggest that immunological demyelination creates a unique environment in which astrocytes do not form a glial scar and provides a unique model to understand the putative interaction between astrocytes and activated macrophage/microglial cells.
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Kyritsis N, Kizil C, Brand M. Neuroinflammation and central nervous system regeneration in vertebrates. Trends Cell Biol 2013; 24:128-35. [PMID: 24029244 DOI: 10.1016/j.tcb.2013.08.004] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 08/09/2013] [Accepted: 08/12/2013] [Indexed: 01/11/2023]
Abstract
Injuries in the central nervous system (CNS) are one of the leading causes of mortality or persistent disabilities in humans. One of the reasons why humans cannot recover from neuronal loss is the limited regenerative capacity of their CNS. By contrast, non-mammalian vertebrates exhibit widespread regeneration in diverse tissues including the CNS. Understanding those mechanisms activated during regeneration may improve the regenerative outcome in the severed mammalian CNS. Of those mechanisms, recent evidence suggests that inflammation may be important in regeneration. In this review we compare the different events following acute CNS injury in mammals and non-mammalian vertebrates. We also discuss the involvement of the immune response in initiating regenerative programs and how immune cells and neural stem/progenitor cells (NSPCs) communicate.
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Affiliation(s)
- Nikos Kyritsis
- DFG Center for Regenerative Therapies Dresden - Cluster of Excellence (CRTD), Technische Universität Dresden, Fetscherstraße 105, 01307, Dresden, Germany
| | - Caghan Kizil
- DFG Center for Regenerative Therapies Dresden - Cluster of Excellence (CRTD), Technische Universität Dresden, Fetscherstraße 105, 01307, Dresden, Germany
| | - Michael Brand
- DFG Center for Regenerative Therapies Dresden - Cluster of Excellence (CRTD), Technische Universität Dresden, Fetscherstraße 105, 01307, Dresden, Germany.
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Building biocompatible hydrogels for tissue engineering of the brain and spinal cord. J Funct Biomater 2012; 3:839-63. [PMID: 24955749 PMCID: PMC4030922 DOI: 10.3390/jfb3040839] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Accepted: 10/24/2012] [Indexed: 01/07/2023] Open
Abstract
Tissue engineering strategies employing biomaterials have made great progress in the last few decades. However, the tissues of the brain and spinal cord pose unique challenges due to a separate immune system and their nature as soft tissue. Because of this, neural tissue engineering for the brain and spinal cord may require re-establishing biocompatibility and functionality of biomaterials that have previously been successful for tissue engineering in the body. The goal of this review is to briefly describe the distinctive properties of the central nervous system, specifically the neuroimmune response, and to describe the factors which contribute to building polymer hydrogels compatible with this tissue. These factors include polymer chemistry, polymerization and degradation, and the physical and mechanical properties of the hydrogel. By understanding the necessities in making hydrogels biocompatible with tissue of the brain and spinal cord, tissue engineers can then functionalize these materials for repairing and replacing tissue in the central nervous system.
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Abstract
Inflammation is an essential component for glial scar formation. However, the upstream mediator(s) that triggers the process has not been identified. Previously, we showed that the expression of CD36, an inflammatory mediator, occurs in a subset of astcotyes in the peri-infarct area where the glial scar forms. This study investigates a role for CD36 in astrocyte activation and glial scar formation in stroke. We observed that the expression of CD36 and glial fibrillary acidic protein (GFAP) coincided in control and injured astrocytes and in the brain. Furthermore, GFAP expression was attenuated in CD36 small interfering RNA transfected astrocytes or in the brain of CD36 knockout (KO) mice, suggesting its involvement in GFAP expression. Using an in-vitro model of wound healing, we found that CD36 deficiency attenuated the proliferation of astrocytes and delayed closure of the wound gap. Furthermore, stroke-induced GFAP expression and scar formation were significantly attenuated in the CD36 KO mice compared with wild type. These findings identify CD36 as a novel mediator for injury-induced astrogliosis and scar formation. Targeting CD36 may serve as a potential strategy to reduce glial scar formation in stroke.
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13
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Fernández-Martos CM, González-Fernández C, González P, Maqueda A, Arenas E, Rodríguez FJ. Differential expression of Wnts after spinal cord contusion injury in adult rats. PLoS One 2011; 6:e27000. [PMID: 22073235 PMCID: PMC3206916 DOI: 10.1371/journal.pone.0027000] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Accepted: 10/07/2011] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Spinal cord injury is a major cause of disability that has no clinically accepted treatment. Functional decline following spinal cord injury is caused by mechanical damage, secondary cell death, reactive gliosis and a poor regenerative capacity of damaged axons. Wnt proteins are a family of secreted glycoproteins that play key roles in different developmental processes although little is known of the expression patterns and functions of Wnts in the adult central nervous system in normal or diseased states. FINDINGS Using qRT-PCR analysis, we demonstrate that mRNA encoding most Wnt ligands and soluble inhibitors are constitutively expressed in the healthy adult spinal cord. Strikingly, contusion spinal cord injury induced a time-dependent increase in Wnt mRNA expression from 6 hours until 28 days post-injury, and a narrow peak in the expression of soluble Wnt inhibitors between 1 and 3 days post-injury. These results are consistent with the increase in the migration shift, from day 1 to 7, of the intracellular Wnt signalling component, Dishevelled-3. Moreover, after an initial decrease by 1 day, we also found an increase in phosphorylation of the Wnt co-receptor, low-density lipoprotein receptor-related protein 6, and an increase in active β-catenin protein, both of which suffer a dramatic change, from a homogeneous expression pattern in the grey matter to a disorganized injury-induced pattern. CONCLUSIONS Our results suggest a role for Wnts in spinal cord homeostasis and injury. We demonstrate that after injury Wnt signalling is activated via the Wnt/β-catenin and possibly other pathways. These findings provide an important foundation to further address the function of individual Wnt proteins in vivo and the pathophysiology of spinal cord injury.
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Affiliation(s)
| | | | - Pau González
- Laboratorio de Neurología Molecular, Hospital Nacional de Parapléjicos (HNP), Toledo, Spain
| | - Alfredo Maqueda
- Laboratorio de Neurología Molecular, Hospital Nacional de Parapléjicos (HNP), Toledo, Spain
| | - Ernest Arenas
- Molecular Neurobiology Unit, MBB, Karolinska Institute, Stockholm, Sweden
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14
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Davalos D, Akassoglou K. Fibrinogen as a key regulator of inflammation in disease. Semin Immunopathol 2011; 34:43-62. [PMID: 22037947 DOI: 10.1007/s00281-011-0290-8] [Citation(s) in RCA: 621] [Impact Index Per Article: 47.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Accepted: 10/03/2011] [Indexed: 12/11/2022]
Abstract
The interaction of coagulation factors with the perivascular environment affects the development of disease in ways that extend beyond their traditional roles in the acute hemostatic cascade. Key molecular players of the coagulation cascade like tissue factor, thrombin, and fibrinogen are epidemiologically and mechanistically linked with diseases with an inflammatory component. Moreover, the identification of novel molecular mechanisms linking coagulation and inflammation has highlighted factors of the coagulation cascade as new targets for therapeutic intervention in a wide range of inflammatory human diseases. In particular, a proinflammatory role for fibrinogen has been reported in vascular wall disease, stroke, spinal cord injury, brain trauma, multiple sclerosis, Alzheimer's disease, rheumatoid arthritis, bacterial infection, colitis, lung and kidney fibrosis, Duchenne muscular dystrophy, and several types of cancer. Genetic and pharmacologic studies have unraveled pivotal roles for fibrinogen in determining the extent of local or systemic inflammation. As cellular and molecular mechanisms for fibrinogen functions in tissues are identified, the role of fibrinogen is evolving from a marker of vascular rapture to a multi-faceted signaling molecule with a wide spectrum of functions that can tip the balance between hemostasis and thrombosis, coagulation and fibrosis, protection from infection and extensive inflammation, and eventually life and death. This review will discuss some of the main molecular links between coagulation and inflammation and will focus on the role of fibrinogen in inflammatory disease highlighting its unique structural properties, cellular targets, and signal transduction pathways that make it a potent proinflammatory mediator and a potential therapeutic target.
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Affiliation(s)
- Dimitrios Davalos
- Gladstone Institute of Neurological Disease, University of California, San Francisco, San Francisco, CA 94158, USA
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15
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Ghosh S, Das N, Mandal AK, Dungdung SR, Sarkar S. Mannosylated liposomal cytidine 5' diphosphocholine prevent age related global moderate cerebral ischemia reperfusion induced mitochondrial cytochrome c release in aged rat brain. Neuroscience 2010; 171:1287-99. [PMID: 20883746 DOI: 10.1016/j.neuroscience.2010.09.049] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 09/18/2010] [Accepted: 09/23/2010] [Indexed: 10/19/2022]
Abstract
Mitochondrial dysfunctions generating from cerebral ischemia-reperfusion exert a potential threat on neuronal cell survival and hence, accelerate the aging process and age dependent neuropathology. Thirty min moderate cerebral ischemia induced by bilateral common carotid artery occlusion (BCCAO) followed by 30 min reperfusion caused an increased diene production, depleted glutathione (GSH) content, reduced superoxide dismutase (SOD) and catalase activities and pyramidal neuronal loss in young (2 months old) and aged (20 months old) rat brain compared to sham operated controls. Cytidine 5' diphosphocholine (CDP-Choline) is a known neuroprotective drug. CDP-Choline after metabolism in the liver suffers hydrolysis and splits into cytidine and choline before entering systemic circulation and hardly circumvents blood brain barrier (BBB) as such. Previous reports show CDP-Choline liposomes significantly increased in vivo uptake compared to "free drug" administration in cerebral ischemia. To enhance the therapeutic concentration build up in brain we sought to formulate mannosylated liposomal CDP-Choline (MLCDP) utilizing the mannose receptors. We tested the therapeutic supremacy of MLCDP over liposomal CDP-Choline (LCDP) in global moderate cerebral ischemia reperfusion induced neuronal damage. CDP-Choline in MLCDP delivery system was found potent to exert substantial protection against global moderate cerebral ischemia reperfusion induced mitochondrial damage in aged rat brain. Membrane lipid peroxidation, GSSG/GSH ratio and reactive oxygen species (ROS) generation in cerebral tissue were found to be higher in aged, compared to young rat. Further decline of those parameters was observed in aged rat brain by the induction of global moderate cerebral ischemia and reperfusion. MLCDP treatment when compared to free or LCDP treatment prevented global moderate cerebral ischemia-reperfusion induced mitochondrial damage as evident ultra structurally and release of cytochrome c (cyt c) from mitochondria into cytosol and protected mitochondria to restore its normal structure and functions.
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Affiliation(s)
- S Ghosh
- Biomembrane Division, Indian Institute of Chemical Biology, 4, Raja SC Mullick Road, Kolkata-700032, India
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16
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Fibrinogen triggers astrocyte scar formation by promoting the availability of active TGF-beta after vascular damage. J Neurosci 2010; 30:5843-54. [PMID: 20427645 DOI: 10.1523/jneurosci.0137-10.2010] [Citation(s) in RCA: 280] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Scar formation in the nervous system begins within hours after traumatic injury and is characterized primarily by reactive astrocytes depositing proteoglycans that inhibit regeneration. A fundamental question in CNS repair has been the identity of the initial molecular mediator that triggers glial scar formation. Here we show that the blood protein fibrinogen, which leaks into the CNS immediately after blood-brain barrier (BBB) disruption or vascular damage, serves as an early signal for the induction of glial scar formation via the TGF-beta/Smad signaling pathway. Our studies revealed that fibrinogen is a carrier of latent TGF-beta and induces phosphorylation of Smad2 in astrocytes that leads to inhibition of neurite outgrowth. Consistent with these findings, genetic or pharmacologic depletion of fibrinogen in mice reduces active TGF-beta, Smad2 phosphorylation, glial cell activation, and neurocan deposition after cortical injury. Furthermore, stereotactic injection of fibrinogen into the mouse cortex is sufficient to induce astrogliosis. Inhibition of the TGF-beta receptor pathway abolishes the fibrinogen-induced effects on glial scar formation in vivo and in vitro. These results identify fibrinogen as a primary astrocyte activation signal, provide evidence that deposition of inhibitory proteoglycans is induced by a blood protein that leaks in the CNS after vasculature rupture, and point to TGF-beta as a molecular link between vascular permeability and scar formation.
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17
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Chavarria L, Oria M, Romero-Gimenez J, Alonso J, Lope-Piedrafita S, Cordoba J. Diffusion tensor imaging supports the cytotoxic origin of brain edema in a rat model of acute liver failure. Gastroenterology 2010; 138:1566-73. [PMID: 19843475 DOI: 10.1053/j.gastro.2009.10.003] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2009] [Revised: 09/15/2009] [Accepted: 10/07/2009] [Indexed: 12/02/2022]
Abstract
BACKGROUND & AIMS Brain edema is a severe complication of acute liver failure (ALF) that has been related to ammonia concentrations. Two mechanisms have been proposed in the pathogenesis: vasogenic edema that is secondary to the breakdown of the blood-brain barrier and cytotoxic edema caused by ammonia metabolites in astrocytes. METHODS We applied magnetic resonance techniques to assess the intracellular or extracellular distribution of brain water and metabolites in a rat model of devascularized ALF. The brain water content was assessed by gravimetry and blood-brain barrier permeability was determined from the transfer constant of (14)C-labeled sucrose. RESULTS Rats with ALF had a progressive decrease in the apparent diffusion coefficient (ADC) in all brain regions. The average decrease in ADC was significant in precoma (-14%) and coma stages (-20%). These changes, which indicate an increase of the intracellular water compartment, were followed by a significant increase in total brain water (coma 82.4% +/- 0.3% vs sham 81.6% +/- 0.3%; P = .0001). Brain concentrations of glutamine (6 hours, 540%; precoma, 851%; coma, 1086%) and lactate (6 hours, 166%; precoma, 998%; coma, 3293%) showed a marked increase in ALF that paralleled the decrease in ADC and neurologic outcome. In contrast, the transfer constant of (14)C-sucrose was unaltered. CONCLUSIONS The pathogenesis of brain edema in an experimental model of ALF involves a cytotoxic mechanism: the metabolism of ammonia in astrocytes induces an increase of glutamine and lactate that appears to mediate cellular swelling. Therapeutic measures should focus on removing ammonia and improving brain energy metabolism.
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18
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Frampton JP, Hynd MR, Shuler ML, Shain W. Effects of Glial Cells on Electrode Impedance Recorded from Neural Prosthetic Devices In Vitro. Ann Biomed Eng 2010; 38:1031-47. [DOI: 10.1007/s10439-010-9911-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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19
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Hurtado A, Podinin H, Oudega M, Grimpe B. Deoxyribozyme-mediated knockdown of xylosyltransferase-1 mRNA promotes axon growth in the adult rat spinal cord. Brain 2008; 131:2596-605. [PMID: 18765417 DOI: 10.1093/brain/awn206] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
In the injured spinal cord, proteoglycans (PGs) within scar tissue obstruct axon growth through their glycosaminoglycan (GAG)-side chains. The formation of GAG-side chains (glycosylation) is catalysed by xylosyltransferase-1 (XT-1). Here, we knocked down XT-1 mRNA using a tailored deoxyribozyme (DNAXTas) and hypothesized that this would decrease the amount of glycosylated PGs and, consequently, promote axon growth in the adult rat spinal cord. A continuous 2-week delivery of DNAXTas near the rostral border of a peripheral nerve graft bridging the transected dorsal columns in the thoracic spinal cord resulted in an 81% decrease in XT-1 mRNA, an average of 1.4-fold reduction in GAG-side chains of chondroitin sulphate or heparan sulphate-PGs and 2.2-fold reduction in neurocan and brevican core proteins in scar tissue. Additionally, compared to control deoxyribozyme, the DNAXTas treatment resulted in a 9-fold increase in length and a 4-fold increase in density of ascending axons growing through the nerve graft and scar tissue present at the rostral spinal cord. Together our data showed that treatment with a deoxyribozyme against XT-1 mRNA decreased the amount of glycosylated PGs and promoted axon growth through scar tissue in the injured spinal cord. The deoxyribozyme approach may become a contributing factor in spinal cord repair strategies.
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Affiliation(s)
- Andres Hurtado
- International Center for Spinal Cord Injury, Hugo W Moser Research Institute at Kennedy Krieger, Baltimore, MD, USA
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20
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Filbin MT. Recapitulate development to promote axonal regeneration: good or bad approach? Philos Trans R Soc Lond B Biol Sci 2007; 361:1565-74. [PMID: 16939975 PMCID: PMC1664663 DOI: 10.1098/rstb.2006.1885] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
In the past decade there has been an explosion in our understanding, at the molecular level, of why axons in the adult, mammalian central nervous system (CNS) do not spontaneously regenerate while their younger counterparts do. Now a number of inhibitors of axonal regeneration have been described, some of the receptors they interact with to transduce the inhibitory signal are known, as are some of the steps in the signal transduction pathway that is responsible for inhibition. In addition, developmental changes in the environment and in the neurons themselves are also now better understood. This knowledge in turn reveals novel, putative sites for drug development and therapeutic intervention after injury to the brain and spinal cord. The challenge now is to determine which of these putative treatments are the most effective and if they would be better applied in combination rather than alone. In this review I will summarize what we have learnt about these molecules and how they signal. Importantly, I will also describe approaches that have been shown to block inhibitors and encourage regeneration in vivo. I will also speculate on what the differences are between the neonatal and adult CNS that allow the former to regenerate and the latter not to.
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Affiliation(s)
- Marie T Filbin
- Department of Biological Sciences, Hunter College, City University of New York, 695 Park Avenue, New York, NY 10021, USA.
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21
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Busch SA, Silver J. The role of extracellular matrix in CNS regeneration. Curr Opin Neurobiol 2007; 17:120-7. [PMID: 17223033 DOI: 10.1016/j.conb.2006.09.004] [Citation(s) in RCA: 347] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2006] [Accepted: 09/25/2006] [Indexed: 10/23/2022]
Abstract
Chondroitin sulfate proteoglycans are the principal inhibitory component of glial scars, which form after damage to the adult central nervous system and act as a barrier to regenerating axons. Recent findings have furthered our understanding of the mechanisms that result in a failure of regeneration after spinal cord injury and suggest that a multipartite approach will be required to facilitate long-distance regeneration and functional recovery.
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Affiliation(s)
- Sarah A Busch
- Case Western Reserve University School of Medicine, Department of Neurosciences, 2109 Adelbert Road E-658, Cleveland, Ohio 44106, USA
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22
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Affiliation(s)
- Jerry Silver
- Department of Neurosciences, School of Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA.
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23
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Logan A, Berry M. Cellular and molecular determinants of glial scar formation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2003; 513:115-58. [PMID: 12575819 DOI: 10.1007/978-1-4615-0123-7_4] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ann Logan
- Molecular Neuroscience, Department of Medicine, Wolfson Research Laboratories, Queen Elizabeth Hospital, Edgbaston, Birmingham, B15 2TH, UK
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Kipnis J, Nevo U, Panikashvili D, Alexandrovich A, Yoles E, Akselrod S, Shohami E, Schwartz M. Therapeutic vaccination for closed head injury. J Neurotrauma 2003; 20:559-69. [PMID: 12906740 DOI: 10.1089/089771503767168483] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Closed head injury often has a devastating outcome, partly because the insult, like other injuries to the central nervous system (CNS), triggers self-destructive processes. During studies of the response to other CNS insults, it was unexpectedly discovered that the immune system, if well controlled, provides protection against self-destructive activities. Here we show that in mice with closed head injury, the immune system plays a key role in the spontaneous recovery. Strain-related differences were observed in the ability to harness a T cell-dependent protective mechanism against the effects of the injury. We further show that the trauma-induced deficit could be reduced, both functionally and anatomically, by post-traumatic vaccination with Cop-1, a synthetic copolymer used to treat patients with multiple sclerosis and found (using a different treatment protocol) to effectively counteract the loss of neurons caused by axonal injury or glutamate-induced toxicity. We suggest that a compound such as Cop-1 can be safely developed as a therapeutic vaccine to boost the body's immune repair mechanisms, thereby providing multifactorial protection against the consequences of brain trauma.
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Affiliation(s)
- Jonathan Kipnis
- Department of Neurobiology, The Weizmann Institute of Science, Rehovot, Israel
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