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Chen G, Luo X, Wang W, Wang Y, Zhu F, Wang W. Interleukin-1β Promotes Schwann Cells De-Differentiation in Wallerian Degeneration via the c-JUN/AP-1 Pathway. Front Cell Neurosci 2019; 13:304. [PMID: 31338026 PMCID: PMC6629865 DOI: 10.3389/fncel.2019.00304] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Accepted: 06/21/2019] [Indexed: 12/20/2022] Open
Abstract
Schwann cells (SCs) de-differentiate in Wallerian degeneration (WD) following nerve injury and, by doing so, can actively promote nerve repair and functional recovery. An innate-immune response is an important component of the complex of events referred to as WD. Damaged peripheral nervous system SCs produce IL-1β and other inflammatory cytokines. We hypothesized that, in addition to a role in immune responses, IL-1β participates in de-differentiation and proliferation of SCs. qPCR and ELISA demonstrated that expression of IL-1β mRNAs and protein increased after nerve injury. Immunofluorescent staining and western blotting demonstrated that expression of the p75 neurotrophin receptor (p75NTR) was significantly increased and levels of myelin protein zero (MPZ) were significantly decreased after IL-1β exposure compared with control groups in vitro WD. Additionally, qPCR demonstrated that IL-1β elevated expression of the de-differentiation gene p75NTR and decreased expression of myelination locus MPZ and promoted SCs de-differentiation. Furthermore, immunofluorescent staining, western blotting, qPCR and ELISA revealed that IL-1β promoted c-JUN expression and activation of AP-1 activity of SCs in an in vitro WD model. Finally, Immunofluorescent staining illustrated that IL-1β elevated expression of Ki67 in SCs nuclei, the apoptosis of SCs were detected by TUNEL. SCs of WD produce IL-1β which promotes SCs de-differentiation and proliferation.
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Affiliation(s)
- Gang Chen
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaohe Luo
- Department of Plastic Surgery, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Wenjin Wang
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yimei Wang
- Department of Plastic Surgery, First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Fei Zhu
- Department of Plastic Surgery, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Wei Wang
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Chung HJ, Kim M, Jung J, Jeong NY. Inhibition of Neuronal Nitric Oxide Synthase by Ethyl Pyruvate in Schwann Cells Protects Against Peripheral Nerve Degeneration. Neurochem Res 2019; 44:1964-1976. [DOI: 10.1007/s11064-019-02830-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Revised: 05/07/2019] [Accepted: 06/14/2019] [Indexed: 12/29/2022]
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103
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The natural plant flavonoid apigenin is a strong antioxidant that effectively delays peripheral neurodegenerative processes. Anat Sci Int 2019; 94:285-294. [DOI: 10.1007/s12565-019-00486-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 03/21/2019] [Indexed: 12/22/2022]
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104
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Jessen KR, Arthur-Farraj P. Repair Schwann cell update: Adaptive reprogramming, EMT, and stemness in regenerating nerves. Glia 2019; 67:421-437. [PMID: 30632639 DOI: 10.1002/glia.23532] [Citation(s) in RCA: 207] [Impact Index Per Article: 41.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 08/20/2018] [Accepted: 09/05/2018] [Indexed: 12/16/2022]
Abstract
Schwann cells respond to nerve injury by cellular reprogramming that generates cells specialized for promoting regeneration and repair. These repair cells clear redundant myelin, attract macrophages, support survival of damaged neurons, encourage axonal growth, and guide axons back to their targets. There are interesting parallels between this response and that found in other tissues. At the cellular level, many other tissues also react to injury by cellular reprogramming, generating cells specialized to promote tissue homeostasis and repair. And at the molecular level, a common feature possessed by Schwann cells and many other cells is the injury-induced activation of genes associated with epithelial-mesenchymal transitions and stemness, differentiation states that are linked to cellular plasticity and that help injury-induced tissue remodeling. The number of signaling systems regulating Schwann cell plasticity is rapidly increasing. Importantly, this includes mechanisms that are crucial for the generation of functional repair Schwann cells and nerve regeneration, although they have no or a minor role elsewhere in the Schwann cell lineage. This encourages the view that selective tools can be developed to control these particular cells, amplify their repair supportive functions and prevent their deterioration. In this review, we discuss the emerging similarities between the injury response seen in nerves and in other tissues and survey the transcription factors, epigenetic mechanisms, and signaling cascades that control repair Schwann cells, with emphasis on systems that selectively regulate the Schwann cell injury response.
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Affiliation(s)
- Kristjan R Jessen
- Department of Cell and Developmental Biology, University College London, London, United Kingdom
| | - Peter Arthur-Farraj
- John Van Geest Centre for Brain Repair, Department of Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom
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105
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Jessen KR, Mirsky R. The Success and Failure of the Schwann Cell Response to Nerve Injury. Front Cell Neurosci 2019; 13:33. [PMID: 30804758 PMCID: PMC6378273 DOI: 10.3389/fncel.2019.00033] [Citation(s) in RCA: 272] [Impact Index Per Article: 54.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 01/22/2019] [Indexed: 01/06/2023] Open
Abstract
The remarkable plasticity of Schwann cells allows them to adopt the Remak (non-myelin) and myelin phenotypes, which are specialized to meet the needs of small and large diameter axons, and differ markedly from each other. It also enables Schwann cells initially to mount a strikingly adaptive response to nerve injury and to promote regeneration by converting to a repair-promoting phenotype. These repair cells activate a sequence of supportive functions that engineer myelin clearance, prevent neuronal death, and help axon growth and guidance. Eventually, this response runs out of steam, however, because in the long run the phenotype of repair cells is unstable and their survival is compromised. The re-programming of Remak and myelin cells to repair cells, together with the injury-induced switch of peripheral neurons to a growth mode, gives peripheral nerves their strong regenerative potential. But it remains a challenge to harness this potential and devise effective treatments that maintain the initial repair capacity of peripheral nerves for the extended periods typically required for nerve repair in humans.
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Affiliation(s)
- Kristjan R Jessen
- Department of Cell and Developmental Biology, University College London, London, United Kingdom
| | - Rhona Mirsky
- Department of Cell and Developmental Biology, University College London, London, United Kingdom
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106
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Dun XP, Carr L, Woodley PK, Barry RW, Drake LK, Mindos T, Roberts SL, Lloyd AC, Parkinson DB. Macrophage-Derived Slit3 Controls Cell Migration and Axon Pathfinding in the Peripheral Nerve Bridge. Cell Rep 2019; 26:1458-1472.e4. [PMID: 30726731 PMCID: PMC6367597 DOI: 10.1016/j.celrep.2018.12.081] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 06/26/2018] [Accepted: 12/18/2018] [Indexed: 11/15/2022] Open
Abstract
Slit-Robo signaling has been characterized as a repulsive signal for precise axon pathfinding and cell migration during embryonic development. Here, we describe a role for Sox2 in the regulation of Robo1 in Schwann cells and for Slit3-Robo1 signaling in controlling axon guidance within the newly formed nerve bridge following peripheral nerve transection injury. In particular, we show that macrophages form the outermost layer of the nerve bridge and secrete high levels of Slit3, while migratory Schwann cells and fibroblasts inside the nerve bridge express the Robo1 receptor. In line with this pattern of Slit3 and Robo1 expression, we observed multiple axon regeneration and cell migration defects in the nerve bridge of Sox2-, Slit3-, and Robo1-mutant mice. Our findings have revealed important functions for macrophages in the peripheral nervous system, utilizing Slit3-Robo1 signaling to control correct peripheral nerve bridge formation and precise axon targeting to the distal nerve stump following injury.
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Affiliation(s)
- Xin-Peng Dun
- Faculty of Medicine and Dentistry, Plymouth University, Plymouth, Devon, UK; School of Pharmacy, Hubei University of Science and Technology, Xian-Ning City, Hubei, China; The Co-innovation Center of Neuroregeneration, Nantong University, Jiangsu Province, China.
| | - Lauren Carr
- Faculty of Medicine and Dentistry, Plymouth University, Plymouth, Devon, UK
| | - Patricia K Woodley
- Faculty of Medicine and Dentistry, Plymouth University, Plymouth, Devon, UK
| | | | | | - Thomas Mindos
- Faculty of Medicine and Dentistry, Plymouth University, Plymouth, Devon, UK
| | - Sheridan L Roberts
- Faculty of Medicine and Dentistry, Plymouth University, Plymouth, Devon, UK
| | - Alison C Lloyd
- MRC Laboratory for Molecular Cell Biology, University College London, London, UK
| | - David B Parkinson
- Faculty of Medicine and Dentistry, Plymouth University, Plymouth, Devon, UK
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Amos-Kroohs RM, Usach V, Piñero G, Vorhees CV, Vivot RM, Soto PA, Williams MT, Setton-Avruj P. Metal bashing: iron deficiency and manganese overexposure impact on peripheral nerves. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2019; 82:99-112. [PMID: 30652531 PMCID: PMC6397089 DOI: 10.1080/15287394.2019.1566105] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Iron (Fe) deficiency (FeD) and manganese (Mn) overexposure (MnOE) may result in several neurological alterations in the nervous system. Iron deficiency produces unique neurological deficits due to its elemental role in central nervous system (CNS) development and myelination, which might persist after normalization of Fe in the diet. Conversely, MnOE is associated with diverse neurocognitive deficits. Despite these well-known neurotoxic effects on the CNS, the influence of FeD and MnOE on the peripheral nervous system (PNS) remains poorly understood. The aim of the present investigation was to examine the effects of developmental FeD and MnOE or their combination on the sciatic nerve of young and adult rats. The parameters measured included divalent metal transporter 1 (DMT1), transferrin receptor (TfR), myelin basic protein (MBP) and peripheral myelin protein 22 (PMP22) expression, as well as Fe levels in the nerve. Our results showed that FeD produced a significant reduction in MBP and PMP22 content at P29, which persisted at P60 after Fe-sufficient diet replenishment regardless of Mn exposure levels. At P60 MnOE significantly increased sciatic nerve Fe content and DMT1 expression. However, the combination of FeD and MnOE produced no marked motor skill impairment. Evidence indicates that FeD appears to hinder developmental peripheral myelination, while MnOE may directly alter Fe homeostasis. Further studies are required to elucidate the interplay between these pathological conditions.
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Affiliation(s)
- Robyn M. Amos-Kroohs
- University of North Carolina at Chapel Hill, Nutrition Research Institute, Kannapolis, NC 28081
| | - Vanina Usach
- Departamento de Química Biológica, Facultad de Farmacia y Bíoquímica, Universidad de Buenos Aires. Instituto de Química y Físicoquímica Biológica (IQUIFIB), UBA-CONICET, Buenos Aires. Argentina
| | - Gonzalo Piñero
- Departamento de Química Biológica, Facultad de Farmacia y Bíoquímica, Universidad de Buenos Aires. Instituto de Química y Físicoquímica Biológica (IQUIFIB), UBA-CONICET, Buenos Aires. Argentina
| | - Charles V. Vorhees
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati OH 45229
- Cincinnati Children’s Research Foundation, Div. of Neurology, Cincinnati OH 45229
| | - Rocío Martinez Vivot
- Departamento de Química Biológica, Facultad de Farmacia y Bíoquímica, Universidad de Buenos Aires. Instituto de Química y Físicoquímica Biológica (IQUIFIB), UBA-CONICET, Buenos Aires. Argentina
| | - Paula A. Soto
- Departamento de Química Biológica, Facultad de Farmacia y Bíoquímica, Universidad de Buenos Aires. Instituto de Química y Físicoquímica Biológica (IQUIFIB), UBA-CONICET, Buenos Aires. Argentina
| | - Michael T. Williams
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati OH 45229
- Cincinnati Children’s Research Foundation, Div. of Neurology, Cincinnati OH 45229
| | - Patricia Setton-Avruj
- Departamento de Química Biológica, Facultad de Farmacia y Bíoquímica, Universidad de Buenos Aires. Instituto de Química y Físicoquímica Biológica (IQUIFIB), UBA-CONICET, Buenos Aires. Argentina
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108
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Morikawa S, Iribar H, Gutiérrez-Rivera A, Ezaki T, Izeta A. Pericytes in Cutaneous Wound Healing. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1147:1-63. [DOI: 10.1007/978-3-030-16908-4_1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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109
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Liu Z, Chen S, Qiu C, Sun Y, Li W, Jiang J, Zhang JM. Fractalkine/CX3CR1 Contributes to Endometriosis-Induced Neuropathic Pain and Mechanical Hypersensitivity in Rats. Front Cell Neurosci 2018; 12:495. [PMID: 30622457 PMCID: PMC6309014 DOI: 10.3389/fncel.2018.00495] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Accepted: 12/03/2018] [Indexed: 11/13/2022] Open
Abstract
Pain is the most severe and common symptom of endometriosis. Its underlying pathogenetic mechanism is poorly understood. Nerve sensitization is a particular research challenge, due to the limitations of general endometriosis models and sampling nerve tissue from patients. The chemokine fractalkine (FKN) has been demonstrated to play a key role in various forms of neuropathic pain, while its role in endometriotic pain is unknown. Our study was designed to explore the function of FKN in the development and maintenance of peripheral hyperalgesia and central sensitization in endometriosis using a novel endometriosis animal model developed in our laboratory. After modeling, behavioral tests were carried out and the optimal time for molecular changes was obtained. We extracted ectopic tissues and L4-6 spinal cords to detect peripheral and central roles for FKN, respectively. To assess morphologic characteristics of endometriosis-like lesions-as well as expression and location of FKN/CX3CR1-we performed H&E staining, immunostaining, and western blotting analyses. Furthermore, inhibition of FKN expression in the spinal cord was achieved by intrathecal administration of an FKN-neutralizing antibody to demonstrate its function. Our results showed that implanted autologous uterine tissue around the sciatic nerve induced endometriosis-like lesions and produced mechanical hyperalgesia and allodynia. FKN was highly expressed on macrophages, whereas its receptor CX3CR1 was overexpressed in the myelin sheath of sciatic nerve fibers. Overexpressed FKN was also observed in neurons. CX3CR1/pp38-MAPK was upregulated in activated microglia in the spinal dorsal horn. Intrathecal administration of FKN-neutralizing antibody not only reversed the established mechanical hyperalgesia and allodynia, but also inhibited the expression of CX3CR1/pp38-MAPK in activated microglia, which was essential for the persistence of central sensitization. We concluded that the FKN/CX3CR1 signaling pathway might be one of the mechanisms of peripheral hyperalgesia in endometriosis, which requires further studies. Spinal FKN is important for the development and maintenance of central sensitization in endometriosis, and it may further serve as a novel therapeutic target to relieve persistent pain associated with endometriosis.
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Affiliation(s)
- Zhiming Liu
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China.,Key Laboratory of Gynecologic Oncology of Shandong Province, Qilu Hospital of Shandong University, Jinan, China
| | - Sisi Chen
- Pain Research Center, Department of Anesthesiology, University of Cincinnati College of Medicine, Cincinnati, OH, United States
| | - Chunping Qiu
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China.,Key Laboratory of Gynecologic Oncology of Shandong Province, Qilu Hospital of Shandong University, Jinan, China
| | - Yaqiong Sun
- Department of Obstetrics and Gynecology, Shandong Obstetrics and Gynecology Hospital, Jinan, China
| | - Wenzhi Li
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China.,Key Laboratory of Gynecologic Oncology of Shandong Province, Qilu Hospital of Shandong University, Jinan, China
| | - Jie Jiang
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China
| | - Jun-Ming Zhang
- Pain Research Center, Department of Anesthesiology, University of Cincinnati College of Medicine, Cincinnati, OH, United States
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110
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Magaz A, Faroni A, Gough JE, Reid AJ, Li X, Blaker JJ. Bioactive Silk-Based Nerve Guidance Conduits for Augmenting Peripheral Nerve Repair. Adv Healthc Mater 2018; 7:e1800308. [PMID: 30260575 DOI: 10.1002/adhm.201800308] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 05/22/2018] [Indexed: 02/03/2023]
Abstract
Repair of peripheral nerve injuries depends upon complex biology stemming from the manifold and challenging injury-healing processes of the peripheral nervous system. While surgical treatment options are available, they tend to be characterized by poor clinical outcomes for the injured patients. This is particularly apparent in the clinical management of a nerve gap whereby nerve autograft remains the best clinical option despite numerous limitations; in addition, effective repair becomes progressively more difficult with larger gaps. Nerve conduit strategies based on tissue engineering approaches and the use of silk as scaffolding material have attracted much attention in recent years to overcome these limitations and meet the clinical demand of large gap nerve repair. This review examines the scientific advances made with silk-based conduits for peripheral nerve repair. The focus is on enhancing bioactivity of the conduits in terms of physical guidance cues, inner wall and lumen modification, and imbuing novel conductive functionalities.
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Affiliation(s)
- Adrián Magaz
- Bio‐Active Materials GroupSchool of MaterialsMSS TowerThe University of Manchester Manchester M13 9PL UK
- Institute of Materials Research and Engineering (IMRE)Agency for Science Technology and Research (A*STAR) 2 Fusionopolis, Way, Innovis #08‐03 Singapore 138634 Singapore
| | - Alessandro Faroni
- Blond McIndoe LaboratoriesDivision of Cell Matrix Biology and Regenerative MedicineSchool of Biological SciencesFaculty of Biology, Medicine and HealthThe University of ManchesterManchester Academic Health Science Centre Manchester M13 9PL UK
| | - Julie E. Gough
- School of MaterialsThe University of Manchester Manchester M13 9PL UK
| | - Adam J. Reid
- Blond McIndoe LaboratoriesDivision of Cell Matrix Biology and Regenerative MedicineSchool of Biological SciencesFaculty of Biology, Medicine and HealthThe University of ManchesterManchester Academic Health Science Centre Manchester M13 9PL UK
- Department of Plastic Surgery and BurnsWythenshawe HospitalManchester University NHS Foundation TrustManchester Academic Health Science Centre Manchester M23 9LT UK
| | - Xu Li
- Institute of Materials Research and Engineering (IMRE)Agency for Science Technology and Research (A*STAR) 2 Fusionopolis, Way, Innovis #08‐03 Singapore 138634 Singapore
| | - Jonny J. Blaker
- Bio‐Active Materials GroupSchool of MaterialsMSS TowerThe University of Manchester Manchester M13 9PL UK
- School of MaterialsThe University of Manchester Manchester M13 9PL UK
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111
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Gökbuget D, Pereira JA, Opitz L, Christe D, Kessler T, Marchais A, Suter U. The miRNA biogenesis pathway prevents inappropriate expression of injury response genes in developing and adult Schwann cells. Glia 2018; 66:2632-2644. [PMID: 30295958 PMCID: PMC6585637 DOI: 10.1002/glia.23516] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 07/18/2018] [Accepted: 07/18/2018] [Indexed: 12/24/2022]
Abstract
Proper function of the nervous system depends on myelination. In peripheral nerves, Schwann cells (SCs) myelinate axons and the miRNA biogenesis pathway is required for developmental myelination and myelin maintenance. However, regulatory roles of this pathway at different stages of myelination are only partially understood. We addressed the requirement of the core miRNA biogenesis pathway components Dgcr8, Drosha, and Dicer in developing and adult SCs using mouse mutants with a comparative genetics and transcriptomics approach. We found that the microprocessor components Dgcr8 and Drosha are crucial for axonal radial sorting and to establish correct SC numbers upon myelination. Transcriptome analyses revealed a requirement of the microprocessor to prevent aberrantly increased expression of injury-response genes. Those genes are predicted targets of abundant miRNAs in sciatic nerves (SNs) during developmental myelination. In agreement, Dgcr8 and Dicer are required for proper maintenance of the myelinated SC state, where abundant miRNAs in adult SNs are predicted to target injury-response genes. We conclude that the miRNA biogenesis pathway in SCs is crucial for preventing inappropriate activity of injury-response genes in developing and adult SCs.
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Affiliation(s)
- Deniz Gökbuget
- ETH Zurich, Department of BiologyInstitute of Molecular Health SciencesZurichSwitzerland
| | - Jorge A. Pereira
- ETH Zurich, Department of BiologyInstitute of Molecular Health SciencesZurichSwitzerland
| | - Lennart Opitz
- ETH Zurich/University of ZurichFunctional Genomics Center ZurichZurichSwitzerland
| | - Dominik Christe
- ETH Zurich, Department of BiologyInstitute of Molecular Health SciencesZurichSwitzerland
| | - Tobias Kessler
- ETH Zurich, Department of BiologyInstitute of Molecular Health SciencesZurichSwitzerland
| | - Antonin Marchais
- ETH Zurich, Department of BiologyInstitute of Agricultural SciencesZurichSwitzerland
| | - Ueli Suter
- ETH Zurich, Department of BiologyInstitute of Molecular Health SciencesZurichSwitzerland
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112
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Schwann Cell Transplantation Subdues the Pro-Inflammatory Innate Immune Cell Response after Spinal Cord Injury. Int J Mol Sci 2018; 19:ijms19092550. [PMID: 30154346 PMCID: PMC6163303 DOI: 10.3390/ijms19092550] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Revised: 08/20/2018] [Accepted: 08/22/2018] [Indexed: 12/12/2022] Open
Abstract
The transplantation of Schwann cells (SCs) has been shown to provide tissue preservation and support axon growth and remyelination as well as improve functional recovery across a diverse range of experimental spinal cord injury (SCI) paradigms. The autologous use of SCs has progressed to Phase 1 SCI clinical trials in humans where their use has been shown to be both feasible and safe. The contribution of immune modulation to the protective and reparative actions of SCs within the injured spinal cord remains largely unknown. In the current investigation, the ability of SC transplants to alter the innate immune response after contusive SCI in the rat was examined. SCs were intraspinally transplanted into the lesion site at 1 week following a thoracic (T8) contusive SCI. Multicolor flow cytometry and immunohistochemical analysis of specific phenotypic markers of pro- and anti-inflammatory microglia and macrophages as well as cytokines at 1 week after SC transplantation was employed. The introduction of SCs significantly attenuated the numbers of cluster of differentiation molecule 11B (CD11b)+, cluster of differentiation molecule 68 (CD68)+, and ionized calcium-binding adapter molecule 1 (Iba1)+ immune cells within the lesion implant site, particularly those immunoreactive for the pro-inflammatory marker, inducible nitric oxide synthase (iNOS). Whereas numbers of anti-inflammatory CD68+ Arginase-1 (Arg1+) iNOS− cells were not altered by SC transplantation, CD68+ cells of an intermediate, Arg1+ iNOS+ phenotype were increased by the introduction of SCs into the injured spinal cord. The morphology of Iba1+ immune cells was also markedly altered in the SC implant, being elongated and in alignment with SCs and in-growing axons versus their amoeboid form after SCI alone. Examination of pro-inflammatory cytokines, tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β), and anti-inflammatory cytokines, interleukin-4 (IL-4) and interleukin-10 (IL-10), by multicolor flow cytometry analysis showed that their production in CD11b+ cells was unaltered by SC transplantation at 1 week post-transplantation. The ability of SCs to subdue the pro-inflammatory iNOS+ microglia and macrophage phenotype after intraspinal transplantation may provide an important contribution to the neuroprotective effects of SCs within the sub-acute SCI setting.
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113
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Deng B, Lv W, Duan W, Liu Y, Li Z, Song X, Cui C, Qi X, Wang X, Li C. FGF9 modulates Schwann cell myelination in developing nerves and induces a pro‐inflammatory environment during injury. J Cell Biochem 2018; 119:8643-8658. [PMID: 29953642 DOI: 10.1002/jcb.27105] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Accepted: 05/07/2018] [Indexed: 01/12/2023]
Affiliation(s)
- Binbin Deng
- Department of Neurology Second Hospital of Hebei Medical University Shijiazhuang China
- Department of Neurology The First Affiliated Hospital of Wenzhou Medical University Wenzhou Zhejiang China
| | - Wenjing Lv
- Department of Neurology Second Hospital of Hebei Medical University Shijiazhuang China
| | - Weisong Duan
- Department of Neurology Second Hospital of Hebei Medical University Shijiazhuang China
- Neurological Laboratory of Hebei Province Shijiazhuang China
| | - Yakun Liu
- Department of Neurology Second Hospital of Hebei Medical University Shijiazhuang China
| | - Zhongyao Li
- Department of Neurology Second Hospital of Hebei Medical University Shijiazhuang China
| | - Xueqing Song
- Department of Neurology Second Hospital of Hebei Medical University Shijiazhuang China
| | - Can Cui
- Department of Neurology Second Hospital of Hebei Medical University Shijiazhuang China
| | - Xiaoming Qi
- Department of Neurology Second Hospital of Hebei Medical University Shijiazhuang China
| | - Xiaoxiao Wang
- Department of Neurology Second Hospital of Hebei Medical University Shijiazhuang China
| | - Chunyan Li
- Department of Neurology Second Hospital of Hebei Medical University Shijiazhuang China
- Neurological Laboratory of Hebei Province Shijiazhuang China
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114
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Tomlinson JE, Žygelytė E, Grenier JK, Edwards MG, Cheetham J. Temporal changes in macrophage phenotype after peripheral nerve injury. J Neuroinflammation 2018; 15:185. [PMID: 29907154 PMCID: PMC6003127 DOI: 10.1186/s12974-018-1219-0] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 05/29/2018] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Macrophages play a key role in peripheral nerve repair and demonstrate complex phenotypes that are highly dependent on microenvironmental cues. METHODS We determined temporal changes in macrophage gene expression over time using RNA sequencing after fluorescence-activated cell sorting (FACS) macrophage populations from injured peripheral nerve. We identified key upstream regulators and dominant pathways using ingenuity pathway analysis and confirmed these changes with NanoString technology. We then investigate the effects of extreme polarizers of macrophage phenotype (IL4 and IFNγ) on nerve regeneration. We determined macrophage gene expression in vivo at the site of peripheral nerve injury with NanoString technology, and assessed recovery from sciatic nerve injury by cranial tibial muscle weights and retrograde labeling motor neurons in mice with deletion of IL4 or IFNγ receptors. RESULTS We demonstrate that IL4R and IFNγR deletions provide complementary responses to polarization, and alter expression of genes associated with angiogenesis and axonal extension, but do not influence recovery from peripheral nerve transection at 8 weeks after repair. CONCLUSIONS Overall, this study provides a framework to evaluate the phenotype of macrophages over time, and provides a broader and more precise assessment of gene expression changes than has previously been commonly used. This data suggests ways in which polarization may be modulated to improve repair.
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Affiliation(s)
- Joy E. Tomlinson
- Cornell University College of Veterinary Medicine, Ithaca, NY USA
| | - Emilija Žygelytė
- Cornell University College of Veterinary Medicine, Ithaca, NY USA
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Gpr126 Is Critical for Schwann Cell Function during Peripheral Nerve Regeneration. J Neurosci 2018; 37:3106-3108. [PMID: 28330980 DOI: 10.1523/jneurosci.0127-17.2017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Revised: 02/22/2017] [Accepted: 02/25/2017] [Indexed: 11/21/2022] Open
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116
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Sulaiman W, Dreesen T, Nguyen D. Single Local Application of TGF-β Promotes a Proregenerative State Throughout a Chronically Injured Nerve. Neurosurgery 2018; 82:894-902. [PMID: 28973496 DOI: 10.1093/neuros/nyx362] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 06/06/2017] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND The lack of nerve regeneration and functional recovery occurs frequently when injuries involve large nerve trunks because insufficient mature axons reach their targets in the distal stump and because of the loss of neurotrophic support, primarily from Schwann cells (SCs). OBJECTIVE To investigate whether a single application of transforming growth factor-beta (TGF-β) plus forskolin or forskolin alone can promote and support axonal regeneration through the distal nerve stump. METHODS Using a delayed repair rat model of nerve injury, we transected the tibial nerve. After 8 wk, end-to-end repair was done and the repair site was treated with saline, forskolin, or TGF- β plus forskolin. After 6 wk, nerve sections consisting of the proximal stump, distal to the site of repair, and the most distal part of the nerve stump were removed for nerve histology, axon counts, and immunohistochemistry for activated SCs (S100), macrophages (CD68), cell proliferation (Ki67), p75NGFR, and apoptosis (activated caspase-3). RESULTS TGF-β plus forskolin significantly increased the numbers of axons regenerated distal to the repair site and the most distal nerve sections. Both treatments significantly increased the numbers of axons regenerated in the most distal nerve sections compared to saline treated. Both treatments exhibited extended expression of regeneration-associated marker proteins. CONCLUSION TGF-β plus forskolin treatment of chronically injured nerve improved axonal regeneration and increased expression of regeneration-associated proteins beyond the repair site. This suggests that a single application at the site of repair has mitogenic effects that extended distally and may potentially overcome the decrease in regenerated axon over long distance.
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Affiliation(s)
- Wale Sulaiman
- Department of Neurosurgery, Back and Spine Center, Ochsner Neuroscience Institute, Ochsner Health System, and Tulane University Medical Center, New Orleans, Louisiana.,Laboratory of Neural Injury and Regeneration, Institute of Translational Research, Ochsner Medical Center, New Orleans, Louisiana
| | - Thomas Dreesen
- Laboratory of Neural Injury and Regeneration, Institute of Translational Research, Ochsner Medical Center, New Orleans, Louisiana
| | - Doan Nguyen
- Laboratory of Neural Injury and Regeneration, Institute of Translational Research, Ochsner Medical Center, New Orleans, Louisiana
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117
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Hu D, Nicholls PK, Yin C, Kelman K, Yuan Q, Greene WK, Shi Z, Ma B. Immunofluorescent Localization of Non-myelinating Schwann Cells and Their Interactions With Immune Cells in Mouse Thymus. J Histochem Cytochem 2018; 66:775-785. [PMID: 29775115 DOI: 10.1369/0022155418778543] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The thymus is innervated by sympathetic/parasympathetic nerve fibers from the peripheral nervous system (PNS), suggesting a neural regulation of thymic function including T-cell development. Despite some published studies, data on the innervation and nerve-immune interaction inside the thymus remain limited. In the present study, we used immunofluorescent staining of glial fibrillary acidic protein (GFAP) coupled with confocal microscopy/three-dimensional (3D) reconstruction to reveal the distribution of non-myelinating Schwann cells (NMSC) and their interactions with immune cells inside mouse thymus. Our results demonstrate (1) the presence of an extensive network of NMSC processes in all compartments of the thymus including the capsule, subcapsular region, cortex, cortico-medullary junction, and medulla; (2) close associations/interactions of NMSC processes with blood vessels, indicating the neural control of blood flow inside the thymus; (3) the close "synapse-like" association of NMSC processes with various subsets of dendritic cells (DC; e.g., B220+ DCs, CD4+ DCs, and CD8+ DCs), and lymphocytes (B cells, CD4+/CD8+ thymocytes). Our novel findings concerning the distribution of NMSCs and the associations of NMSCs and immune cells inside mouse thymus should help us understand the anatomical basis and the mechanisms through which the PNS affects T-cell development and thymic endocrine function in health and disease.
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Affiliation(s)
- Dailun Hu
- Clinical College, Hebei Medical University, Shijiazhuang, China
| | - Philip K Nicholls
- School of Veterinary and Life Sciences, Murdoch University, Murdoch, Australia
| | - Changfu Yin
- Clinical College, Hebei Medical University, Shijiazhuang, China
| | - Khama Kelman
- School of Veterinary and Life Sciences, Murdoch University, Murdoch, Australia
| | - Qionglan Yuan
- School of Medicine, Tongji University, Shanghai, China
| | - Wayne K Greene
- School of Veterinary and Life Sciences, Murdoch University, Murdoch, Australia
| | - Zhongli Shi
- Clinical College, Hebei Medical University, Shijiazhuang, China
| | - Bin Ma
- School of Veterinary and Life Sciences, Murdoch University, Murdoch, Australia
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118
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Norrmén C, Figlia G, Pfistner P, Pereira JA, Bachofner S, Suter U. mTORC1 Is Transiently Reactivated in Injured Nerves to Promote c-Jun Elevation and Schwann Cell Dedifferentiation. J Neurosci 2018; 38:4811-4828. [PMID: 29695414 PMCID: PMC5956991 DOI: 10.1523/jneurosci.3619-17.2018] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 04/14/2018] [Accepted: 04/21/2018] [Indexed: 12/31/2022] Open
Abstract
Schwann cells (SCs) are endowed with a remarkable plasticity. When peripheral nerves are injured, SCs dedifferentiate and acquire new functions to coordinate nerve repair as so-called repair SCs. Subsequently, SCs redifferentiate to remyelinate regenerated axons. Given the similarities between SC dedifferentiation/redifferentiation in injured nerves and in demyelinating neuropathies, elucidating the signals involved in SC plasticity after nerve injury has potentially wider implications. c-Jun has emerged as a key transcription factor regulating SC dedifferentiation and the acquisition of repair SC features. However, the upstream pathways that control c-Jun activity after nerve injury are largely unknown. We report that the mTORC1 pathway is transiently but robustly reactivated in dedifferentiating SCs. By inducible genetic deletion of the functionally crucial mTORC1-subunit Raptor in mouse SCs (including male and female animals), we found that mTORC1 reactivation is necessary for proper myelin clearance, SC dedifferentiation, and consequently remyelination, without major alterations in the inflammatory response. In the absence of mTORC1 signaling, c-Jun failed to be upregulated correctly. Accordingly, a c-Jun binding motif was found to be enriched in promoters of genes with reduced expression in injured mutants. Furthermore, using cultured SCs, we found that mTORC1 is involved in c-Jun regulation by promoting its translation, possibly via the eIF4F-subunit eIF4A. These results provide evidence that proper c-Jun elevation after nerve injury involves also mTORC1-dependent post-transcriptional regulation to ensure timely dedifferentiation of SCs.SIGNIFICANCE STATEMENT A crucial evolutionary acquisition of vertebrates is the envelopment of axons in myelin sheaths produced by oligodendrocytes in the CNS and Schwann cells (SCs) in the PNS. When myelin is damaged, conduction of action potentials along axons slows down or is blocked, leading to debilitating diseases. Unlike oligodendrocytes, SCs have a high regenerative potential, granted by their remarkable plasticity. Thus, understanding the mechanisms underlying SC plasticity may uncover new therapeutic targets in nerve regeneration and demyelinating diseases. Our work reveals that reactivation of the mTORC1 pathway in SCs is essential for efficient SC dedifferentiation after nerve injury. Accordingly, modulating this signaling pathway might be of therapeutic relevance in peripheral nerve injury and other diseases.
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Affiliation(s)
- Camilla Norrmén
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology, ETH Zürich, Zürich CH-8093, Switzerland
| | - Gianluca Figlia
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology, ETH Zürich, Zürich CH-8093, Switzerland
| | - Patrick Pfistner
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology, ETH Zürich, Zürich CH-8093, Switzerland
| | - Jorge A Pereira
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology, ETH Zürich, Zürich CH-8093, Switzerland
| | - Sven Bachofner
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology, ETH Zürich, Zürich CH-8093, Switzerland
| | - Ueli Suter
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology, ETH Zürich, Zürich CH-8093, Switzerland
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119
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Wang Y, Liu Y, Zhai J, Duan W, Sun S, Cui H, Chen X, Ji J, Liu Y. scAAV9-VEGF-165 inhibits neuroinflammatory responses and invasion of macrophages into the peripheral nervous system of ALS transgenic mice. Brain Res Bull 2018; 140:233-242. [PMID: 29751031 DOI: 10.1016/j.brainresbull.2018.05.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 05/05/2018] [Accepted: 05/06/2018] [Indexed: 02/07/2023]
Abstract
Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disorder that leads to paralysis and death within 3-5 years. Although the vast majority of studies have focused on vulnerable neurons, growing evidence has shown that non-neuronal cells contribute to the pathogenesis and disease progression. Here, we showed that intrathecal injection of scAAV9-VEGF at 60 days of age significantly reduced the number of microglia and inhibited the neuroinflammatory response in the CNS. Meanwhile, we found that administration of VEGF inhibited the invasion of macrophages into the PNS, including ventral nerve roots, sciatic nerves and muscles. Overall, our study indicated the anti-inflammation effect of VEGF in the CNS and PNS of ALS mice when delivered by intrathecal injection.
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Affiliation(s)
- Ying Wang
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, People's Republic of China; Department of Neurology, The Central Hospital of Zibo, Zibo, Shandong, 255000, People's Republic of China
| | - Yuanyuan Liu
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, People's Republic of China
| | - Jingxu Zhai
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, People's Republic of China
| | - Weisong Duan
- Neurological Laboratory of Hebei Province, Shijiazhuang, Hebei, 050000, People's Republic of China
| | - Shuo Sun
- Department of Neurosurgery, The Central Hospital of Zibo, Zibo, Shandong, 255000, People's Republic of China
| | - Hongying Cui
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, People's Republic of China
| | - Xuexiao Chen
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, People's Republic of China
| | - Jianwen Ji
- Center of Neurology Disease, The Third Hospital of Chongqing Medical University, Chongqing, 404000, People's Republic of China
| | - Yaling Liu
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, People's Republic of China; Institute of Cardiocerebrovascular Disease, West Heping Road 215, Shijiazhuang, Hebei, 050000, People's Republic of China; Neurological Laboratory of Hebei Province, Shijiazhuang, Hebei, 050000, People's Republic of China.
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120
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Boldyreva M, Bondar I, Stafeev I, Makarevich P, Beloglazova I, Zubkova E, Shevchenko E, Molokotina Y, Karagyaur M, Rаtner Е, Parfyonova YV. Plasmid-based gene therapy with hepatocyte growth factor stimulates peripheral nerve regeneration after traumatic injury. Biomed Pharmacother 2018. [DOI: 10.1016/j.biopha.2018.02.138] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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121
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Macrophage Depletion Ameliorates Peripheral Neuropathy in Aging Mice. J Neurosci 2018; 38:4610-4620. [PMID: 29712789 DOI: 10.1523/jneurosci.3030-17.2018] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 02/06/2018] [Accepted: 03/09/2018] [Indexed: 01/02/2023] Open
Abstract
Aging is known as a major risk factor for the structure and function of the nervous system. There is urgent need to overcome such deleterious effects of age-related neurodegeneration. Here we show that peripheral nerves of 24-month-old aging C57BL/6 mice of either sex show similar pathological alterations as nerves from aging human individuals, whereas 12-month-old adult mice lack such alterations. Specifically, nerve fibers showed demyelination, remyelination and axonal lesion. Moreover, in the aging mice, neuromuscular junctions showed features typical for dying-back neuropathies, as revealed by a decline of presynaptic markers, associated with α-bungarotoxin-positive postsynapses. In line with these observations were reduced muscle strengths. These alterations were accompanied by elevated numbers of endoneurial macrophages, partially comprising the features of phagocytosing macrophages. Comparable profiles of macrophages could be identified in peripheral nerve biopsies of aging persons. To determine the pathological impact of macrophages in aging mice, we selectively targeted the cells by applying an orally administered CSF-1R specific kinase (c-FMS) inhibitor. The 6-month-lasting treatment started before development of degenerative changes at 18 months and reduced macrophage numbers in mice by ∼70%, without side effects. Strikingly, nerve structure was ameliorated and muscle strength preserved. We show, for the first time, that age-related degenerative changes in peripheral nerves are driven by macrophages. These findings may pave the way for treating degeneration in the aging peripheral nervous system by targeting macrophages, leading to reduced weakness, improved mobility, and eventually increased quality of life in the elderly.SIGNIFICANCE STATEMENT Aging is a major risk factor for the structure and function of the nervous system. Here we show that peripheral nerves of 24-month-old aging mice show similar degenerative alterations as nerves from aging human individuals. Both in mice and humans, these alterations were accompanied by endoneurial macrophages. To determine the pathological impact of macrophages in aging mice, we selectively targeted the cells by blocking a cytokine receptor, essential for macrophage survival. The treatment strongly reduced macrophage numbers and substantially improved nerve structure and muscle strength. We show, for the first time, that age-related degenerative changes in peripheral nerves are driven by macrophages. These findings may be helpful for treatment weakness and reduced mobility in the elderly.
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122
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Ma B, Yin C, Hu D, Newman M, Nicholls PK, Wu Z, Greene WK, Shi Z. Distribution of non-myelinating Schwann cells and their associations with leukocytes in mouse spleen revealed by immunofluorescence staining. Eur J Histochem 2018; 62:2890. [PMID: 29943953 PMCID: PMC6038114 DOI: 10.4081/ejh.2018.2890] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 03/06/2018] [Accepted: 03/09/2018] [Indexed: 12/31/2022] Open
Abstract
The nervous system and the immune system communicate extensively with each other in order to maintain homeostasis and to regulate the immune response. The peripheral nervous system (PNS) communicates specifically with the immune system according to local interactions, including the “hardwiring” of sympathetic/parasympathetic (efferent) and sensory nerves (afferent) to lymphoid tissue and organs. To reveal this type of bidirectional neuroimmune interaction at the microscopic level, we used immunofluorescent staining of glial fibrillary acidic protein (GFAP) coupled with confocal microscopy/3D reconstruction to reveal the distribution of nonmyelinating Schwann cells (NMSCs) and their interactions with immune cells inside mouse spleen. Our results demonstrate i) the presence of an extensive network of NMSC processes in all splenic compartments including the splenic nodules, periarteriolar lymphoid sheath (PALS), marginal zone, trabecula, and red pulp; ii) the close association of NMSC processes with blood vessels (including central arteries and their branches, marginal sinuses, penicillar arterioles and splenic sinuses); iii) the close “synapse-like” interaction/association of NMSC processes with various subsets of dendritic cells (DCs; e.g., CD4+CD11c+ DCs, B220+CD11c+ DCs, and F4/80+ CD11c+ DCs), macrophages (F4/80+), and lymphocytes (B cells, CD4+ T helper cells). Our novel findings concerning the distribution of NMSCs and NMSC-leukocytes interactions inside mouse spleen should improve our understanding of the mechanisms through which the PNS affects cellular- and humoral-mediated immune responses in a variety of health conditions and infectious/non-infectious diseases.
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Affiliation(s)
- Bin Ma
- Murdoch University, School of Veterinary and Life Sciences.
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123
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Genipin-Cross-Linked Chitosan Nerve Conduits Containing TNF-α Inhibitors for Peripheral Nerve Repair. Ann Biomed Eng 2018; 46:1013-1025. [PMID: 29603044 DOI: 10.1007/s10439-018-2011-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 03/21/2018] [Indexed: 01/23/2023]
Abstract
Tissue engineered nerve grafts (TENGs) are considered a promising alternative to autologous nerve grafting, which is considered the "gold standard" clinical strategy for peripheral nerve repair. Here, we immobilized tumor necrosis factor-α (TNF-α) inhibitors onto a nerve conduit, which was introduced into a chitosan (CS) matrix scaffold utilizing genipin (GP) as the crosslinking agent, to fabricate CS-GP-TNF-α inhibitor nerve conduits. The in vitro release kinetics of TNF-α inhibitors from the CS-GP-TNF-α inhibitor nerve conduits were investigated using high-performance liquid chromatography. The in vivo continuous release profile of the TNF-α inhibitors released from the CS-GP-TNF-α inhibitor nerve conduits was measured using an enzyme-linked immunosorbent assay over 14 days. We found that the amount of TNF-α inhibitors released decreased with time after the bridging of the sciatic nerve defects in rats. Moreover, 4 and 12 weeks after surgery, histological analyses and functional evaluations were carried out to assess the influence of the TENG on regeneration. Immunochemistry performed 4 weeks after grafting to assess early regeneration outcomes revealed that the TENG strikingly promoted axonal outgrowth. Twelve weeks after grafting, the TENG accelerated myelin sheath formation, as well as functional restoration. In general, the regenerative outcomes following TENG more closely paralleled findings observed with autologous grafting than the use of the CS matrix scaffold. Collectively, our data indicate that the CS-GP-TNF-α inhibitor nerve conduits comprised an elaborate system for sustained release of TNF-α inhibitors in vitro, while studies in vivo demonstrated that the TENG could accelerate regenerating axonal outgrowth and functional restoration. The introduction of CS-GP-TNF-α-inhibitor nerve conduits into a scaffold may contribute to an efficient and adaptive immune microenvironment that can be used to facilitate peripheral nerve repair.
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124
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Hinder LM, Murdock BJ, Park M, Bender DE, O'Brien PD, Rumora AE, Hur J, Feldman EL. Transcriptional networks of progressive diabetic peripheral neuropathy in the db/db mouse model of type 2 diabetes: An inflammatory story. Exp Neurol 2018; 305:33-43. [PMID: 29550371 DOI: 10.1016/j.expneurol.2018.03.011] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 02/14/2018] [Accepted: 03/13/2018] [Indexed: 12/13/2022]
Abstract
Diabetic peripheral neuropathy is the most common complication of diabetes and a source of considerable morbidity. Numerous molecular pathways are linked to neuropathic progression, but it is unclear whether these pathways are altered throughout the course of disease. Moreover, the methods by which these molecular pathways are analyzed can produce significantly different results; as such it is often unclear whether previously published pathways are viable targets for novel therapeutic approaches. In the current study we examine changes in gene expression patterns in the sciatic nerve (SCN) and dorsal root ganglia (DRG) of db/db diabetic mice at 8, 16, and 24 weeks of age using microarray analysis. Following the collection and verification of gene expression data, we utilized both self-organizing map (SOM) analysis and differentially expressed gene (DEG) analysis to detect pathways that were altered at all time points. Though there was some variability between SOM and DEG analyses, we consistently detected altered immune pathways in both the SCN and DRG over the course of disease. To support these results, we further used multiplex analysis to assess protein changes in the SCN of diabetic mice; we found that multiple immune molecules were upregulated at both early and later stages of disease. In particular, we found that matrix metalloproteinase-12 was highly upregulated in microarray and multiplex data sets suggesting it may play a role in disease progression.
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Affiliation(s)
- Lucy M Hinder
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109-2200, USA
| | - Benjamin J Murdock
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109-2200, USA
| | - Meeyoung Park
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109-2200, USA
| | - Diane E Bender
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109-2200, USA
| | - Phillipe D O'Brien
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109-2200, USA
| | - Amy E Rumora
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109-2200, USA
| | - Junguk Hur
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203-9037, USA
| | - Eva L Feldman
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109-2200, USA.
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125
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EGFP transgene: a useful tool to track transplanted bone marrow mononuclear cell contribution to peripheral remyelination. Transgenic Res 2018; 27:135-153. [DOI: 10.1007/s11248-018-0062-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 02/01/2018] [Indexed: 12/14/2022]
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126
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Bakst RL, Xiong H, Chen CH, Deborde S, Lyubchik A, Zhou Y, He S, McNamara W, Lee SY, Olson OC, Leiner IM, Marcadis AR, Keith JW, Al-Ahmadie HA, Katabi N, Gil Z, Vakiani E, Joyce JA, Pamer E, Wong RJ. Inflammatory Monocytes Promote Perineural Invasion via CCL2-Mediated Recruitment and Cathepsin B Expression. Cancer Res 2017; 77:6400-6414. [PMID: 28951461 PMCID: PMC5831809 DOI: 10.1158/0008-5472.can-17-1612] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 08/21/2017] [Accepted: 09/18/2017] [Indexed: 12/14/2022]
Abstract
Perineural invasion (PNI) is an ominous event strongly linked to poor clinical outcome. Cells residing within peripheral nerves collaborate with cancer cells to enable PNI, but the contributing conditions within the tumor microenvironment are not well understood. Here, we show that CCR2-expressing inflammatory monocytes (IM) are preferentially recruited to sites of PNI, where they differentiate into macrophages and potentiate nerve invasion through a cathepsin B-mediated process. A series of adoptive transfer experiments with genetically engineered donors and recipients demonstrated that IM recruitment to nerves was driven by CCL2 released from Schwann cells at the site of PNI, but not CCL7, an alternate ligand for CCR2. Interruption of either CCL2-CCR2 signaling or cathepsin B function significantly impaired PNI in vivo Correlative studies in human specimens demonstrated that cathepsin B-producing macrophages were enriched in invaded nerves, which was associated with increased local tumor recurrence. These findings deepen our understanding of PNI pathogenesis and illuminate how PNI is driven in part by corruption of a nerve repair program. Further, they support the exploration of inhibiting IM recruitment and function as a targeted therapy for PNI. Cancer Res; 77(22); 6400-14. ©2017 AACR.
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MESH Headings
- Animals
- Cathepsin B/metabolism
- Cell Line
- Cell Line, Tumor
- Chemokine CCL2/genetics
- Chemokine CCL2/metabolism
- Humans
- Macrophages/metabolism
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Nude
- Monocytes/metabolism
- Monocytes/pathology
- Neoplasm Invasiveness
- Neoplasms, Experimental/genetics
- Neoplasms, Experimental/metabolism
- Neoplasms, Experimental/pathology
- Pancreatic Neoplasms/genetics
- Pancreatic Neoplasms/metabolism
- Pancreatic Neoplasms/pathology
- Peripheral Nerves/metabolism
- Peripheral Nerves/pathology
- Receptors, CCR2/genetics
- Receptors, CCR2/metabolism
- Schwann Cells/metabolism
- Transplantation, Heterologous
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Affiliation(s)
- Richard L Bakst
- Department of Radiation Oncology, Mount Sinai School of Medicine, New York, New York
| | - Huizhong Xiong
- Immunology Program, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Chun-Hao Chen
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Sylvie Deborde
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Anna Lyubchik
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Yi Zhou
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Shizhi He
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - William McNamara
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Sei-Young Lee
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Oakley C Olson
- Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Ingrid M Leiner
- Immunology Program, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Andrea R Marcadis
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - James W Keith
- Immunology Program, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Hikmat A Al-Ahmadie
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Nora Katabi
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Ziv Gil
- Department of Otolaryngology, Rambam Healthcare Campus, The Technion-Israel Institute of Technology, Haifa, Israel
| | - Efsevia Vakiani
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Johanna A Joyce
- Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, New York, New York
- Ludwig Institute for Cancer Research, University of Lausanne, Lausanne, Switzerland
| | - Eric Pamer
- Immunology Program, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Richard J Wong
- Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York.
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127
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Tallon C, Farah MH. Beta secretase activity in peripheral nerve regeneration. Neural Regen Res 2017; 12:1565-1574. [PMID: 29171411 PMCID: PMC5696827 DOI: 10.4103/1673-5374.217319] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/26/2017] [Indexed: 12/13/2022] Open
Abstract
While the peripheral nervous system has the capacity to regenerate following a nerve injury, it is often at a slow rate and results in unsatisfactory recovery, leaving patients with reduced function. Many regeneration associated genes have been identified over the years, which may shed some insight into how we can manipulate this intrinsic regenerative ability to enhance repair following peripheral nerve injuries. Our lab has identified the membrane bound protease beta-site amyloid precursor protein-cleaving enzyme 1 (BACE1), or beta secretase, as a potential negative regulator of peripheral nerve regeneration. When beta secretase activity levels are abolished via a null mutation in mice, peripheral regeneration is enhanced following a sciatic nerve crush injury. Conversely, when activity levels are greatly increased by overexpressing beta secretase in mice, nerve regeneration and functional recovery are impaired after a sciatic nerve crush injury. In addition to our work, many substrates of beta secretase have been found to be involved in regulating neurite outgrowth and some have even been identified as regeneration associated genes. In this review, we set out to discuss BACE1 and its substrates with respect to axonal regeneration and speculate on the possibility of utilizing BACE1 inhibitors to enhance regeneration following acute nerve injury and potential uses in peripheral neuropathies.
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Affiliation(s)
- Carolyn Tallon
- Department of Neurology at Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Mohamed H. Farah
- Department of Neurology at Johns Hopkins School of Medicine, Baltimore, MD, USA
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128
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Directed Differentiation of Human Bone Marrow Stromal Cells to Fate-Committed Schwann Cells. Stem Cell Reports 2017; 9:1097-1108. [PMID: 28890164 PMCID: PMC5639182 DOI: 10.1016/j.stemcr.2017.08.004] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 08/11/2017] [Accepted: 08/11/2017] [Indexed: 12/14/2022] Open
Abstract
Our ultimate goal of in vitro derivation of Schwann cells (SCs) from adult bone marrow stromal cells (BMSCs) is such that they may be used autologously to assist post-traumatic nerve regeneration. Existing protocols for derivation of SC-like cells from BMSCs fall short in the stability of the acquired phenotype and the functional capacity to myelinate axons. Our experiments indicated that neuro-ectodermal progenitor cells among the human hBMSCs could be selectively expanded and then induced to differentiate into SC-like cells. Co-culture of the SC-like cells with embryonic dorsal root ganglion neurons facilitated contact-mediated signaling that accomplished the switch to fate-committed SCs. Microarray analysis and in vitro myelination provided evidence that the human BMSC-derived SCs were functionally mature. This was reinforced by repair and myelination phenotypes observable in vivo with the derived SCs seeded into a nerve guide as an implant across a critical gap in a rat model of sciatic nerve injury. A protocol for in vitro derivation of fate-committed SCs from human BMSCs The derived human SCs were functionally capable of myelination in vitro The derived human SCs guided axonal regrowth and formed compact myelin in vivo
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129
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Chucair-Elliott AJ, Gurung HR, Carr MM, Carr DJJ. Colony Stimulating Factor-1 Receptor Expressing Cells Infiltrating the Cornea Control Corneal Nerve Degeneration in Response to HSV-1 Infection. Invest Ophthalmol Vis Sci 2017; 58:4670-4682. [PMID: 28903153 PMCID: PMC5597033 DOI: 10.1167/iovs.17-22159] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 08/05/2017] [Indexed: 12/20/2022] Open
Abstract
Purpose Herpes simplex virus type-1 (HSV-1) is a leading cause of neurotrophic keratitis, characterized by decreased or absent corneal sensation due to damage to the sensory corneal innervation. We previously reported the elicited immune response to infection contributes to the mechanism of corneal nerve regression/damage during acute HSV-1 infection. Our aim is to further establish the involvement of infiltrated macrophages in the mechanism of nerve loss upon infection. Methods Macrophage Fas-Induced Apoptosis (MAFIA) transgenic C57BL/6 mice were systemically treated with AP20187 dimerizer or vehicle (VEH), and their corneas, lymph nodes, and blood were assessed for CD45+CD11b+GFP+ cell depletion by flow cytometry (FC). Mice were ocularly infected with HSV-1 or left uninfected. At 2, 4, and/or 6 days post infection (PI), corneas were assessed for sensitivity and harvested for FC, nerve structure by immunohistochemistry, viral content by plaque assay, soluble factor content by suspension array, and activation of signaling pathways by Western blot analysis. C57BL6 mice were used to compare to the MAFIA mouse model. Results MAFIA mice treated with AP20187 had efficient depletion of CD45+CD11b+GFP+ cells in the tissues analyzed. The reduction of CD45+CD11b+GFP+ cells recruited to the infected corneas of AP20187-treated mice correlated with preservation of corneal nerve structure and function, decreased protein concentration of inflammatory cytokines, and decreased STAT3 activation despite no changes in viral content in the cornea compared to VEH-treated animals. Conclusions Our results suggest infiltrated macrophages are early effectors in the nerve regression following HSV-1 infection. We propose the neurodegeneration mechanism involves macrophages, local up-regulation of IL-6, and activation of STAT3.
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Affiliation(s)
- Ana J Chucair-Elliott
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Hem R Gurung
- Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Meghan M Carr
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Daniel J J Carr
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
- Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
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130
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Madigan CA, Cambier CJ, Kelly-Scumpia KM, Scumpia PO, Cheng TY, Zailaa J, Bloom BR, Moody DB, Smale ST, Sagasti A, Modlin RL, Ramakrishnan L. A Macrophage Response to Mycobacterium leprae Phenolic Glycolipid Initiates Nerve Damage in Leprosy. Cell 2017; 170:973-985.e10. [PMID: 28841420 PMCID: PMC5848073 DOI: 10.1016/j.cell.2017.07.030] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Revised: 05/13/2017] [Accepted: 07/19/2017] [Indexed: 12/21/2022]
Abstract
Mycobacterium leprae causes leprosy and is unique among mycobacterial diseases in producing peripheral neuropathy. This debilitating morbidity is attributed to axon demyelination resulting from direct interaction of the M. leprae-specific phenolic glycolipid 1 (PGL-1) with myelinating glia and their subsequent infection. Here, we use transparent zebrafish larvae to visualize the earliest events of M. leprae-induced nerve damage. We find that demyelination and axonal damage are not directly initiated by M. leprae but by infected macrophages that patrol axons; demyelination occurs in areas of intimate contact. PGL-1 confers this neurotoxic response on macrophages: macrophages infected with M. marinum-expressing PGL-1 also damage axons. PGL-1 induces nitric oxide synthase in infected macrophages, and the resultant increase in reactive nitrogen species damages axons by injuring their mitochondria and inducing demyelination. Our findings implicate the response of innate macrophages to M. leprae PGL-1 in initiating nerve damage in leprosy.
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Affiliation(s)
- Cressida A Madigan
- Division of Dermatology, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Microbiology, Immunology, and Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Microbiology, University of Washington, Seattle, WA 98195, USA.
| | - C J Cambier
- Department of Immunology, University of Washington, Seattle, WA 98195, USA
| | - Kindra M Kelly-Scumpia
- Division of Dermatology, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Philip O Scumpia
- Division of Dermatology, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Tan-Yun Cheng
- Division of Rheumatology, Immunology, and Allergy, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Joseph Zailaa
- Department of Microbiology, Immunology, and Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Barry R Bloom
- Harvard School of Public Health, Boston, MA 02115, USA
| | - D Branch Moody
- Division of Rheumatology, Immunology, and Allergy, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Stephen T Smale
- Department of Microbiology, Immunology, and Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA; Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Alvaro Sagasti
- Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Robert L Modlin
- Division of Dermatology, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Microbiology, Immunology, and Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Lalita Ramakrishnan
- Department of Microbiology, University of Washington, Seattle, WA 98195, USA; Department of Immunology, University of Washington, Seattle, WA 98195, USA; Department of Medicine, University of Washington, Seattle, WA 98195, USA; MRC Laboratory of Molecular Biology, Molecular Immunity Unit, Department of Medicine, University of Cambridge, Cambridge CB2 OQH, UK.
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131
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Shi Z, Greene WK, Nicholls PK, Hu D, Tirnitz-Parker JEE, Yuan Q, Yin C, Ma B. Immunofluorescent characterization of non-myelinating Schwann cells and their interactions with immune cells in mouse mesenteric lymph node. Eur J Histochem 2017; 61:2827. [PMID: 29046050 PMCID: PMC5572407 DOI: 10.4081/ejh.2017.2827] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Revised: 07/22/2017] [Accepted: 07/24/2017] [Indexed: 02/08/2023] Open
Abstract
The central nervous system (CNS) influences the immune system in a general fashion by regulating the systemic concentration of humoral substances, whereas the autonomic nervous system communicates specifically with the immune system according to local interactions. Data concerning the mechanisms of this bidirectional crosstalk of the peripheral nervous system (PNS) and immune system remain limited. To gain a better understanding of local interactions of the PNS and immune system, we have used immunofluorescent staining of glial fibrillary acidic protein (GFAP), coupled with confocal microscopy, to investigate the non-myelinating Schwann cell (NMSC)-immune cell interactions in mouse mesenteric lymph nodes. Our results demonstrate i) the presence of extensive NMSC processes and even of cell bodies in each compartment of the mouse mesenteric lymph node; ii) close associations/interactions of NMSC processes with blood vessels (including high endothelial venules) and the lymphatic vessel/sinus; iii) close contacts/associations of NMSC processes with various subsets of dendritic cells (such as CD4+CD11c+, CD8+CD11c+ dendritic cells), macrophages (F4/80+ and CD11b+ macrophages), and lymphocytes. Our novel findings concerning the distribution of NMSCs and NMSC-immune cell interactions inside the mouse lymph node should help to elucidate the mechanisms through which the PNS affects cellular- and humoral-mediated immune responses or vice versa in health and disease.
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132
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Zhao Y, Wang Y, Gong J, Yang L, Niu C, Ni X, Wang Y, Peng S, Gu X, Sun C, Yang Y. Chitosan degradation products facilitate peripheral nerve regeneration by improving macrophage-constructed microenvironments. Biomaterials 2017; 134:64-77. [DOI: 10.1016/j.biomaterials.2017.02.026] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 02/20/2017] [Accepted: 02/21/2017] [Indexed: 10/20/2022]
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133
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Chen L, Cheng J, Yang X, Jin X, Qi Z, Jin YQ. Bone marrow-derived cells response in proximal regions of nerves after peripheral nerve injury. Cell Biol Int 2017; 41:863-870. [PMID: 28544161 DOI: 10.1002/cbin.10796] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 05/21/2017] [Indexed: 12/11/2022]
Affiliation(s)
- Lulu Chen
- Department No.16 of Plastic Surgery Hospital; Chinese Academy of Medical Sciences & Peking Union Medical College; Beijing China
| | - Jia Cheng
- Department of Burn and Plastic Surgery; Wuxi 3rd People's Hospital; Wuxi Jiangsu China
| | - Xiaonan Yang
- Department No.16 of Plastic Surgery Hospital; Chinese Academy of Medical Sciences & Peking Union Medical College; Beijing China
| | - Xiaolei Jin
- Department No.16 of Plastic Surgery Hospital; Chinese Academy of Medical Sciences & Peking Union Medical College; Beijing China
| | - Zuoliang Qi
- Department No.16 of Plastic Surgery Hospital; Chinese Academy of Medical Sciences & Peking Union Medical College; Beijing China
| | - Yu-Qing Jin
- Department of Plastic and Reconstructive Surgery; Shanghai 1st People's Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
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134
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Rateb EE, Amin SN, El-Tablawy N, Rashed LA, El-Attar S. Effect of melatonin supplemented at the light or dark period on recovery of sciatic nerve injury in rats. EXCLI JOURNAL 2017; 16:138-150. [PMID: 28435433 PMCID: PMC5379119 DOI: 10.17179/excli2016-763] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 01/03/2017] [Indexed: 01/07/2023]
Abstract
Peripheral nerve injuries can cause disabilities, social or economic problems. Melatonin, the secretory product of the pineal gland has antioxidant and anti-inflammatory actions. The aim of the present study was to investigate the effect of melatonin on the recovery of sciatic nerve after injury, comparing its effect when given in the light or the dark periods. Forty adult male Albino rats were allocated into four groups: control, nerve injury, nerve injury + melatonin given at light and nerve injury + melatonin given at dark. Nerve injury was initiated by clamping the sciatic nerve. Sciatic functional index (SFI) was measured preoperatively and postoperatively. Melatonin was given daily for six weeks. Recovery of the function was analyzed by functional analysis, electrophysiological analysis and biochemical measurement of Superoxide dismutase (SOD), Interleukin 1-beta (IL-1 β), Nerve growth factor (NGF), and bcl-2. Melatonin improved SFI, nerve conduction velocity (NCV) and the force of gastrocnemius muscle contraction as compared to the untreated rats. SOD activity, NGF, and bcl-2 were significantly increased, while IL-1β was significantly decreased after melatonin treatment as compared to the untreated injury group. SFI reached the control level; muscle contraction and IL-1B were significantly improved in the group treated with melatonin in the dark. Melatonin fastened the neural recovery and may be used in the treatment of nerve injury and it induced better nerve regeneration when the rats were treated during the dark period.
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Affiliation(s)
| | - Shaimaa Nasr Amin
- Department of Physiology, Kasr Al Ainy Faculty of Medicine, Cairo University, Egypt
| | - Nashwa El-Tablawy
- Department of Physiology, Kasr Al Ainy Faculty of Medicine, Cairo University, Egypt
| | - Laila Ahmed Rashed
- Department of Biochemistry, Kasr Al Ainy Faculty of Medicine, Cairo University, Egypt
| | - Samah El-Attar
- Department of Physiology, Kasr Al Ainy Faculty of Medicine, Cairo University, Egypt
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135
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Choi K, Komurov K, Fletcher JS, Jousma E, Cancelas JA, Wu J, Ratner N. An inflammatory gene signature distinguishes neurofibroma Schwann cells and macrophages from cells in the normal peripheral nervous system. Sci Rep 2017; 7:43315. [PMID: 28256556 PMCID: PMC5335359 DOI: 10.1038/srep43315] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 01/25/2017] [Indexed: 12/31/2022] Open
Abstract
Neurofibromas are benign peripheral nerve tumors driven by NF1 loss in Schwann cells (SCs). Macrophages are abundant in neurofibromas, and macrophage targeted interventions may have therapeutic potential in these tumors. We generated gene expression data from fluorescence-activated cell sorted (FACS) SCs and macrophages from wild-type and mutant nerve and neurofibroma to identify candidate pathways involved in SC-macrophage cross-talk. While in 1-month-old Nf1 mutant nerve neither SCs nor macrophages significantly differed from their normal counterparts, both macrophages and SCs showed significantly altered cytokine gene expression in neurofibromas. Computationally reconstructed SC-macrophage molecular networks were enriched for inflammation-associated pathways. We verified that neurofibroma SC conditioned medium contains macrophage chemo-attractants including colony stimulation factor 1 (CSF1). Network analysis confirmed previously implicated pathways and predict novel paracrine and autocrine loops involving cytokines, chemokines, and growth factors. Network analysis also predicted a central role for decreased type-I interferon signaling. We validated type-I interferon expression in neurofibroma by protein profiling, and show that treatment of neurofibroma-bearing mice with polyethylene glycolyated (PEGylated) type-I interferon-α2b reduces the expression of many cytokines overexpressed in neurofibroma. These studies reveal numerous potential targetable interactions between Nf1 mutant SCs and macrophages for further analyses.
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Affiliation(s)
- Kwangmin Choi
- Division of Experimental Hematology and Cancer Biology, Cancer and Blood Diseases Institute, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Kakajan Komurov
- Division of Experimental Hematology and Cancer Biology, Cancer and Blood Diseases Institute, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Jonathan S. Fletcher
- Division of Experimental Hematology and Cancer Biology, Cancer and Blood Diseases Institute, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Edwin Jousma
- Division of Experimental Hematology and Cancer Biology, Cancer and Blood Diseases Institute, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Jose A. Cancelas
- Division of Experimental Hematology and Cancer Biology, Cancer and Blood Diseases Institute, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati, Cincinnati, OH 45229, USA
- Hoxworth Blood Center, College of Medicine, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Jianqiang Wu
- Division of Experimental Hematology and Cancer Biology, Cancer and Blood Diseases Institute, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Nancy Ratner
- Division of Experimental Hematology and Cancer Biology, Cancer and Blood Diseases Institute, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati, Cincinnati, OH 45229, USA
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136
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Boerboom A, Dion V, Chariot A, Franzen R. Molecular Mechanisms Involved in Schwann Cell Plasticity. Front Mol Neurosci 2017; 10:38. [PMID: 28261057 PMCID: PMC5314106 DOI: 10.3389/fnmol.2017.00038] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 01/31/2017] [Indexed: 01/09/2023] Open
Abstract
Schwann cell incredible plasticity is a hallmark of the utmost importance following nerve damage or in demyelinating neuropathies. After injury, Schwann cells undergo dedifferentiation before redifferentiating to promote nerve regeneration and complete functional recovery. This review updates and discusses the molecular mechanisms involved in the negative regulation of myelination as well as in the reprogramming of Schwann cells taking place early following nerve lesion to support repair. Significant advance has been made on signaling pathways and molecular components that regulate SC regenerative properties. These include for instance transcriptional regulators such as c-Jun or Notch, the MAPK and the Nrg1/ErbB2/3 pathways. This comprehensive overview ends with some therapeutical applications targeting factors that control Schwann cell plasticity and highlights the need to carefully modulate and balance this capacity to drive nerve repair.
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Affiliation(s)
| | - Valérie Dion
- GIGA-Neurosciences, University of Liège Liège, Belgium
| | - Alain Chariot
- GIGA-Molecular Biology of Diseases, University of LiègeLiège, Belgium; Walloon Excellence in Lifesciences and Biotechnology (WELBIO)Wavre, Belgium
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137
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Mirfeizi L, Stratton JA, Kumar R, Shah P, Agabalyan N, Stykel MG, Midha R, Biernaskie J, Kallos MS. Serum-free bioprocessing of adult human and rodent skin-derived Schwann cells: implications for cell therapy in nervous system injury. J Tissue Eng Regen Med 2017; 11:3385-3397. [PMID: 28176458 DOI: 10.1002/term.2252] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Revised: 04/19/2016] [Accepted: 07/03/2016] [Indexed: 02/06/2023]
Abstract
Peripheral nerve injury affects 2.8% of trauma patients with severe cases often resulting in long-lived permanent disability, despite nerve repair surgery. Autologous Schwann cell (SC) therapy currently provides an exciting avenue for improved outcomes for these patients, particularly with the possibility to derive SCs from easily-accessible adult skin. However, due to current challenges regarding the efficient expansion of these cells, further optimization is required before they can be seriously considered for clinical application. Here, a microcarrier-based bioreactor system is proposed as a means to scale-up large numbers of adult skin-derived SCs for transplantation into the injured nerve. Bioprocessing parameters that allow for the expansion of adult rodent SCs have been identified, whilst maintaining similar rates of proliferation (as compared to static-grown SCs), expression of SC markers, and, importantly, their capacity to myelinate axons following transplant into the injured sciatic nerve. The same bioprocessing parameters can be applied to SCs derived from adult human skin, and like rodent cells, they sustain their proliferative potential and expression of SC markers. Taken together, this dataset demonstrates the basis for a scalable bioprocess for the production of SCs, an important step towards clinical use of these cells as an adjunct therapy for nerve repair. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Leila Mirfeizi
- Pharmaceutical Production Research Facility, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada.,Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Jo Anne Stratton
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Ranjan Kumar
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Prajay Shah
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada.,Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Natacha Agabalyan
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Morgan G Stykel
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada.,Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Rajiv Midha
- Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Jeff Biernaskie
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada.,Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Alberta Children's Hospital Research Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Michael S Kallos
- Pharmaceutical Production Research Facility, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada.,Biomedical Engineering Graduate Program, University of Calgary, Calgary, Alberta, Canada.,Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada
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138
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Vallières N, Barrette B, Wang LX, Bélanger E, Thiry L, Schneider MR, Filali M, Côté D, Bretzner F, Lacroix S. Betacellulin regulates schwann cell proliferation and myelin formation in the injured mouse peripheral nerve. Glia 2017; 65:657-669. [DOI: 10.1002/glia.23119] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 12/05/2016] [Accepted: 01/06/2017] [Indexed: 12/13/2022]
Affiliation(s)
- Nicolas Vallières
- Centre de recherche du Centre hospitalier universitaire (CHU) de Québec-CHUL et Département de médecine moléculaire; Faculté de médecine, Université Laval; Québec Canada
| | - Benoit Barrette
- Centre de recherche du Centre hospitalier universitaire (CHU) de Québec-CHUL et Département de médecine moléculaire; Faculté de médecine, Université Laval; Québec Canada
| | - Linda Xiang Wang
- Centre de recherche du Centre hospitalier universitaire (CHU) de Québec-CHUL et Département de médecine moléculaire; Faculté de médecine, Université Laval; Québec Canada
| | - Erik Bélanger
- Centre de recherche de l'Institut universitaire en santé mentale de Québec (CRIUSMQ) et Département de physique, génie physique et optique, Faculté des sciences et de génie, Université Laval; Québec Canada
- Centre d'optique, photonique et laser (COPL), Université Laval; Québec Canada
| | - Louise Thiry
- Centre de recherche du CHU de Québec-CHUL et Département de psychiatrie et de neurosciences de l'Université Laval; Faculté de Médecine, Université Laval; Québec Canada
| | - Marlon R. Schneider
- Institute of Molecular Animal Breeding and Biotechnology, Gene Center, LMU Munich; Munich Germany
| | - Mohammed Filali
- Centre de recherche du Centre hospitalier universitaire (CHU) de Québec-CHUL et Département de médecine moléculaire; Faculté de médecine, Université Laval; Québec Canada
| | - Daniel Côté
- Centre de recherche de l'Institut universitaire en santé mentale de Québec (CRIUSMQ) et Département de physique, génie physique et optique, Faculté des sciences et de génie, Université Laval; Québec Canada
- Centre d'optique, photonique et laser (COPL), Université Laval; Québec Canada
| | - Frédéric Bretzner
- Centre de recherche du CHU de Québec-CHUL et Département de psychiatrie et de neurosciences de l'Université Laval; Faculté de Médecine, Université Laval; Québec Canada
| | - Steve Lacroix
- Centre de recherche du Centre hospitalier universitaire (CHU) de Québec-CHUL et Département de médecine moléculaire; Faculté de médecine, Université Laval; Québec Canada
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139
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Abstract
Axonal degeneration is a pivotal feature of many neurodegenerative conditions and substantially accounts for neurological morbidity. A widely used experimental model to study the mechanisms of axonal degeneration is Wallerian degeneration (WD), which occurs after acute axonal injury. In the peripheral nervous system (PNS), WD is characterized by swift dismantling and clearance of injured axons with their myelin sheaths. This is a prerequisite for successful axonal regeneration. In the central nervous system (CNS), WD is much slower, which significantly contributes to failed axonal regeneration. Although it is well-documented that Schwann cells (SCs) have a critical role in the regenerative potential of the PNS, to date we have only scarce knowledge as to how SCs ‘sense’ axonal injury and immediately respond to it. In this regard, it remains unknown as to whether SCs play the role of a passive bystander or an active director during the execution of the highly orchestrated disintegration program of axons. Older reports, together with more recent studies, suggest that SCs mount dynamic injury responses minutes after axonal injury, long before axonal breakdown occurs. The swift SC response to axonal injury could play either a pro-degenerative role, or alternatively a supportive role, to the integrity of distressed axons that have not yet committed to degenerate. Indeed, supporting the latter concept, recent findings in a chronic PNS neurodegeneration model indicate that deactivation of a key molecule promoting SC injury responses exacerbates axonal loss. If this holds true in a broader spectrum of conditions, it may provide the grounds for the development of new glia-centric therapeutic approaches to counteract axonal loss.
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Affiliation(s)
- Keit Men Wong
- Hunter James Kelly Research Institute, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Elisabetta Babetto
- Hunter James Kelly Research Institute, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA.,Department of Pharmacology and Toxicology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Bogdan Beirowski
- Hunter James Kelly Research Institute, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA.,Department of Biochemistry, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
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140
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Mogha A, Harty BL, Carlin D, Joseph J, Sanchez NE, Suter U, Piao X, Cavalli V, Monk KR. Gpr126/Adgrg6 Has Schwann Cell Autonomous and Nonautonomous Functions in Peripheral Nerve Injury and Repair. J Neurosci 2016; 36:12351-12367. [PMID: 27927955 PMCID: PMC5148226 DOI: 10.1523/jneurosci.3854-15.2016] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2015] [Revised: 09/25/2016] [Accepted: 10/12/2016] [Indexed: 11/21/2022] Open
Abstract
Schwann cells (SCs) are essential for proper peripheral nerve development and repair, although the mechanisms regulating these processes are incompletely understood. We previously showed that the adhesion G protein-coupled receptor Gpr126/Adgrg6 is essential for SC development and myelination. Interestingly, the expression of Gpr126 is maintained in adult SCs, suggestive of a function in the mature nerve. We therefore investigated the role of Gpr126 in nerve repair by studying an inducible SC-specific Gpr126 knock-out mouse model. Here, we show that remyelination is severely delayed after nerve-crush injury. Moreover, we also observe noncell-autonomous defects in macrophage recruitment and axon regeneration in injured nerves following loss of Gpr126 in SCs. This work demonstrates that Gpr126 has critical SC-autonomous and SC-nonautonomous functions in remyelination and peripheral nerve repair. SIGNIFICANCE STATEMENT Lack of robust remyelination represents one of the major barriers to recovery of neurological functions in disease or following injury in many disorders of the nervous system. Here we show that the adhesion class G protein-coupled receptor (GPCR) Gpr126/Adgrg6 is required for remyelination, macrophage recruitment, and axon regeneration following nerve injury. At least 30% of all approved drugs target GPCRs; thus, Gpr126 represents an attractive potential target to stimulate repair in myelin disease or following nerve injury.
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Affiliation(s)
| | | | | | | | | | - Ueli Suter
- Institute of Molecular Health Sciences, Department of Biology, Swiss Federal Institute of Technology, Zurich, ETH Zurich, CH-8093 Zurich, Switzerland, and
| | - Xianhua Piao
- Division of Newborn Medicine, Department of Medicine, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115
| | - Valeria Cavalli
- Department of Neuroscience, and
- Hope Center for Neurological Disorders, Washington University School of Medicine, St. Louis, Missouri 63110
| | - Kelly R Monk
- Department of Developmental Biology,
- Hope Center for Neurological Disorders, Washington University School of Medicine, St. Louis, Missouri 63110
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Sánchez M, Anitua E, Delgado D, Sanchez P, Prado R, Orive G, Padilla S. Platelet-rich plasma, a source of autologous growth factors and biomimetic scaffold for peripheral nerve regeneration. Expert Opin Biol Ther 2016; 17:197-212. [DOI: 10.1080/14712598.2017.1259409] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Mikel Sánchez
- Arthroscopic Surgery Unit, Hospital Vithas San José, Vitoria-Gasteiz, Spain
| | - Eduardo Anitua
- BTI Biotechnology Institute, Vitoria, Spain
- Eduardo Anitua Foundation, Vitoria, Spain
| | - Diego Delgado
- Arthroscopic Surgery Unit Research, Hospital Vithas San José, Vitoria-Gasteiz, Spain
| | - Peio Sanchez
- Arthroscopic Surgery Unit Research, Hospital Vithas San José, Vitoria-Gasteiz, Spain
| | | | - Gorka Orive
- BTI Biotechnology Institute, Vitoria, Spain
- Eduardo Anitua Foundation, Vitoria, Spain
- Lab of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of The Basque Country (UPV/EHU), Vitoria-Gasteiz, Spain
- Centro de Investigación Biomédica en Red, Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Sabino Padilla
- BTI Biotechnology Institute, Vitoria, Spain
- Eduardo Anitua Foundation, Vitoria, Spain
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142
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Song J, Sun B, Liu S, Chen W, Zhang Y, Wang C, Mo X, Che J, Ouyang Y, Yuan W, Fan C. Polymerizing Pyrrole Coated Poly (l-lactic acid-co-ε-caprolactone) (PLCL) Conductive Nanofibrous Conduit Combined with Electric Stimulation for Long-Range Peripheral Nerve Regeneration. Front Mol Neurosci 2016; 9:117. [PMID: 27877111 PMCID: PMC5100554 DOI: 10.3389/fnmol.2016.00117] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Accepted: 10/21/2016] [Indexed: 12/02/2022] Open
Abstract
Electrospinning and electric stimulation (ES) are both promising methods to support neuron adhesion and guide extension of neurons for nerve regeneration. Concurrently, all studies focus on either electrospinning for conduits material or ES in vitro study to accelerate nerve regeneration; few work on the combined use of these two strategies or ES in vivo study. Therefore, this study aimed to investigate the abilities of direct current ES through electrospinning conductive polymer composites composed of polypyrrole and Poly (l-lactic acid-co-ε-caprolactone) (PPY/PLCL) in peripheral nerve regeneration. PPY/PLCL composite conduits were synthesized by polymerizing pyrrole coated electrospun PLCL scaffolds. Morphologies and chemical compositions were characterized by scanning electron microscope and attenuated total reflection fourier transform infrared (ATR-FTIR) microscope. Rat pheochromocytoma 12 (PC12) cells and dorsal root ganglia (DRG) cells cultured on PPY/PLCL scaffolds were stimulated with 100 mV/cm for 4 h per day. The median neurite length and cell viability were measured in PC-12 cells. The levels of brain-derived neurotrophic factor (BDNF), glial cell derived neurotrophic factor (GDNF) and neurotrophin-3 (NT-3) were analyzed in DRG cells. In rats, 15 mm gaps of sciatic nerves were bridged using an autograft, non-stimulated PPY/PLCL conduit and PPY/PLCL conduit stimulated with 100 mV potential, respectively. A 100 mV potential direct current ES was applied for 1 h per day at 1, 3, 5 and 7 days post-implantation. The PPY/PLCL conduits with ES showed a similar performance compared with the autograft group, and significantly better than the non-stimulated PPY/PLCL conduit group. These promising results show that the PPY/PLCL conductive conduits’ combined use with ES has great potential for peripheral nerve regeneration.
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Affiliation(s)
- Jialin Song
- Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai, China; Shanghai Sixth People's Hospital East Campus, Shanghai University of Medicine and HealthShanghai, China
| | - Binbin Sun
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University Shanghai, China
| | - Shen Liu
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital Shanghai, China
| | - Wei Chen
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital Shanghai, China
| | - Yuanzheng Zhang
- Changhai Hospital of Second Military Medical University Shanghai, China
| | - Chunyang Wang
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital Shanghai, China
| | - Xiumei Mo
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University Shanghai, China
| | - Junyi Che
- School of Pharmacy, Shanghai Jiao Tong University Shanghai, China
| | - Yuanming Ouyang
- Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai, China; Shanghai Sixth People's Hospital East Campus, Shanghai University of Medicine and HealthShanghai, China
| | - Weien Yuan
- School of Pharmacy, Shanghai Jiao Tong University Shanghai, China
| | - Cunyi Fan
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital Shanghai, China
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143
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Nardo G, Trolese MC, de Vito G, Cecchi R, Riva N, Dina G, Heath PR, Quattrini A, Shaw PJ, Piazza V, Bendotti C. Immune response in peripheral axons delays disease progression in SOD1 G93A mice. J Neuroinflammation 2016; 13:261. [PMID: 27717377 PMCID: PMC5055725 DOI: 10.1186/s12974-016-0732-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 09/23/2016] [Indexed: 11/16/2022] Open
Abstract
Background Increasing evidence suggests that the immune system has a beneficial role in the progression of amyotrophic lateral sclerosis (ALS) although the mechanism remains unclear. Recently, we demonstrated that motor neurons (MNs) of C57SOD1G93A mice with slow disease progression activate molecules classically involved in the cross-talk with the immune system. This happens a lot less in 129SvSOD1G93A mice which, while expressing the same amount of transgene, had faster disease progression and earlier axonal damage. The present study investigated whether and how the immune response is involved in the preservation of motor axons in the mouse model of familial ALS with a more benign disease course. Methods First, the extent of axonal damage, Schwann cell proliferation, and neuromuscular junction (NMJ) denervation were compared between the two ALS mouse models at the disease onset. Then, we compared the expression levels of different immune molecules, the morphology of myelin sheaths, and the presence of blood-derived immune cell infiltrates in the sciatic nerve of the two SOD1G93A mouse strains using immunohistochemical, immunoblot, quantitative reverse transcription PCR, and rotating-polarization Coherent Anti-Stokes Raman Scattering techniques. Results Muscle denervation, axonal dysregulation, and myelin disruption together with reduced Schwann cell proliferation are prominent in 129SvSOD1G93A compared to C57SOD1G93A mice at the disease onset, and this correlates with a faster disease progression in the first strain. On the contrary, a striking increase of immune molecules such as CCL2, MHCI, and C3 was seen in sciatic nerves of slow progressor C57SOD1G93A mice and this was accompanied by heavy infiltration of CD8+ T lymphocytes and macrophages. These phenomena were not detectable in the peripheral nervous system of fast-progressing mice. Conclusions These data show for the first time that damaged MNs in SOD1-related ALS actively recruit immune cells in the peripheral nervous system to delay muscle denervation and prolong the lifespan. On the contrary, the lack of this response has a negative impact on the disease course. Electronic supplementary material The online version of this article (doi:10.1186/s12974-016-0732-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Giovanni Nardo
- Laboratory of Molecular Neurobiology, Department of Neuroscience, IRCCS - Istituto di Ricerche Farmacologiche Mario Negri, Via La Masa 19, 20156, Milan, Italy.
| | - Maria Chiara Trolese
- Laboratory of Molecular Neurobiology, Department of Neuroscience, IRCCS - Istituto di Ricerche Farmacologiche Mario Negri, Via La Masa 19, 20156, Milan, Italy
| | - Giuseppe de Vito
- NEST, Scuola Normale Superiore, Piazza San Silvestro 12, I-56127, Pisa, Italy.,Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia, Piazza San Silvestro 12, I-56127, Pisa, Italy
| | - Roberta Cecchi
- NEST, Scuola Normale Superiore, Piazza San Silvestro 12, I-56127, Pisa, Italy
| | - Nilo Riva
- Neuropathology Unit, Department of Neurology, INSPE, San Raffaele Scientific Institute, Dibit II, Via Olgettina 48, 20132, Milan, Italy
| | - Giorgia Dina
- Neuropathology Unit, Department of Neurology, INSPE, San Raffaele Scientific Institute, Dibit II, Via Olgettina 48, 20132, Milan, Italy
| | - Paul R Heath
- Department of Neuroscience, Academic Neurology Unit, Faculty of Medicine, Dentistry and Health, Sheffield Institute for Translational Neuroscience, University of Sheffield, 385 Glossop Road, Sheffield, S10 2HQ, UK
| | - Angelo Quattrini
- Neuropathology Unit, Department of Neurology, INSPE, San Raffaele Scientific Institute, Dibit II, Via Olgettina 48, 20132, Milan, Italy
| | - Pamela J Shaw
- Department of Neuroscience, Academic Neurology Unit, Faculty of Medicine, Dentistry and Health, Sheffield Institute for Translational Neuroscience, University of Sheffield, 385 Glossop Road, Sheffield, S10 2HQ, UK
| | - Vincenzo Piazza
- Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia, Piazza San Silvestro 12, I-56127, Pisa, Italy
| | - Caterina Bendotti
- Laboratory of Molecular Neurobiology, Department of Neuroscience, IRCCS - Istituto di Ricerche Farmacologiche Mario Negri, Via La Masa 19, 20156, Milan, Italy.
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144
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McLean NA, Verge VMK. Dynamic impact of brief electrical nerve stimulation on the neural immune axis-polarization of macrophages toward a pro-repair phenotype in demyelinated peripheral nerve. Glia 2016; 64:1546-61. [PMID: 27353566 DOI: 10.1002/glia.23021] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 06/06/2016] [Accepted: 06/07/2016] [Indexed: 12/13/2022]
Abstract
Demyelinating peripheral nerves are infiltrated by cells of the monocyte lineage, including macrophages, which are highly plastic, existing on a continuum from pro-inflammatory M1 to pro-repair M2 phenotypic states. Whether one can therapeutically manipulate demyelinated peripheral nerves to promote a pro-repair M2 phenotype remains to be elucidated. We previously identified brief electrical nerve stimulation (ES) as therapeutically beneficial for remyelination, benefits which include accelerated clearance of macrophages, making us theorize that ES alters the local immune response. Thus, the impact of ES on the immune microenvironment in the zone of demyelination was examined. Adult male rat tibial nerves were focally demyelinated via 1% lysophosphatidyl choline (LPC) injection. Five days later, half underwent 1 hour 20 Hz sciatic nerve ES proximal to the LPC injection site. ES had a remarkable and significant impact, shifting the macrophage phenotype from predominantly pro-inflammatory/M1 toward a predominantly pro-repair/M2 one, as evidenced by an increased incidence of expression of M2-associated phenotypic markers in identified macrophages and a decrease in M1-associated marker expression. This was discernible at 3 days post-ES (8 days post-LPC) and continued at the 5 day post-ES (10 days post-LPC) time point examined. ES also affected chemokine (C-C motif) ligand 2 (CCL2; aka MCP-1) expression in a manner that correlated with increases and decreases in macrophage numbers observed in the demyelination zone. The data establish that briefly increasing neuronal activity favorably alters the immune microenvironment in demyelinated nerve, rapidly polarizing macrophages toward a pro-repair phenotype, a beneficial therapeutic concept that may extend to other pathologies. GLIA 2016;64:1546-1561.
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Affiliation(s)
- Nikki A McLean
- Department of Anatomy and Cell Biology, CMSNRC (Cameco MS Neuroscience Research Center), University of Saskatchewan, Saskatoon, SK, Canada
| | - Valerie M K Verge
- Department of Anatomy and Cell Biology, CMSNRC (Cameco MS Neuroscience Research Center), University of Saskatchewan, Saskatoon, SK, Canada
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145
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Nardo G, Trolese MC, Bendotti C. Major Histocompatibility Complex I Expression by Motor Neurons and Its Implication in Amyotrophic Lateral Sclerosis. Front Neurol 2016; 7:89. [PMID: 27379008 PMCID: PMC4904147 DOI: 10.3389/fneur.2016.00089] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 05/30/2016] [Indexed: 12/13/2022] Open
Abstract
Neuronal expression of major histocompatibility complex I (MHCI)-related molecules in adults and during CNS diseases is involved in the synaptic plasticity and axonal regeneration with mechanisms either dependent or independent of their immune functions. Motor neurons are highly responsive in triggering the expression of MHCI molecules during normal aging or following insults and diseases, and this has implications in the synaptic controls, axonal regeneration, and neuromuscular junction stability of these neurons. We recently reported that MHCI and immunoproteasome are strongly activated in spinal motor neurons and their peripheral motor axon in a mouse model of familial amyotrophic lateral sclerosis (ALS) during the course of the disease. This response was prominent in ALS mice with slower disease progression in which the axonal structure and function was better preserved than in fast-progressing mice. This review summarizes and discusses our observations in the light of knowledge about the possible role of MHCI in motor neurons providing additional insight into the pathophysiology of ALS.
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Affiliation(s)
- Giovanni Nardo
- Laboratory of Molecular Neurobiology, Department of Neuroscience, Mario Negri Institute for Pharmacological Research IRCCS , Milan , Italy
| | - Maria Chiara Trolese
- Laboratory of Molecular Neurobiology, Department of Neuroscience, Mario Negri Institute for Pharmacological Research IRCCS , Milan , Italy
| | - Caterina Bendotti
- Laboratory of Molecular Neurobiology, Department of Neuroscience, Mario Negri Institute for Pharmacological Research IRCCS , Milan , Italy
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146
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Adipose-Derived Stem Cells Promote Peripheral Nerve Regeneration In Vivo without Differentiation into Schwann-Like Lineage. Plast Reconstr Surg 2016; 137:318e-330e. [PMID: 26818322 DOI: 10.1097/01.prs.0000475762.86580.36] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND During recent decades, multipotent stem cells were found to reside in the adipose tissue, and these adipose-derived stem cells were shown to play beneficial roles, like those of Schwann cells, in peripheral nerve regeneration. However, it has not been well established whether adipose-derived stem cells offer beneficial effects to peripheral nerve injuries in vivo as Schwann cells do. Furthermore, the in situ survival and differentiation of adipose-derived stem cells after transplantation at the injured peripheral nerve tissue remain to be fully elucidated. METHODS Adipose-derived stem cells and Schwann cells were transplanted with gelatin hydrogel tubes at the artificially blunted sciatic nerve lesion in mice. Neuroregenerative abilities of them were comparably estimated. Cre-loxP-mediated fate tracking was performed to visualize survival in vivo of transplanted adipose-derived stem cells and to investigate whether they differentiated into Schwann linage cells at the peripheral nerve injury site. RESULTS The transplantation of adipose-derived stem cells promoted regeneration of axons, formation of myelin, and restoration of denervation muscle atrophy to levels comparable to those achieved by Schwann cell transplantation. The adipose-derived stem cells survived for at least 4 weeks after transplantation without differentiating into Schwann cells. CONCLUSIONS Transplanted adipose-derived stem cells did not differentiate into Schwann cells but promoted peripheral nerve regeneration at the injured site. The neuroregenerative ability was comparable to that of Schwann cells. Adipose-derived stem cells at an undifferentiated stage may be used as an alternative cell source for autologous cell therapy for patients with peripheral nerve injury.
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147
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Freria CM, Bernardes D, Almeida GL, Simões GF, Barbosa GO, Oliveira ALR. Impairment of toll-like receptors 2 and 4 leads to compensatory mechanisms after sciatic nerve axotomy. J Neuroinflammation 2016; 13:118. [PMID: 27222120 PMCID: PMC4879730 DOI: 10.1186/s12974-016-0579-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 05/11/2016] [Indexed: 12/12/2022] Open
Abstract
Background Peripheral nerve injury results in retrograde cell body-related changes in the spinal motoneurons that will contribute to the regenerative response of their axons. Successful functional recovery also depends on molecular events mediated by innate immune response during Wallerian degeneration in the nerve microenvironment. A previous study in our lab demonstrated that TLR 2 and 4 develop opposite effects on synaptic stability in the spinal cord after peripheral nerve injury. Therefore, we suggested that the better preservation of spinal cord microenvironment would positively influence distal axonal regrowth. In this context, the present work aimed to investigate the influence of TLR2 and TLR4 on regeneration and functional recovery after peripheral nerve injury. Methods Eighty-eight mice were anesthetized and subjected to unilateral sciatic nerve crush (C3H/HeJ, n = 22, C3H/HePas, n = 22; C57Bl6/J, n = 22 and TLR2−/−, n = 22). After the appropriate survival times (3, 7, 14 days, and 5 weeks), all mice were killed and the sciatic nerves and tibialis cranialis muscles were processed for immunohistochemistry and transmission electron microscopy (TEM). Gait analysis, after sciatic nerve crushing, was performed in another set of mice (minimum of n = 8 per group), by using the walking track test (CatWalk system). Results TLR4 mutant mice presented greater functional recovery as well as an enhanced p75NTR and neurofilament protein expression as compared to the wild-type strain. Moreover, the better functional recovery in mutant mice was correlated to a greater number of nerve terminal sprouts. Knockout mice for TLR2 exhibited 30 % greater number of degenerated axons in the distal stump of the sciatic nerve and a decreased p75NTR and neurofilament protein expression compared to the wild type. However, the absence of TLR2 receptor did not influence the overall functional recovery. End-point equivalent functional recovery in transgenic mice may be a result of enhanced axonal diameter found at 2 weeks after lesion. Conclusions Altogether, the present results indicate that the lack of TLR2 or the absence of functional TLR4 does affect the nerve regeneration process; however, such changes are minimized through different compensatory mechanisms, resulting in similar motor function recovery, as compared to wild-type mice. These findings contribute to the concept that innate immune-related molecules influence peripheral nerve regeneration by concurrently participating in processes taking place both at the CNS and PNS. Electronic supplementary material The online version of this article (doi:10.1186/s12974-016-0579-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- C M Freria
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas, Campinas, Sao Paulo, Brazil
| | - D Bernardes
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas, Campinas, Sao Paulo, Brazil
| | - G L Almeida
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas, Campinas, Sao Paulo, Brazil
| | - G F Simões
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas, Campinas, Sao Paulo, Brazil
| | - G O Barbosa
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas, Campinas, Sao Paulo, Brazil
| | - A L R Oliveira
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas, Campinas, Sao Paulo, Brazil.
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148
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CSF1R blockade slows the progression of amyotrophic lateral sclerosis by reducing microgliosis and invasion of macrophages into peripheral nerves. Sci Rep 2016; 6:25663. [PMID: 27174644 PMCID: PMC4865981 DOI: 10.1038/srep25663] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 04/20/2016] [Indexed: 11/13/2022] Open
Abstract
Inflammation is a common neuropathological feature in several neurological disorders, including amyotrophic lateral sclerosis (ALS). We have studied the contribution of CSF1R signalling to inflammation in ALS, as a pathway previously reported to control the expansion and activation of microglial cells. We found that microglial cell proliferation in the spinal cord of SOD1G93A transgenic mice correlates with the expression of CSF1R and its ligand CSF1. Administration of GW2580, a selective CSF1R inhibitor, reduced microglial cell proliferation in SOD1G93A mice, indicating the importance of CSF1-CSF1R signalling in microgliosis in ALS. Moreover, GW2580 treatment slowed disease progression, attenuated motoneuron cell death and extended survival of SOD1G93A mice. Electrophysiological assessment revealed that GW2580 treatment protected skeletal muscle from denervation prior to its effects on microglial cells. We found that macrophages invaded the peripheral nerve of ALS mice before CSF1R-induced microgliosis occurred. Interestingly, treatment with GW2580 attenuated the influx of macrophages into the nerve, which was partly caused by the monocytopenia induced by CSF1R inhibition. Overall, our findings provide evidence that CSF1R signalling regulates inflammation in the central and peripheral nervous system in ALS, supporting therapeutic targeting of CSF1R in this disease.
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149
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Role of IL-10 in Resolution of Inflammation and Functional Recovery after Peripheral Nerve Injury. J Neurosci 2016; 35:16431-42. [PMID: 26674868 DOI: 10.1523/jneurosci.2119-15.2015] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
UNLABELLED A rapid proinflammatory response after peripheral nerve injury is required for clearance of tissue debris (Wallerian degeneration) and effective regeneration. Unlike the CNS, this response is rapidly terminated in peripheral nerves starting between 2 and 3 weeks after crush injury. We examined the expression and role of the anti-inflammatory cytokine IL-10 in the resolution of inflammation and regeneration after sciatic nerve crush injury in mice. IL-10 mRNA increased over the first 7 d after injury, whereas at the protein level, immunofluorescence labeling showed IL-10(+) cells increased almost 3-fold in the first 3 weeks, with macrophages being the major cell type expressing IL-10. The role of IL-10 in nerve injury was assessed using IL-10-null mice. Increased numbers of macrophages were found in the distal segment of IL-10-null mice at early (3 d) and late (14 and 21 d) time points, suggesting that IL-10 may play a role in controlling the early influx and the later efflux of macrophages out of the nerve. A chemokine/cytokine PCR array of the nerve 24 h after crush showed a 2- to 4-fold increase in the expression of 10 proinflammatory mediators in IL-10(-/-) mice. In addition, myelin phagocytosis in vitro by LPS stimulated bone-marrow-derived macrophages from IL-10-null mice failed to downregulate expression of proinflammatory chemokines/cytokines, suggesting that IL-10 is required for the myelin-phagocytosis-induced shift of macrophages from proinflammatory to anti-inflammatory/pro-repair phenotype. The failure to switch off inflammation in IL-10-null mice was accompanied by impaired axon regeneration and poor recovery of motor and sensory function. SIGNIFICANCE STATEMENT An appropriately regulated inflammatory response after peripheral nerve injury is essential for axon regeneration and recovery. The aim of this study was to investigate the expression and role of the anti-inflammatory cytokine IL-10 in terminating inflammation after sciatic nerve crush injury and promoting regeneration. IL-10 is rapidly expressed by macrophages after crush injury. Its role was assessed using IL-10-null mice, which showed that IL-10 plays a role in controlling the early influx and the later efflux of macrophages out of the injured nerve, reduces the expression of proinflammatory chemokines and cytokines, and is required for myelin-phagocytosis-induced shift of macrophages from proinflammatory to anti-inflammatory. Furthermore, lack of IL-10 leads to impaired axon regeneration and poor recovery of motor and sensory function.
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150
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Liu L, Fissel JA, Tasnim A, Borzan J, Gocke A, Calabresi PA, Farah MH. Increased TNFR1 expression and signaling in injured peripheral nerves of mice with reduced BACE1 activity. Neurobiol Dis 2016; 93:21-7. [PMID: 27080468 DOI: 10.1016/j.nbd.2016.04.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 03/01/2016] [Accepted: 04/06/2016] [Indexed: 11/19/2022] Open
Abstract
Hematogenous macrophages remove myelin debris from injured peripheral nerves to provide a micro-environment conducive to axonal regeneration. Previously, we observed that injured peripheral nerves from Beta-site APP Cleaving Enzyme 1 (BACE1) knockout (KO) mice displayed earlier influx of and enhanced phagocytosis by macrophages when compared to wild-type (WT) mice. These observations suggest that BACE1 might regulate macrophage influx into distal stumps of injured nerves. To determine through which pathway BACE1 influences macrophage influx, we used a mouse inflammation antibody array to assay the expression of inflammation-related proteins in injured nerves of BACE1 KO and WT mice. The most significant change was in expression of tumor necrosis factor receptor 1 (TNFR1) in the distal stump of injured BACE1 KO nerves. Western blotting of protein extracts confirmed increased expression of TNFR1 and its downstream transcriptional factor NFκB in the BACE1 KO distal stumps. Additionally, treatment of WT mice with a BACE1 inhibitor resulted in increased TNFR1 expression and signaling in the distal stump of injured nerves. Exogenous TNFα increased nuclear translocation of p65 NFκB in BACE1 KO tissue and cultured fibroblasts compared with control WT. BACE1 regulates TNFR1 expression at the level of gene expression and not through proteolytic processing. The accelerated macrophage influx in injured nerves of BACE1 KO mice correlates with increased expression and signaling via TNFR1, indicating a link between BACE1 activity and TNFR1 expression/signaling that might contribute to repair of the injured nervous system.
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Affiliation(s)
- Lijuan Liu
- Department of Neurology, Johns Hopkins University School of Medicine, United States
| | - John A Fissel
- Department of Neurology, Johns Hopkins University School of Medicine, United States
| | - Aniqa Tasnim
- Department of Neurology, Johns Hopkins University School of Medicine, United States
| | - Jasenka Borzan
- Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University School of Medicine, United States
| | - Anne Gocke
- Department of Neurology, Johns Hopkins University School of Medicine, United States
| | - Peter A Calabresi
- Department of Neurology, Johns Hopkins University School of Medicine, United States
| | - Mohamed H Farah
- Department of Neurology, Johns Hopkins University School of Medicine, United States.
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