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‣ Influência da irradiação do laser na regeneração nervosa em diferentes locais de tratamento; Influence of laser radiation in nerve regeneration in different treatment sites

SOUSA, Fausto Fernandes de Almeida; ANDRAUS, Rodrigo Antônio Carvalho; BARBIERI, Cláudio Henrique; MAZZER, Nilton
Fonte: Atha Comunicação & Editora Publicador: Atha Comunicação & Editora
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
67.842847%
OBJETIVO: Verificar a influência do laser de baixa intensidade de AsGaAl na lesão por esmagamento do nervo peroneiro de ratos através da avaliação funcional da marcha nos diferentes locais de irradiação. MÉTODOS: Foram utilizados 53 ratos, divididos em seis grupos: normal, lesado não tratado, lesado e tratado placebo, lesado e tratado na medula, lesado e tratado no nervo, lesado e tratado em ambos (nervo e medula). O esmagamento do nervo peroneiro foi realizado por meio de uma pinça e subsequente tratado com laser por 28 dias consecutivos. Na avaliação funcional foram analisadas as impressões das pegadas, registradas pela câmera de vídeo em uma passarela de acrílico, no pré-operatório e aos 14º, 21º e 28º dias de pós-operatório, e avaliadas na fórmula PFI por meio do software. RESULTADOS: Na avaliação funcional da marcha foram encontradas diferenças significantes somente no 14º dia de pós-operatório. CONCLUSÃO: A irradiação do laser AsGaAl de baixa intensidade foi capaz de acelerar e potencializar o processo de regeneração nervosa periférica de ratos no 14º dia de pós-operatório, de acordo com a avaliação funcional da marcha, tanto para o grupo tratado na medula quanto para o grupo tratado no nervo.; OBJECTIVE: This study seeks to determine...

‣ Influência da imunossupressão na regeneração nervosa com utilização de aloenxertos: Estudo experimental em ratos; Influence of immunosupression on nerve regeneration using allografts: an experimental study on rats

TUMA JÚNIOR, Paulo; FERREIRA, Marcus Castro; NAKAMOTO, Hugo Alberto; MILCHESKI, Dimas André; CHEROTO FILHO, Aylton
Fonte: Atha Comunicação & Editora Publicador: Atha Comunicação & Editora
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
67.986875%
A enxertia alógena de nervo teve seu interesse renovado após o desenvolvimento de melhores drogas imunossupressoras. Neste trabalho estudou-se a enxertia alógena de nervo utilizando a técnica de planimetria por contagem de pontos.Foram considerados três grupos: Grupo A - ratos Lewis que receberam enxertos de nervo de doadores isogênicos; Grupo B - ratos Lewis que receberam enxertos de nervo de ratos doadores Brown-Norway e foram tratados com solução salina; Grupo C - ratos Lewis que receberam enxertos de nervo de ratos doadores Brown-Norway e foram tratados com ciclosporina. A regeneração neural foi avaliada por análise histológica e estudos histomorfométricos depois de 6 e 12 semanas. Com 6 semanas, a densidade de fibras neurais e a porcentagem de tecido neural no grupo de enxertos alógenos com imunossupressão (grupo C) era significativamente mais alta do que no grupo B. Os grupos de enxertos alógenos (grupo B e C) mostraram densidade menor de fibras de nervo e porcentagem de tecido neural que no grupo de enxerto autógeno (grupo A) tanto com 6 quanto com 12 semanas.O método de planimetria por contagem de pontos produziu resultados precisos e reprodutíveis.; PURPOSE: This paper was aimed to study nerve regeneration after allografting using conventional point counting technique. INTRODUCTION:The interest towards nerve allografting has been growing since the recent development of better immunosuppressant drugs. METHODS: Three groups were studied: Group A - Lewis rats receiving nerve grafts from isogenic donors; Group B - Lewis rats receiving nerve grafts from Brown-Norway donor rats and treated with saline solution; Group C - Lewis rats receiving nerve grafts from Brown-Norway donor rats and treated with cyclosporine. Nerve regeneration was evaluated by histological analysis and by histomorphometric studies after 6 and 12 weeks. RESULTS: At 6 weeks...

‣ INFLUENCE OF LASER RADIATION IN NERVE REGENERATION IN DIFFERENT TREATMENT SITES

SOUSA, Fausto Fernandes de Almeida; ANDRAUS, Rodrigo Antonio Carvalho; BARBIERI, Claudio Henrique; MAZZER, Nilton
Fonte: ATHA COMUNICACAO & EDITORA Publicador: ATHA COMUNICACAO & EDITORA
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
67.882725%
Objective: This study seeks to determine, through functional gait assessment in different irradiation sites, the influence of a low-intensity GaAsAl laser beam on an injury caused by crushing the peroneal nerve in rats. Methods: 53 rats were used, which were divided into six groups: normal, injured and untreated, injured and treated using placebo, injured and treated in the bone marrow, injured and treated in the nerve, and injured and treated in both (nerve and bone marrow). The peroneal nerve was crushed using a pair of tweezers, and subsequently treated with laser for 28 consecutive days. The functional gait evaluation analyzed the footprints, which were recorded with a video camera on an acrylic bridge in the preoperative period, and on postoperative days 14, 21 and 28, and assessed using PFI formula software. Results: In the functional gait evaluation, significant differences were found only on postoperative day 14. Conclusion: Based on the functional gait evaluation, low-intensity GaAs AI irradiation was able to accelerate and reinforce the process of peripheral nerve regeneration in rats on postoperative day 14, both in the bone marrow- and in the nerve-treated groups.

‣ Microscopic Evidences That Bone Marrow Mononuclear Cell Treatment Improves Sciatic Nerve Regeneration After Neurorrhaphy

LOPES-FILHO, Joao D.; CALDAS, Heloisa C.; SANTOS, Fernanda C. A.; MAZZER, Nilton; SIMOES, Gustavo F.; KAWASAKI-OYAMA, Rosa S.; ABBUD-FILHO, Mario; OLIVEIRA, Alexandre R.; TOBOGA, Sebastiao R.; CHUEIRE, Alceu G.
Fonte: WILEY-BLACKWELL Publicador: WILEY-BLACKWELL
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
68.123423%
Cell therapy constitutes a possibility for improving nerve regeneration, increasing the success of nerve repair. We evaluate the use of mononuclear cells in the regeneration of the sciatic nerve after axotomy followed by end-to-end neurorrhaphy. Forty adult male Wistar rats (250300 g) were divided into four groups: (1) sham, (2) neurorrhaphy: the sciatic nerve was sectioned and repaired using epineural sutures, (3) culture medium: after the suture, received an injection of 10 mu L of culture medium into the nerve, and (4) mononuclear cell: after the suture, a concentration of 3 X 10(6) of mononuclear cell was injected in epineurium region. Mononuclear cells were obtained from the bone marrow aspirates and separated by Ficoll-Hypaque method. The histological analyses were performed at the 4th postoperative day. The sciatic functional index, histological, and morphometric analyzes were used to evaluate nerve regeneration at the 6th postoperative week. Six rats were used for immunohistochemical analysis on the 4th postoperative day. In the group 4, on the fourth day, the histological analysis demonstrated a more accelerated degenerative process and an increase of the neurotrophic factors was observed. In the 6th week, all the morphometric results of the group 4 were statistically better compared with groups 2 and 3. There was a statistically significant improvement in the sciatic functional index for group 4 compared with groups 2 and 3. Mononuclear cells stimulated nerve regeneration...

‣ Ações das Neurocinas CNTF e IL-6 Exógenas na Regeneração Nervosa Periférica; Effects of Exogenous Ciliary Neurotrophic Factor and lnterleukin-6 in Peripheral Nerve Regeneration

Pereira, Francisco Carlos
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 20/01/1999 Português
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Foi estudada a ação do fator neurotrófico ciliar (CNTF) e da interleucina 6 (IL-6) exógenos na regeneração nervosa periférica. Aplicação de CNTF recombinante humano: o nervo ciático de 12 camundongos adultos C57BL/6J (3 grupos, n=4) foi seccionado e os cotos proximal e distal ancorados com ponto único de sutura no interior de tubo de polietileno (TP) com 6 mm d e comprimento e 0,76 mm de diâmetro interno, com intervalo de 4 mm entre os cotos. Os TP foram implantados vazios ou preenchidos com uma das seguintes soluções: (1) colágeno (col.) purificado (Vitrogen, 2,4 mg/ml) em tampão fosfato (0,2M), na proporção d e 1:1; (2) col.+CNTF (1:1, com 100 ng/ml de CNTF/tubo). Após 6 semanas os tubos contendo ao cabos nervosos regenerado s (CR) foram processados e incluídos em Epon. Fibras nervosas mielínicas foram contadas na porção média dos CR com um sistema controlado por computador (Biographics). Camundongos que receberam CNTF apresentaram número significativamente maior de axônios regenerados (3027±62, média±erro padrão) em relação aos animais implantados com tubos vazios (1384±128) ou preenchidos apenas com colágeno (1639±104). Outros 12 animais adicionais tiveram o nervo ciático seccionado e reparado da mesma maneira. Após 6 semanas...

‣ Estudo da regeneração nervosa em modelo experimental de ratos diabéticos; Nerve regeneration in an experimental diabetic rat model

Salles Junior, Guataçara Schenfelder
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 14/06/2012 Português
Relevância na Pesquisa
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INTRODUÇÃO: Embora a população diabética seja extremamente significativa e crescente nos últimos anos, os estudos envolvendo regeneração nervosa e diabetes mellitus (DM) não são muitos e, frequentemente, mostram resultados conflitantes e pouco conclusivos. O objetivo deste trabalho foi estudar a regeneração nervosa em ratos diabéticos. MÉTODOS: O trabalho foi realizado no Laboratório de Microcirurgia Experimental (LIM 4) do HC-FMUSP. Utilizaram-se 40 ratos machos, que foram separados em 2 grupos principais, cada um com 20 animais: grupo controle e grupo diabetes. Cada grupo foi subdividido em 2 subgrupos de 10 animais: controle com neurorrafia término-terminal (CN), controle com enxerto de nervo (CE), diabético com neurorrafia términoterminal (DN) e diabético com enxerto de nervo (DE). A indução do DM foi feita pela inoculação de estreptozotocina na dose de 60mg/Kg, por via intraperitoneal e após 8 semanas os animais foram submetidos à cirurgia. Diversas avaliações foram feitas: massa corporal, glicemias, testes da marcha e eletrofisiológico, índice de peso do músculo tríceps sural (pata operada/não operada) e análises histomorfométricas. RESULTADOS: Ocorreram 3 óbitos, 1 no CN, 1 no DN e 1 no DE. Nas avaliações pósoperatórias o peso dos animais do grupo controle foi maior que o do grupo diabetes (p<0...

‣ Microscopic Evidences That Bone Marrow Mononuclear Cell Treatment Improves Sciatic Nerve Regeneration After Neurorrhaphy

Lopes-Filho, Joao D.; Caldas, Heloisa C.; Santos, Fernanda C. A.; Mazzer, Nilton; Simoes, Gustavo F.; Kawasaki-Oyama, Rosa S.; Abbud-Filho, Mario; Oliveira, Alexandre R.; Toboga, Sebastiao R.; Chueire, Alceu G.
Fonte: Wiley-Blackwell Publicador: Wiley-Blackwell
Tipo: Artigo de Revista Científica Formato: 355-363
Português
Relevância na Pesquisa
68.108384%
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Cell therapy constitutes a possibility for improving nerve regeneration, increasing the success of nerve repair. We evaluate the use of mononuclear cells in the regeneration of the sciatic nerve after axotomy followed by end-to-end neurorrhaphy. Forty adult male Wistar rats (250300 g) were divided into four groups: (1) sham, (2) neurorrhaphy: the sciatic nerve was sectioned and repaired using epineural sutures, (3) culture medium: after the suture, received an injection of 10 mu L of culture medium into the nerve, and (4) mononuclear cell: after the suture, a concentration of 3 X 10(6) of mononuclear cell was injected in epineurium region. Mononuclear cells were obtained from the bone marrow aspirates and separated by Ficoll-Hypaque method. The histological analyses were performed at the 4th postoperative day. The sciatic functional index, histological, and morphometric analyzes were used to evaluate nerve regeneration at the 6th postoperative week. Six rats were used for immunohistochemical analysis on the 4th postoperative day. In the group 4, on the fourth day, the histological analysis demonstrated a more accelerated degenerative process and an increase of the neurotrophic factors was observed. In the 6th week...

‣ Microscopic Evidences That Bone Marrow Mononuclear Cell Treatment Improves Sciatic Nerve Regeneration After Neurorrhaphy

LOPES-FILHO, Joao D.; CALDAS, Heloisa C.; SANTOS, Fernanda C. A.; MAZZER, Nilton; SIMOES, Gustavo F.; KAWASAKI-OYAMA, Rosa S.; ABBUD-FILHO, Mario; OLIVEIRA, Alexandre R.; TOBOGA, Sebastiao R.; CHUEIRE, Alceu G.
Fonte: WILEY-BLACKWELL Publicador: WILEY-BLACKWELL
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
68.108384%
Cell therapy constitutes a possibility for improving nerve regeneration, increasing the success of nerve repair. We evaluate the use of mononuclear cells in the regeneration of the sciatic nerve after axotomy followed by end-to-end neurorrhaphy. Forty adult male Wistar rats (250300 g) were divided into four groups: (1) sham, (2) neurorrhaphy: the sciatic nerve was sectioned and repaired using epineural sutures, (3) culture medium: after the suture, received an injection of 10 mu L of culture medium into the nerve, and (4) mononuclear cell: after the suture, a concentration of 3 X 10(6) of mononuclear cell was injected in epineurium region. Mononuclear cells were obtained from the bone marrow aspirates and separated by Ficoll-Hypaque method. The histological analyses were performed at the 4th postoperative day. The sciatic functional index, histological, and morphometric analyzes were used to evaluate nerve regeneration at the 6th postoperative week. Six rats were used for immunohistochemical analysis on the 4th postoperative day. In the group 4, on the fourth day, the histological analysis demonstrated a more accelerated degenerative process and an increase of the neurotrophic factors was observed. In the 6th week, all the morphometric results of the group 4 were statistically better compared with groups 2 and 3. There was a statistically significant improvement in the sciatic functional index for group 4 compared with groups 2 and 3. Mononuclear cells stimulated nerve regeneration...

‣ Cutaneous lesions sensory impairment recovery and nerve regeneration in leprosy patients

Illarramendi,Ximena; Rangel,Emanuel; Miranda,Alice Machado; Castro,Ana Claudia Ribeiro de; Magalhães,Giselle de Oliveira; Antunes,Sérgio Luiz Gomes
Fonte: Instituto Oswaldo Cruz, Ministério da Saúde Publicador: Instituto Oswaldo Cruz, Ministério da Saúde
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2012 Português
Relevância na Pesquisa
67.96889%
It is important to understand the mechanisms that enable peripheral neurons to regenerate after nerve injury in order to identify methods of improving this regeneration. Therefore, we studied nerve regeneration and sensory impairment recovery in the cutaneous lesions of leprosy patients (LPs) before and after treatment with multidrug therapy (MDT). The skin lesion sensory test results were compared to the histopathological and immunohistochemical protein gene product (PGP) 9.5 and the p75 nerve growth factor receptors (NGFr) findings. The cutaneous neural occupation ratio (CNOR) was evaluated for both neural markers. Thermal and pain sensations were the most frequently affected functions at the first visit and the most frequently recovered functions after MDT. The presence of a high cutaneous nerve damage index did not prevent the recovery of any type of sensory function. The CNOR was calculated for each biopsy, according to the presence of PGP and NGFr-immunostained fibres and it was not significantly different before or after the MDT. We observed a variable influence of MDT in the recovery from sensory impairment in the cutaneous lesions of LPs. Nociception and cold thermosensation were the most recovered sensations. The recovery of sensation in the skin lesions appeared to be associated with subsiding inflammation rather than with the regenerative activity of nerve fibres.

‣ Pharmacological immunomodulation enhances peripheral nerve regeneration

Inoe,Ana Paula; Pereira,Francisco Carlos; Stopiglia,Angelo João; Da-Silva,Ciro Ferreira
Fonte: Colégio Brasileiro de Patologia Animal - CBPA; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Publicador: Colégio Brasileiro de Patologia Animal - CBPA; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2007 Português
Relevância na Pesquisa
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To assess the effect of N-Acetylmuramyl-L-Alanyl-D-Isoglutamine MDP topically administrated on the regenerating peripheral neurons, twelve male C57BL/6J adult mice were equally distributed into three groups. Four mice underwent unilateral sciatic nerve transection and polyethylene tubulization, with a 4mm gap between the proximal and distal nerve stumps and were implanted with collagen + PBS (COL). Other four animals underwent the same surgical procedure but received collagen + MDP (COL/MDP) inside the prosthesis. Four animals were not operated and served as control group (NOR). After 4 weeks, the regenerated nerve cables were processed for total myelinated axon counting and myelinated fiber diameter measurement. The L5 dorsal root ganglion (DRG) was also removed and sectioned for sensory neurons counting and measurement. The results revealed significant difference (p<0.05) in axonal counting among the groups NOR (4,355±32), COL (1,869±289) and COL/MDP (2,430±223). There was a significant reduction in the axonal diameter in the operated groups (COL=3.38µm±1.16 and COL/MDP=3.54µm±1.16) compared to NOR (6.19µm±2.45). No difference was found in the number of DRG neurons between the experimental groups (COL=564±51; COL/MDP=514±56)...

‣ Stretch-induced nerve injury: a proposed technique for the study of nerve regeneration and evaluation of the influence of gabapentin on this model

Machado,J.A.; Ghizoni,M.F.; Bertelli,J.; Teske,Gabriel C.; Teske,Guilherme C.; Martins,D.F.; Mazzardo-Martins,L.; Cargnin-Ferreira,E.; Santos,A.R.S.; Piovezan,A.P.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2013 Português
Relevância na Pesquisa
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The rat models currently employed for studies of nerve regeneration present distinct disadvantages. We propose a new technique of stretch-induced nerve injury, used here to evaluate the influence of gabapentin (GBP) on nerve regeneration. Male Wistar rats (300 g; n=36) underwent surgery and exposure of the median nerve in the right forelimbs, either with or without nerve injury. The technique was performed using distal and proximal clamps separated by a distance of 2 cm and a sliding distance of 3 mm. The nerve was compressed and stretched for 5 s until the bands of Fontana disappeared. The animals were evaluated in relation to functional, biochemical and histological parameters. Stretching of the median nerve led to complete loss of motor function up to 12 days after the lesion (P<0.001), compared to non-injured nerves, as assessed in the grasping test. Grasping force in the nerve-injured animals did not return to control values up to 30 days after surgery (P<0.05). Nerve injury also caused an increase in the time of sensory recovery, as well as in the electrical and mechanical stimulation tests. Treatment of the animals with GBP promoted an improvement in the morphometric analysis of median nerve cross-sections compared with the operated vehicle group...

‣ Histopathological analysis of gangliosides use in peripheral nerve regeneration after axonotmesis in rats

Ribeiro,Camila Maria Beder; Vasconcelos,Belmiro Cavalcanti do Egito; Silva Neto,Joaquim Celestino da; Silva Júnior,Valdemiro Amaro da; Figueiredo,Nancy Gurgel
Fonte: Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia Publicador: Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2008 Português
Relevância na Pesquisa
68.0904%
PURPOSE: To analyze the action of gangliosides in peripheral nerve regeneration in the sciatic nerve of the rat. METHODS: The sample was composed of 96 male Wistar rats. The animals were anaesthetized and, after identification of the anaesthesic plane, an incision was made in the posterior region of the thigh, followed by skin and muscle divulsion. The right sciatic nerve was isolated and compressed for 2 minutes. Continuous suture of the skin was performed. The animals were randomly divided into two groups: the experimental group (EG), which received subcutaneous injection of gangliosides, and the control group (CG), which received saline solution (0.9%) to mimic the effects of drug administration. RESULTS: No differences were observed between the experimental and control groups evaluated on the eighth day of observation. At 15 and 30 days the EG showed an decrease in Schwann cell activity and an apparent improvement in fibre organization; at 60 days, there was a slight presence of Schwann cells in the endoneural space and the fibres were organized, indicating nerve regeneration. At 15 and 30 days, the level of cell reaction in the CG had diminished, but there were many cells with cytoplasm in activity and in mitosis; at 60 days, hyperplastic Schwann cells and mitotic activity were again observed...

‣ Histological analysis of low-intensity laser therapy effects in peripheral nerve regeneration in Wistar rats

Câmara,Cibele Nazaré da Silva; Brito,Marcus Vinicius Henriques; Silveira,Edvaldo Lima; Silva,Diego Sá Guimarães da; Simões,Vivian Roberta Ferreira; Pontes,Roberto Waldesmand Farias
Fonte: Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia Publicador: Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2011 Português
Relevância na Pesquisa
67.955513%
Purpose: Analyze the influence of low-intensity laser therapy in the sciatic nerve regeneration of rats submitted to controlled crush through histological analysis. Methods: Were used 20 Wistar rats, to analyze the influence of low-intensity laser therapy in the sciatic nerve regeneration, where the injury of the type axonotmesis was induced by a haemostatic clamp Crile (2nd level of the rack). The animals were randomly distributed in 2 groups. Control group (CG n = 10) and Laser group (LG n = 10). These were subdivided in 2 subgroups each, according to the euthanasia period: (CG14 _ n = 5 and CG21 _ n = 5) and (LG14 _ n = 5 and LG21 _ n = 5). At the end of treatment, the samples were removed and prepared for histological analysis, where were analyzed and quantified the following findings: Schwann cells, myelinic axons with large diameter and neurons. Results: In the groups submitted to low-intensity laser therapy, were observed an increase in the number of all analyzed aspects with significance level. Conclusion: The irradiation with low intensity laser (904nm) influenced positively the regeneration of the sciatic nerve in Wistar rats after being injured by crush (axonotmesis), becoming the nerve recovery more rapid and efficient.

‣ Combined polyglycolic acid tube and autografting versus autografting or polyglycolic acid tube alone. A comparative study of peripheral nerve regeneration in rats

Costa,Márcio Paulino; Teixeira,Nuberto Hopfgartner; Longo,Marco Vinicius Losso; Gemperli,Rolf; Costa,Heloisa Juliana Zabeu Rossi
Fonte: Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia Publicador: Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2015 Português
Relevância na Pesquisa
67.67105%
PURPOSE: To compare sciatic nerve regeneration in rats using three different techniques of repair. METHODS: Fifteen isogonics rats were divided into three groups according to the method used to repair a 5-mm long defect created in the sciatic nerve: autogenous graft (Group A), polyglycolic acid tube (PGAt) (Group B), and of the association of PGAt with the graft (Group C). Histological analysis, regenerated myelinated axon number count and functional analysis were used to compare after six weeks. RESULTS: There was no difference in fiber diameter and degree of myelinization presented by Groups A, B and C. Group B presented the lowest number of regenerated axons. The groups did not display any significant functional difference after walking track analysis (p<0.05). CONCLUSION: No differences between the three groups in terms of functional recovery, although there were histological differences among them.

‣ Mandibular Branch of the Facial Nerve in Wistar Rats: New Experimental Model to Assess Facial Nerve Regeneration

Bento,Ricardo Ferreira; Salomone,Raquel; Nascimento,Silvia Bona do; Ferreira,Ricardo Jose Rodriguez; Silva,Ciro Ferreira da; Costa,Heloisa Juliana Zabeu Rossi
Fonte: Fundação Otorrinolaringologia Publicador: Fundação Otorrinolaringologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2014 Português
Relevância na Pesquisa
68.05743%
Introduction The ideal animal model for nerve regeneration studies is the object of controversy, because all models described by the literature have advantages and disadvantages. Objective To describe the histologic and functional patterns of the mandibular branch of the facial nerve of Wistar rats to create a new experimental model of facial nerve regeneration. Methods Forty-two male rats were submitted to a nerve conduction test of the mandibular branch to obtain the compound muscle action potential. Twelve of these rats had the mandibular branch surgically removed and submitted to histologic analysis (number, partial density, and axonal diameter) of the proximal and distal segments. Results There was no statistically significant difference in the functional and histologic variables studied. Conclusion These new histologic and functional standards of the mandibular branch of the facial nerve of rats establish an objective, easy, and greatly reproducible model for future facial nerve regeneration studies.

‣ Aberrant facial nerve regeneration (AFR): an under-recognized cause of ptosis

Chen, C.; Malhotra, R.; Muecke, J.; Davis, G.; Selva-Nayagam, D.
Fonte: Nature Publishing Group Publicador: Nature Publishing Group
Tipo: Artigo de Revista Científica
Publicado em //2004 Português
Relevância na Pesquisa
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INTRODUCTION: Aberrant facial nerve regeneration (AFR) following facial nerve palsy may give rise to ptosis because of increased orbicularis tone. We describe a series of patients presenting with ptosis where the underlying aetiology of AFR was often not recognized by the referring clinicians. METHODS: Retrospective case review. RESULTS: A total of 15 cases with ptosis, secondary to AFR, were seen at the Royal Adelaide Hospital Oculoplastic Clinic between 2000 and 2002. Of these, 10 (67%) were referred by general ophthalmologists. Ptosis was the only reason for referral in 11 patients (73%) and features of AFR or a past history of facial nerve palsy were not mentioned in seven referrals (overall 46%). All patients reported a previous facial palsy. The palpebral aperture was reduced on the affected side with reduction in both upper and lower margin reflex distance (MRD) by a mean of 1.5±0.7?mm (P<0.001) and 1.0±0.3?mm (P<0.001), respectively. The orbicularis tone was increased and strength reduced on the affected side in all patients. However, none had lagophthalmos. Signs of AFR were demonstrated in all patients with either an increase in ptosis or eyelid closure on the affected side during cheek puffing. CONCLUSION: Patients with AFR following facial nerve palsy may present with ptosis without recognition of the underlying aetiology. Signs of AFR ptosis include a decreased palpebral aperture with a reduced upper and lower MRD. The diagnosis can be established with demonstration of an increase in ptosis during cheek puffing. Recognition of AFR is important in these cases owing to the implications for management and post-operative patient satisfaction.

‣ Peripheral nerve injury and regeneration

Terenghi, G.
Fonte: Murcia : F. Hernández Publicador: Murcia : F. Hernández
Tipo: Artigo de Revista Científica Formato: application/pdf
Português
Relevância na Pesquisa
58.24958%
The process of nerve regeneration has been studied extensively by traditional morphological methods, but it is only recently that has been possible to identify more precisely the contribution of different nerve subpopulations. By studying different models of nerve repair and regeneration, it is becoming apparent that other tissue components are contributing to the overall process. When muscle grafting is carried out to repair an injured nerve, the regenerating axons are migrating in parallel with Schwann cells to bridge the nerve gap. The presence of Schwann cells is essential for a successful nerve regeneration, most probably because their production of different neuronal trophic factors. This pattern is also repeated when fibronectin mats are used for nerve repair, indicating the possibility to use this new synthetic matrix for clinical application. If the target organ is analysed after nerve repair, the recovery of all nerve components is evident. However, the process occurs at different times in separate s k i compartments, and the regeneration of the autonomic innervation appears to be preceded by that of the sensory nerves. When looking at cutaneous nerve regeneration following different type of injury, a common pattern of events becomes apparent. In skin flaps...

‣ Contribution of the proximal and distal nerve stumps to peripheral nerve regeneration in silicone chambers

Díaz-Flores, Lucio; Gutiérrez, Ricardo; Varela, H.; Evora, P.; Valladares, Francisco; Rodríguez, M.; Rancel, N.; Álvarez-Argüelles, H.
Fonte: Murcia : F. Hernández Publicador: Murcia : F. Hernández
Tipo: Artigo de Revista Científica Formato: application/pdf
Português
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The specific contnbution of the proximal and distal neme stumps across an 8 mm gap within silicone chamber regeneration models was studied. For this, proximal and distal (Group A), distal and distal (Group B) and proximal and proximal (Group C) neme stumps were placed in opposite ends of silicone chambers. In al1 the groups, a tissue cable forms between the nerve stumps, demonstrating that, without distinction, proximal or distal stumps can stimulate the growth of other proximal or distal stumps. Furthermore, in Group B, the newly formed pseudo-nerve, in the absence of regenerating axons, contains a number of Schwann cells significantly similar to Group A, which confirms that proliferation and migration of Schwann cells do not require axonal presence or contact. Likewise, the findings demonstrate that, with the exception of the axons, the distal stump contributes to the peripheral nerve regeneration in the same way as the proximal stump. Finally, when proximal stumps are placed in both the opposite ends of the silicone chamber, Schwann cells and regenerating axons grow into the chamber gap from both inserts, and myelination also proceeds from both ends to the centre ofthe chambers.

‣ Effect of low-level laser therapy (LLLT) on peripheral nerve regeneration using fibrin glue derived from snake venom

Buchaim, Rogerio Leone; Andreo, Jesus Carlos; Barraviera, Benedito; Ferreira Junior, Rui Seabra; Buchaim, Daniela Vieira; Rosa Junior, Geraldo Marco; Rodrigues de Oliveira, Alexandre Leite; Rodrigues, Antonio de Castro
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 655-660
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Processo FAPESP: 2010/16.883-0; Objectives: The purpose of this study was to assess whether the adhesive permits the collateral repair of axons originating from a vagus nerve to the interior of a sural nerve graft, and whether low-level laser therapy (LLLT) assists in the regeneration process.Materials and methods: Study sample consisted of 32 rats randomly separated into three groups: Control Group (CG; n = 8), from which the intact sural nerve was collected; Experimental Group (EG; n = 12), in which one of the ends of the sural nerve graft was coapted to the vagus nerve using the fibrin glue; and Experimental Group Laser (EGL; n = 12), in which the animals underwent the same procedures as those in EG with the addition of LLLT. Ten weeks after surgery, the animals were euthanized. Morphological analysis by means of optical and electron microscopy, and morphometry of the regenerated fibers were employed to evaluate the results.Results: Collateral regeneration of axons was observed from the vagus nerve to the interior of the autologous graft in EG and EGL, and in CG all dimensions measured were greater and presented a significant difference in relation to EG and EGL...

‣ Evaluation of nerve regeneration in diabetic rats

Salles Jr,Guataçara Schenfelder; Faria,José Carlos Marques de; Busnardo,Fábio Freitas; Gemperli,Rolf; Ferreira,Marcus Castro
Fonte: Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia Publicador: Sociedade Brasileira para o Desenvolvimento da Pesquisa em Cirurgia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/07/2013 Português
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PURPOSE: To compare sciatic nerve regeneration between non-diabetic (control) and streptozotocin-induced diabetic Wistar rats. METHODS:Four subgroups were evaluated. CN: Non-diabetic rats submitted to neurorrhaphy (n=9); DN: Diabetic rats submitted to neurorrhaphy (n=9); CG: Non-diabetic rats submitted to nerve grafting (n=10); DG: Diabetic rats submitted to nerve grafting (n=9). The nerve regeneration was evaluated by walking track analysis (sciatic functional index), electrophysiological test, histomorphometric analysis and triceps surae muscle weight. RESULTS:At 60 days post-surgery, functional recovery of DN was similar to that of the non-diabetic rats (CN, CG), but DG didn't achieve the same. Evoked potential amplitudes showed no statistically significant differences among subgroups. Triceps surae muscle was heavier in CN. No statistically significant differences were observed between the control and diabetes subgroups with respect to histomorphometric analysis. CONCLUSION: After 60 days, DN had a functionally similar recovery to that of the control animals, whereas nerve grafting in diabetic rats didn't allow the same. The muscle atrophy was lower in CN. In the rest of evaluations, as electrophysiological and histomorphometric...