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Evaluation of the effect of intrathecal GM1 in 24, 48, and 72 hours after acute spinal cord injury in rats
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Jorge, Daniel de Moraes Ferreira

; Marcon, Raphael Martus

; Cristante, Alexandre Fogaça

; Barros Filho, Tarcísio Eloy Pessoa

; Santos, Gustavo Bispo dos

Clinics

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2023, Volume 78 elocation 100228

Abstract: En | Text: En | PDF: En

Abstract Objective The aim of this study was to evaluate the best timing and feasibility of intrathecal application of sodium monosialoganglioside (GM1) after spinal cord contusion in Wistar rats as an experimental model. Methods Forty Wistar rats were submitted to contusion spinal cord injury after laminectomy. The animals were randomized and divided into four groups: Group 1 - Intrathecal application of GM1 24 hours after contusion; Group 2 - Intrathecal application of GM1 48 hours after contusion; Group 3 - intrathecal application of GM1 72 hours after contusion; Group 4 - Sham, with laminectomy and intrathecal application of 0.5 mL of 0.9% saline solution, without contusion. The recovery of locomotor function was evaluated at seven different moments by the Basso, Beattie, and Bresnahan (BBB) test. They were also assessed by the horizontal ladder, with sensory-motor behavioral assessment criteria, pre-and postoperatively. Results This experimental study showed better functional scores in the group submitted to the application of GM1, with statistically significant results, showing a mean increase when evaluated on known motor tests like the horizontal ladder and BBB, at all times of evaluation (p < 0.05), especially in group 2 (48 hours after spinal cord injury). Also, fewer mistakes and slips over the horizontal ladder were observed, and many points were achieved at the BBB scale analysis. Conclusion The study demonstrated that the intrathecal application of GM1 after spinal cord contusion in Wistar rats is feasible. The application 48 hours after the injury presented the best functional results.

https://doi.org/10.1016/j.clinsp.2023.100228

Translation and Transcultural Adaptation of the Milestones Instrument to Assess Teaching in Medical Residency Services on Orthopedics and Traumatology
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Castro, Ubiratan Brum de

; Gomes, Gustavo Remigio

; Simão, Kalil Francisco Restivo

; Egito, Liev José Cahino do

; Figueiredo, Sávio Daniel Freire de Albuquerque

; Bispo Júnior, Rosalvo Zósimo

Revista Brasileira de Ortopedia

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oct 2022, Volume 57 N. 5 Pages 795 - 801

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Objetivo A ortopedia é uma especialidade pouco presente na formação de muitas escolas médicas brasileiras, sendo que não foi identificado nenhum questionário que avalie o ensino das desordens musculoesqueléticas durante a formação médica. O Orthopedic Surgery Milestone Project constitui um instrumento de avaliação de residentes de ortopedia nos programas de residência ou bolsas credenciados pela ACGME (The Accreditation Council for Graduate Medical Education) e pelo ABOS (The American Board of Orthopedic Surgery). O objetivo é realizar a tradução para a língua portuguesa e adaptação transcultural do Orthopedic Surgery Milestone Project. Métodos A tradução e adaptação transcultural consistiram na tradução inicial para o português, retro tradução para o inglês, análise para a obtenção de uma versão consensual pré-teste e posterior versão final. Resultados A versão final foi considerada adequada e equivalente à original para a avaliação dos residentes de ortopedia ao longo do programa de residência médica. Conclusões Diante da falta de instrumentos para a avaliação dos residentes em Ortopedia, a tradução e a adaptação transcultural do Orthopedic Surgery Milestone Project foi compatível, podendo ser um instrumento para uma formação médica mais adequada.

Abstract Objective Orthopedics is not very common in many Brazilian medical schools, and there is no questionnaire to assess the teaching of musculoskeletal disorders during medical training. The Orthopedic Surgery Milestone Project is an assessment tool for orthopedic residents in programs or fellowships recognized by the Accreditation Council for Graduate Medical Education (ACGME) and the American Board of Orthopedic Surgery (ABOS). This study aims to translate the Orthopedic Surgery Milestone Project into Portuguese and to perform its transcultural adaptation. Methods The translation and transcultural adaptation consisted of the initial translation into Portuguese, back-translation into English, preparation of a pretest consensual text, and the subsequent elaboration of a final text. Results The final text was deemed adequate and equivalent to the original one for the evaluation of orthopedics residents throughout their program. Conclusions Given the lack of instruments for the assessment of orthopedic residents, the translation and transcultural adaptation of the Orthopedic Surgery Milestone Project were compatible; this can be an instrument for improved medical education.

https://doi.org/10.1055/s-0042-1748942

Effects of ganglioside GM1 and erythropoietin on spinal cord injury in mice: Functional and immunohistochemical assessments
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Torelli, Alessandro Gonzalez

; Cristante, Alexandre Fogaça

; Barros-Filho, Tarcísio Eloy Pessoa de

; Santos, Gustavo Bispo dos

; Morena, Beatriz Cintra

; Correia, Felipe Fernandes

; Paschon, Vera

Clinics

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2022, Volume 77 elocation 100006

Abstract: En | Text: En | PDF: En

ABSTRACT Objectives: To evaluate the functional and immunohistochemical effects of ganglioside GM1 and erythropoietin following experimental spinal cord injury. Methods: Thirty-two male BALB/c mice were subjected to experimental spinal cord injury using the NYU Impactor device and were randomly divided into the following groups: GM1 group, receiving standard ganglioside GM1 (30 mg/kg); erythropoietin group, receiving erythropoietin (1000 IU/kg); combination group, receiving both drugs; and control group, receiving saline (0.9%). Animals were evaluated according to the Basso Mouse Scale (BMS) and Hindlimb Mouse Function Score (MFS). After euthanasia, the immunohistochemistry of the medullary tissue of mice was analyzed. All animals received intraperitoneal treatment. Results: The GM1 group had higher BMS and MFS scores at the end of the experiment when compared to all other groups. The combination group had higher BMS and MFS scores than the erythropoietin and control groups. The erythropoietin group had higher BMS and MFS scores than the control group. Immunohistochemical tissue analysis showed a significant difference among groups. There was a significant increase in myelinated axons and in the myelinated axon length in the erythropoietin group when compared to the other intervention groups (p < 0.01). Conclusion: Erythropoietin and GM1 have therapeutic effects on axonal regeneration in mice subjected to experimental spinal cord injury, and administration of GM1 alone had the highest scores on the BMS and MFS scales.

https://doi.org/10.1016/j.clinsp.2022.100006

EXPERIMENTAL MODEL STUDY OF ISCHEMIC NECROSIS INDUCTION OF THE GROWING FEMORAL HEAD
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GORIOS FILHO, ANTONIO

; SANTOS, GUSTAVO BISPO DOS

; GUARNIERO, JOSÉ ROBERTO BEVILACQUA

; ANGELI, LUIZ RENATO AGRIZZI DE

; GRANGEIRO, PATRICIA MORENO

; GUARNIERO, ROBERTO

Acta Ortopédica Brasileira

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2022, Volume 30 N. 2 elocation e247996

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO Na tentativa de compreender melhor a etiologia da necrose da cabeça femoral, existe uma diversidade de modelos experimentais tanto no que diz respeito à variedade das espécies em que é induzida a necrose quanto nas técnicas operatórias utilizadas para o tratamento. Objetivo: Este trabalho tem fundamentalmente dois objetivos: a revisão da literatura concernente aos modelos experimentais da necrose avascular da cabeça do fêmur em crescimento e demonstrar a reprodutibilidade do modelo experimental do suíno por meio de um estudo piloto. Métodos: Foi realizada uma revisão bibliográfica descrevendo as tentativas ao longo do tempo em buscar qual seria a melhor espécie e técnica para indução que reproduzisse a necrose isquêmica da cabeça do fêmur em crescimento nos humanos. Simultaneamente foi feito um estudo piloto para verificar a replicação da indução na espécie suína, o espécime cujo quadril tem mais similaridades com o humano. A análise metodológica do piloto consiste na radiologia convencional e verificação das possíveis alterações anátomo patológicas. Resultados: Nos exames por imagem, foram observadas sub-luxação lateral da cabeça do fêmur e aparência triangular da cabeça, caracterizando o achatamento da mesma; no exame macroscópico, identificamos o achatamento da cabeça femoral com alargamento e encurtamento do colo; na histologia, identificamos a proliferação da cartilagem articular com presença de tecido regenerativo vascular de granulação, com osteoclastos e tecido fibrocartilaginoso na região metafisária do colo femoral. Conclusão: Podemos inferir que o modelo experimental suíno pode servir como ferramenta valiosa para a reprodutibilidade das alterações anátomo patológicas da necrose isquêmica da cabeça femoral em crescimento. O modelo é reprodutível e factível, servindo para estudos futuros sobre a anátomo patologia da necrose da cabeça do fêmur em crescimento. Nível de Evidência III, Revisão da Literatura .

ABSTRACT Many experimental models exist to better understand the necrosis of the femoral head etiology, both in terms of the species variety in which necrosis is induced and in the operative techniques used for treatment. Objective: This study has two main objectives, the first is to review the literature concerning experimental models of avascular necrosis of the growing femoral head, the second, to demonstrate the experimental pig model’s reproducibility using a pilot study. Methods: This was a bibliographic review to describe the attempts over time to find the best species and technique for induction that would reproduce ischemic necrosis of the growing femoral head in humans. Simultaneously, a pilot study was performed to verify the replication of induction in pigs, the species that has more similarities with the human hip. The pilot’s methodological analysis consists of conventional radiology and verification of possible anatomical, pathological changes. Results: In imaging exams; lateral sub-dislocation of the femur head and triangular appearance of the head were observed, characterizing its flattening; in macroscopic examination, the femoral head flattening with femoral neck widening and shortening was identified; in histology, the proliferation of articular cartilage with the presence of vascular granulation regenerative tissue, with osteoclasts and fibrocartilaginous tissue in the metaphyseal femoral neck region was identified. Conclusion: The experimental pig model can be used as a valuable tool for the reproducibility of anatomical, pathological changes in ischemic necrosis of the growing femoral head. The model is reproducible and feasible and can be beneficial for future studies on the anatomical pathology of necrosis of the growing femoral head. Level of Evidence III, Literature Review .

https://doi.org/10.1590/1413-785220223002247996

EFFECT OF HYPERBARIC OXYGEN THERAPY ON NERVE REGENERATION IN RATS
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BARROS, THIAGO FELIPE DOS SANTOS

; PAULOS, RENATA GREGORIO

; IWASE, FERNANDA DO CARMO

; SANTOS, GUSTAVO BISPO DOS

; REZENDE, MARCELO ROSA DE

; MATTAR JÚNIOR, RAMES

Acta Ortopédica Brasileira

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2022, Volume 30 N. 2 elocation e191015

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO Objetivo: Avaliar as alterações histológicas nos nervos periféricos após neurorrafia do nervo ciático de ratos, de acordo com o tempo de exposição ao tratamento com câmara hiperbárica de oxigênio. Métodos: Vinte e cinco ratos da raça Wistar foram divididos em cinco grupos conforme o tempo de exposição ao tratamento com câmara hiperbárica de oxigênio. O grupo 1 não recebeu o tratamento; o grupo 2 recebeu uma semana de terapia; o grupo 3, duas semanas; o grupo 4, três semanas; e o grupo 5, quatro semanas. Após quatro semanas de pós-operatório, os animais foram submetidos à eutanásia e uma amostra do nervo ciático foi enviada para análise histológica. Foram feitas contagens do número de axônios proximalmente e distalmente à neurorrafia, com medição do índice de regeneração axonal. Resultados: Observamos que o aumento do número de axônios distais à neurorrafia foi diretamente proporcional ao tempo de exposição à câmara hiperbárica de oxigênio, sendo mais expressivo a partir da terceira semana de tratamento. Entretanto, a análise estatística não encontrou diferença significativa entre os grupos. Conclusão: A análise descritiva sugere benefício do uso da câmara hiperbárica de oxigênio. Porém, devido à amostra reduzida, o estudo não apresentou resultados estatisticamente relevantes, sendo necessária a realização de estudos subsequentes com amostragem mais significativa. Nível de Evidência II, Estudo Prospectivo Comparativo.

ABSTRACT Objective: To evaluate histological changes in peripheral nerves of rats after sciatic nerve neurorrhaphy, according to the time of exposure to hyperbaric oxygen chamber treatment. Methods: Twenty-five Wistar rats were divided into 5 groups according to the amount of exposure to hyperbaric oxygen chamber treatment. Group 1 was the control and there was no use of hyperbaric oxygen chamber; group 2 received one week of therapy; group 3, two weeks; group 4, three weeks; and group 5, four weeks. After the fourth postoperative week, the animals were submitted to euthanasia and a sciatic nerve sample sent for histological analysis. Axons proximal and distal to the neurorrhaphy were counted with axonal regeneration index measurement. Results: We observed that the number of axons distal to neurorrhaphy increases with the amount of hyperbaric oxygen chamber exposure, the results were more expressive from the third week of treatment. However, the statistical analysis found no significant difference between the groups. Conclusion: The descriptive analysis suggests benefit of using hyperbaric oxygen chamber directly proportional to the time of therapy. The study, however, did not present statistically relevant results, probably due to the reduced sample size. Subsequent studies with more significant sampling would be of great value. Level of Evidence II, Prospective Comparative Study.

https://doi.org/10.1590/1413-785220223002191015

Structured evaluation of a comprehensive microsurgical training program
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Mattar, Tiago Guedes da Motta

; Santos, Gustavo Bispo dos

; Telles, João Paulo Mota

; Rezende, Marcelo Rosa de

; Wei, Teng Hsiang

; Mattar Júnior, Rames

Clinics

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2021, Volume 76 elocation e3194

Abstract: En | Text: En | PDF: En

OBJECTIVES: This study proposed a structured microsurgical training program and evaluated it with the assistance of a large sample of surgeons. METHODS: The practical course comprised 16 sessions of approximately 4 hours each. This included two sessions for suturing rubber gloves and two sessions for suturing arteries, veins, and nerves in chicken thighs. The other sessions were performed on the femoral vessels of rats: 5 sessions for end-to-end arterial anastomosis, 5 for end-to-end venous anastomosis, 1 for arterial grafting, and 1 for end-to-side anastomosis. We conducted a structured assessment of the microsurgical skills in each training session. RESULTS: In this study, 89 surgeons were evaluated. The mean scores for the different procedures were as follows: glove suturing, 33.3±0.59; chicken nerve end-to-end anastomosis, 40.3±0.49; chicken artery suturing, 40.9±0.36; chicken vein suturing, 42.3±0.36; graft interposition, 44.8±0.7; and end-to-side anastomosis, 43.7±0.63 (p<0.05 for all). The chicken thigh suturing scores were significantly higher than the rubber gloves suturing scores (p<0.01). There were no differences between scores of the rat artery and chicken thigh suturing procedures (p=0.24). The rat venous anastomosis scores were higher than the rat arterial anastomosis scores (p=0.02), as were graft interposition scores when compared with end-to-end venous anastomosis scores. The end-to-side anastomosis scores did not differ significantly from the grafting scores (p=0.85). The most common errors were inadequate knotting technique and suture rupture due to inadequate technique (both n=88 [98.9%]). CONCLUSION: We propose a 16-step, progressive microsurgical training program to learn the basic microsurgical techniques comprehensively and reliably. The program was evaluated in a large sample of trainees, and it demonstrated the adequacy of the training sequence and results.

https://doi.org/10.6061/clinics/2021/e3194 76 downloads

Pulmonary thromboembolism in conjunction with intracavitary thrombus caused by severe acute respiratory syndrome coronavirus-2 infection in a patient living with human immunodeficiency virus
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Silva, Ana Carolina Veronese

; Machado-Junior, Paulo André Bispo

; Anizelli, Leticia Bressan

; Stocco, Rebecca Benicio

; Moura, Lidia Ana Zytynski

; Motta Junior, Jarbas da Silva

; Blume, Gustavo Gavazzoni

Revista da Sociedade Brasileira de Medicina Tropical

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2021, Volume 54 elocation e0157-2021

Abstract: En | Text: En | PDF: En

Abstract Approximately one-third of patients with coronavirus disease 2019 (COVID-19) present with coagulation disorders and hematological changes. However, the clinical manifestations of COVID-19 and prognoses of people living with human immunodeficiency virus (HIV) remain controversial. This study reports the case of a 27-year-old HIV-infected man who regularly used antiretroviral medications, had no other comorbidities and was admitted for acute respiratory distress syndrome caused by COVID-19. Complementary examinations during hospitalization revealed a diagnosis of pulmonary thromboembolism in association with an intracavitary thrombus.

https://doi.org/10.1590/0037-8682-0157-2021 197 downloads

Diretriz Brasileira de Cardio-oncologia – 2020
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Hajjar, Ludhmila Abrahão

; Costa, Isabela Bispo Santos da Silva da

; Lopes, Marcelo Antônio Cartaxo Queiroga

; Hoff, Paulo Marcelo Gehm

; Diz, Maria Del Pilar Estevez

; Fonseca, Silvia Moulin Ribeiro

; Bittar, Cristina Salvadori

; Rehder, Marília Harumi Higuchi dos Santos

; Rizk, Stephanie Itala

; Almeida, Dirceu Rodrigues

; Fernandes, Gustavo dos Santos

; Beck-da-Silva, Luís

; Campos, Carlos Augusto Homem de Magalhães

; Montera, Marcelo Westerlund

; Alves, Sílvia Marinho Martins

; Fukushima, Júlia Tizue

; Santos, Maria Verônica Câmara dos

; Negrão, Carlos Eduardo

; Silva, Thiago Liguori Feliciano da

; Ferreira, Silvia Moreira Ayub

; Malachias, Marcus Vinicius Bolivar

; Moreira, Maria da Consolação Vieira

; Valente Neto, Manuel Maria Ramos

; Fonseca, Veronica Cristina Quiroga

; Soeiro, Maria Carolina Feres de Almeida

; Alves, Juliana Barbosa Sobral

; Silva, Carolina Maria Pinto Domingues Carvalho

; Sbano, João

; Pavanello, Ricardo

; Pinto, Ibraim Masciarelli F.

; Simão, Antônio Felipe

; Dracoulakis, Marianna Deway Andrade

; Hoff, Ana Oliveira

; Assunção, Bruna Morhy Borges Leal

; Novis, Yana

; Testa, Laura

; Alencar Filho, Aristóteles Comte de

; Cruz, Cecília Beatriz Bittencourt Viana

; Pereira, Juliana

; Garcia, Diego Ribeiro

; Nomura, Cesar Higa

; Rochitte, Carlos Eduardo

; Macedo, Ariane Vieira Scarlatelli

; Marcatti, Patricia Tavares Felipe

; Mathias Junior, Wilson

; Wiermann, Evanius Garcia

; Val, Renata do

; Freitas, Helano

; Coutinho, Anelisa

; Mathias, Clarissa Maria de Cerqueira

; Vieira, Fernando Meton de Alencar Camara

; Sasse, André Deeke

; Rocha, Vanderson

; Ramires, José Antônio Franchini

; Kalil Filho, Roberto

Arquivos Brasileiros de Cardiologia

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nov 2020, Volume 115 N. 5 Pages 1006 - 1043

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

https://doi.org/10.36660/abc.20201006 4180 downloads

Cell-Based Therapies for Myocardial Regeneration in Heart Failure: 20 Years of Debate
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Machado-Júnior, Paulo André Bispo

; Blume, Gustavo Gavazzoni

; Francisco, Julio César

; Guarita-Souza, Luiz César

Brazilian Journal of Cardiovascular Surgery

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aug 2020, Volume 35 N. 4 Pages VIII - XI

Abstract: En | Text: En | PDF: En

https://doi.org/10.21470/1678-9741-2020-0362 220 downloads

10.

THE DESIGN OF THE ARTERIOVENOUS VASCULAR LOOP DOES NOT AFFECT ITS PATENCY: EXPERIMENTAL STUDY
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SAITO, MATEUS

; REZENDE, MARCELO ROSA DE

; SANTOS, GUSTAVO BISPO DOS

; BITTENCOURT, THIAGO

; NUNES, MARIA DO CARMO

; MATTAR JUNIOR, RAMES

Acta Ortopédica Brasileira

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jun 2020, Volume 28 N. 3 Pages 121 - 127

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO Objetivo: Avaliar, em coelhos, qual é a influência do desenho da alça de veia femoral com anastomose na artéria femoral, na presença de fluxo (patência) após sete dias. Método: 39 coelhos foram submetidos à microanastomose arteriovenosa com técnica microcirúrgica. As alças foram acomodadas em dois desenhos, um circular e outro, o mais alongado possível sem dobras na alça. Os parâmetros avaliados foram: presença ou não de fluxo, sinais de hemólise, alterações hemodinâmicas. Resultados: após sete dias, o fluxo estava presente em 68% das alças anguladas e em 75% das alças circulares (p > 0,05). Houve, intragrupo, diminuição estatisticamente significante da pCO 2 e aumento estatisticamente significante do pH. Não houve diferença estatística no restante dos parâmetros avaliados entre os dois modelos de alça. Conclusões: apresentamos um modelo reprodutível de alça vascular. Não houve diferença estatística quanto à presença de fluxo após sete dias nos dois modelos de alça vascular. Nível de Evidência V, Estudo experimental em animais.

ABSTRACT Objective: To evaluate the effect of the design of a femoral vascular loop with anastomosis in the femoral artery of rabbits on the presence of flow (patency) after seven days. Methods: A total of 39 rabbits underwent arteriovenous microanastomosis using the microsurgical technique. Two loop designs were used: one circular and the other angled. The parameters evaluated were presence or absence of flow, signs of hemolysis and hemodynamic changes. Results: After seven days, flow was present in 68% of the angled loops and 75% of the circular loops (p > 0.05). There was a significant intragroup decrease in pCO2 and a significant increase in pH. For the other parameters evaluated, no significant differences between the two loop models were found. Conclusions: A reproducible vascular loop model was shown. There was no significant difference between the two vascular loop models about the presence of flow after seven days. Level of Evidence V, Animal experimental study.

https://doi.org/10.1590/1413-785220202803231477 688 downloads

11.

Evaluation of the effects of erythropoietin and interleukin-6 in rats submitted to acute spinal cord injury
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Barros, Alderico Girão Campos de

; Cristante, Alexandre Fogaça

; Santos, Gustavo Bispo dos

; Natalino, Renato José Mendonça

; Ferreira, Ricardo José Rodriguez

; Barros-Filho, Tarcísio Eloy Pessoa de

Clinics

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2019, Volume 74 elocation e674

Abstract: En | Text: En | PDF: En

OBJECTIVE: To evaluate the effects of interleukin-6 (IL-6) and erythropoietin (EPO) in experimental acute spinal cord injury (SCI) in rats. METHODS: Using standardized equipment, namely, a New York University (NYU) Impactor, a SCI was produced in 50 Wistar rats using a 10-g weight drop from a 12.5-mm height. The rats were divided into the following 5 groups of 10 animals each: “Group EPO”, treated with erythropoietin only; “Group EPO + IL-6”, treated with both substances; “Group IL-6”, receiving IL-6 administration only; “Group Placebo”, receiving a placebo solution; and “Group Sham”, submitted to an incomplete procedure (only laminectomy, without SCI). All drugs and the placebo solution were administered intraperitoneally for three weeks. The animals were followed up for 42 days. Functional motor recovery was monitored by the Basso, Beattie, and Bresnahan (BBB) scale on days 2, 7, 14, 21, 28, 35 and 42. Motor-evoked potential tests were performed on the 42nd day. Histological analysis was performed after euthanasia. RESULTS: The group receiving EPO exhibited superior functional motor results on the BBB scale. IL-6 administration alone was not superior to the placebo treatment, and the IL-6 combination with EPO yielded worse results than did EPO alone. CONCLUSIONS: Using EPO after acute SCI in rats yielded benefits in functional recovery. The combination of EPO and IL-6 showed benefits, but with inferior results compared to those of isolated EPO; moreover, isolated use of IL-6 resulted in no benefit.

https://doi.org/10.6061/clinics/2019/e674 413 downloads

12.

Granulocyte Colony-Stimulating Factor Combined with Methylprednisolone Improves Functional Outcomes in Rats with Experimental Acute Spinal Cord Injury
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Teixeira, William Gemio Jacobsen

; Cristante, Alexandre Fogaça

; Marcon, Raphael Martus

; Bispo, Gustavo

; Ferreira, Ricardo

; de Barros-Filho, Tarcísio Eloy Pessoa

Clinics

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2018, Volume 73 elocation e235

Abstract: En | Text: En | PDF: En

OBJECTIVES: To evaluate the effects of combined treatment with granulocyte colony-stimulating factor (G-CSF) and methylprednisolone in rats subjected to experimental spinal cord injury. METHODS: Forty Wistar rats received a moderate spinal cord injury and were divided into four groups: control (no treatment); G-CSF (G-CSF at the time of injury and daily over the next five days); methylprednisolone (methylprednisolone for 24 h); and G-CSF/Methylprednisolone (methylprednisolone for 24 h and G-CSF at the time of injury and daily over the next five days). Functional evaluation was performed using the Basso, Beattie and Bresnahan score on days 2, 7, 14, 21, 28, 35 and 42 following injury. Motor-evoked potentials were evaluated. Histological examination of the spinal cord lesion was performed immediately after euthanasia on day 42. RESULTS: Eight animals were excluded (2 from each group) due to infection, a normal Basso, Beattie and Bresnahan score at their first evaluation, or autophagy, and 32 were evaluated. The combination of methylprednisolone and G-CSF promoted greater functional improvement than methylprednisolone or G-CSF alone (p<0.001). This combination also exhibited a synergistic effect, with improvements in hyperemia and cellular infiltration at the injury site (p<0.001). The groups displayed no neurophysiological differences (latency p=0.85; amplitude p=0.75). CONCLUSION: Methylprednisolone plus G-CSF promotes functional and histological improvements superior to those achieved by either of these drugs alone when treating spinal cord contusion injuries in rats. Combining the two drugs did have a synergistic effect.

https://doi.org/10.6061/clinics/2018/e235 1063 downloads

13.

Standardization of a spinal cord lesion model and neurologic evaluation using mice
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Borges, Paulo Alvim

; Cristante, Alexandre Fogaça

; Barros-Filho, Tarcísio Eloy Pessoa de

; Natalino, Renato Jose Mendonça

; Santos, Gustavo Bispo dos

; Marcon, Raphael Marcus

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2018, Volume 73 elocation e293

Abstract: En | Text: En | PDF: En

OBJECTIVE: To standardize a spinal cord lesion mouse model. METHODS: Thirty BALB/c mice were divided into five groups: four experimental groups and one control group (sham). The experimental groups were subjected to spinal cord lesion by a weight drop from different heights after laminectomy whereas the sham group only underwent laminectomy. Mice were observed for six weeks, and functional behavior scales were applied. The mice were then euthanized, and histological investigations were performed to confirm and score spinal cord lesion. The findings were evaluated to prove whether the method of administering spinal cord lesion was effective and different among the groups. Additionally, we correlated the results of the functional scales with the results from the histology evaluations to identify which scale is more reliable. RESULTS: One mouse presented autophagia, and six mice died during the experiment. Because four of the mice that died were in Group 5, Group 5 was excluded from the study. All the functional scales assessed proved to be significantly different from each other, and mice presented functional evolution during the experiment. Spinal cord lesion was confirmed by histology, and the results showed a high correlation between the Basso, Beattie, Bresnahan Locomotor Rating Scale and the Basso Mouse Scale. The mouse function scale showed a moderate to high correlation with the histological findings, and the horizontal ladder test had a high correlation with neurologic degeneration but no correlation with the other histological parameters evaluated. CONCLUSION: This spinal cord lesion mouse model proved to be effective and reliable with exception of lesions caused by a 10-g drop from 50 mm, which resulted in unacceptable mortality. The Basso, Beattie, Bresnahan Locomotor Rating Scale and Basso Mouse Scale are the most reliable functional assessments, and but the horizontal ladder test is not recommended.

https://doi.org/10.6061/clinics/2018/e293 1034 downloads

14.

Experimental study of histological changes in vascular loops according to the duration of the postoperative period: Application in reconstructive microsurgery
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Paulos, Renata Gregorio

; Rudelli, Bruno Alves

; Filippe, Renee Zon

; dos Santos, Gustavo Bispo

; Herrera, Ana Abarca

; Ribeiro, Andre Araujo

; de Rezende, Marcelo Rosa

; Hsiang-Wei, Teng

; Mattar-Jr, Rames

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sep 2017, Volume 72 N. 9 Pages 538 - 542

Abstract: En | Text: En | PDF: En

OBJECTIVES: To analyze the histological changes observed in venous grafts subjected to arterial blood flow as a function of the duration of the postoperative period to optimize their use in free flap reconstructions. METHOD: Twenty-five rats (7 females and 18 males) underwent surgery. Surgeries were performed on one animal per week. Five weeks after the first surgery, the same five animals were subjected to an additional surgery to assess the presence or absence of blood flow through the vascular loop, and samples were collected for histological analysis. This cycle was performed five times. RESULTS: Of the rats euthanized four to five weeks after the first surgery, no blood flow was observed through the graft in 80% of the cases. In the group euthanized three weeks after the first surgery, no blood flow was observed in 20% of the cases. In the groups euthanized one to two weeks after the first surgery, blood flow through the vascular loop was observed in all animals. Moreover, intimal proliferation tended to increase with the duration of the postoperative period. Two weeks after surgery, intimal proliferation increased slightly, whereas strong intimal proliferation was observed in all rats evaluated five weeks after surgery. CONCLUSION: Intimal proliferation was the most significant change noted in venous grafts as a function of the duration of the postoperative period and was directly correlated with graft occlusion. In cases in which vascular loops are required during free flap reconstruction, both procedures should preferably be performed during the same surgery.

https://doi.org/10.6061/clinics/2017(09)03 555 downloads

15.

COMO ESTUDAR INTERAÇÕES ENTRE NANOPARTÍCULAS E SISTEMAS BIOLÓGICOS
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Radaic, Allan

; Pugliese, Gustavo Oliveira

; Campese, Guilherme Capiraço

; Pessine, Francisco Benedito Teixeira

; Jesus, Marcelo Bispo de

Química Nova

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dec 2016, Volume 39 N. 10 Pages 1236 - 1244

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Although in recent years there has been an increasing amount of literature on nanotechnology and their clinical applications, it is still scarce a deep understanding of the interactions at the molecular levels between nanoparticles and cells. Studies demonstrating the underlying mechanisms of nanoparticles endocytosis, intracellular trafficking, and cellular processing are imperative to understand better how cells interact with those materials and their possible undesired effects, e.g. nanotoxicity. The rising awareness concerning nanoparticles applications and its interactions with the cellular environment is part of the new research field called Nanotoxicology. The cumulative knowledge in nanotoxicology will allow us to foresee toxic effects, establish regulations and limits for nanoparticles applications. In this work, we discuss the theoretical concepts about studying endocytosis and intracellular trafficking of nanoparticles. The nanoparticles-cell interactions are a multi-step process, which can be divided into nanoparticles' internalization, intracellular processing and triggering effects of nanomaterials on eukaryotic cells. Finally, we discuss the main techniques used to study this process: flow cytometry, use of endocytosis inhibitors and confocal microscopy.

https://doi.org/10.21577/0100-4042.20160146 4549 downloads

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