LT recebeu apoio concessão do Forschungsförderungsprogramm da Medicina da Universidade de Göttingen. PL e MB foram apoiados pelo Centro de Pesquisas DFG para Fisiologia Molecular do Cérebro (CMPB), Göttingen. Os autores agradecem ao Dr. Lars Tatenhorst de assistência com videografia e Liebau Birgit ajuda com áudio e edição de vídeo.

Os animais foram adquiridos a Jackson Laboratory (# 002,726) 1. Eles são clinicamente marcados e submetidos a um teste de função motora (rotarod teste) e da força muscular (pendurado teste do fio). Todos estes ensaios ea morte dos animais mais tarde, a fim de preparar a medula espinal foram realizados em conformidade muito perto das orientações locais para a conduta apropriada de experiências com animais. 1. Pontuação clínica Para além da avaliação para os ratos de peso corporal são examinados para sinais de déficit motor com o seguinte sistema de pontuação de 4 pontos 2: 4 pontos: normal (sem sinal de disfunção motora) 3 pontos: tremores nos membros posteriores são evidentes quando suspenso pela cauda 2 pontos: anormalidades da marcha estão presentes 1 ponto: arrastando de pelo menos um membro posterior 0 ponto: simétricoincapacidade paralisia, para a direita em si ou a perda de 20% do peso corporal máximo; neste caso, os animais são sacrificados imediatamente ea experiência é terminada 2. Testes da função motora e força muscular Pendurado fio Este teste é utilizado para avaliar a força muscular 3, 4. Todos os animais realizar este teste, pelo menos, um ou dois dias após o teste de rotarod. Cada rato é colocado em uma tampa de arame sob medida com intervalos de 0,8 cm e cautelosamente virou de cabeça para baixo, 60 cm acima de um fundo de palha coberto. Após a formação por três vezes consecutivas de pelo menos 180 s a latência para cair é medido. Cada rato é dada até três tentativas para segurar a tampa invertida para um máximo de 180 S e no período mais longo é gravado. Rotarod Teste 3, 4. Um bom desempenho requer um elevado grau de coordenação sensório. A máquina deve ser colocado em um ambiente calmo e não-perturbador para evitar estímulos de interferências para o animal testado. É constituída por uma controlado por computador do fuso motorizado rotativo e cinco pistas durante cinco ratinhos. Quedas dos ratinhos são detectados automaticamente pela pressão sobre uma placa de plástico na parte inferior. Após a formação por três vezes consecutivas de pelo menos 180 S a uma velocidade constante de 15 rpm, o tempo para o qual um animal pode permanecer sobre a haste rotativa é medido. Cada animal passa por três provas e mais longa latência, sem cair é gravado. O tempo de 180 s é escolhido como cut-off tempo, porque a maioria das diferenças significativas na coordenação motora são detectados neste espaço de tempo. 3. Preparação da Medula Espinhal <ol class="lalpha"><li> Os animais são mortos por insuflação de CO 2, de acordo com as orientações locais e são imediatamente perfundido transcardially com solução de PBS, seguido por uma solução de paraformaldeído a 4%. </li><li> A fim de preparar a medula espinal do rato sacrificados, o animal é colocado sobre uma mesa de operação e os quatro membros são fixados no lado, a fim de expor o lado de trás do rato. </li><li> Um curto da lavagem com uma solução de etanol a 70% limpa o local de dissecção e achata a pêlo. </li><li> Em seguida, a pele é incisão com um bisturi afiado na linha mediana. A fim de facilitar o corte da pele é esticada para ambos os lados. Se os músculos das pernas devem ser preparadas, sua pele também tem de ser feita uma incisão. </li><li> Após a incisão na pele é completado, é puxado para o lado com um par de pinças para expor a fáscia superficial do corpo. </li><li> A musculatura do pescoço e do ligamento nucal tem que ser removido e são carefully preparado. Tenha cuidado para não incisar a profundamente e lesão na medula espinhal. Os músculos do ombro também pode ser removido de modo a melhor expor a coluna vertebral. </li><li> Em seguida, os músculos paravertebrais são removidos a partir de toda a coluna vertebral. </li><li> A fim de abrir os laminectomias da coluna vertebral vários têm de ser realizados. Deve-se começar a partir da parte superior do crânio no local da articulação atlanto-occipital. </li><li> É mais fácil remover a fixação dos dois membros superiores e esticar o pescoço para ser mais capazes de realizar a laminectomia das vértebras primeiro. Estes são afastou sem tocar o exposto medula espinhal cervical. </li><li> Mais vértebras são removidos por primeiro rasguem a arcos vertebrais em ambos os lados com uma tesoura em ângulo e, em seguida, puxando os processos dorsal. Restantes partes laterais das vértebras devem ser removidos para facilitar a posterior remoção completa da medula espinhal. </li><li> Um marco anatômico da espinha lombarl é o cabo de intumescência que também está presente na medula cervical. </li><li> Tendo terminado a laminectomia de toda a medula espinhal, certifique-se que você também transect todas as raízes ventrais e liberar a medula espinhal a partir da dura-máter das meninges. </li><li> Em seguida, a medula espinhal cervical cranial é cortado e você começa a remover a medula espinhal. </li><li> Finalmente, a medula espinhal é também cortado na cauda distal-eqüina para ser completamente liberado. </li><li> Em última análise, a medula espinal é colocado dentro de uma solução postfixating (por exemplo, paraformaldeído a 4%) durante a noite e podem ser posteriormente tratados. Nós geralmente cryosection da medula espinhal para prepará-lo para análise imuno. </li></ol> 4. Os resultados representativos A técnica de preparação da medula espinal representa o foco deste artigo de vídeo. É um pré-requisito essencial para o seccionamento de tecidos mais tarde e, finalmente, para análise imuno de espinhaCabo seções l. Como um exemplo de um resultado final, um workup imuno-histoquímica da região corno anterior do rato medula espinal lombar de um tipo selvagem (wt) e de um SOD G93A transgene (TG) do rato é demonstrada. Neurónios motores pode ser identificado com um anticorpo anti-ChAT primária e subsequente marcação fluorescente com um anticorpo secundário Cy3. Além disso, um nuclear contra-mancha com DAPI (4,6-diamidino-2-fenilindol) foi realizada (Figura 1). <img src="/files/ftp_upload/3936/3936fig1.jpg" alt="A Figura 1" /> Figura 1. Fotomicrografias fluorescentes visualizando a imunodetecção de motoneurónios com anticorpo anti-ChAT (vermelho) e núcleos celulares contra-mancha por DAPI (azul) no corno cabo de rato vertebral lombar anterior de um tipo selvagem (wt) (à esquerda) e do um SOD G93A transgênicos (TG) (à direita) do mouse com a idade de 130 dias. Barra de escala: 40 mM. Como a análise imuno-histoquímica deos ratinhos de SOD G93A não é o âmbito primário deste artigo consultar a publicação original em que estes ratinhos transgénicos foram caracterizados e os mais recentes que estudam abordagens terapêuticas para referência futura 1, 5, 6. Se os efeitos terapêuticos deve ser diferenciado do nível imuno claramente definida algoritmos de avaliação quantitativa deve ser aplicada suportado por um software estereológica (por exemplo ver 7).

<ol>
	<li>Gurney, M. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Motor+neuron+degeneration+in+mice+that+express+a+human+Cu,+Zn+superoxide+dismutase+mutation.">Motor neuron degeneration in mice that express a human Cu, Zn superoxide dismutase mutation.</a> Science. 264 (5166), 1772-1775 (1994).</li><li>Weydt, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Assessing+disease+onset+and+progression+in+the+SOD1+mouse+model+of+ALS.">Assessing disease onset and progression in the SOD1 mouse model of ALS.</a> Neuroreport. 14 (7), 1051-1054 (2003).</li><li>Crawley, J. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Behavioral+phenotyping+strategies+for+mutant+mice.">Behavioral phenotyping strategies for mutant mice.</a> Neuron. 57 (6), 809-818 (2008).</li><li>Miana-Mena, F. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Optimal+methods+to+characterize+the+G93A+mouse+model+of+ALS.">Optimal methods to characterize the G93A mouse model of ALS.</a> Amyotroph. Lateral Scler. Other Motor Neuron Disord. 6 (1), 55-62 (2005).</li><li>Zhong, Z. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Activated+protein+C+therapy+slows+ALS&#45;like+disease+in+mice+by+transcriptionally+inhibiting+SOD1+in+motor+neurons+and+microglia+cells.">Activated protein C therapy slows ALS&#45;like disease in mice by transcriptionally inhibiting SOD1 in motor neurons and microglia cells.</a> J. Clin. Invest. 119 (11), 3437-3449 (2009).</li><li>Pitzer, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Granulocyte&#45;colony+stimulating+factor+improves+outcome+in+a+mouse+model+of+amyotrophic+lateral+sclerosis.">Granulocyte&#45;colony stimulating factor improves outcome in a mouse model of amyotrophic lateral sclerosis.</a> Brain. 131 (Pt. 12), 3335-3347 (2008).</li><li>Gowing, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ablation+of+proliferating+microglia+does+not+affect+motor+neuron+degeneration+in+amyotrophic+lateral+sclerosis+caused+by+mutant+superoxide+dismutase.">Ablation of proliferating microglia does not affect motor neuron degeneration in amyotrophic lateral sclerosis caused by mutant superoxide dismutase.</a> J. Neurosci. 28 (41), 10234-10244 (2008).</li><li>Scott, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=interpretation+of+studies+in+the+standard+murine+model+of+ALS.">interpretation of studies in the standard murine model of ALS.</a> Amyotroph Lateral Scler. 9 (1), 4-15 (2008).</li><li>Turner, B. J., Talbot, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Transgenics,+toxicity+and+therapeutics+in+rodent+models+of+mutant+SOD1&#45;mediated+familial+ALS.">Transgenics, toxicity and therapeutics in rodent models of mutant SOD1&#45;mediated familial ALS.</a> Prog Neurobiol. 85 (1), 94-134 (2008).</li><li>Corse, A. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Preclinical+testing+of+neuroprotective+neurotrophic+factors+in+a+model+of+chronic+motor+neuron+degeneration.">Preclinical testing of neuroprotective neurotrophic factors in a model of chronic motor neuron degeneration.</a> Neurobiol Dis. 6 (5), 335-346 (1999).</li><li>Knippenberg, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Significance+of+behavioural+tests+in+a+transgenic+mouse+model+of+amyotrophic+lateral+sclerosis+&#40;ALS&#41;.">Significance of behavioural tests in a transgenic mouse model of amyotrophic lateral sclerosis &#40;ALS&#41;.</a> Behav Brain Res. 213 (1), 82-87 (2010).</li><li>Burgess, R. W., Cox, G. A., Seburn, K. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neuromuscular+disease+models+and+analysis.">Neuromuscular disease models and analysis.</a> Methods Mol. Biol. 602, 347-393 (2010).</li><li>Hayworth, C. R., Gonzalez-Lima, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pre-symptomatic+detection+of+chronic+motor+deficits+and+genotype+prediction+in+congenic+B6.SOD1(G93A)+ALS+mouse+model.">Pre-symptomatic detection of chronic motor deficits and genotype prediction in congenic B6.SOD1(G93A) ALS mouse model.</a> Neuroscience. 164 (3), 975-985 (2009).</li><li>Ludolph, A. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Guidelines+for+preclinical+animal+research+in+ALS&#47;MND:+A+consensus+meeting.">Guidelines for preclinical animal research in ALS&#47;MND: A consensus meeting.</a> Amyotroph Lateral Scler. 11 (1-2), 38-45 (2010).</li><li>Boillee, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Onset+and+progression+in+inherited+ALS+determined+by+motor+neurons+and+microglia.">Onset and progression in inherited ALS determined by motor neurons and microglia.</a> Science. 5778 (3), 1389-1392 (2006).</li></ol>

Não há conflitos de interesse declarados.

A SOD1 (G93A) modelo do rato genético é um valioso modelo animal para estudar o curso da doença de perda progressiva dos motoneurônios comparável à esclerose amiotrófica lateral, humano 8. Uma variedade de paradigmas de tratamento diferentes foram avaliados neste modelo e representam uma base para posterior teste em humanos 8-10 estudos clínicos. A fim de ser capaz de detectar diferenças significativas em um estudo de tratamento experimental nestes ratinhos, é de importância primordial p...

<table border="1"><tbody><tr><td></td><td> Fabricante </td><td> Informações para pedidos </td></tr><tr><td> Testes comportamentais </td><td></td><td></td></tr><tr><td> Rota-Rod para Ratos </td><td> Ugo Basile, Comerio, Itália </td><td> # 47600 </td></tr><tr><td> Pendurado dispositivo fio </td><td> Feito sob encomenda </td><td></td></tr><tr><td colspan="3"></td></tr><tr><td> Preparação da Medula Espinhal </td><td></td><td></td></tr><tr><td> Tabela Operação A luz de funcionamento Luvas de protecção </td><td></td><td></td></tr><tr><td> &quot;Iris&quot; Tesoura, angulado a lado </td><td> Belas Ferramentas ciência, Heidelberg, Alemanha </td><td> 14063-09 </td></tr><tr><td> Cohan-Vannas Tesoura Primavera, em linha reta </td><td> Belas Ferramentas ciência, Heidelberg, Alemanha </td><td> 15000-10 </td&gt; </tr><tr><td> Micro pinça </td><td> Hammacher, Solingen, Alemanha </td><td> HWC 111-10 </td></tr><tr><td> Bisturi &quot;präzisa plus&quot; </td><td> Dahlhausen, Köln, Alemanha </td><td> 11.000.00.510, a FIG 10 </td></tr></tbody></table>

clinical testing and spinal cord removal in a mouse model for amyotrophic lateral sclerosis (als)

Esclerose lateral amiotrófica (ELA) é uma desordem neurodegenerativa fatal resultando em degeneração progressiva dos motoneurónios. Pico de início é em torno de 60 anos para a doença esporádica e em torno de 50 anos para a doença familiar. Devido ao seu curso progressivo, 50% dos pacientes morrem dentro de 30 meses de início dos sintomas. A fim de avaliar as opções de novo tratamento para esta doença, os modelos murinos genéticos de ALS foram gerados com base em humanos mutações da família no gene SOD, tais como a mutação SOD1 (G93A). Aspectos mais importantes que têm de ser avaliados no modelo são em geral curso de sobrevivência, clínica e da função motora. Aqui, demonstramos a avaliação clínica, mostram a realização de dois testes motores comportamentais e fornecer sistemas de pontuação para todos os parâmetros quantitativos. Porque uma análise em profundidade do modelo de mouse ALS normalmente exige um exame imunohistoquímico da medula espinhal, que demonstram a sua preparação em detalhe a aplicação do fazermétodo laminectomia Rsal. Exemplares achados histológicos são demonstrados. A aplicação integral dos métodos de exame descritas em estudos sobre o modelo do rato de ALS permitirá ao pesquisador confiável testar futuras opções terapêuticas que podem fornecer uma base para mais tarde ensaios clínicos humanos.

Watch this Scientific Journal Video about Clinical Testing and Spinal Cord Removal in a Mouse Model for Amyotrophic Lateral Sclerosis ALS at JoVE.com

Clinical Testing and Spinal Cord Removal in a Mouse Model for Amyotrophic Lateral Sclerosis ALS

Um modelo do rato para a esclerose lateral amiotrófica (ELA) é examinado clinicamente e comportamentalmente. Como um pré-requisito para uma análise imuno acompanha a preparação da medula espinal é descrito em detalhe.

Testes clínicos e Remoção da Medula Espinhal em um modelo do rato para a Esclerose Lateral Amiotrófica (ELA)

Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disorder resulting in progressive degeneration of motoneurons. Peak of onset is around 60 ...

clinical-testing-spinal-cord-removal-mouse-model-for-amyotrophic

Research

JoVE Journal

Medicine

Clinical Testing and Spinal Cord Removal in a Mouse Model for Amyotrophic Lateral Sclerosis (ALS)

27.9K visualizações.  University Medicine Göttingen. Um modelo do rato para a esclerose lateral amiotrófica (ELA) é examinado clinicamente e comportamentalmente. Como um pré-requisito para uma análise imuno acompanha a preparação da medula espinal é descrito em detalhe.

Vídeo: Clinical Testing and Spinal Cord Removal in a Mouse Model for Amyotrophic Lateral Sclerosis ALS

A Protocol for Comprehensive Assessment of Bulbar Dysfunction in Amyotrophic Lateral Sclerosis (ALS)

Improved methods for assessing bulbar impairment are necessary for expediting diagnosis of bulbar dysfunction in ALS, for predicting disease progression across speech subsystems, and for addressing the critical need for sensitive outcome measures for ongoing experimental treatment trials. To address this need, we are obtaining longitudinal profiles of bulbar impairment in 100 individuals based on a comprehensive instrumentation-based assessment that yield objective measures. Using instrumental approaches to quantify speech-related behaviors is very important in a field that has primarily relied on subjective, auditory-perceptual forms of speech assessment1. Our assessment protocol measures performance across all of the speech subsystems, which include respiratory, phonatory (laryngeal), resonatory (velopharyngeal), and articulatory. The articulatory subsystem is divided into the facial components (jaw and lip), and the tongue. Prior research has suggested that each speech subsystem responds differently to neurological diseases such as ALS. The current protocol is designed to test the performance of each speech subsystem as independently from other subsystems as possible. The speech subsystems are evaluated in the context of more global changes to speech performance. These speech system level variables include speaking rate and intelligibility of speech.
The protocol requires specialized instrumentation, and commercial and custom software. The respiratory, phonatory, and resonatory subsystems are evaluated using pressure-flow (aerodynamic) and acoustic methods. The articulatory subsystem is assessed using 3D motion tracking techniques. The objective measures that are used to quantify bulbar impairment have been well established in the speech literature and show sensitivity to changes in bulbar function with disease progression. The result of the assessment is a comprehensive, across-subsystem performance profile for each participant. The profile, when compared to the same measures obtained from healthy controls, is used for diagnostic purposes. Currently, we are testing the sensitivity and specificity of these measures for diagnosis of ALS and for predicting the rate of disease progression. In the long term, the more refined endophenotype of bulbar ALS derived from this work is expected to strengthen future efforts to identify the genetic loci of ALS and improve diagnostic and treatment specificity of the disease as a whole. The objective assessment that is demonstrated in this video may be used to assess a broad range of speech motor impairments, including those related to stroke, traumatic brain injury, multiple sclerosis, and Parkinson disease.

A Protocol for Comprehensive Assessment of Bulbar Dysfunction in Amyotrophic Lateral Sclerosis ALS

Objective assessments of the physiological mechanisms that support speech are needed to monitor disease onset and progression in persons with ALS and to quantify treatment effects in clinical trials. In this video, we present a comprehensive, instrumentation-based protocol for quantifying speech motor performance in clinical populations.

Um Protocolo de Avaliação Abrangente de Disfunção Bulbar em Esclerose Lateral Amiotrófica (ALS)

Improved methods for assessing bulbar impairment are necessary for expediting diagnosis of bulbar dysfunction in ALS, for predicting disease progression ...

Medicina

Intraspinal Cell Transplantation for Targeting Cervical Ventral Horn in Amyotrophic Lateral Sclerosis and Traumatic Spinal Cord Injury

Respiratory compromise due to phrenic motor neuron loss is a debilitating consequence of a large proportion of human traumatic spinal cord injury (SCI) cases 1 and is the ultimate cause of death in patients with the motor neuron disorder, amyotrophic laterals sclerosis (ALS) 2.
ALS is a devastating neurological disorder that is characterized by relatively rapid degeneration of upper and lower motor neurons. Patients ultimately succumb to the disease on average 2-5 years following diagnosis because of respiratory paralysis due to loss of phrenic motor neuron innnervation of the diaphragm 3. The vast majority of cases are sporadic, while 10% are of the familial form. Approximately twenty percent of familial cases are linked to various point mutations in the Cu/Zn superoxide dismutase 1 (SOD1) gene on chromosome 21 4. Transgenic mice 4,5 and rats 6 carrying mutant human SOD1 genes (G93A, G37R, G86R, G85R) have been generated, and, despite the existence of other animal models of motor neuron loss, are currently the most highly used models of the disease.
Spinal cord injury (SCI) is a heterogeneous set of conditions resulting from physical trauma to the spinal cord, with functional outcome varying according to the type, location and severity of the injury 7. Nevertheless, approximately half of human SCI cases affect cervical regions, resulting in debilitating respiratory dysfunction due to phrenic motor neuron loss and injury to descending bulbospinal respiratory axons 1. A number of animal models of SCI have been developed, with the most commonly used and clinically-relevant being the contusion 8.
Transplantation of various classes of neural precursor cells (NPCs) is a promising therapeutic strategy for treatment of traumatic CNS injuries and neurodegeneration, including ALS and SCI, because of the ability to replace lost or dysfunctional CNS cell types, provide neuroprotection, and deliver gene factors of interest 9.
Animal models of both ALS and SCI can model many clinically-relevant aspects of these diseases, including phrenic motor neuron loss and consequent respiratory compromise 10,11. In order to evaluate the efficacy of NPC-based strategies on respiratory function in these animal models of ALS and SCI, cellular interventions must be specifically directed to regions containing therapeutically relevant targets such as phrenic motor neurons. We provide a detailed protocol for multi-segmental, intraspinal transplantation of NPCs into the cervical spinal cord ventral gray matter of neurodegenerative models such as SOD1G93A mice and rats, as well as spinal cord injured rats and mice 11.

Neural precursor transplantation is a promising strategy for protecting and/or replacing lost/dysfunctional cervical phrenic motor neurons in spinal cord injury (SCI) and the motor neuron disorder, amyotrophic laterals sclerosis (ALS). We provide a protocol for cell delivery to cervical spinal cord ventral horn in rodent models of ALS and SCI.

Intra Transplante de Células de Segmentação Chifre Cervical Ventral em Esclerose Lateral Amiotrófica e lesão medular traumática

Respiratory compromise due to phrenic motor neuron loss is a debilitating consequence of a large proportion of human traumatic spinal cord injury (SCI) ...

Acute and Chronic Tactile Sensory Testing after Spinal Cord Injury in Rats

Spinal cord injury (SCI) impairs sensory systems causing allodynia1-8. To identify cellular and molecular causes of allodynia, sensitive and valid sensory testing in rat SCI models is needed. However, until recently, no single testing approach had been validated for SCI so that standardized methods have not been implemented across labs. Additionally, available testing methods could not be implemented acutely or when severe motor impairments existed, preventing studies of the development of SCI-induced allodynia3. Here we present two validated sensory testing methods using von Frey Hair (VFH) monofilaments which quantify changes in tactile sensory thresholds after SCI4-5. One test is the well-established Up-Down test which demonstrates high sensitivity and specificity across different SCI severities when tested chronically5. The other test is a newly-developed dorsal VFH test that can be applied acutely after SCI when allodynia develops, prior to motor recovery4-5. Each VFH monofilament applies a calibrated force when touched to the skin of the hind paw until it bends. In the up-down method, alternating VFHs of higher or lower forces are used on the plantar L5 dermatome to delineate flexor withdrawal thresholds. Successively higher forces are applied until withdrawal occurs then lower force VFHs are used until withdrawal ceases. The tactile threshold reflects the force required to elicit withdrawal in 50% of the stimuli. For the new test, each VFH is applied to the dorsal L5 dermatome of the paw while the rat is supported by the examiner. The VFH stimulation occurs in ascending order of force until at least 2 of 3 applications at a given force produces paw withdrawal. Tactile sensory threshold is the lowest force to elicit withdrawal 66% of the time. Acclimation, testing and scoring procedures are described. Aberrant trials that require a retest and typical trials are defined. Animal use was approved by Ohio State University Animal Care and Use Committee.

We describe two tactile sensory testing methods for acute or chronic periods of spinal cord injury in rats. These validated procedures can detect the development and maintenance of allodynia-like sensations.

Aguda e crônica teste sensorial tátil após a lesão medular em ratos

Spinal cord injury (SCI) impairs sensory systems causing allodynia1-8. To identify cellular and molecular causes of allodynia, sensitive and valid sensory ...

A Contusion Model of Severe Spinal Cord Injury in Rats

The translational potential of novel treatments should be investigated in severe spinal cord injury (SCI) contusion models. A detailed methodology is described to obtain a consistent model of severe SCI. Use of a stereotactic frame and computer controlled impactor allows for creation of reproducible injury. Hypothermia and urinary tract infection pose significant challenges in the post-operative period. Careful monitoring of animals with daily weight recording and bladder expression allows for early detection of post-operative complications. The functional results of this contusion model are equivalent to transection models. The contusion model can be utilized to evaluate the efficacy of both neuroprotective and neuroregenerative approaches.

A contusion model of severe spinal cord injury is described. Detailed pre-operative, operative and post-operative steps are described to obtain a consistent model.

Um modelo de contusão grave de lesão medular em ratos

The translational potential of novel treatments should be investigated in severe spinal cord injury (SCI) contusion models. A detailed methodology is ...

Utility of Dissociated Intrinsic Hand Muscle Atrophy in the Diagnosis of Amyotrophic Lateral Sclerosis

The split hand phenomenon refers to predominant wasting of thenar muscles and is an early and specific feature of amyotrophic lateral sclerosis (ALS). A novel split hand index (SI) was developed to quantify the split hand phenomenon, and its diagnostic utility was assessed in ALS patients. The split hand index was derived by dividing the product of the compound muscle action potential (CMAP) amplitude recorded over the abductor pollicis brevis and first dorsal interosseous muscles by the CMAP amplitude recorded over the abductor digiti minimi muscle. In order to assess the diagnostic utility of the split hand index, ALS patients were prospectively assessed and their results were compared to neuromuscular disorder patients. The split hand index was significantly reduced in ALS when compared to neuromuscular disorder patients (P&#60;0.0001). Limb-onset ALS patients exhibited the greatest reduction in the split&#160;hand index, and a value of 5.2 or less reliably differentiated ALS from other neuromuscular disorders. Consequently, the split&#160;hand index appears to be a novel diagnostic biomarker for ALS, perhaps facilitating an earlier diagnosis.

Dissociated atrophy of intrinsic hand muscles, termed the split hand, appears to be a specific feature of amyotrophic lateral sclerosis (ALS).&#160;Consequently, a novel neurodiagnostic test, termed the split hand&#160;index, was developed to quantify the clinical phenomenon of the split hand, which differentiated ALS from mimic disorders.

Utilitário de Dissociated Intrínseca Mão atrofia muscular no Diagnóstico de Esclerose Lateral Amiotrófica

The split hand phenomenon refers to predominant wasting of thenar muscles and is an early and specific feature of amyotrophic lateral sclerosis (ALS). A ...

Controlled Cortical Impact Model for Traumatic Brain Injury

Every year over a million Americans suffer a traumatic brain injury (TBI). Combined with the incidence of TBIs worldwide, the physical, emotional, social, and economical effects are staggering. Therefore, further research into the effects of TBI and effective treatments is necessary. The controlled cortical impact (CCI) model induces traumatic brain injuries ranging from mild to severe. This method uses a rigid impactor to deliver mechanical energy to an intact dura exposed following a craniectomy. Impact is made under precise parameters at a set velocity to achieve a pre-determined deformation depth. Although other TBI models, such as weight drop and fluid percussion, exist, CCI is more accurate, easier to control, and most importantly, produces traumatic brain injuries similar to those seen in humans. However, no TBI model is currently able to reproduce pathological changes identical to those seen in human patients. The CCI model allows investigation into the short-term and long-term effects of TBI, such as neuronal death, memory deficits, and cerebral edema, as well as potential therapeutic treatments for TBI.

Traumatic brain injuries (TBIs) remain a serious health problem. Using the controlled cortical impact surgery model, research on the effects of TBI and possible treatment methods may be performed.

Controlado Modelo Impact Cortical para lesão cerebral traumática

Every year over a million Americans suffer a traumatic brain injury (TBI).  Combined with the incidence of TBIs worldwide, the physical, emotional, ...

A Radio-telemetric System to Monitor Cardiovascular Function in Rats with Spinal Cord Transection and Embryonic Neural Stem Cell Grafts

High thoracic or cervical spinal cord injury (SCI) can lead to cardiovascular dysfunction. To monitor cardiovascular parameters, we implanted a catheter connected to a radio transmitter into the femoral artery of rats that underwent a T4 spinal cord transection with or without grafting of embryonic brainstem-derived neural stem cells expressing green fluorescent protein. Compared to other methods such as cannula insertion or tail-cuff, telemetry is advantageous to continuously monitor blood pressure and heart rate in freely moving animals. It is also capable of long term multiple data acquisitions. In spinal cord injured rats, basal cardiovascular data under unrestrained condition and autonomic dysreflexia in response to colorectal distension were successfully recorded. In addition, cardiovascular parameters before and after SCI can be compared in the same rat if a transmitter is implanted before a spinal cord transection. One limitation of the described telemetry procedure is that implantation in the femoral artery may influence the blood supply to the ipsilateral hindlimb.

We present a protocol for using a radio-telemetric system to record cardiovascular parameters in T4 spinal cord transected rats eight weeks after embryonic brainstem neural stem cell grafting into the lesion site. Telemetry is an advanced technique to accurately evaluate cardiovascular function in conscious freely moving spinal cord injured rats.

Um sistema de rádio-telemetria para monitorar a função cardiovascular em ratos com Medula Espinhal transecção e Embryonic Stem Neural enxertos de células-

High thoracic or cervical spinal cord injury (SCI) can lead to cardiovascular dysfunction. To monitor cardiovascular parameters, we implanted a catheter ...

Calibrated Forceps Model of Spinal Cord Compression Injury

Compression injuries of the murine spinal cord are valuable animal models for the study of spinal cord injury (SCI) and spinal regenerative therapy. The calibrated forceps model of compression injury is a convenient, low cost, and very reproducible animal model for SCI. We used a pair of modified forceps in accordance with the method published by Plemel et al. (2008) to laterally compress the spinal cord to a distance of 0.35 mm. In this video, we will demonstrate a dorsal laminectomy to expose the spinal cord, followed by compression of the spinal cord with the modified forceps. In the video, we will also address issues related to the care of paraplegic laboratory animals. This injury model produces mice that exhibit impairment in sensation, as well as impaired hindlimb locomotor function. Furthermore, this method of injury produces consistent aberrations in the pathology of the SCI, as determined by immunohistochemical methods. After watching this video, viewers should be able to determine the necessary supplies and methods for producing SCI of various severities in the mouse for studies on SCI and/or treatments designed to mitigate impairment after injury.

Spinal cord injury models should be highly reproducible. We demonstrate that the calibrated forceps compression model of spinal cord injury is an easy to use surgical method for generating reproducible injuries to the murine spinal cord.

Calibrado Fórceps Modelo de Lesão Medular Compression

Compression injuries of the murine spinal cord are valuable animal models for the study of spinal cord injury (SCI) and spinal regenerative therapy. The ...

A Quick Phenotypic Neurological Scoring System for Evaluating Disease Progression in the SOD1-G93A Mouse Model of ALS

The SOD1-G93A transgenic mouse is the most widely used animal model of amyotrophic lateral sclerosis (ALS). At ALS TDI we developed a phenotypic screening protocol, demonstrated in video herein, which reliably assesses the neuromuscular function of SOD1-G93A mice in a quick manner. This protocol encompasses a simple neurological scoring system (NeuroScore) designed to assess hindlimb function. NeuroScore is focused on hindlimb function because hindlimb deficits are the earliest reported neurological sign of disease in SOD1-G93A mice. The protocol developed by ALS TDI provides an unbiased assessment of onset of paresis (slight or partial paralysis), progression and severity of paralysis and it is sensitive enough to identify drug-induced changes in disease progression. In this report, the combination of a detailed manuscript with video minimizes scoring ambiguities and inter-experimenter variability thus allowing for the protocol to be adopted by other laboratories and enabling comparisons between studies taking place at different settings. We believe that this video protocol can serve as an excellent training tool for present and future ALS researchers.

This video protocol describes a sensitive, reliable, and quick method for evaluating the neuromuscular deficits in a transgenic mouse model of amyotrophic lateral sclerosis.

Um sistema de pontuação neurológica rápida fenotípica para a Avaliação de progressão da doença na SOD1 G93A-Rato modelo de ALS

The SOD1-G93A transgenic mouse is the most widely used animal model of amyotrophic lateral sclerosis (ALS). At ALS TDI we developed a phenotypic screening ...

A Neonatal Mouse Spinal Cord Compression Injury Model

Spinal cord injury (SCI) typically causes devastating neurological deficits, particularly through damage to fibers descending from the brain to the spinal cord. A major current area of research is focused on the mechanisms of adaptive plasticity that underlie spontaneous or induced functional recovery following SCI. Spontaneous functional recovery is reported to be greater early in life, raising interesting questions about how adaptive plasticity changes as the spinal cord develops. To facilitate investigation of this dynamic, we have developed a SCI model in the neonatal mouse. The model has relevance for pediatric SCI, which is too little studied. Because neural plasticity in the adult involves some of the same mechanisms as neural plasticity in early life1, this model may potentially have some relevance also for adult SCI. Here we describe the entire procedure for generating a reproducible spinal cord compression (SCC) injury in the neonatal mouse as early as postnatal (P) day 1. SCC is achieved by performing a laminectomy at a given spinal level (here described at thoracic levels 9-11) and then using a modified Yasargil aneurysm mini-clip to rapidly compress and decompress the spinal cord. As previously described, the injured neonatal mice can be tested for behavioral deficits or sacrificed for ex vivo physiological analysis of synaptic connectivity using electrophysiological and high-throughput optical recording techniques1. Earlier and ongoing studies using behavioral and physiological assessment have demonstrated a dramatic, acute impairment of hindlimb motility followed by a complete functional recovery within 2 weeks, and the first evidence of changes in functional circuitry at the level of identified descending synaptic connections1.

This article describes a method for generating a reproducible spinal cord compression injury (SCI) in the neonatal mouse. The model provides an advantageous platform for studying mechanisms of adaptive plasticity that underlie spontaneous functional recovery.

A Neonatal do rato Spinal Cord Injury Compression Modelo

Spinal cord injury (SCI) typically causes devastating neurological deficits, particularly through damage to fibers descending from the brain to the spinal ...