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    31 October 2016, Volume 11 Issue 10 Previous Issue    Next Issue
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    Clearing the corpses: regulatory mechanisms, novel tools, and therapeutic potential of harnessing microglial phagocytosis in the diseased brain
    Irune Diaz-Aparicio, Sol Beccari, Oihane Abiega, Amanda Sierra
    2016, 11 (10):  1533-1539.  doi: 10.4103/1673-5374.193220
    Abstract ( 296 )   PDF (803KB) ( 720 )   Save
    Apoptosis is a widespread phenomenon that occurs in the brain in both physiological and pathological conditions. Dead cells must be quickly removed to avoid the further toxic e?ects they exert in the parenchyma, a process executed by microglia, the brain professional phagocytes. Although phagocytosis is critical to maintain tissue homeostasis, it has long been either overlooked or indirectly assessed based on microglial morphology, expression of classical activation markers, or engulfment of artifcial phagocytic targets in vitro. Nevertheless, these indirect methods present several limitations and, thus, direct observation and quantifcation of microglial phagocytosis is still necessary to fully grasp its relevance in the diseased brain. To overcome these caveats and obtain a comprehensive, quantitative picture of microglial phagocytosis we have developed a novel set of parameters. Tese parameters have allowed us to identify the di?erent strategies utilized by microglia to cope with apoptotic challenges induced by excitotoxicity or in?ammation. In contrast, we discovered that in mouse and human epilepsy microglia failed to fnd and engulf apoptotic cells, resulting in accumulation of debris and in?ammation. Herein, we advocate that the efciency of microglial phagocytosis should be routinely tested in neurodegenerative and neurological disorders, in order to determine the extent to which it contributes to apoptosis and in?ammation found in these conditions. Finally, our fndings point towards enhancing microglial phagocytosis as a novel therapeutic strategy to control tissue damage and in?ammation, and accelerate recovery in brain diseases.
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    Perspectives on the role of Pannexin 1 in neural precursor cell biology
    Juan C. Sanchez-Arias, Leigh E. Wicki-Stordeur, Leigh Anne Swayne
    2016, 11 (10):  1540-1544.  doi: 10.4103/1673-5374.193221
    Abstract ( 204 )   PDF (381KB) ( 398 )   Save
    We recently reported that targeted deletion of Pannexin 1 in neural precursor cells of the ventricular zone impairs the maintenance of these cells in healthy and stroke-injured brain. Here we frame this exciting new fnding in the context of our previous studies on Pannexin 1 in neural precursors as well as the close relationship between Pannexin 1 and purinergic receptors established by other groups. Moreover, we identify important gaps in our understanding of Pannexin 1 in neural precursor cell biology in terms of the underlying molecular mechanisms and functional/behavioural outcomes.
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    Poly(ADP-ribose) polymerase inhibition reveals a potential mechanism to promote neuroprotection and treat neuropathic pain
    Prashanth Komirishetty, Aparna Areti, Ranadeep Gogoi, Ramakrishna Sistla, Ashutosh Kumar
    2016, 11 (10):  1545-1548.  doi: 10.4103/1673-5374.193222
    Abstract ( 242 )   PDF (310KB) ( 437 )   Save

    Neuropathic pain is triggered by the lesions to peripheral nerves which alter their structure and function. Neuroprotective approaches that limit the pathological changes and improve the behavioral outcome have been well explained in di?erent experimental models of neuropathy but translation of such strategies to clinics has been disappointing. Experimental evidences revealed the role of free radicals, especially peroxynitrite afer the nerve injury. Tey provoke oxidative DNA damage and consequent over-activation of the poly(ADP-ribose) polymerase (PARP) upregulates pro-in?ammatory pathways, causing bioenergetic crisis and neuronal death. Along with these changes, it causes mitochondrial dysfunction leading to neuronal apoptosis. In related preclinical studies agents that neutralize the free radicals and pharmacological inhibitors of PARP have shown benefts in treating experimental neuropathy. Tis article reviews the involvement of PARP over-activation in trauma induced neuropathy and therapeutic signifcance of PARP inhibitors in the experimental neuropathy and neuropathic pain.

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    Transforming growth factor beta 1, a cytokine with regenerative functions
    Wale Sulaiman, Doan H. Nguyen
    2016, 11 (10):  1549-1552.  doi: 10.4103/1673-5374.193223
    Abstract ( 329 )   PDF (355KB) ( 466 )   Save
    "We review the biology and role of transforming growth factor beta 1 (TGF-β1) in peripheral nerve injury and regeneration, as it relates to injuries to large nerve trunks (i.e., sciatic nerve, brachial plexus), which ofen leads to suboptimal functional recovery. Experimental studies have suggested that the reason for the lack of functional recovery resides in the lack of sufcient mature axons reaching their targets, which is a result of the loss of the growth-supportive environment provided by the Schwann cells in the distal stump of injured nerves. Using an established chronic nerve injury and delayed repair animal model that accurately mimics chronic nerve injuries in humans, we summarize our key fndings as well as others to better understand the pathophysiology of poor functional recovery. We demonstrated that 6 month TGF-β1 treatment for chronic nerve injury signifcantly improved Schwann cell capacity to support axonal regeneration. When combined with forskolin, the e?ect was additive, as evidenced by a near doubling of regenerated axons proximal to the repair site. We showed that in vivo application of TGF-β1 and forskolin directly onto chronically injured nerves reactivated chronically denervated Schwann cells, induced their proliferation, and upregulated the expression of regeneration-associated proteins. Te e?ect of TGF-β1 and forskolin on old nerve injuries is quite impressive and the treatment regiment appears to mediate a growth-supportive milieu in the injured peripheral nerves. In summary, TGF-β1 and forskolin treatment reactivates chronically denervated Schwann cells and could potentially be used to extend and prolong the regenerative responses to promote axonal regeneration"
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    Impairment of the nerve growth factor pathway driving amyloid accumulation in cholinergic neurons: the incipit of the Alzheimer’s disease story?
    Viviana Triaca, Pietro Calissano
    2016, 11 (10):  1553-1556.  doi: 10.4103/1673-5374.193224
    Abstract ( 251 )   PDF (332KB) ( 768 )   Save
    The current idea behind brain pathology is that disease is initiated by mild disturbances of common physiological processes. Overtime, the disruption of the neuronal homeostasis will determine irreversible degeneration and neuronal apoptosis. Tis could be also true in the case of nerve growth factor (NGF) alterations in sporadic Alzheimer’s disease (AD), an age-related pathology characterized by cholinergic loss, amyloid plaques and neurofibrillary tangles. In fact, the pathway activated by NGF, a key neurotrophin for the metabolism of basal forebrain cholinergic neurons (BFCN), is one of the frst homeostatic systems a?ected in prodromal AD. NGF signaling dysfunctions have been thought for decades to occur in AD late stages, as a mere consequence of amyloid-driven disruption of the retrograde axonal transport of neurotrophins to BFCN. Nowadays, a wealth of knowledge is potentially opening a new scenario: NGF signaling impairment occurs at the onset of AD and correlates better than amyloid load with cognitive decline. Te recent acceleration in the characterization of anatomical, functional and molecular profles of early AD is aimed at maximizing the efficacy of existing treatments and setting novel therapies. Accordingly, the elucidation of the molecular events underlying APP metabolism regulation by the NGF pathway in the septo-hippocampal system is crucial for the identifcation of new target molecules to slow and eventually halt mild cognitive impairment (MCI) and its progression toward AD.
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    Axon injury induced endoplasmic reticulum stress and neurodegeneration
    Yang Hu
    2016, 11 (10):  1557-1559.  doi: 10.4103/1673-5374.193225
    Abstract ( 339 )   PDF (151KB) ( 654 )   Save
    Injury to central nervous system axons is a common early characteristic of neurodegenerative diseases. Depending on its location and the type of neuron, axon injury ofen leads to axon degeneration, retrograde neuronal cell death and progressive permanent loss of vital neuronal functions. Although these sequential events are clearly connected, ample evidence indicates that neuronal soma and axon degenerations are active autonomous processes with distinct molecular mechanisms. By exploiting the anatomical and technical advantages of the retinal ganglion cell (RGC)/optic nerve (ON) system, we demonstrated that inhibition of the PERK-eIF2α-CHOP pathway and activation of the X-box binding protein 1 pathway synergistically protect RGC soma and axon, and preserve visual function, in both acute ON traumatic injury and chronic glaucomatous neuropathy. The autonomous endoplasmic reticulum (ER) stress pathway in neurons has been implicated in several other neurodegenerative diseases. In addition to the emerging role of ER morphology in axon maintenance, we propose that ER stress is a common upstream signal for disturbances in axon integrity, and that it leads to a retrograde signal that can subsequently induce neuronal soma death. Terefore manipulation of the ER stress pathway may be a key step toward developing the e?ective neuroprotectants that are greatly needed in the clinic.
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    Neuro-rejuvenation for neuronal function
    Yuan Liu, Richard K. Lee
    2016, 11 (10):  1560-1563.  doi: 10.4103/1673-5374.193226
    Abstract ( 321 )   PDF (262KB) ( 361 )   Save
    Neurodegenerative eye diseases, such as glaucoma, cause irreversible vision loss in millions of patients worldwide, creating serious medical, economic and social issues. Like other mammalian central nervous system tracts, optic nerve intrinsically lacks the capacity for axonal growth and its surrounding environment is also non-permissive to regeneration. Any axonal damage also triggers a vicious cycle of retinal ganglion cell (RGC) death. Exploring methods that can enhance RGCs survival and promote axonal regeneration will not only enable vision restoration for millions of patients, but also shed light on the treatment of other neurodegenerative diseases. In this review article, we will go through three current approaches to cure neurodegenerative eye diseases, including cell based therapy, neuro-regeneration and neuro-rejuvenation.
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    Valproic acid as a microRNA modulator to promote neurite outgrowth
    Hirotaka Oikawa, Judy C. G. Sng
    2016, 11 (10):  1564-1565.  doi: 10.4103/1673-5374.193227
    Abstract ( 198 )   PDF (387KB) ( 396 )   Save
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    Parthenolide: a novel pharmacological approach to promote nerve regeneration
    Heike Diekmann, Dietmar Fischer
    2016, 11 (10):  1566-1567.  doi: 10.4103/1673-5374.193228
    Abstract ( 282 )   PDF (141KB) ( 433 )   Save
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    Engineering personalized neural tissue using functionalized transcription factors
    Stephanie M. Willerth
    2016, 11 (10):  1570-1571.  doi: 10.4103/1673-5374.193229
    Abstract ( 181 )   PDF (232KB) ( 391 )   Save
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    Bridging large gaps in the injured spinal cord: mechanical and biochemical tissue adaptation
    Veronica Estrada, Hans Werner Müller
    2016, 11 (10):  1572-1574.  doi: 10.4103/1673-5374.193232
    Abstract ( 119 )   PDF (360KB) ( 402 )   Save
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    Drug- and cell-based therapies for targeting neuroin?ammation in traumatic brain injury
    Sussannah Kaelber, Paolina Pantcheva, Cesar V. Borlongan
    2016, 11 (10):  1575-1576.  doi: 10.4103/1673-5374.193231
    Abstract ( 414 )   PDF (132KB) ( 334 )   Save
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    Tayloring cell populations for neurodegenerative diseases
    Jeff M. Fortin, Loic P. Deleyrolle, Brent A. Reynolds
    2016, 11 (10):  1582-1583.  doi: 10.4103/1673-5374.193235
    Abstract ( 249 )   PDF (122KB) ( 360 )   Save
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    E?ects of di?erent frequencies of repetitive transcranial magnetic stimulation on the recovery of upper limb motor dysfunction in patients with subacute cerebral infarction
    Jiang Li, Xiang-min Meng, Ru-yi Li, Ru Zhang, Zheng Zhang, Yi-feng Du
    2016, 11 (10):  1584-1590.  doi: 10.4103/1673-5374.193236
    Abstract ( 200 )   PDF (472KB) ( 427 )   Save
    Studies have confirmed that low-frequency repetitive transcranial magnetic stimulation can decrease the activity of cortical neurons, and high-frequency repetitive transcranial magnetic stimulation can increase the excitability of cortical neurons. However, there are few studies concerning the use of di?erent frequencies of repetitive transcranial magnetic stimulation on the recovery of upper-limb motor function afer cerebral infarction. We hypothesized that di?erent frequencies of repetitive transcranial magnetic stimulation in patients with cerebral infarction would produce di?erent e?ects on the recovery of upper-limb motor function. Tis study enrolled 127 patients with upper-limb dysfunction during the subacute phase of cerebral infarction. Tese patients were randomly assigned to three groups. Te low-frequency group comprised 42 patients who were treated with 1 Hz repetitive transcranial magnetic stimulation on the contralateral hemisphere primary motor cortex (M1). Te high-frequency group comprised 43 patients who were treated with 10 Hz repetitive transcranial magnetic stimulation on ipsilateral M1. Finally, the sham group comprised 42 patients who were treated with 10 Hz of false stimulation on ipsilateral M1. A total of 135 seconds of stimulation was applied in the sham group and high-frequency group. At 2 weeks afer treatment, cortical latency of motor-evoked potentials and central motor conduction time were signifcantly lower compared with before treatment. Moreover, motor function scores were signifcantly improved. Te above indices for the low- and high-frequency groups were signifcantly di?erent compared with the sham group. However, there was no signifcant di?erence between the low- and high-frequency groups. Te results show that low- and high-frequency repetitive transcranial magnetic stimulation can similarly improve upper-limb motor function in patients with cerebral infarction.
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    Speech and language therapy for aphasia following subacute stroke
    Engin Koyuncu, Pınar Çam, Nermin Altınok, Duygu Ekinci Çallı, Tuba Yarbay Duman, Neşe Özgirgin
    2016, 11 (10):  1591-1594.  doi: 10.4103/1673-5374.193237
    Abstract ( 229 )   PDF (207KB) ( 690 )   Save
    Te aim of this study was to investigate the time window, duration and intensity of optimal speech and language therapy applied to aphasic patients with subacute stroke in our hospital. Te study consisted of 33 patients being hospitalized for stroke rehabilitation in our hospital with frst stroke but without previous history of speech and language therapy. Sixteen sessions of impairment-based speech and language therapy were applied to the patients, 30–60 minutes per day, 2 days a week, for 8 successive weeks. Aphasia assessment in stroke patients was performed with Gülhane Aphasia Test-2 before and afer treatment. Compared with before treatment, fluency of speech, listening comprehension, reading comprehension, oral motor evaluation, automatic speech, repetition and naming were improved afer treatment. Tis suggests that 16 seesions of speech and language therapy, 30–60 minutes per day, 2 days a week, for 8 successive weeks, are e?ective in the treatment of aphasic patients with subacute stroke.
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    Intravenous transplantation of mouse embryonic stem cells attenuates demyelination in an ICR outbred mouse model of demyelinating diseases
    Kidsadagon Pringproa, Anucha Sathanawongs, Chananthida Khamphilai, Sarocha Sukkarinprom, Apichart Oranratnachai
    2016, 11 (10):  1603-1609.  doi: 10.4103/1673-5374.193239
    Abstract ( 255 )   PDF (3896KB) ( 400 )   Save
    Induction of demyelination in the central nervous system (CNS) of experimental mice using cuprizone is widely used as an animal model for studying the pathogenesis and treatment of demyelination. However, different mouse strains used result in different pathological outcomes. Moreover, because current medicinal treatments are not always e?ective in multiple sclerosis patients, so the study of exogenous cell transplantation in an animal model is of great importance. Te aims of the present study were to establish an alternative ICR outbred mouse model for studying demyelination and to evaluate the e?ects of intravenous cell transplantation in the present developed mouse model. Two sets of experiments were conducted. Firstly, ICR outbred and BALB/c inbred mice were fed with 0.2% cuprizone for 6 consecutive weeks; then demyelinating scores determined by luxol fast blue stain or immunolabeling with CNPase were evaluated. Secondly, attenuation of demyelination in ICR mice by intravenous injection of mES cells was studied. Scores for demyelination in the brains of ICR mice receiving cell injection (mES cells-injected group) and vehicle (sham-inoculated group) were assessed and compared. Te results showed that cuprizone signifcantly induced demyelination in the cerebral cortex and corpus callosum of both ICR and BALB/c mice. Additionally, intravenous transplantation of mES cells potentially attenuated demyelination in ICR mice compared with sham-inoculated groups. Te present study is among the earliest reports to describe the cuprizone-induced demyelination in ICR outbred mice. Although it remains unclear whether mES cells or trophic e?ects from mES cells are the cause of enhanced remyelination, the results of the present study may shed some light on exogenous cell therapy in central nervous system demyelinating diseases.
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    Hydroxycitric acid ameliorates in?ammation and oxidative stress in mouse models of multiple sclerosis
    Mahdi Goudarzvand, Sanaz Afraei, Somaye Yaslianifard, Saleh Ghiasy, Ghazal Sadri, Mustafa Kalvandi, Tina Alinia, Ali Mohebbi, Reza Yazdani, Shahin Khadem Azarian, Abbas Mirshafey, Gholamreza Azizi
    2016, 11 (10):  1610-1616.  doi: 10.4103/1673-5374.193240
    Abstract ( 286 )   PDF (538KB) ( 438 )   Save
    Hydroxycitric acid (HCA) is derived primarily from the Garcinia plant and is widely used for its anti-in?ammatory e?ects. Multiple sclerosis can cause an in?ammatory demyelination and axonal damage. In this study, to validate the hypothesis that HCA exhibits therapeutic e?ects on multiple sclerosis, we established female C57BL/6 mouse models of multiple sclerosis, i.e., experimental autoimmune encephalomyelitis, using Complete Freund’s Adjuvant (CFA) emulsion containing myelin oligodendrocyte glycoprotein (35–55). Treatment with HCA at 2 g/kg/d for 3 weeks obviously improved the symptoms of nerve injury of experimental autoimmune encephalomyelitis mice, decreased serum interleulin-6, tumor necrosis factor alpha, nitric oxide, and malondialdehyde levels, and increased superoxide dismutase and glutathione reductase activities. Tese fndings suggest that HCA exhibits neuroprotective e?ects on multiple sclerosis-caused nerve injury through ameliorating in?ammation and oxidative stress.
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    Beta 2-adrenergic receptor activation enhances neurogenesis in Alzheimer’s disease mice
    Gao-shang Chai, Yang-yang Wang, Amina Yasheng, Peng Zhao
    2016, 11 (10):  1617-1624.  doi: 10.4103/1673-5374.193241
    Abstract ( 228 )   PDF (2100KB) ( 406 )   Save
    Impaired hippocampal neurogenesis is one of the early pathological features of Alzheimer’s disease. Enhancing adult hippocampal neurogenesis has been pursued as a potential therapeutic strategy for Alzheimer’s disease. Recent studies have demonstrated that environmental novelty activates β2-adrenergic signaling and prevents the memory impairment induced by amyloid-β oligomers. Here, we hypothesized that β2-adrenoceptor activation would enhance neurogenesis and ameliorate memory defcits in Alzheimer’s disease. To test this hypothesis, we investigated the e?ects and mechanisms of action of β2-adrenoceptor activation on neurogenesis and memory in amyloid precursor protein/presenilin 1 (APP/PS1) mice using the agonist clenbuterol (intraperitoneal injection, 2 mg/kg). We found that β2-adrenoceptor activation enhanced hippocampal neurogenesis, ameliorated memory defcits, and increased dendritic branching and the density of dendritic spines. Tese e?ects were associated with the upregulation of postsynaptic density 95, synapsin 1 and synaptophysin in APP/PS1 mice. Furthermore, β2-adrenoceptor activation decreased cerebral amyloid plaques by decreasing APP phosphorylation at Tr668. Tese fndings suggest that β2-adrenoceptor activation enhances neurogenesis and ameliorates memory defcits in APP/PS1 mice.
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    Anti-apoptotic e?ect of Shudipingchan granule in the substantia nigra of rat models of Parkinson’s disease
    Qing Ye, Xiao-lei Yuan, Jing He, Jie Zhou, Can-xing Yuan, Xu-ming Yang
    2016, 11 (10):  1625-1632.  doi: 10.4103/1673-5374.193242
    Abstract ( 309 )   PDF (2045KB) ( 625 )   Save
    Levodopa is the gold-standard treatment for Parkinson’s disease. However, although it alleviates the clinical symptoms, it cannot delay the progressive apoptosis of dopaminergic neurons or prevent motor complications in the long term. In the present study, we investigated the e?ect of Shudipingchan granule on neuronal apoptosis in a rat model of Parkinson’s disease, established by injecting 6-hydroxydopamine into the substantia nigra pars compacta and ventral tegmental area. We then administered levodopa (20 mg/kg intraperitoneally, twice daily) with or without Shudipingchan granule (7.5 mL/kg intragastrically, twice daily), for 4 weeks. Te long-term use of levodopa accelerated apoptosis of nigral cells and worsened behavioral symptoms by activating the extracellular signal-regulated kinase pathway and downstream apoptotic factors. However, administration of Shudipingchan granule with levodopa reduced expression of phosphorylated extracellular signal-regulated kinase 1/2 and Bax, increased tyrosine hydroxylase and Bcl-2, reduced apoptosis in the substantia nigra, and markedly improved dyskinesia. Tese fndings suggest that Shudipingchan granule suppresses neuronal apoptosis by inhibiting the hyperphosphorylation of extracellular signal-regulated kinase and downregulating expression of anti-apoptotic genes. Shudipingchan granule, used in combination with levodopa, can e?ectively reduce the symptoms of Parkinson’s disease.
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    Higher frequency of brain abnormalities in neuromyelitis optica spectrum disorder patients without primary Sj?gren’s syndrome
    Li-na Gu, Min Zhang, Hui Zhu, Jing-yao Liu
    2016, 11 (10):  1633-1637.  doi: 10.4103/1673-5374.193243
    Abstract ( 245 )   PDF (585KB) ( 535 )   Save
    Neuromyelitis optica spectrum disorder ofen co-exists with primary Sj?gren’s syndrome. We compared the clinical features of 16 neuromyelitis optica spectrum disorder patients with (n = 6) or without primary Sj?gren’s syndrome (n = 10). All patients underwent extensive clinical, laboratory, and MRI evaluations. Tere were no statistical di?erences in demographics or frst neurological involvement at onset between neuromyelitis optica spectrum disorder patients with and without primary Sj?gren’s syndrome. The laboratory findings of cerebrospinal ?uid oligoclonal banding, serum C-reactive protein, antinuclear autoantibody, anti-Sj?gren’s-syndrome-related antigen A antibodies, anti-Sj?gren’s-syndrome-related antigen B antibodies, and anti-Sm antibodies were signifcantly higher in patients with primary Sj? gren’s syndrome than those without. Anti-aquaporin 4 antibodies were detectable in 67% (4/6) of patients with primary Sj?gren’s syndrome and in 60% (6/10) of patients without primary Sj?gren’s syndrome. More brain abnormalities were observed in patients without primary Sj?gren’s syndrome than in those with primary Sj?gren’s syndrome. Segments lesions (> 3 centrum) were noted in 50% (5/10) of patients without primary Sj?gren’s syndrome and in 67% (4/6) of patients with primary Sj?gren’s syndrome. Tese fndings indicate that the clinical characteristics of neuromyelitis optica spectrum disorder patients with and without primary Sj?gren’s syndrome are similar. However, neuromyelitis optica spectrum disorder patients without primary Sj?gren’s syndrome have a high frequency of brain abnormalities.
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    Adipose-derived stem cells enhance myogenic di?erentiation in the mdx mouse model of muscular dystrophy via paracrine signaling
    Ji-qing Cao, Ying-yin Liang, Ya-qin Li, Hui-li Zhang, Yu-ling Zhu, Jia Geng, Li-qing Yang, Shan-wei Feng, Juan Yang, Jie Kong, Cheng Zhang
    2016, 11 (10):  1638-1643.  doi: 10.4103/1673-5374.193244
    Abstract ( 254 )   PDF (916KB) ( 541 )   Save
    Adipose-derived stem cells have been shown to promote peripheral nerve regeneration through the paracrine secretion of neurotrophic factors. However, it is unclear whether these cells can promote myogenic di?erentiation in muscular dystrophy. Adipose-derived stem cells (6 × 106) were injected into the gastrocnemius muscle of mdx mice at various sites. Dystrophin expression was found in the muscle fbers. Phosphorylation levels of Akt, mammalian target of rapamycin (mTOR), eIF-4E binding protein 1 and S6 kinase 1 were increased, and the Akt/mTOR pathway was activated. Simultaneously, myogenin levels were increased, whereas cleaved caspase 3 and vimentin levels were decreased. Necrosis and fbrosis were reduced in the muscle fbers. Tese fndings suggest that adipose-derived stem cells promote the regeneration and survival of muscle cells by inhibiting apoptosis and fbrosis, thereby alleviating muscle damage in muscular dystrophy.
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    Preparation of polypyrrole-embedded electrospun poly(lactic acid) nanofbrous sca?olds for nerve tissue engineering
    Jun-feng Zhou, Yi-guo Wang, Liang Cheng, Zhao Wu, Xiao-dan Sun, Jiang Peng
    2016, 11 (10):  1644-1652.  doi: 10.4103/1673-5374.193245
    Abstract ( 416 )   PDF (3586KB) ( 775 )   Save
    Polypyrrole (PPy) is a biocompatible polymer with good conductivity. Studies combining PPy with electrospinning have been reported; however, the associated decrease in PPy conductivity has not yet been resolved. We embedded PPy into poly(lactic acid) (PLA) nanofbers via electrospinning and fabricated a PLA/PPy nanofbrous sca?old containing 15% PPy with sustained conductivity and aligned topography. Tere was good biocompatibility between the sca?old and human umbilical cord mesenchymal stem cells as well as Schwann cells. Additionally, the direction of cell elongation on the sca?old was parallel to the direction of fbers. Our fndings suggest that the aligned PLA/PPy nanofbrous sca?old is a promising biomaterial for peripheral nerve regeneration.
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    Pre-degenerated peripheral nerves co-cultured with bone marrow-derived cells: a new technique for harvesting high-purity Schwann cells
    Xiao-pan Wang, Min Wu, Jian-zhong Guan, Zhao-dong Wang, Xu-bin Gao, Yang-yang Liu
    2016, 11 (10):  1653-1659.  doi: 10.4103/1673-5374.193246
    Abstract ( 256 )   PDF (1918KB) ( 668 )   Save
    Schwann cells play an important role in the peripheral nervous system, especially in nerve repair following injury, so artifcial nerve regeneration requires an effective technique for obtaining purifed Schwann cells. In vivo and in vitro pre-degeneration of peripheral nerves have been shown to obtain high-purity Schwann cells. We believed that in vitro pre-degeneration was simple and controllable, and available for the clinic. Thus, we co-cultured the crushed sciatic nerves with bone marrow-derived cells in vitro. Results demonstrated that, 3 hours after injury, a large number of mononuclear cells moved to the crushed nerves and a large number of bone marrow-derived cells infltrated the nerve segments. These changes promoted the degradation of the nerve segments, and the dedifferentiation and proliferation of Schwann cells. Neural cell adhesion molecule and glial fbrillary acidic protein expression were detected in the crushed nerves. Schwann cell yield was 9.08 ± 2.01 × 104/mg. The purity of primary cultured Schwann cells was 88.4 ± 5.79%. These indicate a successful new method for obtaining Schwann cells of high purity and yield from adult crushed sciatic nerve using bone marrow-derived cells.
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    Boric acid reduces axonal and myelin damage in experimental sciatic nerve injury
    Zahir Kızılay, Haydar Ali Erken,Nesibe Kahraman Çetin, Serdar Aktaş, Burçin İrem Abas, Ali Yılmaz
    2016, 11 (10):  1660-1665.  doi: 10.4103/1673-5374.193247
    Abstract ( 167 )   PDF (2356KB) ( 301 )   Save
    Te aim of this study was to investigate the e?ects of boric acid in experimental acute sciatic nerve injury. Twenty-eight adult male rats were randomly divided into four equal groups (n = 7): control (C), boric acid (BA), sciatic nerve injury (I) , and sciatic nerve injury + boric acid treatment (BAI). Sciatic nerve injury was generated using a Yasargil aneurysm clip in the groups I and BAI. Boric acid was given four times at 100 mg/kg to rats in the groups BA and BAI afer injury (by gavage at 0, 24, 48 and 72 hours) but no injury was made in the group BA. In vivo electrophysiological tests were performed at the end of the day 4 and sciatic nerve tissue samples were taken for histopathological examination. The amplitude of compound action potential, the nerve conduction velocity and the number of axons were signifcantly lower and the myelin structure was found to be broken in group I compared with those in groups C and BA. However, the amplitude of the compound action potential, the nerve conduction velocity and the number of axons were signifcantly greater in group BAI than in group I. Moreover, myelin injury was signifcantly milder and the intensity of nuclear factor kappa B immunostaining was signifcantly weaker in group BAI than in group I. Te results of this study show that administration of boric acid at 100 mg/kg afer sciatic nerve injury in rats markedly reduces myelin and axonal injury and improves the electrophysiological function of injured sciatic nerve possibly through alleviating oxidative stress reactions.
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    Electrical stimulation promotes regeneration of injured oculomotor nerves in dogs
    Lei Du, Min Yang, Liang Wan, Xu-hui Wang, Shi-ting Li
    2016, 11 (10):  1666-1669.  doi: 10.4103/1673-5374.193248
    Abstract ( 316 )   PDF (574KB) ( 543 )   Save
    Functional recovery afer oculomotor nerve injury is very poor. Electrical stimulation has been shown to promote regeneration of injured nerves. We hypothesized that electrical stimulation would improve the functional recovery of injured oculomotor nerves. Oculomotor nerve injury models were created by crushing the right oculomotor nerves of adult dogs. Stimulating electrodes were positioned in both proximal and distal locations of the lesion, and non-continuous rectangular, biphasic current pulses (0.7 V, 5 Hz) were administered 1 hour daily for 2 consecutive weeks. Analysis of the results showed that electrophysiological and morphological recovery of the injured oculomotor nerve was enhanced, indicating that electrical stimulation improved neural regeneration. Tus, this therapy has the potential to promote the recovery of oculomotor nerve dysfunction.
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    Human amniotic epithelial cells combined with silk fbroin sca?old in the repair of spinal cord injury
    Ting-gang Wang, Jie Xu, Ai-hua Zhu, Hua Lu, Zong-ning Miao, Peng Zhao, Guo-zhen Hui, Wei-jiang Wu
    2016, 11 (10):  1670-1677.  doi: 10.4103/1673-5374.193249
    Abstract ( 261 )   PDF (1935KB) ( 415 )   Save
    Treatment and functional reconstruction afer central nervous system injury is a major medical and social challenge. An increasing number of researchers are attempting to use neural stem cells combined with artifcial sca?old materials, such as fbroin, for nerve repair. However, such approaches are challenged by ethical and practical issues. Amniotic tissue, a clinical waste product, is abundant, and amniotic epithelial cells are pluripotent, have low immunogenicity, and are not the subject of ethical debate. We hypothesized that amniotic epithelial cells combined with silk fbroin sca?olds would be conducive to the repair of spinal cord injury. To test this, we isolated and cultured amniotic epithelial cells, and constructed complexes of these cells and silk fbroin sca?olds. Implantation of the cell-sca?old complex into a rat model of spinal cord injury resulted in a smaller glial scar in the damaged cord tissue than in model rats that received a blank sca?old, or amniotic epithelial cells alone. In addition to a milder local immunological reaction, the rats showed less in?ammatory cell infltration at the transplant site, milder host-versus-graf reaction, and a marked improvement in motor function. Tese fndings confrm that the transplantation of amniotic epithelial cells combined with silk fbroin sca?old can promote the repair of spinal cord injury. Silk fbroin sca?old can provide a good nerve regeneration microenvironment for amniotic epithelial cells.
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    Combination of methylprednisolone and rosiglitazone promotes recovery of neurological function afer spinal cord injury
    Xi-gong Li, Xiang-jin Lin, Jun-hua Du, San-zhong Xu, Xian-feng Lou, Zhong Chen
    2016, 11 (10):  1678-1684.  doi: 10.4103/1673-5374.193250
    Abstract ( 228 )   PDF (890KB) ( 392 )   Save
    Methylprednisolone exhibits anti-in?ammatory antioxidant properties, and rosiglitazone acts as an anti-in?ammatory and antioxidant by activating peroxisome proliferator-activated receptor-γ in the spinal cord. Methylprednisolone and rosiglitazone have been clinically used during the early stages of secondary spinal cord injury. Because of the complexity and diversity of the in?ammatory process afer spinal cord injury, a single drug cannot completely inhibit in?ammation. Terefore, we assumed that a combination of methylprednisolone and rosiglitazone might promote recovery of neurological function afer secondary spinal cord injury. In this study, rats were intraperitoneally injected with methylprednisolone (30 mg/kg) and rosiglitazone (2 mg/kg) at 1 hour afer injury, and methylprednisolone (15 mg/kg) at 24 and 48 hours afer injury. Rosiglitazone was then administered once every 12 hours for 7 consecutive days. Our results demonstrated that a combined treatment with methylprednisolone and rosiglitazone had a more pronounced e?ect on attenuation of in?ammation and cell apoptosis, as well as increased functional recovery, compared with either single treatment alone, indicating that a combination better promoted recovery of neurological function afer injury.
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    Stem Cell Ophthalmology Treatment Study (SCOTS): bone marrow-derived stem cells in the treatment of Leber’s hereditary optic neuropathy
    Jeffrey N. Weiss, Steven Levy, Susan C. Benes
    2016, 11 (10):  1685-1694.  doi: 10.4103/1673-5374.193251
    Abstract ( 331 )   PDF (3466KB) ( 740 )   Save
    Te Stem Cell Ophthalmology Treatment Study (SCOTS) is currently the largest-scale stem cell ophthalmology trial registered at ClinicalTrials.gov (identifer: NCT01920867). SCOTS utilizes autologous bone marrow-derived stem cells (BMSCs) to treat optic nerve and retinal diseases. Treatment approaches include a combination of retrobulbar, subtenon, intravitreal, intra-optic nerve, subretinal, and intravenous injection of autologous BMSCs according to the nature of the disease, the degree of visual loss, and any risk factors related to the treatments. Patients with Leber’s hereditary optic neuropathy had visual acuity gains on the Early Treatment Diabetic Retinopathy Study (ETDRS) of up to 35 letters and Snellen acuity improvements from hand motion to 20/200 and from counting fngers to 20/100. Visual feld improvements were noted. Macular and optic nerve head nerve fber layer typically thickened. No serious complications were seen. Te increases in visual acuity obtained in our study were encouraging and suggest that the use of autologous BMSCs as provided in SCOTS for ophthalmologic mitochondrial diseases including Leber’s hereditary optic neuropathy may be a viable treatment option.
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