Anacardium occidentale L. (cajueiro) in the healing of skin wounds: an experimental study in rats.

PURPOSE: To analyze the effects of Anacardium occidentale Linn on the healing of skin wounds. METHODS: Twenty Wistar male rats were distributed into four groups (with five animals each one): negative control group (NCG), treated with saline solution; cashew tree group (CG), treated with hydroalcoholic extract of the bark of A. occidentale Linn; manipulated cashew tree group (MCG), with the ointment of extract of the bark of A. occidentale Linn; positive control group (PCG), treated with sunflower oil. All animals were examined daily, observing the macroscopic aspects of the surgical wound. Hematoxylin-eosin staining was used for tissue morphology analysis and Masson's trichrome for better collagen fiber characterization. RESULTS: On day 7, the MCG group had the expansion of the surgical wound covered by crust, exceeding the initial limits. On day 21, the wounds were observed to be completely closed and epithelialized in the NCG and CG groups. PCG and MCG still had remnants of crusts on the wound. The NCG was the only one not to present an abscess in histopathological analysis. CONCLUSIONS: There was a prolongation of the healing phase of the animals treated with the extract, and the animals in the NCG showed a better outcome by histological analysis.

Effect of copaiba oil on correction of abdominal wall defect treated with the use of polypropylene/polyglecaprone mesh.

PURPOSE: To evaluate the effects of copaiba oil on the correction of abdominal defect treated with the use of polypropylene/polyglecaprone mesh in rats. METHODS: A defect in the abdominal wall was created and corrected with polypropylene/polyglecaprone mesh in 36 rats. They were randomly distributed into three groups: control, copaiba by oral administration (gavage) and copaiba oil dip in the mesh. Euthanasia was performed after seven, 14 and 21 post-operative days. The healing process was analyzed regarding the meshes and macroscopic and microscopic aspects. RESULTS: All animals had abdominal adhesions, which were smaller in the copaiba (gavage) group (p<0.05). In microscopy, all animals had an acute inflammation stage and the inflammatory response was best characterized by foreign body-type granulomas around the mesh fragments, which was not found in the mesh fragments within the copaiba dip group. There was a greater area of necrosis and fibrosis in the copaiba dip group compared to the control group (p<0.05). The copaiba (gavage) group had a greater quantity of collagen fibers compared to the control group. CONCLUSION: Copaiba oil administered by gavage decreased the amount of abdominal adhesions, besides accelerating the process of collagen fibers formation, without damages within the early stages of healing. However, when used by dip directly on the mesh, it had corrosive effects compromising the healing process of the abdominal wall.

Effect of copaiba oil on correction of abdominal wall defect treated with the use of polypropylene/polyglecaprone mesh

PURPOSE: To evaluate the effects of copaiba oil on the correction of abdominal defect treated with the use of polypropylene/polyglecaprone mesh in rats. METHODS: A defect in the abdominal wall was created and corrected with polypropylene/polyglecaprone mesh in 36 rats. They were randomly distributed into three groups: control, copaiba by oral administration (gavage) and copaiba oil dip in the mesh. Euthanasia was performed after seven, 14 and 21 post-operative days. The healing process was analyzed regarding the meshes and macroscopic and microscopic aspects. RESULTS: All animals had abdominal adhesions, which were smaller in the copaiba (gavage) group (p<0.05). In microscopy, all animals had an acute inflammation stage and the inflammatory response was best characterized by foreign body-type granulomas around the mesh fragments, which was not found in the mesh fragments within the copaiba dip group. There was a greater area of necrosis and fibrosis in the copaiba dip group compared to the control group (p<0.05). The copaiba (gavage) group had a greater quantity of collagen fibers compared to the control group. CONCLUSION: Copaiba oil administered by gavage decreased the amount of abdominal adhesions, besides accelerating the process of collagen fibers formation, without damages within the early stages of healing. However, when used by dip directly on the mesh, it had corrosive effects compromising the healing process of the abdominal wall.

Histological analysis of low-intensity laser therapy effects in peripheral nerve regeneration in Wistar rats / Avaliação histológica dos efeitos da laserterapia de baixa potência sobre os processos de regeneração nervosa periférica em ratos Wistar

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.

Objetivo: Verificar a influência da terapia com laser de baixa potência na regeneração histológica do nervo ciático de ratos submetidos à neuropraxia controlada. Métodos: Foi utilizada a amostra de 20 ratos da linhagem Wistar, para verificar a influência da terapia com laser de baixa intensidade na regeneração nervosa periférica, onde a lesão do tipo axoniotmese foi induzida por meio de preensão com pinça hemostática de Crile. Os animais foram distribuídos randomicamente dois grupos. Grupo controle (CG n = 10), e Grupo laser (LG n = 10). Cada um destes grupos foi subdividido em dois subgrupos dependendo do período da eutanásia: (CG14 - n = 5 e CG21 - n = 5) e (LG14 - n = 5 e LG21 - n = 5). Ao final do tratamento, amostras do nervo foram retiradas e analisadas histologicamente, nas quais foi adotado na pesquisa a análise do número de neurônios, de células de Schwann (CS) e de axônios mielínicos de grande diâmetro. Resultados: Nos grupos submetidos à terapia com laser de baixa potencia foi observado aumento do número de todos os aspectos analisados com diferença estatisticamente significante. Conclusão: A irradiação com o laser de baixa intensidade (904nm) influenciou positivamente na regeneração do nervo ciático de ratos da linhagem Wistar pós neuropraxia controlada (axonotmese), tornando a recuperação nervosa mais rápida e eficiente.

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

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.

Aspectos microscópicos do fígado de ratos após administração do óleo de copaíba / Microscopic aspects of the rats liver after copaiba oil administration

A utilização de plantas medicinais é uma prática comumente observada nos países em desenvolvimento. Desta forma objetivou-se verificar os efeitos microscópicos do óleo de copaíba no fígado de ratos. Para tal foram utilizados 50 Rattus norvegicus albinus, machos, distribuídos em cinco grupos: Grupo Copaíba 0,63 (GC0,63 ml/Kg de óleo de copaíba), Grupo copaíba 0,06 (GC0,06 ml/Kg de óleo de copaíba), Grupo Água (GA0,63 ml/kg de água), Grupo milho (GM0,63 ml/Kg de óleo de milho) e grupo Padrão (GP). As substâncias foram administradas diariamente por 14 dias, quando os animais foram submetidos à eutanásia. Os resultados obtidos demonstraram que microscopicamente, não foram encontradas alterações hepatocelulares, porém, foi verificado congestão vascular nas veias portais e centrolobulares, maior no grupo GC0,63 em relação aos grupos GC0,06, GM, GA e GP (<0,05). Já no grupo GC0,06, apesar de não haver diferença estatística, foi observado congestão em maior intensidade que nos grupos GM, GA e GP (p>0,05) o que sugere haver uma relação dose dependente. Os autores concluem que, de acordo com a metodologia empregada, o óleo de copaíba tanto na dose de 0,06 ml/kg como de 0,63 ml/kg foi capaz de promover congestão vascular no fígado de ratos, sugerindo ação dose dependente.