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| Open AccessMeningeal lymphatic dysfunction exacerbates traumatic brain injury pathogenesis
Traumatic brain injury (TBI) is a serious and poorly understood medical condition. Here, the authors show that TBI induces long-lasting deficits in brain lymphatic drainage. They report that defects in this drainage pathway provoke severe TBI pathogenesis that can be rescued with VEGF-C treatment.
- Ashley C. Bolte
- , Arun B. Dutta
- & John R. Lukens
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Article
| Open AccessMicroenvironment-responsive immunoregulatory electrospun fibers for promoting nerve function recovery
Inflammatory responses determine the pathological course of spinal cord injury. Here, the authors report on pH responsive fibers for triggered release of IL-4 plasmid liposomes and sustained release of nerve growth factor to regulate the immune response and promote nerve regeneration to enhance functional recovery.
- Kun Xi
- , Yong Gu
- & Liang Chen
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Article
| Open AccessVEGFR2 signaling drives meningeal vascular regeneration upon head injury
Severe head injury results in critical damage of blood vessels of the meninges and brain parenchyma. Here, the authors describe key pathways governing meningeal vascular regeneration following head injury, characterizing the differential roles of VEGFR2, Tie2, Dll4 and PDGFRβ signaling.
- Bong Ihn Koh
- , Hyuek Jong Lee
- & Injune Kim
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Article
| Open AccessSpinal cord injury causes chronic bone marrow failure
Spinal cord injury (SCI) often leads to immune dysfunction, but mechanistic insights are still lacking. Here the authors show that SCI alters chemokine signaling and induces long, persisting defects in hematopoietic stem and progenitor cell migration, thereby entrapping them in the bone marrow and disrupting peripheral immune homeostasis.
- Randall S. Carpenter
- , Jessica M. Marbourg
- & Phillip G. Popovich
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Article
| Open AccessLipid metabolism adaptations are reduced in human compared to murine Schwann cells following injury
The regeneration dynamics following peripheral nerve injury differs among species. Here, the authors compared transcriptomic and lipid metabolism changes in murine and human Schwann cells in vivo and ex vivo sural nerves, underlying their switch from myelinating to repair state following injury.
- Sofia Meyer zu Reckendorf
- , Christine Brand
- & Bernd Knöll
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Article
| Open AccessEnhancing plasticity in central networks improves motor and sensory recovery after nerve damage
Peripheral nerve damage generates maladaptive neuroplasticity as central networks attempt to compensate for the loss of peripheral connectivity. Here, the authors reverse the aberrant plasticity via vagus nerve stimulation to elicit synaptic reorganization and to improve sensorimotor recovery.
- Eric C. Meyers
- , Nimit Kasliwal
- & Seth A. Hays
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Review Article
| Open AccessMoving beyond the glial scar for spinal cord repair
The scar formation that occurs following spinal cord injury has properties that are distinct to scars seen in other areas of the CNS, and in other tissues. Here the authors discuss the components of the spinal cord injury scar and how it can have both detrimental and positive roles in relation to recovery.
- Elizabeth J. Bradbury
- & Emily R. Burnside
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Article
| Open AccessRapid and robust restoration of breathing long after spinal cord injury
Respiratory failure is one of the leading causes of death following spinal cord injury and it is unclear if normal respiratory motor activity can be recovered after chronic injury-induced paralysis. Here, authors show that treatment with chondroitinase ABC induces robust rescue of breathing up to 1.5 years following complete hemidiaphragm paralysis.
- Philippa M. Warren
- , Stephanie C. Steiger
- & Jerry Silver
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Article
| Open AccessEngulfing cells promote neuronal regeneration and remove neuronal debris through distinct biochemical functions of CED-1
It is unclear how removal of axon debris and initiation of axon regeneration following nerve injury is co-regulated. In this study, the authors show that the extracellular domain (ECD) of the engulfment receptor, CED-1, functions as an adhesion molecule to promote axonal regeneration after injury, independent of its function in phagocytosis
- Hui Chiu
- , Yan Zou
- & Chieh Chang
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Article
| Open AccessDynamic control of proinflammatory cytokines Il-1β and Tnf-α by macrophages in zebrafish spinal cord regeneration
While proinflammatory signalling is preventive to axon regrowth, activated macrophages can be beneficial, for example by limiting the inflammation. This study uses mutant zebrafish lines that lack macrophages and/or microglia to show that peripheral macrophages are necessary in axon regrowth following complete transection of spinal cord.
- Themistoklis M. Tsarouchas
- , Daniel Wehner
- & Catherina G. Becker
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Article
| Open AccessModulation of proteoglycan receptor PTPσ enhances MMP-2 activity to promote recovery from multiple sclerosis
Demyelination failure in multiple sclerosis (MS) may contribute to the disease progression. This study shows that chondroitin sulfate proteoglycans (CSPGs) can inhibit remyelination in an animal model of MS via CSPG binding with the receptor PTPσ on oligodendrocyte progenitor cells, and disruption of this interaction can promote recovery in the animal models of MS.
- Fucheng Luo
- , Amanda Phuong Tran
- & Yan Yang
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Article
| Open AccessHuman neuroepithelial stem cell regional specificity enables spinal cord repair through a relay circuit
The optimal type or regional origin of stem cells for regenerative applications in the nervous system has not yet been established. Here the authors show that human neuroepithelial stem cells from the developing spinal cord, but not those from the developing cortex, show good host-graft interaction when transplanted to rodent models of spinal cord injury.
- Maria Teresa Dell’Anno
- , Xingxing Wang
- & Stephen M. Strittmatter
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Article
| Open AccessAxonal G3BP1 stress granule protein limits axonal mRNA translation and nerve regeneration
G3BP1 is RasGAP SH3 domain binding protein 1 that interacts with 48S pre-initiation complex when translation is stalled. Here, Twiss and colleagues show that neuronal G3BP1 can negatively regulate axonal mRNA translation, and inhibit axonal regeneration after injury.
- Pabitra K. Sahoo
- , Seung Joon Lee
- & Jeffery L. Twiss
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Article
| Open AccessPhosphatidylserine exposure mediated by ABC transporter activates the integrin signaling pathway promoting axon regeneration
Apoptotic cells display surface signals such as phosphatidlyserines that are recognized by phagocytes via engulfment signal receptors. Here, the authors show how one such receptor, transthyretin-like protein 11, plays a role in initiating axon regeneration in the peripheral nervous system.
- Naoki Hisamoto
- , Anna Tsuge
- & Kunihiro Matsumoto
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Article
| Open AccessLocomotor recovery following contusive spinal cord injury does not require oligodendrocyte remyelination
The contribution of oligodendrocytes to remyelination in functional recovery after spinal cord injury is not fully understood. Here, the authors show that oligodendrocyte progenitor cell differentiation is not required for functional recovery after spinal cord injury in mice.
- Greg J. Duncan
- , Sohrab B. Manesh
- & Wolfram Tetzlaff
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Article
| Open AccessThe synaptic receptor Lrp4 promotes peripheral nerve regeneration
Axons of the peripheral nervous system regenerate along Schwann cells following injury. Here, the authors show that regenerating axons follow pioneer axons and this process is mediated by lipoprotein receptor-related protein 4 (Lrp4), a protein otherwise known for its role in synapse formation.
- Katherine D. Gribble
- , Lauren J. Walker
- & Michael Granato
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Article
| Open AccessDistinct homeostatic modulations stabilize reduced postsynaptic receptivity in response to presynaptic DLK signaling
Dual leucine zipper kinase (DLK) activates an intrinsic neuronal response to injury and is also implicated in neurodegeneration. Here, Goel and Dickman characterize how postsynaptic targets adapt to presynaptic DLK signaling through a downregulation of synaptic strength.
- Pragya Goel
- & Dion Dickman
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Article
| Open AccessHCN2 Rescues brain defects by enforcing endogenous voltage pre-patterns
The authors have previously shown that membrane voltage can influence embryonic patterning during development. Here, the authors computationally model how nicotine disrupts Xenopus embryogenesis by perturbing voltage gradients, and rescue nicotine-inducted defects with HCN2 channel expression.
- Vaibhav P. Pai
- , Alexis Pietak
- & Michael Levin
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Article
| Open AccessAn integrated multi-layer 3D-fabrication of PDA/RGD coated graphene loaded PCL nanoscaffold for peripheral nerve restoration
Graphene, as a conductive nanomaterial, has potential applications in the restoration of nerve function following physical injury. Here the authors design a graphene scaffold that can improve nerve regeneration.
- Yun Qian
- , Xiaotian Zhao
- & Weien Yuan
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Article
| Open AccessInjured adult motor and sensory axons regenerate into appropriate organotypic domains of neural progenitor grafts
Understanding how transplanted cells interact with the host nervous system will be important for cell based neural regeneration approaches. Here, the authors study the sensory fate of neural progenitor cell grafts transplanted to the injured spinal cord, and show that host axons retain the ability to distinguish appropriate and inappropriate graft targets.
- Jennifer N. Dulin
- , Andrew F. Adler
- & Mark H. Tuszynski
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Article
| Open AccessOptogenetically stimulating intact rat corticospinal tract post-stroke restores motor control through regionalized functional circuit formation
Existing methods to improve motor function after stroke include non-specific neuromodulatory approaches. Here the authors use an automated method of analysis of reaching behaviour in rodents to show that optogenetic stimulation of intact corticospinal tract fibres leads to restoration of prior motor functions, rather than compensatory acquisition of new movements.
- A. S. Wahl
- , U. Büchler
- & M. E. Schwab
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Article
| Open AccessDistal axotomy enhances retrograde presynaptic excitability onto injured pyramidal neurons via trans-synaptic signaling
Spinal cord injury can induce synaptic reorganization and remodeling in the brain. Here the authors study how severed distal axons signal back to the cell body to induce hyperexcitability, loss of inhibition and enhanced presynaptic release through netrin-1.
- Tharkika Nagendran
- , Rylan S. Larsen
- & Anne Marion Taylor
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Article
| Open AccessAn injectable hydrogel enhances tissue repair after spinal cord injury by promoting extracellular matrix remodeling
The cystic cavity that develops following injuries to brain or spinal cord is a major obstacle. Here the authors show an injection of imidazole poly(organophosphazenes), a hydrogel with thermosensitive sol–gel transition behavior, almost completely eliminates cystic cavities in a clinically relevant rat spinal cord injury model.
- Le Thi Anh Hong
- , Young-Min Kim
- & Byung Gon Kim
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Article
| Open AccessMHC matching improves engraftment of iPSC-derived neurons in non-human primates
Major histocompatibility complex (MHC) matching improves graft survival rates after organ transplantation. Here the authors show that in macaques, MHC-matched iPSC-derived neurons provide better engraftment in the brain, with a lower immune response and higher survival of the transplanted neurons.
- Asuka Morizane
- , Tetsuhiro Kikuchi
- & Jun Takahashi
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Article
| Open AccessOptogenetic rewiring of thalamocortical circuits to restore function in the stroke injured brain
Stroke recovery requires circuit reorganization and therapeutic efforts have focused on rewiring cortical circuits after stroke, but what about thalamic inputs? Here, the authors examine how thalamocortical axons are affected by stroke and use optogenetic stimulation to promote recovery.
- Kelly A. Tennant
- , Stephanie L. Taylor
- & Craig E. Brown
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Article
| Open AccessDelaying histone deacetylase response to injury accelerates conversion into repair Schwann cells and nerve regeneration
Brüggeret al. identify part of the molecular machinery that controls Schwann cell development after peripheral nerve injury. Inhibiting HDAC1/2 early after injury enhances nerve regeneration and promotes functional recovery.
- Valérie Brügger
- , Mert Duman
- & Claire Jacob
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Article
| Open AccessTransplanted photoreceptor precursors transfer proteins to host photoreceptors by a mechanism of cytoplasmic fusion
Previous studies have used fluorescently labelled cells to demonstrate the incorporation of transplanted photoreceptor precursors into the mouse retina. Here, the authors show that fluorescent proteins are passed between the host and transplanted cells rather than migration of donor cells into the retina.
- Mandeep S. Singh
- , Jasmin Balmer
- & Robert E. MacLaren
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Article
| Open AccessSpatiotemporal dynamics of lesion-induced axonal sprouting and its relation to functional architecture of the cerebellum
Neurodegenerative lesions induce sprouting from surviving axons, but the patterns of re-innervation of these collaterals in relation to existing functional networks remains unclear. Here the authors performed long term in vivoimaging in mice, of sprouts from cerebellar climbing fibers after a lesion, and describe the patterns of connectivity relative to functionally active zones.
- Matasha Dhar
- , Joshua M. Brenner
- & Hiroshi Nishiyama
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Article
| Open AccessPresynaptic partner selection during retinal circuit reassembly varies with timing of neuronal regeneration in vivo
Neurons in the zebrafish retina regenerate. Here, Yoshimatsu and colleagues show that retinal horizontal cells maintain their synaptic preferences for a limited period before circuit remodeling is triggered after photoreceptor loss.
- Takeshi Yoshimatsu
- , Florence D. D’Orazi
- & Rachel O. Wong
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Article
| Open AccessTopological data analysis for discovery in preclinical spinal cord injury and traumatic brain injury
Data-driven discovery in complex neurological disorders has potential to extract meaningful knowledge from large, heterogeneous datasets. Here the authors apply topological data analysis to assess therapeutic effects in preclinical traumatic brain injury and spinal cord injury research studies.
- Jessica L. Nielson
- , Jesse Paquette
- & Adam R. Ferguson
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A recoverable state of axon injury persists for hours after spinal cord contusion in vivo
A potential therapeutic strategy for spinal cord injury (SCI) is to maintain continuity of damaged axons after contusion, but the viability of such strategies depends on the degree to which initially injured axons can recover. Here the authors use morphological and molecular in vivoimaging after contusion SCI in mice, to show that injured axons persist in a metastable state for hours.
- Philip R. Williams
- , Bogdan-Nicolae Marincu
- & Thomas Misgeld
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The mTORC1 effectors S6K1 and 4E-BP play different roles in CNS axon regeneration
Activation of the mammalian target of rapamycin complex 1 in mature retinal ganglion cells promotes axonal regeneration in a mouse optic nerve crush model but the role of its downstream effectors is not clear. Here the authors show that S6K1 plays a dual role in axon regeneration, whereas 4E-BP inhibition is not sufficient but necessary for axon regeneration.
- Liu Yang
- , Linqing Miao
- & Yang Hu
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Prompt meningeal reconstruction mediated by oxygen-sensitive AKAP12 scaffolding protein after central nervous system injury
Reconstruction of damaged meninges is important for reducing neuronal damage after a brain injury. Here the authors identify AKAP12 as an effector that modulates meningeal reconstruction, and show that its expression is regulated by the upstream signals TGF-ß1, retinoic acid and oxygen tension.
- Jong-Ho Cha
- , Hee-Jun Wee
- & Kyu-Won Kim
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Sustained GSK3 activity markedly facilitates nerve regeneration
Studies focussing on pharmacological manipulation of the kinase GSK3 have provided contradictory roles on the involvement of GSK3 in axon regeneration. Here Gobrecht et al., study transgenic mice with altered GSK3 signalling and show that in contrast to previous reports, GSK3 enhances axon regeneration.
- Philipp Gobrecht
- , Marco Leibinger
- & Dietmar Fischer
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Article |
Enhancing adult nerve regeneration through the knockdown of retinoblastoma protein
Retinoblastoma protein (Rb) is a key inhibitor of cell cycle progression and its deletion is implicated in cancer. Here, the authors show that Rb is also involved in regulating nerve regeneration, since silencing Rb promotes neurite outgrowth and recovery of sensorimotor responses after nerve injury.
- Kimberly J. Christie
- , Anand Krishnan
- & Douglas Zochodne
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Large-scale reorganization of the somatosensory cortex following spinal cord injuries is due to brainstem plasticity
The reorganization of the mammalian somatosensory cortex is a common consequence of sensory deafferentation. Here, Kambi et al.show that reorganization of the cuneate nucleus in the brainstem is essential for the large-scale reorganization of the somatosensory cortex following sensory deafferentation in monkeys.
- Niranjan Kambi
- , Priyabrata Halder
- & Neeraj Jain
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PCAF-dependent epigenetic changes promote axonal regeneration in the central nervous system
Epigenetic codes translate external stimuli into targeted and long-lasting gene regulation. In this study, the authors show that regenerative retrograde signalling activates the epigenetic modifying enzyme PCAF, inducing gene expression and promoting axon regeneration in a mouse spinal cord injury model.
- Radhika Puttagunta
- , Andrea Tedeschi
- & Simone Di Giovanni
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Article |
In vivo conversion of astrocytes to neurons in the injured adult spinal cord
Expression of the transcription factor SOX2 reprogrammes astrocytes into neuroblasts in the adult mouse striatum. Here, the authors use the same approach in the injured adult mouse spinal cord to convert resident astrocytes into neuroblasts that can mature into synapse-forming neurons.
- Zhida Su
- , Wenze Niu
- & Chun-Li Zhang
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Article
| Open AccessChondroitin sulphate N-acetylgalactosaminyl-transferase-1 inhibits recovery from neural injury
The glycosaminoglycan chondroitin sulphate inhibits axon growth. Here the authors show that mice deficient in chondroitin sulphate biosynthesis have increased levels of heparan sulphate, which is more efficient than chondroitinase in supporting recovery from spinal cord injury.
- Kosei Takeuchi
- , Nozomu Yoshioka
- & Michihiro Igarashi
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Article |
PI3K–GSK3 signalling regulates mammalian axon regeneration by inducing the expression of Smad1
Nerve damage in the peripheral nervous system induces spontaneous axon regeneration. Saijilafu et al.show that this regeneration requires phosphatidylinositol 3-kinase signalling, which activates glycogen synthase kinase 3 and the transcription factor Smad1, and not mammalian target of rapamycin or ß-catenin.
- Saijilafu
- , Eun-Mi Hur
- & Feng-Quan Zhou
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Article |
Cross-talk between KLF4 and STAT3 regulates axon regeneration
Axon regeneration is controlled by both positive and negative regulators. In this study, Qin et al. show that KLF4 acts as an intrinsic inhibitor of axon regeneration by antagonizing the cytokine JAK–STAT3 pathway, and that deletion of KLF4 can greatly enhance cytokine-induced axon regeneration.
- Song Qin
- , Yuhua Zou
- & Chun-Li Zhang
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Article
| Open AccessIn-vivo single neuron axotomy triggers axon regeneration to restore synaptic density in specific cortical circuits
Unlike the peripheral nervous system, the adult central nervous system is not thought to spontaneously regenerate. Canty et al. use time-lapse imaging for periods of up to a year, to show that some axons in the mouse brain extend into unlesioned areas at speeds comparable to peripheral nerve regeneration.
- A. J. Canty
- , L. Huang
- & V. De Paola
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Article
| Open AccessEndocannabinoid-Goα signalling inhibits axon regeneration in Caenorhabditis elegans by antagonizing Gqα-PKC-JNK signalling
Axon regeneration inC. elegansis positively regulated by the JNK/MAP kinase pathway. Pastuhov and colleagues identify the endocannabinoid anandamide as a negative regulator of this pathway and show that anandamide inhibits axon regeneration in mature neurons after axotomy.
- Strahil Iv. Pastuhov
- , Kota Fujiki
- & Naoki Hisamoto
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Genetic dissection of axon regeneration via in vivo electroporation of adult mouse sensory neurons
Dorsal root ganglion neurons can regenerate after injury, but the mechanisms underlying axon regrowth are unclear. To address this, an electroporation transfection method is developed that can alter the gene expression of dorsal root ganglion cells in a living adult mouse, providing a tool to study axon regeneration.
- Saijilafu
- , Eun-Mi Hur
- & Feng-Quan Zhou
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Article
| Open AccessGlia- and neuron-specific functions of TrkB signalling during retinal degeneration and regeneration
The central nervous system contains glial cells, which have been shown to have an important role in neuronal survival. Haradaet al. use transgenic mouse models to show that TrkB, a receptor for the growth factor brain-derived neurotrophic factor, is required for retinal Müller glial cells to provide neuroprotection and regeneration.
- Chikako Harada
- , Xiaoli Guo
- & Takayuki Harada