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Wallerian degeneration

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https://www.readbyqxmd.com/read/28081156/generation-of-a-stable-transgenic-swine-model-expressing-a-porcine-histone-2b-egfp-fusion-protein-for-cell-tracking-and-chromosome-dynamics-studies
#1
Renan B Sper, Sehwon Koh, Xia Zhang, Sean Simpson, Bruce Collins, Jeff Sommer, Robert M Petters, Ignacio Caballero, Jeff L Platt, Jorge A Piedrahita
Transgenic pigs have become an attractive research model in the field of translational research, regenerative medicine, and stem cell therapy due to their anatomic, genetic and physiological similarities with humans. The development of fluorescent proteins as molecular tags has allowed investigators to track cell migration and engraftment levels after transplantation. Here we describe the development of two transgenic pig models via SCNT expressing a fusion protein composed of eGFP and porcine Histone 2B (pH2B)...
2017: PloS One
https://www.readbyqxmd.com/read/28072502/wallerian-degeneration-beyond-the-corticospinal-tracts-conventional-and-advanced-mri-findings
#2
REVIEW
Yin Jie Chen, Seyed Ali Nabavizadeh, Arastoo Vossough, Sunil Kumar, Laurie A Loevner, Suyash Mohan
Wallerian degeneration (WD) is defined as progressive anterograde disintegration of axons and accompanying demyelination after an injury to the proximal axon or cell body. Since the 1980s and 1990s, conventional magnetic resonance imaging (MRI) sequences have been shown to be sensitive to changes of WD in the subacute to chronic phases. More recently, advanced MRI techniques, such as diffusion-weighted imaging (DWI) and diffusion tensor imaging (DTI), have demonstrated some of earliest changes attributed to acute WD, typically on the order of days...
November 7, 2016: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28067783/stem-cell-transplantation-for-peripheral-nerve-regeneration-current-options-and-opportunities
#3
REVIEW
Liangfu Jiang, Salazar Jones, Xiaofeng Jia
Peripheral nerve regeneration is a complicated process highlighted by Wallerian degeneration, axonal sprouting, and remyelination. Schwann cells play an integral role in multiple facets of nerve regeneration but obtaining Schwann cells for cell-based therapy is limited by the invasive nature of harvesting and donor site morbidity. Stem cell transplantation for peripheral nerve regeneration offers an alternative cell-based therapy with several regenerative benefits. Stem cells have the potential to differentiate into Schwann-like cells that recruit macrophages for removal of cellular debris...
January 5, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28053206/gsk3b-mediated-phosphorylation-of-mcl1-regulates-axonal-autophagy-to-promote-wallerian-degeneration
#4
Shuji Wakatsuki, Shinji Tokunaga, Megumi Shibata, Toshiyuki Araki
Macroautophagy is a catabolic process, in which portions of cytoplasm or organelles are delivered to lysosomes for degradation. Emerging evidence has indicated a pathological connection between axonal degeneration and autophagy. However, the physiological function and induction mechanism of autophagy in axons remain elusive. We herein show that, through activation of BECLIN1, glycogen synthase kinase 3B (GSK3B)-mediated phosphorylation of BCL2 family member MCL1 induces axonal autophagy and axonal degeneration...
January 4, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28040732/mutant-profilin1-transgenic-mice-recapitulate-cardinal-features-of-motor-neuron-disease
#5
Daniel Fil, Abigail DeLoach, Shilpi Yadav, Duah Alkam, Melanie MacNicol, Awantika Singh, Cesar M Compadre, Joseph J Goellner, Charles A O'Brien, Tariq Fahmi, Alexei G Basnakian, Noel Y Calingasan, Jodi L Klessner, M Flint Beal, Owen M Peters, Jake Metterville, Robert H Brown, Karen K Y Ling, Frank Rigo, P Hande Ozdinler, Mahmoud Kiaei
The recent identification of profilin1 mutations in 25 familial ALS cases has linked altered function of this cytoskeleton-regulating protein to the pathogenesis of motor neuron disease. To investigate the pathological role of mutant profilin1 in motor neuron disease, we generated transgenic lines of mice expressing human profilin1 with a mutation at position 118 (hPFN1(G118V)). One of the mouse lines expressing high levels of mutant human PFN1 protein in the brain and spinal cord exhibited many key clinical and pathological features consistent with human ALS disease...
December 30, 2016: Human Molecular Genetics
https://www.readbyqxmd.com/read/28008990/experimental-immunological-demyelination-enhances-regeneration-in-autograft-repaired-long-peripheral-nerve-gaps
#6
Jun Ge, Shu Zhu, Yafeng Yang, Zhongyang Liu, Xueyu Hu, Liangliang Huang, Xin Quan, Meng Wang, Jinghui Huang, Yunqing Li, Zhuojing Luo
Peripheral nerve long gap defects are a clinical challenge in the regeneration field. Despite the wide variety of surgical techniques and therapies, autografting is the "gold standard" for peripheral nerve gap reconstruction. The pathological process of Wallerian degeneration from the time of acute injury to efficient regeneration requires several weeks. Regeneration time is critical for nerve reconstruction. Immunological demyelination induced by anti-galactocerebroside antibodies plus guinea pig complement was used to shorten the treatment time...
December 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27999531/ingenuity-pathway-analysis-of-gene-expression-profiles-in-distal-nerve-stump-following-nerve-injury-insights-into-wallerian-degeneration
#7
Jun Yu, Xiaosong Gu, Sheng Yi
Nerve injury is a common and difficult clinical problem worldwide with a high disability rate. Different from the central nervous system, the peripheral nervous system is able to regenerate after injury. Wallerian degeneration in the distal nerve stump contributes to the construction of a permissible microenvironment for peripheral nerve regeneration. To gain new molecular insights into Wallerian degeneration, this study aimed to identify differentially expressed genes and elucidate significantly involved pathways and cellular functions in the distal nerve stump following nerve injury...
2016: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/27973735/the-role-of-p38alpha-in-schwann-cells-in-regulating-peripheral-nerve-myelination-and-repair
#8
Sheridan L Roberts, Xin-Peng Dun, Gemma Dee, Bethany Gray, Thomas Mindos, David B Parkinson
Myelination in the peripheral nervous system (PNS) is controlled by both positive and negative regulators within Schwann cells to ensure timely onset and correct myelin thickness for saltatory conduction by neurons. Transcription factors such as Sox10, Oct6 and Krox20 form a positive regulatory network, whereas negative regulators such as cJun and Sox2 oppose myelination in Schwann cells. The role of the p38 mitogen activated protein kinase (MAPK) pathway has been studied in PNS myelination, but its precise function remains unclear, with both positive and negative effects of p38 activity reported upon both myelination and processes of nerve repair...
December 14, 2016: Journal of Neurochemistry
https://www.readbyqxmd.com/read/27903814/blink-associated-contralateral-eccentric-saccades-as-a-rare-sign-of-unilateral-brain-injury
#9
Ilaria Zivi, Eugenio Bertelli, Giacinta Bilotti, Ignazio Alessandro Clemente, Leopold Saltuari, Giuseppe Frazzitta
OBJECTIVE: To describe a rare sign of unilateral brain injury as a form of unwanted blink-associated contralateral eccentric saccades. METHODS: A 62-year-old patient who underwent an ischemic stroke affecting the entire right middle cerebral artery territory came to our attention 1 year after stroke, manifesting with transient contralateral conjugate gaze deviations associated with spontaneous blinking. We complemented the regular neurologic evaluation with brain MRI, study of evoked potentials, electroneurography of the facial nerve, and infrared video-oculoscopy...
January 10, 2017: Neurology
https://www.readbyqxmd.com/read/27894923/therapeutic-implications-of-toll-like-receptors-in-peripheral-neuropathic-pain
#10
REVIEW
Krishan K Thakur, Jyoti Saini, Kanika Mahajan, Dhyanendra Singh, Dinkar P Jayswal, Srishti Mishra, Anupam Bishyaee, Gautam Sethi, Ajaikumar B Kunnumakkara
Neuropathic pain is a state of chronic pain arising after peripheral or central nerve injury. These injuries can be mediated through the activation of various cells (astrocytes, microglia and Schwann cells), as well as the dissolution of distal axons. Recent studies have suggested that after nerve injury, Toll-like receptors (TLRs) involved in Wallerian degeneration and generation of neuropathic pain. Furthermore, these TLRs are responsible for the stimulation of astrocytes and microglia that can cause induction of the proinflammatory mediators and cytokines in the spinal cord, thereby leading to the generation and maintenance of neuropathic pain...
January 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27878997/corneal-epithelial-cells-function-as-surrogate-schwann-cells-for-their-sensory-nerves
#11
REVIEW
Mary Ann Stepp, Gauri Tadvalkar, Raymond Hakh, Sonali Pal-Ghosh
The eye is innervated by neurons derived from both the central nervous system and peripheral nervous system (PNS). While much is known about retinal neurobiology and phototransduction, less attention has been paid to the innervation of the eye by the PNS and the roles it plays in maintaining a functioning visual system. The ophthalmic branch of the trigeminal ganglion contains somas of neurons that innervate the cornea. These nerves provide sensory functions for the cornea and are referred to as intraepithelial corneal nerves (ICNs) consisting of subbasal nerves and their associated intraepithelial nerve terminals...
November 23, 2016: Glia
https://www.readbyqxmd.com/read/27875622/neurographic-course-of-wallerian-degeneration-after-human-peripheral-nerve-injury
#12
Maria Eder, Wilhelm Schulte-Mattler, Peter Pöschl
INTRODUCTION: Neurographic data on Wallerian degeneration (WD) following motor nerve injury are available only from animal studies and from human case reports of 9 patients altogether. A precise knowledge of neurographic features of WD would be highly relevant for diagnostic, prognostic, therapeutic, and forensic aspects of traumatic lesions. METHODS: We prospectively studied WD in patients with a peripheral nerve injury. They underwent sequential neurographic examinations beginning no later than 3 days after the injury until a plateau of the amplitude of compound muscle action potential was reached...
November 22, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27833045/reciprocal-relationship-between-membrane-type-1-matrix-metalloproteinase-and-the-algesic-peptides-of-myelin-basic-protein-contributes-to-chronic-neuropathic-pain
#13
Sanghyun Hong, Albert G Remacle, Sergei A Shiryaev, Wonjun Choi, Swathi K Hullugundi, Jennifer Dolkas, Mila Angert, Tasuku Nishihara, Tony L Yaksh, Alex Y Strongin, Veronica I Shubayev
Myelin basic protein (MBP) is an auto-antigen able to induce intractable pain from innocuous mechanical stimulation (mechanical allodynia). The mechanisms provoking this algesic MBP activity remain obscure. Our present study demonstrates that membrane type 1 matrix metalloproteinase (MT1-MMP/MMP-14) releases the algesic MBP peptides from the damaged myelin, which then reciprocally enhance the expression of MT1-MMP in nerve to sustain a state of allodynia. Specifically, MT1-MMP expression and activity in rat sciatic nerve gradually increased starting at day 3 after chronic constriction injury (CCI)...
February 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/27832912/diffusion-restriction-in-the-corticospinal-tracts-and-the-corpus-callosum-in-neonates-after-cerebral-insult
#14
Monika Bekiesinska-Figatowska, Agnieszka Duczkowska, Sylwia Szkudlinska-Pawlak, Marek Duczkowski, Jaroslaw Madzik, Astra Cabaj, Katarzyna Krupa, Pawel Peczkowski, Hanna Bragoszewska
BACKGROUND: In neonatal brains diffusion restriction, which is not limited to the region of insult, but is also found in distant locations from it seems to be a frequent finding, called pre-Wallerian degeneration. OBJECTIVES: The purpose of this study was to describe these findings and to estimate the frequency of their occurrence with an attempt to determine their clinical significance. METHODS: 125 brain MRI examinations of neonates with confirmed brain damage performed or consulted in our Institute were retrospectively reviewed, focusing on the presence of restricted diffusion in corticospinal tracts (CST) and corpus callosum (CC)...
November 7, 2016: Brain & Development
https://www.readbyqxmd.com/read/27822499/acute-axonal-degeneration-drives-development-of-cognitive-motor-and-visual-deficits-after-blast-mediated-traumatic-brain-injury-in-mice
#15
Terry C Yin, Jaymie R Voorhees, Rachel M Genova, Kevin C Davis, Ashley M Madison, Jeremiah K Britt, Coral J Cintrón-Pérez, Latisha McDaniel, Matthew M Harper, Andrew A Pieper
Axonal degeneration is a prominent feature of many forms of neurodegeneration, and also an early event in blast-mediated traumatic brain injury (TBI), the signature injury of soldiers in Iraq and Afghanistan. It is not known, however, whether this axonal degeneration is what drives development of subsequent neurologic deficits after the injury. The Wallerian degeneration slow strain (WldS) of mice is resistant to some forms of axonal degeneration because of a triplicated fusion gene encoding the first 70 amino acids of Ufd2a, a ubiquitin-chain assembly factor, that is linked to the complete coding sequence of nicotinamide mononucleotide adenylyltransferase 1 (NMAT1)...
September 2016: ENeuro
https://www.readbyqxmd.com/read/27771719/toll-like-receptor-3-contributes-to-wallerian-degeneration-after-peripheral-nerve-injury
#16
Hyunkyoung Lee, Jiyeon Baek, Hyunjung Min, Ik-Hyun Cho, Seong-Woo Yu, Sung Joong Lee
OBJECTIVE: It is well known that Schwann cells play an important role in Wallerian degeneration after peripheral nerve injury. Previously, we reported that toll-like receptor 3 (TLR3) is expressed on Schwann cells, implicating its role in Schwann cell activation during Wallerian degeneration. In this study, we tested this possibility using TLR3 knock-out mice. METHODS: Sciatic nerve-crush injury was induced in wild-type and TLR3 knock-out mice. Histological sections of the sciatic nerve were analyzed for Wallerian degeneration on days 3 and 7 after injury...
October 22, 2016: Neuroimmunomodulation
https://www.readbyqxmd.com/read/27744468/mri-findings-in-a-case-of-spinal-cord-wallerian-degeneration-following-trauma
#17
Puneet Mittal, Ranjana Gupta, Amit Mittal, Kapish Mittal
No abstract text is available yet for this article.
October 2016: Neurosciences: the Official Journal of the Pan Arab Union of Neurological Sciences
https://www.readbyqxmd.com/read/27732853/an-atypical-scf-like-ubiquitin-ligase-complex-promotes-wallerian-degeneration-through-regulation-of-axonal-nmnat2
#18
Yuya Yamagishi, Marc Tessier-Lavigne
Axon degeneration is a tightly regulated, self-destructive program that is a critical feature of many neurodegenerative diseases, but the molecular mechanisms regulating this program remain poorly understood. Here, we identify S-phase kinase-associated protein 1A (Skp1a), a core component of a Skp/Cullin/F-box (SCF)-type E3 ubiquitin ligase complex, as a critical regulator of axon degeneration after injury in mammalian neurons. Depletion of Skp1a prolongs survival of injured axons in vitro and in the optic nerve in vivo...
October 11, 2016: Cell Reports
https://www.readbyqxmd.com/read/27726416/zika-virus-associated-micrencephaly-a-thorough-description-of-neuropathologic-findings-in-the-fetal-central-nervous-system
#19
Peter Štrafela, Alenka Vizjak, Jerica Mraz, Jernej Mlakar, Jože Pižem, Nataša Tul, Tatjana Avšič Županc, Mara Popović
CONTEXT: -The 2015 outbreak of Zika virus in Brazil resulted in a 20-times increased prevalence of congenital microcephaly in stillborns and neonates and was instrumental in raising the suspicion of a causal association between Zika virus and microcephaly. OBJECTIVE: -To provide a comprehensive description of the neuropathologic features of congenital Zika virus infection. DESIGN: -Autopsy evaluation of the brain from a fetus of 32 weeks and 6 days of gestation, with a prenatal diagnosis of microcephaly associated with polymerase chain reaction-confirmed, fetal, Zika virus infection...
January 2017: Archives of Pathology & Laboratory Medicine
https://www.readbyqxmd.com/read/27671902/neurodegeneration-in-multiple-sclerosis-and-neuromyelitis-optica
#20
REVIEW
Izumi Kawachi, Hans Lassmann
Multiple sclerosis (MS) and neuromyelitis optica (NMO) are autoimmune demyelinating diseases of the central nervous system (CNS), having distinct immunological and pathological features. They have two pathogenic components, 'inflammation' and 'neurodegeneration', with different degrees of severity and pathogenetic mechanisms. The target antigen of autoimmunity in NMO is the water channel aquaporin-4 (AQP4), and antibodies directed against this antigen result in astrocyte damage. MS is a disease primarily affecting myelin and oligodendrocytes, but thus far, no MS-specific autoantigen has been identified...
September 26, 2016: Journal of Neurology, Neurosurgery, and Psychiatry
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