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Sha Q, Wang Y, Zhu Z, Wang H, Qiu H, Niu W, Li X, Qian J. A hyaluronic acid/silk fibroin/poly-dopamine-coated biomimetic hydrogel scaffold with incorporated neurotrophin-3 for spinal cord injury repair. Acta Biomater 2023:S1742-7061(23)00309-4. [PMID: 37257575 DOI: 10.1016/j.actbio.2023.05.044] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 05/08/2023] [Accepted: 05/25/2023] [Indexed: 06/02/2023]
Abstract
Bio-factor stimulation is essential for axonal regeneration in the central nervous system. Thus, persistent and efficient factor delivery in the local microenvironment is an ideal strategy for spinal cord injury repair. We developed a biomimetic hydrogel scaffold to load biofactors in situ and release them in a controlled way as a promising therapeutic modality. Hyaluronic acid and silk fibroin were cross-linked as the basement of the scaffolds, and poly-dopamine coating was used to further increase the loading of factors and endow the hydrogel scaffolds with ideal physical and chemical properties and proper biocompatibility. Notably, neurotrophin-3 release from the hydrogel scaffolds was prolonged to 28 days. A spinal cord injury model was constructed for hydrogel scaffold transplantation. After eight weeks, significant NF200-positive nerve fibers were observed extending across the glial scar to the center of the injured area. Due to the release of neurotrophin-3, spinal cord regeneration was enhanced, and the cavity area of the injury graft site and inflammation associated with CD68 positive cells were reduced, which led to a significant improvement in hind limb motor function. The results show that the hyaluronic acid/silk fibroin/poly-dopamine-coated biomimetic hydrogel scaffold achieved locally slow release of neurotrophin-3, thus facilitating the regeneration of injured spinal cord. STATEMENT OF SIGNIFICANCE: Hydrogels have received great attention in spinal cord regeneration. Current research has focused on more efficient and controlled release of bio-factors. Here, we adopted a mussel-inspired strategy to functionalize the hyaluronic acid/silk fibroin hydrogel scaffold to increase the load of neurotrophin-3 and extend the release time. The hydrogel scaffolds have ideal physiochemical properties, proper release rate, and biocompatibility. Owing to the continuous neurotrophin-3 release from implanted scaffolds, cavity formation is reduced, inflammation alleviated, and spinal cord regeneration enhanced, indicating great potential for bio-factor delivery in soft tissue regeneration applications.
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Affiliation(s)
- Qi Sha
- Department of Orthopedics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, 230032, China
| | - Yankai Wang
- Stomatologic Hospital and College, Anhui Medical University, Key Laboratory of Oral Diseases Research of Anhui Province, Hefei, Anhui 230032, China
| | - Zhi Zhu
- Department of Orthopedics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, 230032, China
| | - Hu Wang
- Department of Orthopedics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, 230032, China
| | - Hua Qiu
- Stomatologic Hospital and College, Anhui Medical University, Key Laboratory of Oral Diseases Research of Anhui Province, Hefei, Anhui 230032, China
| | - Weirui Niu
- Stomatologic Hospital and College, Anhui Medical University, Key Laboratory of Oral Diseases Research of Anhui Province, Hefei, Anhui 230032, China
| | - Xiangyang Li
- Stomatologic Hospital and College, Anhui Medical University, Key Laboratory of Oral Diseases Research of Anhui Province, Hefei, Anhui 230032, China.
| | - Jun Qian
- Department of Orthopedics, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, 230032, China.
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Cheng H, Huang Y, Qian J, Meng F, Fan Y. Organic photovoltaic device enhances the neural differentiation of rat bone marrow-derived mesenchymal stem cells. MEDICINE IN NOVEL TECHNOLOGY AND DEVICES 2022. [DOI: 10.1016/j.medntd.2022.100176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Cheng H, Huang Y, Chen W, Che J, Liu T, Na J, Wang R, Fan Y. Cyclic Strain and Electrical Co-stimulation Improve Neural Differentiation of Marrow-Derived Mesenchymal Stem Cells. Front Cell Dev Biol 2021; 9:624755. [PMID: 34055769 PMCID: PMC8150581 DOI: 10.3389/fcell.2021.624755] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 03/23/2021] [Indexed: 12/26/2022] Open
Abstract
The current study investigated the combinatorial effect of cyclic strain and electrical stimulation on neural differentiation potential of rat bone marrow-derived mesenchymal stem cells (BMSCs) under epidermal growth factor (EGF) and fibroblast growth factor 2 (FGF2) inductions in vitro. We developed a prototype device which can provide cyclic strain and electrical signal synchronously. Using this system, we demonstrated that cyclic strain and electrical co-stimulation promote the differentiation of BMCSs into neural cells with more branches and longer neurites than strain or electrical stimulation alone. Strain and electrical co-stimulation can also induce a higher expression of neural markers in terms of transcription and protein level. Neurotrophic factors and the intracellular cyclic AMP (cAMP) are also upregulated with co-stimulation. Importantly, the co-stimulation further enhances the calcium influx of neural differentiated BMSCs when responding to acetylcholine and potassium chloride (KCl). Finally, the phosphorylation of extracellular-signal-regulated kinase (ERK) 1 and 2 and protein kinase B (AKT) was elevated under co-stimulation treatment. The present work suggests a synergistic effect of the combination of cyclic strain and electrical stimulation on BMSC neuronal differentiation and provides an alternative approach to physically manipulate stem cell differentiation into mature and functional neural cells in vitro.
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Affiliation(s)
- Hong Cheng
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Chinese Education Ministry, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yan Huang
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Chinese Education Ministry, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Wei Chen
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Chinese Education Ministry, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Jifei Che
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Chinese Education Ministry, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Taidong Liu
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Chinese Education Ministry, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Jing Na
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Chinese Education Ministry, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Ruojin Wang
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Chinese Education Ministry, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yubo Fan
- Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Chinese Education Ministry, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.,School of Engineering Medicine, Beihang University, Beijing, China
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Li T, Li YT, Song DY. The expression of IL-1β can deteriorate the prognosis of nervous system after spinal cord injury. Int J Neurosci 2018; 128:778-782. [PMID: 29308940 DOI: 10.1080/00207454.2018.1424154] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
PURPOSE We used Anakinra to inhibit the expression of IL-1β based on the model of spinal cord injury in the rat stomach and explored whether it had a certain neuroprotective effect after spinal cord injury. MATERIALS AND METHODS The spinal cord injury model of four segments (T5-T8) was prepared by using vascular clamp. Thirty rats were randomized to the control group and the experimental group, and the control group used normal saline, while the experimental group used Anakinra after spinal cord injury. The spinal cord tissue was extracted at 6 h and 24 h after the operation to carry out the histopathological evaluation and to analyze the contents of IL-1β and malondialdehyde and the activities of glutathione peroxidase and superoxide dismutase. RESULTS Edema and inflammatory cell infiltration were obviously seen after spinal cord injury, the IL-1β level in serum was significantly increased, but the activity of glutathione peroxidase, superoxide dismutase and catalase was decreased in the control group compared with the experimental group. The experimental group could increase the activity of antioxidant enzymes, but had no significant effect on malondialdehyde. CONCLUSIONS Anakinra had a certain protective effect through the inhibition of IL-1β on spinal cord injury.
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Affiliation(s)
- Tao Li
- a Department of Spinal Surgery , Shandong Provincial Hospital Affiliated to Shandong University , Jinan , Shandong , P.R. China
| | - Yu-Tang Li
- b Department of Microbiology and Infectious Disease Center , School of Basic Medical Sciences, Peking University Health Science Center , Beijing , P.R. China
| | - Di-Yu Song
- c Department of Orthopedics , The General Hospital of the PLA Rocket Force , Beijing , P.R. China
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Walsh JT, Hendrix S, Boato F, Smirnov I, Zheng J, Lukens JR, Gadani S, Hechler D, Gölz G, Rosenberger K, Kammertöns T, Vogt J, Vogelaar C, Siffrin V, Radjavi A, Fernandez-Castaneda A, Gaultier A, Gold R, Kanneganti TD, Nitsch R, Zipp F, Kipnis J. MHCII-independent CD4+ T cells protect injured CNS neurons via IL-4. J Clin Invest 2015; 125:699-714. [PMID: 25607842 PMCID: PMC4319416 DOI: 10.1172/jci76210] [Citation(s) in RCA: 116] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 12/02/2014] [Indexed: 12/13/2022] Open
Abstract
A body of experimental evidence suggests that T cells mediate neuroprotection following CNS injury; however, the antigen specificity of these T cells and how they mediate neuroprotection are unknown. Here, we have provided evidence that T cell-mediated neuroprotection after CNS injury can occur independently of major histocompatibility class II (MHCII) signaling to T cell receptors (TCRs). Using two murine models of CNS injury, we determined that damage-associated molecular mediators that originate from injured CNS tissue induce a population of neuroprotective, IL-4-producing T cells in an antigen-independent fashion. Compared with wild-type mice, IL-4-deficient animals had decreased functional recovery following CNS injury; however, transfer of CD4+ T cells from wild-type mice, but not from IL-4-deficient mice, enhanced neuronal survival. Using a culture-based system, we determined that T cell-derived IL-4 protects and induces recovery of injured neurons by activation of neuronal IL-4 receptors, which potentiated neurotrophin signaling via the AKT and MAPK pathways. Together, these findings demonstrate that damage-associated molecules from the injured CNS induce a neuroprotective T cell response that is independent of MHCII/TCR interactions and is MyD88 dependent. Moreover, our results indicate that IL-4 mediates neuroprotection and recovery of the injured CNS and suggest that strategies to enhance IL-4-producing CD4+ T cells have potential to attenuate axonal damage in the course of CNS injury in trauma, inflammation, or neurodegeneration.
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Affiliation(s)
- James T. Walsh
- Center for Brain Immunology and Glia
- Department of Neuroscience
- Graduate Program in Neuroscience, and
- Medical Scientist Training Program, School of Medicine, University of Virginia, Charlottesville, Virginia, USA
| | - Sven Hendrix
- Department of Morphology and BIOMED Institute, Hasselt University, Diepenbeek, Belgium
- Institute for Cell Biology and Neurobiology, Center for Anatomy, Charité — Universitätsmedizin Berlin, Berlin, Germany
| | - Francesco Boato
- Institute for Cell Biology and Neurobiology, Center for Anatomy, Charité — Universitätsmedizin Berlin, Berlin, Germany
- Institute for Microscopic Anatomy and Neurobiology, Focus Program Translational Neuroscience, University Medical Center, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Igor Smirnov
- Center for Brain Immunology and Glia
- Department of Neuroscience
| | - Jingjing Zheng
- Center for Brain Immunology and Glia
- Department of Neuroscience
- Institute of Neurosciences, Fourth Military Medical University, Xi’an, China
| | - John R. Lukens
- Center for Brain Immunology and Glia
- Department of Neuroscience
- Department of Immunology, St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
| | - Sachin Gadani
- Center for Brain Immunology and Glia
- Department of Neuroscience
- Graduate Program in Neuroscience, and
- Medical Scientist Training Program, School of Medicine, University of Virginia, Charlottesville, Virginia, USA
| | - Daniel Hechler
- Institute for Cell Biology and Neurobiology, Center for Anatomy, Charité — Universitätsmedizin Berlin, Berlin, Germany
| | - Greta Gölz
- Institute for Cell Biology and Neurobiology, Center for Anatomy, Charité — Universitätsmedizin Berlin, Berlin, Germany
| | - Karen Rosenberger
- Institute for Cell Biology and Neurobiology, Center for Anatomy, Charité — Universitätsmedizin Berlin, Berlin, Germany
| | | | - Johannes Vogt
- Institute for Cell Biology and Neurobiology, Center for Anatomy, Charité — Universitätsmedizin Berlin, Berlin, Germany
- Institute for Microscopic Anatomy and Neurobiology, Focus Program Translational Neuroscience, University Medical Center, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Christina Vogelaar
- Institute for Microscopic Anatomy and Neurobiology, Focus Program Translational Neuroscience, University Medical Center, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Volker Siffrin
- Department of Neurology, Focus Program Translational Neuroscience and Center for Immunotherapy, University Medical Center, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Ali Radjavi
- Center for Brain Immunology and Glia
- Department of Neuroscience
- Graduate Program in Microbiology, Immunology and Infectious Diseases, School of Medicine, University of Virginia, Charlottesville, Virginia, USA
| | | | - Alban Gaultier
- Center for Brain Immunology and Glia
- Department of Neuroscience
- Graduate Program in Neuroscience, and
| | - Ralf Gold
- Department of Neurology, St. Josef Hospital/Ruhr-University Bochum, Bochum, Germany
| | | | - Robert Nitsch
- Institute for Cell Biology and Neurobiology, Center for Anatomy, Charité — Universitätsmedizin Berlin, Berlin, Germany
- Institute for Microscopic Anatomy and Neurobiology, Focus Program Translational Neuroscience, University Medical Center, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Frauke Zipp
- Department of Neurology, Focus Program Translational Neuroscience and Center for Immunotherapy, University Medical Center, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Jonathan Kipnis
- Center for Brain Immunology and Glia
- Department of Neuroscience
- Graduate Program in Neuroscience, and
- Medical Scientist Training Program, School of Medicine, University of Virginia, Charlottesville, Virginia, USA
- Graduate Program in Microbiology, Immunology and Infectious Diseases, School of Medicine, University of Virginia, Charlottesville, Virginia, USA
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Barbosa DJ, Capela JP, de Lourdes Bastos M, Carvalho F. In vitro models for neurotoxicology research. Toxicol Res (Camb) 2015; 4:801-842. [DOI: 10.1039/c4tx00043a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023] Open
Abstract
The nervous system has a highly complex organization, including many cell types with multiple functions, with an intricate anatomy and unique structural and functional characteristics; the study of its (dys)functionality following exposure to xenobiotics, neurotoxicology, constitutes an important issue in neurosciences.
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Affiliation(s)
- Daniel José Barbosa
- REQUIMTE (Rede de Química e Tecnologia)
- Laboratório de Toxicologia
- Departamento de Ciências Biológicas
- Faculdade de Farmácia
- Universidade do Porto
| | - João Paulo Capela
- REQUIMTE (Rede de Química e Tecnologia)
- Laboratório de Toxicologia
- Departamento de Ciências Biológicas
- Faculdade de Farmácia
- Universidade do Porto
| | - Maria de Lourdes Bastos
- REQUIMTE (Rede de Química e Tecnologia)
- Laboratório de Toxicologia
- Departamento de Ciências Biológicas
- Faculdade de Farmácia
- Universidade do Porto
| | - Félix Carvalho
- REQUIMTE (Rede de Química e Tecnologia)
- Laboratório de Toxicologia
- Departamento de Ciências Biológicas
- Faculdade de Farmácia
- Universidade do Porto
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Tsai YW, Yang YR, Sun SH, Liang KC, Wang RY. Post ischemia intermittent hypoxia induces hippocampal neurogenesis and synaptic alterations and alleviates long-term memory impairment. J Cereb Blood Flow Metab 2013; 33:764-73. [PMID: 23443175 PMCID: PMC3652689 DOI: 10.1038/jcbfm.2013.15] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Adult hippocampal neurogenesis is important for learning and memory, especially after a brain injury such as ischemia. Newborn hippocampal neurons contribute to memory performance by establishing functional synapses with target cells. This study demonstrated that the maturation of hippocampal neurons is enhanced by postischemia intermittent hypoxia (IH) intervention. The effects of IH intervention in cultured neurons were mediated by increased synaptogenesis, which was primarily regulated by brain-derived neurotrophic factor (BDNF)/PI3K/AKT. Hippocampal neo-neurons expressed BDNF and exhibited enhanced presynaptic function as indicated by increases in the pSynapsin expression, synaptophysin intensity, and postsynapse density following IH intervention after ischemia. Postischemia IH-induced hippocampal neo-neurons were affected by presynaptic activity, which reflected the dynamic plasticity of the glutamatergic receptors. These alterations were also associated with the alleviation of ischemia-induced long-term memory impairment. Our results suggest that postischemia IH intervention rescued ischemia-induced spatial learning and memory impairment by inducing hippocampal neurogenesis and functional synaptogenesis via BDNF expression.
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Affiliation(s)
- Yi-Wei Tsai
- Department and Institute of Physical Therapy and Assistive Technology, National Yang-Ming University, Taipei, Taiwan
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Boato F, Rosenberger K, Nelissen S, Geboes L, Peters EM, Nitsch R, Hendrix S. Absence of IL-1β positively affects neurological outcome, lesion development and axonal plasticity after spinal cord injury. J Neuroinflammation 2013; 10:6. [PMID: 23317037 PMCID: PMC3585738 DOI: 10.1186/1742-2094-10-6] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Accepted: 12/07/2012] [Indexed: 11/10/2022] Open
Abstract
Precise crosstalk between the nervous and immune systems is important for neuroprotection and axon plasticity after injury. Recently, we demonstrated that IL-1β acts as a potent inducer of neurite outgrowth from organotypic brain slices in vitro, suggesting a potential function of IL-1β in axonal plasticity. Here, we have investigated the effects of IL-1β on axon plasticity during glial scar formation and on functional recovery in a mouse model of spinal cord compression injury (SCI). We used an IL-1β deficiency model (IL-1βKO mice) and administered recombinant IL-1β. In contrast to our hypothesis, the histological analysis revealed a significantly increased lesion width and a reduced number of corticospinal tract fibers caudal to the lesion center after local application of recombinant IL-1β. Consistently, the treatment significantly worsened the neurological outcome after SCI in mice compared with PBS controls. In contrast, the absence of IL-1β in IL-1βKO mice significantly improved recovery from SCI compared with wildtype mice. Histological analysis revealed a smaller lesion size, reduced lesion width and greatly decreased astrogliosis in the white matter, while the number of corticospinal tract fibers increased significantly 5 mm caudal to the lesion in IL-1βKO mice relative to controls. Our study for the first time characterizes the detrimental effects of IL-1β not only on lesion development (in terms of size and glia activation), but also on the plasticity of central nervous system axons after injury.
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Affiliation(s)
- Francesco Boato
- Department of Morphology & BIOMED Institute, Campus Diepenbeek, Hasselt University, Agoralaan Gebouw C, Diepenbeek, BE 3590, Belgium
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Harrill JA, Robinette BL, Freudenrich T, Mundy WR. Use of high content image analyses to detect chemical-mediated effects on neurite sub-populations in primary rat cortical neurons. Neurotoxicology 2013; 34:61-73. [DOI: 10.1016/j.neuro.2012.10.013] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Revised: 10/10/2012] [Accepted: 10/24/2012] [Indexed: 12/28/2022]
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Namsolleck P, Boato F, Schwengel K, Paulis L, Matho KS, Geurts N, Thöne-Reineke C, Lucht K, Seidel K, Hallberg A, Dahlöf B, Unger T, Hendrix S, Steckelings UM. AT2-receptor stimulation enhances axonal plasticity after spinal cord injury by upregulating BDNF expression. Neurobiol Dis 2012; 51:177-91. [PMID: 23174180 DOI: 10.1016/j.nbd.2012.11.008] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Revised: 10/22/2012] [Accepted: 11/09/2012] [Indexed: 12/12/2022] Open
Abstract
It is widely accepted that the angiotensin AT2-receptor (AT2R) has neuroprotective features. In the present study we tested pharmacological AT2R-stimulation as a therapeutic approach in a model of spinal cord compression injury (SCI) in mice using the novel non-peptide AT2R-agonist, Compound 21 (C21). Complementary experiments in primary neurons and organotypic cultures served to identify underlying mechanisms. Functional recovery and plasticity of corticospinal tract (CST) fibers following SCI were monitored after application of C21 (0.3mg/kg/dayi.p.) or vehicle for 4 weeks. Organotypic co-culture of GFP-positive entorhinal cortices with hippocampal target tissue served to evaluate the impact of C21 on reinnervation. Neuronal differentiation, apoptosis and expression of neurotrophins were investigated in primary murine astrocytes and neuronal cells. C21 significantly improved functional recovery after SCI compared to controls, and this significantly correlated with the increased number of CST fibers caudal to the lesion site. In vitro, C21 significantly promoted reinnervation in organotypic brain slice co-cultures (+50%) and neurite outgrowth of primary neurons (+25%). C21-induced neurite outgrowth was absent in neurons derived from AT2R-KO mice. In primary neurons, treatment with C21 further induced RNA expression of anti-apoptotic Bcl-2 (+75.7%), brain-derived neurotrophic factor (BDNF) (+53.7%), the neurotrophin receptors TrkA (+57.4%) and TrkB (+67.9%) and a marker for neurite growth, GAP43 (+103%), but not TrkC. Our data suggest that selective AT2R-stimulation improves functional recovery in experimental spinal cord injury through promotion of axonal plasticity and through neuroprotective and anti-apoptotic mechanisms. Thus, AT2R-stimulation may be considered for the development of a novel therapeutic approach for the treatment of spinal cord injury.
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Affiliation(s)
- Pawel Namsolleck
- Center for Cardiovascular Research, Institute of Pharmacology, Charité-Universitätsmedizin Berlin, Hessische Str. 3-4, 10115 Berlin, Germany
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Loske P, Boato F, Hendrix S, Piepgras J, Just I, Ahnert-Hilger G, Höltje M. Minimal essential length of Clostridium botulinum C3 peptides to enhance neuronal regenerative growth and connectivity in a non-enzymatic mode. J Neurochem 2012; 120:1084-96. [PMID: 22239108 DOI: 10.1111/j.1471-4159.2012.07657.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
C3 ADP-ribosyltransferase is a valuable tool to study Rho-dependent cellular processes. In the current study we investigated the impact of enzyme-deficient peptides derived from Clostridium botulinum C3 transferase in the context of neuronal process elongation and branching, synaptic connectivity, and putative beneficial effects on functional outcome following traumatic injury to the CNS. By screening a range of peptidic fragments, we identified three short peptides from C3bot that promoted axon and dendrite outgrowth in cultivated hippocampal neurons. Furthermore, one of these fragments, a 26-amino acid peptide covering the residues 156-181 enhanced synaptic connectivity in primary hippocampal culture. This peptide was also effective to foster axon outgrowth and re-innervation in organotypical brain slice culture. To evaluate the potential of the 26mer to foster repair mechanisms after CNS injury we applied this peptide to mice subjected to spinal cord injury by either compression impact or hemisection. A single local administration at the site of the lesion improved locomotor recovery. In addition, histological analysis revealed an increased serotonergic input to lumbar motoneurons in treated compared with control mice. Pull-down assays showed that lesion-induced up-regulation of RhoA activity within the spinal cord was largely blocked by C3bot peptides despite the lack of enzymatic activity.
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Affiliation(s)
- Peter Loske
- Center for Anatomy, Functional Cell Biology, Charité-Universitätsmedizin Berlin, Berlin, Germany
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Boato F, Hechler D, Rosenberger K, Lüdecke D, Peters EM, Nitsch R, Hendrix S. Interleukin-1 beta and neurotrophin-3 synergistically promote neurite growth in vitro. J Neuroinflammation 2011; 8:183. [PMID: 22200088 PMCID: PMC3275552 DOI: 10.1186/1742-2094-8-183] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Accepted: 12/26/2011] [Indexed: 01/19/2023] Open
Abstract
Pro-inflammatory cytokines such as interleukin-1 beta (IL-1β) are considered to exert detrimental effects during brain trauma and in neurodegenerative disorders. Consistently, it has been demonstrated that IL-1β suppresses neurotrophin-mediated neuronal cell survival rendering neurons vulnerable to degeneration. Since neurotrophins are also well known to strongly influence axonal plasticity, we investigated here whether IL-1β has a similar negative impact on neurite growth. We analyzed neurite density and length of organotypic brain and spinal cord slice cultures under the influence of the neurotrophins NGF, BDNF, NT-3 and NT-4. In brain slices, only NT-3 significantly promoted neurite density and length. Surprisingly, a similar increase of neurite growth was induced by IL-1β. Additionally, both factors increased the number of brain slices displaying maximal neurite growth. Furthermore, the co-administration of IL-1β and NT-3 significantly increased the number of brain slices displaying maximal neurite growth compared to single treatments. These data indicate that these two factors synergistically stimulate two distinct aspects of neurite outgrowth, namely neurite density and neurite length from acute organotypic brain slices.
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Affiliation(s)
- Francesco Boato
- Dept. of Functional Morphology & BIOMED Institute, Hasselt University, Belgium
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