RESUMO
La deficiencia de zinc puede ser un factor mediador en los trastornos del crecimiento fetal en la descendencia de la gestante diabética. Se persiguió como objetivo determinar la influencia de un suplemento con zinc sobre la morfometría externa corporal y craneofacial en fetos de ratas diabéticas con hiperglucemias moderadas. Durante la gestación, ratas diabéticas y controles fueron suplementadas por vía oral con sulfato de zinc (50 mg/kg-pc) o no recibieron tratamiento. Los fetos descendientes del grupo diabético suplementado presentaron niveles similares a los controles en las variables de crecimiento somático determinadas. La suplementación con zinc a ratas diabéticas favoreció el crecimiento intrauterino en los fetos. Los resultados de esta investigación constituyen aportes para dilucidar los requerimientos de zinc que permitan prevenir los trastornos del crecimiento fetal en la descendencia de gestantes diabéticas.
Zinc deficiency may be a mediating factor in fetal growth disorders in the offspring of diabetic pregnant women. The objective was to determine the influence of a zinc supplement on external body and craniofacial morphometry in diabetic rat fetuses with moderate hyperglycemia. During gestation, diabetic and control rats were orally supplemented with zinc sulphate (50 mg/kg bw) or received no treatment. The fetuses descendants of the supplemented diabetic group had levels similar to the control ones in the determined somatic growth variables. Zinc supplementation to diabetic rats favoured intrauterine growth in fetuses. The results of this research constitute a contribution to elucidate zinc requirements that allow preventing fetal growth disorders in the offspring of diabetic pregnant women.
Assuntos
Diabetes Mellitus Experimental , Zinco , Retardo do Crescimento FetalRESUMO
Resumen OBJETIVOS: Determinar la repercusión de la diabetes pregestacional, con hiperglucemias moderadas, en el rendimiento reproductivo de la rata, crecimiento, desarrollo y morfología embrionaria en ratas Wistar. MATERIALES Y MÉTODOS: Estudio longitudinal, prospectivo y experimental efectuado en la Unidad de Investigaciones Biomédicas de la Universidad de Ciencias Médicas de Villa Clara, Cuba, en un modelo de diabetes moderada inducida neonatalmente a crías hembras de ratas Wistar de dos días de nacidas mediante la administración subcutánea de 100 mg/kg de peso corporal de estreptozotocina en una única dosis. A los 120 días de nacidas, las ratas de ambos grupos de experimentación (diabético y control) se aparearon con machos sanos. Se determinaron el peso y la glucemia durante la gestación y a los 11.5 días se practicó la cesárea. Se analizaron las variables del rendimiento reproductivo materno y de crecimiento, desarrollo y morfología externa en los embriones. Acorde con los desenlaces se utilizaron pruebas no paramétricas para el análisis de las variables cuantitativas y la prueba de χ2 para las variables cualitativas. RESULTADOS: La hiperglucemia moderada pregestacional provocó modificaciones en la ganancia de peso de la madre, la cantidad de reabsorciones, sitios de implantación, pérdidas preimplantación y eficiencia de implantación, así como en la morfología, talla y cantidad de somitas en los embriones. CONCLUSIONES: La diabetes moderada pregestacional alteró el rendimiento reproductivo materno y el crecimiento y desarrollo intrauterino de la descendencia en etapa embrionaria. La embriopatía diabética se manifestó, además, con malformaciones del sistema nervioso central.
Abstract OBJECTIVES: Diabetes mellitus is one of the most frequent disorders of pregnancy with adverse consequences for the mother and a high risk of diabetic embryopathy in the offspring. The objective of the research was to determine the effect of pregestational diabetes with moderate hyperglycemia on maternal reproductive performance, growth, development and embryonic morphology in Wistar rats. MATERIALS AND METHODS: Longitudinal, prospective and experimental study carried out at the Biomedical Research Unit of the University of Medical Sciences of Villa Clara, Cuba. A model of neonatally induced moderate diabetes was used in female Wistar rat pups two days old, by subcutaneous administration of 100 mg/kg of body weight of streptozotocin in a single dose. At 120 days after birth, rats from both experimental groups (diabetic and control) were mated with healthy males. Weight and glycemia were determined during pregnancy and at 11,5 days the cesarean section was performed. The variables of maternal reproductive performance and of growth, development and external morphology in the embryos were analyzed. According to the results, non-parametric tests were used for the analysis of the quantitative variables and the Chi-square test for the qualitative variables. RESULTS: Moderate pregestational diabetes caused changes in maternal weight gain, number of resorptions, implantation sites, preimplantation loss, and implantation efficiency, as well as in morphology, size, and number of somites in embryos. CONCLUSIONS: Moderate pregestational diabetes altered maternal reproductive performance and intrauterine growth and development of embryonic offspring. Diabetic embryopathy was also manifested by malformations of the central nervous system.
RESUMO
RESUMEN Introducción: La relación entre la deficiencia de Zn y la elevada incidencia de alteraciones en el crecimiento intrauterino en la diabetes materna aún no se ha dilucidado. En la literatura consultada no existen reportes del efecto de la suplementación con el micronutriente sobre el crecimiento fetal en modelos de diabetes con hiperglucemias moderadas. Objetivo: Determinar el efecto sobre el peso fetal de la suplementación con zinc a ratas con diabetes moderada durante la gestación. Métodos: Se utilizó un modelo de diabetes moderada inducida en ratas Wistar al segundo día de nacidas por inducción subcutánea con estreptozotocina (100mg/kg-pc). En la adultez las ratas sanas y diabéticas fueron apareadas con machos sanos. Según correspondiera recibieron durante 20 días de gestación un suplemento de sulfato de zinc (50mg/kg). Se estudiaron 395 fetos de cuatro grupos: fetos de ratas sanas sin suplemento, de ratas sanas suplementadas, de ratas diabéticas sin suplemento y de ratas diabéticas suplementadas. Los fetos se clasificaron en pequeños (PEG), adecuados (AEG) y grandes (GEG) para la edad gestacional. Resultados: La descendencia de las ratas diabéticas suplementadas mostró valores del peso fetal similares a ambos grupos sanos al término de la gestación, presentando menor porcentaje de fetos PEG y GEG, así como mayor porcentaje de AEG respecto al grupo diabético no suplementado. Conclusiones: La suplementación con Zn durante la gestación a ratas diabéticas con hiperglucemias moderadas causó efectos positivos sobre su descendencia al aumentar el porcentaje de fetos con peso adecuado.
ABSTRACT Introduction: the relationship between Zn deficiency and the high incidence of abnormal intrauterine growth in maternal diabetes has not yet been elucidated. There are no reports in the consulted literature of the effect of micronutrient supplementation on fetal growth in models of diabetes with moderate hyperglycemia. Objective: to determine the effect of zinc supplementation on fetal weight in rats with moderate diabetes during pregnancy. Methods: a model of mild diabetes was used in Wistar rats on the second day of birth by subcutaneous streptozotocin induction (100mg/kg-bw). As adults, healthy and diabetic rats were mated with healthy males. As appropriate, they received a zinc sulfate supplement (50mg/kg) during 20 days of gestation. A number of 395 fetuses from four groups were studied: fetuses from healthy rats without supplementation, from healthy rats supplemented, from diabetic rats without supplementation and from diabetic rats supplemented. Fetuses were classified as small (SGA), adequate (AGA), and large (LGA) for gestational age. Results: the offspring of the supplemented diabetic rats showed similar fetal weight values to both healthy groups at the end of pregnancy, having a lower percentage of SGA and LGA fetuses, as well as a higher percentage of AGA compared to the non-supplemented diabetic group. Conclusions: Zn supplementation during pregnancy in diabetic rats with moderate hyperglycemia had positive effects on their offspring by increasing the percentage of fetuses with adequate weight.
Assuntos
Peso Fetal , Diabetes Mellitus Experimental , Deficiência de ZincoRESUMO
Analizar la incidencia de factores que influyen en complicaciones de diabetes mellitus tipo II del Hospital IESS Latacunga. Método: Descriptiva observacional. Resultados: El 44% de las personas que padecen diabetes también presentan hipertensión, el 18% menciona que presenta colesterol alto, el 8 % colesterol bajo, el 28% triglicéridos altos y el 2% restante afirma tener los triglicéridos bajos. Conclusión: El género con mayor incidencia de la enfermedad es el femenino a una edad superior a los 50 años; en su mayoría los parecientes se aplican regularmente la insulina y los olvidos son considerados como frecuentes; además, las personas que presentan diabetes tienden a padecer adicionalmente hipertensión y triglicéridos altos, y el consumo excesivo de azúcar puede llegar a ocasionarles frecuentes visitas al hospital.
Objective: To analyze the incidence of factors influencing complications of type II diabetes mellitus in the Hospital IESS Latacunga. Methods: Descriptive observational study. Results: 44% of people with diabetes also have hypertension, 18% mentioned high cholesterol, 8% low cholesterol, 28% high triglycerides and the remaining 2% said they had low triglycerides. Conclusion: The gender with the highest incidence of the disease is female at an age above 50 years; the majority of the parecientes apply insulin regularly and forgetfulness is considered frequent; in addition, people with diabetes tend to additionally suffer from hypertension and high triglycerides, and the excessive consumption of sugar can cause them to have frequent hospital visits.
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Introducción: Debido a sus propiedades químicas, la estreptozotocina es uno de los agentes diabetogénicos más utilizados para generar modelos biológicos de diabetes, por lo que es necesario estudiar cuáles son sus efectos en el organismo del animal de laboratorio. Objetivo: Evaluar, en un periodo de 90 días, los efectos de la inyección neonatal de estreptozotocina en ratas Wistar sobre indicadores bioquímicos y de estrés oxidativo en hígado y riñón. Métodos: La diabetes fue inducida neonatalmente por 100 mg de estreptozotocina en ratas Wistar. Se realizaron determinaciones de glucemia, insulina e indicadores de estrés oxidativos en hígado y riñón en cinco animales por grupo a los días 5, 10, 20, 30, 60, 90 de nacidos. Resultados: En todas las intervenciones, la glucemia e insulina mostraron diferencias significativas en el grupo-STZ respecto al control. El valor máximo de hiperglucemia se observó al quinto día. La concentración de nitratos y nitritos en hígado fue mayor que en riñón. En comparación con el grupo control, en el tejido hepático del grupo-STZ la concentración de nitratos y nitritos resultó significativamente superior los días 10-20. En todas las intervenciones se detectó consumo de glutatión reducido en ambos órganos. En el hígado de las ratas STZ no se demostró daño a lípidos ni proteínas; sin embargo, en riñón se detectó daño significativo en ambas biomoléculas al quinto día. Conclusiones: Tanto la citotoxicidad de la estreptozotocina neonatal como las concentraciones de glucosa e insulina inducidas repercutieron negativamente sobre los indicadores de estrés oxidativo estudiados en tejido hepático y renal(AU)
Introduction: Streptozotocin is currently one of the most used diabetogenic agents to generate biological models of diabetes due to its chemical properties, so it is necessary to study the consequences of STZ for the organism of the laboratory animal. Objective: To evaluate in a period of 90 days the effects of neonatal injection of streptozotocin in Wistar rats on biochemical indicators and oxidative stress in liver and kidney. Methods: Diabetes was induced neonatally by 100 mg of streptozotocin in Wistar rats. Blood glucose, insulin and oxidative stress indicators in liver and kidney were determined in 5 animals per group at days 5, 10, 20, 30, 60, 90 of birth. Results: Blood glucose and insulin showed significant differences in the STZ-group respect to the control group in all interventions. The maximum value of hyperglycemia was observed on day-5. The concentration of nitrates and nitrites in liver was higher than in kidney. In liver tissue of the STZ-group, this indicator was significantly higher on days 10-20 compared to the control. In all interventions, reduced glutathione consumption was demonstrated in the STZ-group compared to control in both organs. In the liver of STZ rats no lipid or protein damage was demonstrated. However, in the kidney, significant damage in both biomolecules was detected in the STZ-group on day-5. Conclusions: Neonatal streptozotocin cytotoxicity as well as induced glucose and insulin concentrations had a negative impact on oxidative stress indicators studied in liver and kidney tissue(AU)
Assuntos
Animais , Ratos , Ratos Wistar , Estreptozocina/administração & dosagem , Diabetes Mellitus Experimental/induzido quimicamente , Rim , Fígado , Animais de LaboratórioRESUMO
Resumen Introducción. En la actualidad, la diabetes mellitus representa una de las condiciones médicas que complica el embarazo con mayor frecuencia, lo que afecta el crecimiento y el desarrollo fetal. Objetivo. Determinar las malformaciones esqueléticas y alteraciones en el crecimiento en fetos de ratas Wistar diabéticas. Materiales y métodos. Se utilizó un modelo de diabetes moderada inducida neonatalmente con estreptozotocina (STZ 100 mg/kg de peso corporal, por vía subcutánea) en ratas Wistar. En la adultez, las ratas sanas y diabéticas se aparearon con machos sanos de la misma edad y cepa. El día 20 de gestación se practicó la cesárea bajo anestesia. Se extrajeron los fetos, se pesaron y clasificaron como pequeños (PAG), adecuados (AEG) o grandes (GEG) para la edad gestacional. Los fetos seleccionados se procesaron para el análisis de anomalías esqueléticas y sitios de osificación. Resultados. En la descendencia de las ratas diabéticas, hubo un mayor porcentaje de fetos clasificados como pequeños o grandes y un menor porcentaje de fetos con peso adecuado; el promedio de peso fetal fue menor y había menos sitios de osificación. Se observaron alteraciones en la osificación de cráneo, esternón, columna vertebral, costillas y extremidades anteriores y posteriores; y también, hubo una correlación directa entre el peso y el grado de osificación fetal. Hubo malformaciones congénitas asociadas con la fusión y bifurcación de las costillas, así como cambios indicativos de hidrocefalia, como la forma de domo del cráneo, una amplia distancia entre los parietales y la anchura de las fontanelas anterior y posterior. Conclusión. La diabetes moderada durante la gestación altera el crecimiento y el desarrollo fetal, que se ve afectado tanto por macrosomía y la restricción del crecimiento intrauterino como por malformaciones esqueléticas.
Abstract Introduction: Currently, diabetes mellitus represents one of the medical conditions that more frequently complicates pregnancy affecting the fetus's growth and development. Objective: To determine the skeletal malformations and growth alterations in fetuses of diabetic Wistar rats. Materials and methods: We used a neonatally streptozotocin-induced mild diabetes model (STZ 100 mg/kg body weight - subcutaneously) in Wistar rats. In adulthood, healthy and diabetic rats were mated with healthy males of the same age and strain. On day 20 of gestation, a cesarean was performed under anesthesia. Fetuses were removed, weighed, and classified as small (SPA), adequate (APA), and large (LPA) for the gestational age. Selected fetuses were processed for skeletal anomaly and ossification sites analysis. Results: In the offspring of diabetic rats, there was a higher percentage of fetuses classified as small or large and a lower percentage of fetuses with adequate weight; the fetal weight mean was lower and there were fewer sites of ossification. Alterations were observed in the ossification of the skull, sternum, spine, ribs and fore and hind limbs; and also, there was a direct correlation between fetal weight and ossification degree There were congenital malformations associated with fusion and bifurcation of the ribs, as well as changes indicative of hydrocephaly, such as the dome shape of the skull, a wide distance between parietals, and the width of the anterior and posterior fontanels. Conclusion: Moderate diabetes during pregnancy alters fetal growth and development with macrosomia and intrauterine growth restriction, as well as skeletal malformations.
Assuntos
Diabetes Mellitus Experimental , Retardo do Crescimento Fetal , Anormalidades Congênitas , Macrossomia Fetal , TeratogêneseRESUMO
Diabetes mellitus (DM) is considered a 21st century pandemic and is often associated with cardiovascular disease (CVD). The aim of this integrative review was to analyze the cardioprotective effects of phosdodiesterase-5 (PDE5i) inhibitors in experimental diabetes models. The articles were selected from the PubMed, SciELO and LILACS databases from 2014 to 2019. The following descriptors were used in combination with the Boolean operators: Diabetes mellitus experimental AND Phosphodiesterase 5 inhibitors; Diabetic cardiomyopathies AND Phosphodiesterase 5 inhibitors. An initial sample of 155 articles was obtained, of which six met the criteria for the synthesis of the review. The studies analyzed showed that treatment with PDE5i in experimental models, resulted in positive effects on cardiac function and metabolic parameters. Similar results have also been seen in humans. The reduction in cardiac hypertrophy, apoptosis of cardiomyocytes, pro-inflammatory factors and oxidative stress and the modulation of transcription factors involved in diabetes homeostasis, were prevalent among studies. The mechanisms of action involved in cardioprotection have not yet been fully elucidated, however the restoration of the activated cyclic guanosine monofate (cGMP) pathway by soluble guanylate cyclase (sGC) via nitric oxide (NO) was a common mechanism among the studies.
O Diabetes mellitus (DM) é considerado uma pandemia do século XXI e está frequentemente associado às doenças cardiovasculares (DCVs). O objetivo desta revisão integrativa foi analisar os efeitos cardioprotetores de inibidores da fosdodiesterase 5 (PDE5i) em modelos de diabetes experimental. Os artigos foram selecionados nas bases de dados PubMed, SciElo e LILACS no período de 2014 a 2019. Foram utilizados os seguintes descritores combinados com os operadores booleanos: Diabetes mellitus experimental AND Phosphodiesterase 5 inhibitors; Diabetic cardiomyopathies AND Phosphodiesterase 5 inhibitors. Foi obtida uma amostra inicial de 155 artigos, dos quais seis se enquadraram nos critérios para a síntese da revisão. Os estudos analisados evidenciaram que o tratamento com os PDEi5 em modelos experimentais, resultou em efeitos positivos sobre a função cardíaca e parâmetros metabólicos. Resultados semelhantes também foram observados em humanos. A redução da hipertrofia cardíaca, apoptose de cardiomiócitos, fatores pró-inflamatórios e estresse oxidativo e a modulação de fatores de transcrição envolvidos na homeostasia do diabetes, foram achados prevalentes entre os estudos. Os mecanismos de ação envolvidos na cardioproteção ainda não foram totalmente elucidados, contudo a restauração da via da guanosina monofato cíclica ativada (GMPc) pela Guanilato ciclase solúvel (GCs) via Óxido Nítrico (NO) foi um mecanismo comum entre os estudos.
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Humanos , Diabetes Mellitus Experimental , Cardiomiopatias Diabéticas , Inibidores da Fosfodiesterase 5 , Doenças não TransmissíveisRESUMO
Oxidative stress plays the central role in the pathogenesis and progression of diabetic complications. The present study aims to investigate the beneficial effect of oral administration of flavone baicalein in streptozotocin-nicotinamide (STZ-NA) induced diabetic rats by measuring oxidative stress markers, antioxidant enzyme activities and expression analysis of antioxidant genes. Experimental diabetes was induced by a single intraperitoneal (i.p.) injection of STZ (55 mg /kg b.wt), 15 min after the i.p. administration of NA. At the end of the experimental period, thiobarbituric acid reactive substances (TBARS), activities of antioxidant enzymes and expression levels of superoxide dismutase (SOD), catalase (CAT), glutathione (GSH) and glutathione peroxidase (GPx) were measured in diabetic rats along with serum biochemical parameters namely total cholesterol (TC), total triglyceride (TG), aspartate transaminase (AST) alanine transaminase (ALT) and glycosylated hemoglobin (HbA1c). Oral administration of baicalein (40 mg/kg b.wt/day) demonstrated a significant ameliorative effect on all studied biochemical and oxidative stress parameters. Biochemical findings were corroborated by qPCR expression analysis which showed significant upregulation of antioxidant genes in diabetic rats. These results suggest that baicalein supplementation may reduce diabetes and its complications by suppressing oxidative stress and enhancing gene expression and antioxidant enzyme activities in diabetic rats.
Assuntos
Animais , Masculino , Pré-Escolar , Ratos , Expressão Gênica , Niacinamida/farmacologia , Flavonas/análise , Diabetes Mellitus Experimental/prevenção & controle , Expressão Gênica/efeitos dos fármacos , Glibureto/farmacologia , Estresse Oxidativo , Antioxidantes/farmacologiaRESUMO
Introdução: Diabetes mellitus é uma doença metabólica que afeta vários órgãos-alvo, incluindo os ossos. Objetivo: Avaliar pelo método de esqueletonização o efeito do Diabetes mellitus tipo I (DM1) na microarquitetura de osso esponjoso. Material e métodos: Quatorze ratos Wistar foram divididos em: Saudável (S, n=7) e Diabético (D, n=7). O DM1 foi induzido por meio de injeção endovenosa de estreptozotocina no grupo D, sendo a confirmação da condição realizada por checagem do nível glicêmico. Os animais foram sacrificados após 35 dias da indução no grupo D, juntamente com os do grupo S. As epífises femorais foram seccionadas, removidas, desmineralizadas e incluídas em parafina. Dois cortes (5 µm) foram obtidos, corados em Hematoxilina e Eosina, e analisados ao Microscópio de Luz. Foi realizada a delimitação interativa das trabéculas ósseas, seguido pelo processo de binarização utilizando threshold global, feita por dois operadores distintos. Depois, foi realizado o processo de esqueletonização para acesso às características das trabéculas e da rede de interconexão entre elas. Os parâmetros avaliados foram: Área óssea em micrômetros quadrados (B.Ar, seguido pela proporção em porcentagem BV/TV), Índice de Modelo estrutural (SMI), Dimensão Fractal (FD), Número de trabéculas (Tb.N), Número de ramos (B.N), Número total de junções (Junc.N), Média de pontos terminais (End.p), Média de extensão de cada ramo (R.Le) e Número de junções triplas (Triple.points.N). Resultados: Houve diferença significante apenas no parâmetro SMI para os diferentes operadores (p<0,0001), sendo o mesmo retirado da análise entre diabetes vs saudável. Houve diferença significante na quantidade óssea, sendo maior no grupo S (0,46±0,09) comparado ao grupo D (0,41±0,07) (p=0,0082). Os demais parâmetros não mostraram diferença significante. Conclusão: Conclui-se que a área óssea no grupo saudável é maior em comparação ao DM1. Dentro das limitações deste estudo, parece que a distribuição espacial das trabéculas e suas características de interconexão não são alteradas no diabetes.
Introduction: Diabetes is a metabolic disease that affects several target-organs, including bone. Objective: Analyze the effects of Diabetes Mellitus Type 1 (DM1) on the trabecular bone microarchitecture by using the skeletonization process. Material and methods: Fourteen Wistar rats were divided in two groups: Health (S, n=7) and Diabetic (D, n=7). DM1 was induced with streptozotocin in D group, and glycemic levels were tested on peripheral blood samples. After 35 days, the animals were euthanized and had their femurs removed. The epiphysis were decalcified and embedded in paraffin. Five microns sections were stained in Hematoxylin and Eosin, and analyzed at the light microscope. Bone trabeculae were manually delimited, and then the binarization process with a global threshold was performed for each image. The whole process were conducted by two operators separately. Skeletonization was applied to binary images in order to evaluate the trabeculae characteristics and their network. Bone area (B.Ar), Bone proportion (BV/TV) Strucutre Model Index (SMI), Fractal Dimension (FD), Trabeculae number (Tb.N), Mean branches (B.N), Mean junction points (Junc.N), Mean End-points (End.p), Mean branches length (B.Le), and Mean triple points (Triple.points.N) were evaluated. Results: There was a significant difference only for SMI between different operators (p<0.0001), being this parameter excluded for the evaluation between health and diabetic groups. There was a significant difference between S and D for bone area, with S (0.46±0.09) higher than D (0.41±0.07) (p=0.0082). The other parameters analyzed were not significantly different. Conclusion: Bone trabecular area was higher in health compared with diabetes. Within the limitations of this study, one could suggest that there are no alterations of the spatial distribution of the trabeculae with their network and their inner structural characteristics.
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Animais , Masculino , Ratos , Processamento de Imagem Assistida por Computador/métodos , Diabetes Mellitus/patologia , Diabetes Mellitus Experimental/patologia , Osso Esponjoso/ultraestrutura , Ratos WistarRESUMO
Abstract Purpose: To evaluate the pulmonary oxidative stress in diabetic rats exposed to hyperoxia for 90 minutes. Methods: Forty male Wistar rats were divided into four groups, each one containing 10 animals, according to the oxygen concentration to which they were exposed: 21%, 50%, 75% and 100% (hyperoxia). In each group five animals were randomly induced to diabetes by means of at a dose of 55 mg/kg of streptozotocin (STZ). Results: Seventy two hours after diabetes induction, a significant difference was seen in blood glucose in the experimental groups in comparison with the control. In the experimental groups a significant difference was observed in the concentration of malondialdehyde (MDA) in lung tissue and blood plasma (p<0.05), except the 50% group. In the control group, significant differences in the MDA concentration in plasma and lung tissue were also observed (p<0.05), except the 75% group. The MDA concentration in lung tissue in comparison with the diabetic and non-diabetic groups showed a significant difference in the 21% group; however, no difference was seen in the 75 and 100% groups. Conclusion: In diabetic animals high oxygen concentrations (75 and 100%) do not appear to exert deleterious effects on lipid peroxidation in lung tissue.
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Animais , Masculino , Ratos , Estresse Oxidativo/fisiologia , Hiperóxia/complicações , Diabetes Mellitus Experimental/metabolismo , Pulmão/metabolismo , Fatores de Tempo , Ratos Wistar , Hiperóxia/fisiopatologia , Diabetes Mellitus Experimental/fisiopatologia , Pulmão/fisiopatologia , Pulmão/patologiaRESUMO
PURPOSE:To evaluate metabolic effects in experimental model of glucocorticoid-induced insulin resistance.METHODS:Twenty Wistar male rats were randomly divided into two groups, which were treated with intraperitoneally injected dexamethasone 1mg/Kg/day for ten days consecutively (Group D; n=10) and placebo (Group C; n=10). The variables analyzed were: from the first to the 10th day - body weight (before and after treatment); food and water daily consumption; on the 10th day - glycemia, insulinemia, HOMA-beta and HOMA-IR. The blood samples for laboratory analysis were obtained by intracardiac puncture. Also on the 10th day liver fragments were taken for analyzing glycogen and fattty.RESULTS:Group D animals compared to group C had: weight reduction (g), (D=226.5±24.7 vs C=295.0±25.4; p=0.001); increased glycemia (mmol/l) (D=19.5±2.1 vs C=14.2±3.1; p=0.0001); diminished insulinemia (mU/l) (D=0.2±0.1 vs C=2.0±0.4; p=0.0001); reduced HOMA-β (D=0.2±0.1 vs C=4.2±1.7; p=0.0002); diminished HOMA-IR (D=0.2±0.1 vs C=1.3±0.4; p=0.0002). Histological examination of the liver showed that 100% of group D and none of group C had moderate fatty. (p=0.2).CONCLUSION:Animals treated with glucocorticoid, in this experimental model, expressed hyperglycemia, hypoinsulinism and decreased peripheral insulin sensitivity.(AU)
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Animais , Ratos , Resistência à Insulina , Glucocorticoides , Modelos Animais de Doenças , Dexametasona , Glicogênio Hepático , Fígado Gorduroso/veterinária , Ratos Wistar , Diabetes Mellitus/veterináriaRESUMO
PURPOSE:To evaluate the effects of low intensity ultrasound on the healing process of third degree burn wounds in experimentally induced diabetic Wistar rats.METHODS:One hundred rats were divided into: control group; non-diabetic treated group; diabetic control group; diabetic treated group. The therapy was performed with a 3MHz ultrasound application, pulsed emission at 100Hz frequency, modulated at 20% with a dosage of 0.5W/cm2 during three minutes throughout 30 days. The surgical debridement of the wound was performed once at day 2. The wounds were morphometrically, macroscopically and microscopically evaluated at 3, 7, 14, 21 and 30 days.RESULTS:The wound contraction and collagen quantification were higher in all treated groups. Macroscopically, necrosis was higher in the diabetic control group. Granulation tissue was higher in treated groups during the proliferative and remodeling phase. Microscopically, there were greater mononuclear inflammatory infiltration, angiogenesis and fibroblast quantification in treated groups during the proliferative and remodeling phases.CONCLUSIONS:therapeutic ultrasound is beneficial in the inflammatory and proliferative phases of the healing process because it controlled the necrotic tissue, increased the granulation tissue and wound contraction. However in the remodeling phase it is not beneficial because of the continued angiogenesis and a mononuclear inflammatory infiltration.(AU)
Assuntos
Animais , Ratos , Indutores da Angiogênese , Ultrassonografia , Ultrassonografia/veterinária , Cicatrização , Queimaduras/veterinária , Inflamação/veterinária , Diabetes Mellitus/veterináriaRESUMO
Introducción. El estudio de la diabetes mediante modelos experimentales es fundamental para entender los mecanismos fisiopatológicos de la enfermedad. Objetivos. Comparar en ratas Wistar adultas la acción de inducción de la diabetes de la estreptozotocina según el momento y la vía de inoculación del fármaco durante el periodo neonatal mediante la evaluación de variables bioquímicas, metabólicas e histológicas. Materiales y métodos. Se conformaron ocho grupos con ratas Wistar hembras recién nacidas (n=10). Se evaluó la inducción con estreptozotocina (100 mg/kg de peso corporal) según el día (segundo y quinto después del nacimiento) y la vía de inoculación (subcutánea o intraperitoneal). Los controles se inyectaron con solución tampón de citrato sódico. Durante 12 semanas se evaluaron la glucemia, el peso, y la cantidad de alimento y de agua consumida. Se hicieron pruebas de tolerancia a la glucosa oral, se evaluó la hemoglobina ´glicosilada´, y se hizo el estudio morfométrico e histopatológico del páncreas. Resultados. Casi todos los animales inoculados con estreptozotocina en el quinto día murieron, en tanto que todos los inoculados en el segundo día sobrevivieron. La administración subcutánea de estreptozotocina en el segundo día produjo hiperglucemia, polifagia, polidipsia y disminución de la ganancia de peso corporal, así como alteración de los valores de hemoglobina ´glicosilada´ y en la prueba de tolerancia a la glucosa. Las lesiones histopatológicas del páncreas, así como la disminución del número de islotes, se observaron con mayor frecuencia con la estreptozotocina aplicada de forma subcutánea en el segundo día, lo cual corroboró que el efecto de este agente inoculado de forma subcutánea causa mayor daño. Conclusiones. La inyección subcutánea de una dosis de 100 mg/kg de estreptozotocina en el segundo día después del nacimiento logró mayor efectividad en la inducción de diabetes moderada en ratas Wistar adultas.
Introduction: The use of experimental models is essential to study the pathophysiological mechanisms of diabetes. Objectives: To compare in adult Wistar rats the diabetogenic action of streptozotocin according to the moment and route of administration during the neonatal period by evaluating biochemical, metabolic and histological variables. Materials and methods: Eight groups of neonatal female Wistar rats (n=10) were formed. We evaluated the induction with streptozotocin (100 mg/kg of body weight) on days 2 and 5 after birth, as well as the administration routes (subcutaneous or intraperitoneal). Controls were injected with sodium citrate buffer. Blood glucose level, body weight, food and water intake were monitored for 12 weeks. We also performed tolerance tests for oral glucose and glycosylated hemoglobin, and a histopathological pancreas morphometric study. Results: The mortality rate was about 100% among rats given streptozotocin on their fifth day of life. All rats receiving the drug on day 2 of life survived, and they showed a marked hyperglycemia, polyphagia, polydipsia and decreased body weight gain in addition to increased glycosylated hemoglobin rates and impaired results in the oral glucose tolerance test. Histopathological lesions of the pancreas as well as a decreased number of islets were significantly more frequent in rats receiving the drug subcutaneously on day 2, which confirms that streptozotocin administered subcutaneously produces greater damage. Conclusions: Subcutaneous injection of streptozotocin in a dose of 100 mg/kg of body weight in the second day after birth induced moderate diabetes in adult Wistar rats more effectively.
Assuntos
Diabetes Mellitus Experimental , Estreptozocina , Glucose , Hiperglicemia , Ilhotas Pancreáticas , RatosRESUMO
Objetivo: Determinar el efecto del extracto acuoso liofilizado de Tabebuia obscura (Bureau & Schumann) Sandwith (tahuari oscuro) en los valores de glicemia en ratas con diabetes inducida experimentalmente. Materiales y métodos: Se indujo diabetes experimental con aloxano a 24 ratas macho Holtzman, las cuales fueron distribuidas en cuatro grupos de seis ratas cada uno. El Grupo I recibió 3 mL de agua destilada (control); el Grupo II: glibenclamide 10 mg/kg (control positivo); el Grupo III: Tabebuia obscura 100 mg/kg, y el Grupo IV: Tabebuia obscura 200 mg/kg. Se determinó la glicemia antes y después de la inducción con aloxano. Luego, se evaluó a la 1 h, 3 h, 6 h, 12 h y 24 h después de administrar las intervenciones. Resultados: Se encontraron diferencias significativas (p<0,05) en los promedios, y se encontró correlación lineal en los valores de glicemia de los grupos II, III y IV. El grupo III y el grupo II tuvieron desempeños similares (p=0,456) en lograr disminuir la glicemia; con un coeiciente de correlación intraclase de 0,70. Conclusiones: El extracto acuoso lioilizado de Tabebuia obscura en dosis de 100 mg/kg tiene un efecto hipoglicemiante similar a la glibeclamide a 10 mg/kg en ratas Holtzman macho con diabetes experimental inducida por aloxano.
Assuntos
Animais , Ratos , Extratos Vegetais/uso terapêutico , Hipoglicemiantes/administração & dosagem , Extratos Vegetais/síntese química , Modelos AnimaisRESUMO
Neste trabalho, foi avaliado a participação dos osteoclastos bem como a ação das citocinas RANKL, OPG e TNF-α durante a formação e remodelação óssea em defeitos ósseos de tamanho crítico em ratos normoglicêmicos e diabéticos tratados ou não com a MAOD. Para isso, foram utilizados 250 ratos machos Wistar. Trinta ratos foram utilizados para coleta dos fêmures e tíbias, os quais foram processados para obtenção da MAOD. Os demais 220 ratos foram divididos em Grupo Não Diabétido (CTL, n=110) e Grupo Diabético (DIAB, n= 110) induzido pela aplicação de uma dose única de 47 mg/Kg de massa corporal de estreptozotocina. Um defeito transósseo de 8 mm de diâmetro foi realizado nos ossos parietais dos ratos, sendo que, nos subgrupos CTL MAOD e DIAB MAOD, os defeitos foram preenchidos com MAOD e nos grupos CTL COAG e DIAB COAG apenas com coágulo sanguíneo. Após 0, 7, 14, 21 e 42 dias, as calotas cranianas foram coletadas para determinação da densidade de volume, número de osteoclastos/mm2 na área do defeito, quantificação por imunoistoquimica e expressão do RNAm para as proteínas RANKL, OPG e TNF-α. Os resultados para volume do tecido ósseo neoformado foi maior nos grupos CTL COAG e CTL MAOD, bem como no grupo DIAB MAOD quando comparado com DIAB COAG (CTL MAOD > CTL COAG e DIAB MAOD > DIAB COAG). O número de osteoclastos nos grupos CTL aumentaram significantemente (3,69 osteoclasto/mm2), enquanto que nos grupos MAOD aumentaram gradualmente até os 42 dias (2,8 osteoclasto/mm2). Os resultados para imunomarcação mostraram que a MAOD promove 1,28 vezes maior expressão de OPG, bem como de TNF-α tanto no grupo CTL (1,59 vezes) como no DIAB (1,76 vezes). Os resultados para expressão do RNAm para OPG mostrou que a média dos valores do grupo COAG comparado com a do grupo MAOD foi 1,91 vezes maior no grupo COAG. Já os valores para expressão de RANKL permaneceram constantes no grupo DIAB MAOD, com aumento significativo de 2,57 vezes aos 42 dias, sendo 4,3 vezes maior, quando comparado com a média dos outros grupos no mesmo período. Conclui-se que nos animais normoglicemicos, o tratamento com a MAOD aumenta a expressão de OPG, RANKL e TNF-α, assim como a atividade osteoclástica, promovendo reabsorção da MAOD e formação de tecido ósseo, enquanto que nos animais diabéticos, a atividade osteoclástica foi reduzida, sem alteração nos níveis de OPG e RANKL, reduzindo a reabsorção da MAOD e consequentemente da formação óssea.(AU)
Participation of osteoclasts was evaluated in reabsorption process of demineralized allogenic bone matrix (DABM) as well as the activity of cytokines RANKL, OPG and TNF- α during formation and bone remodeling in critial size defect of normoglycemic and diabetic rats treated or not with DABM. Therefore, 250 male Wistar rats were used. Thirty rats had femurs and tibias collected and processed to obtain DABM. 220 rats were divided into control group (CTL, n=110) and diabetic group (DIAB, n= 110) injected by a single dose of 47 mg/Kg of body weight streptozotocin. Were made 8mm bone defect on skulls of rats, in subgroups CTL DABM and DIAB DABM, defects were filled with DABM and subgroups CTL CLOT and DIAB CLOT were filled with blood clot. After 0, 7, 14, 21 and 42 days, the skulls were collected to determine the volume density, number of osteoclasts/mm2 into defects area, quantification by immunohistochemistry and RNAm expression of RANKL, OPG and TNF-α cytokines. The results of volume density of newly formed bone was higher in CTL CLOT and CTL DABM, as well as in DIAB DABM compared to DIAB CLOT (CTL DABM > CTL CLOT and DIAB DABM > DIAB CLOT). The number of osteoclasts in CTL groups increased to 3,69 osteoclasts/mm2, while in subgroups treated with DABM gradually increased up until 42 days (2,8 osteoclasts/mm2). Immunohistochemistry showed that DABM promotes an increase of 1.28-fold of OPG expression, as well as TNF-a expression in CTL group (1.59-fold) and DIAB group (1.76-fold). The results of RNAm expression of OPG showed that the average values of the CLOT subgroup compared to the average values of DABM subgroup was 1.91- fold higher in CLOT subgroup. The values of RANKL RNAm expression increase 2.57-fold at 42 days, being 4.3-fold higher than the average os the other groups in the same period. In conclusion, in the normoglicemic animals (CTL group), the treatment with DABM increase the expression of OPG, RANKL and TNF-α as the activity of osteoclasts, leading to DABM resorption and bone tissue formation, while in diabetic animals, the osteoclast activity was reduced, without changes in the leves of OPG and RANKL, decreasing DABM resorption and bone formation.(AU)
Assuntos
Animais , Masculino , Ratos , Matriz Óssea/fisiologia , Regeneração Óssea/fisiologia , Diabetes Mellitus Experimental/fisiopatologia , Osteoclastos/fisiologia , Osteoprotegerina/análise , Ligante RANK/análise , Fator de Necrose Tumoral alfa/análise , Substitutos Ósseos/uso terapêutico , Imuno-Histoquímica , Osteogênese/fisiologia , Ratos Wistar , Reprodutibilidade dos Testes , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Crânio/fisiologia , Fatores de TempoRESUMO
Objective To re-examine the function of the urinary bladder in vivoas well as to determine the functional and biochemical characteristics of bladder muscarinic receptors in long-term alloxan-induced diabetes rats.Methods Two-month-old male Wistar rats were injected with alloxan and the animals showing blood glucose levels >300mg/dL together with age-paired untreated animals were kept for 11 months. Body weight, bladder weight, blood glucose, and urinary volume over a period of 24 hours were determined in both groups of animals. A voiding cystometry in conscious control and diabetic rats was performed to determine maximal micturition pressure, micturition contraction interval and duration as well as voided and post-voiding residual volume. In addition, concentration-response curves for bethanechol in isolated bladder strips, as well as [3H]-N methyl-scopolamine binding site characteristics in bladder homogenates were determined.Results Mean bladder weight was 162.5±21.2mg versus 290±37.9mg in control and treated animals, respectively (p<0.05). Micturition contraction amplitude (34.6±4.7mmHg versus 49.6±2.5mmHg), duration (14.5±1.7 seconds versus 23.33±4.6 seconds) and interval (87.5±17.02 seconds versus 281.11±20.24 seconds) were significantly greater in alloxan diabetic rats. Voided urine volume per micturition contraction was also significantly higher in diabetic animals. However the post-voiding residual volume was not statistically different. Bethanechol potency (EC50 3µM versus 5µM) and maximal effect (31.2±5.9g/g versus 36.1±6.8g/g) in isolated bladder strips as well as number (169±4fmol/mg versus 176±3fmol/mg protein) and affinity (0.69±0.1nM versus 0.57±0.1nM) of bladder muscarinic receptors were also not statistically different.Conclusion Bladder function in vivo is altered in chronic alloxan-induced diabetes rats without changes in functional and biochemical characteristics of bladder muscarinic receptors.
Objetivo Reestudar o funcionamento da bexiga in vivo e determinar as características funcionais e bioquímicas dos receptores muscarínicos vesicais de ratos com diabetes crônico induzido por aloxana.Métodos Ratos Wistar de dois meses de idade receberam injeção de aloxana, e os animais que apresentaram glicemia >300mg/dL foram mantidos por 11 meses junto de outros não tratados e pareados por idade. Nos dois grupos de animais, peso corpóreo, peso da bexiga, glicemia e volume urinário de 24 horas foram medidos. Em ambos os grupos, realizou-se a cistometria miccional em animais não anestesiados. Foram determinados os seguintes parâmetros: pressão máxima de micção, intervalo e contração de micção, bem como o volume de esvaziamento e o volume residual pós-miccional. Além disso, foram determinadas as curvas de concentração-resposta a betanecol em preparações isoladas de bexiga e também as características dos sítios de ligação da [3H]-N-metil-escopolamina em homogenatos de bexiga.Resultados O peso médio da bexiga foi de 162,5±21,2mg versus290±37,9mg nos animais controles e tratados, respectivamente (p<0,05). A amplitude de contração (34,6±4,7mmHg versus 49,6±2,5mmHg), a duração (14,5±1,7 segundos versus 23,33±4,6 segundos) e o intervalo (87,5±17,02 segundos versus 281,11±20,24 segundos) de micção foram significantemente maiores nos ratos tratados com aloxana. O volume de urina eliminada durante a contração miccional também foi maior nos animais diabéticos. Contudo, o volume residual pós-miccional não foi estatisticamente diferente. Não foram observadas diferenças na resposta ao betanecol (EC50 3µM versus 5µM) e no seu efeito máximo (31,2±5,9g/g versus 36,1±6,8g/g) em preparações isoladas de bexiga, bem como no número total (169±43fmol/mgversus 176±3fmol/mg) e na afinidade (0,69±0,1nMversus 0,57±0,1nM) dos receptores muscarínicos da bexiga.Conclusão O funcionamento da bexiga in vivo está alterado no diabetes crônico induzido por aloxana, porém sem alterações funcionais e bioquímicas nos receptores muscarínicos da bexiga.
Assuntos
Animais , Masculino , Diabetes Mellitus Experimental/metabolismo , Receptores Muscarínicos/metabolismo , Bexiga Urinária/metabolismo , Aloxano/administração & dosagem , Betanecol/administração & dosagem , Modelos Animais de Doenças , Relação Dose-Resposta a Droga , Diabetes Mellitus Experimental/induzido quimicamente , Contração Muscular/efeitos dos fármacos , Contração Muscular/fisiologia , N-Metilescopolamina/administração & dosagem , Ratos Wistar , Receptores Muscarínicos/efeitos dos fármacos , Fatores de Tempo , Bexiga Urinária/efeitos dos fármacos , Bexiga Urinária/fisiopatologia , Micção/efeitos dos fármacos , Micção/fisiologiaRESUMO
Objective To evaluate the effect of maternal diabetes on the blood pressure and kidney function of female offspring, as well as if such changes exacerbate during pregnancy. Methods Diabetes mellitus was induced in female rats with the administration of streptozotocin in a single dose, one week before mating. During pregnancy, blood pressure was measured through plethysmography. On the 20th day of pregnancy, the animals were placed for 24 hours in metabolic cages to obtain urine samples. After the animals were removed from the cages, blood samples were withdrawn. One month after pregnancy, new blood and urine sample were collected. Kidney function was evaluated through proteinuria, plasma urea, plasma creatinine, creatinine excretion rate, urinary flow, and creatinine clearance. Results The female offspring from diabetic mothers showed an increase in blood pressure, and a decrease in glomerular filtration rate in relation to the control group. Conclusion Hyperglycemia during pregnancy was capable of causing an increase in blood pressure and kidney dysfunction in the female offspring. .
Objetivo Avaliar o efeito do diabetes materno sobre a pressão arterial e a função renal da prole feminina, bem como verificar se as alterações observadas se exacerbam durante a prenhez. Métodos O diabetes mellitus foi induzido em ratas com a administração de estreptozocina em dose única, uma semana antes do cruzamento. Durante a prenhez, foram feitas medidas da pressão arterial por pletismografia. No 20o dia da prenhez, os animais foram colocados durante 24 horas em gaiolas metabólicas para obtenção de amostras de urina. Após a retirada dos animais das gaiolas, foram obtidas amostras de sangue. Um mês após a prenhez, foram obtidas novas amostras de sangue e urina para as determinações. A função renal foi avaliada por meio de proteinúria, ureia plasmática, creatinina plasmática, carga excretada de creatinina, fluxo urinário e clearance de creatinina. Resultados As fêmeas da prole de mães diabéticas apresentaram elevação da pressão arterial e redução do ritmo de filtração glomerular em relação ao grupo controle. Conclusão A hiperglicemia durante a gestação foi capaz de causar elevação da pressão arterial e disfunção renal na prole de sexo feminino. .
Assuntos
Animais , Feminino , Gravidez , Diabetes Mellitus Experimental/complicações , Nefropatias Diabéticas/etiologia , Hipertensão/etiologia , Gravidez em Diabéticas , Efeitos Tardios da Exposição Pré-Natal/etiologia , Creatinina/sangue , Modelos Animais de Doenças , Diabetes Mellitus Experimental/induzido quimicamente , Diabetes Mellitus Experimental/metabolismo , Nefropatias Diabéticas/fisiopatologia , Idade Gestacional , Taxa de Filtração Glomerular , Hiperglicemia/complicações , Hipertensão/fisiopatologia , Rim/fisiopatologia , Gravidez em Diabéticas/metabolismo , Efeitos Tardios da Exposição Pré-Natal/fisiopatologia , Proteinúria/urina , Ratos Wistar , Valores de Referência , Estreptozocina , Fatores de Tempo , Ureia/sangueRESUMO
Objetivos . Determinar si el extracto acuoso liofilizado de Geranium ayavacense (Pasuchaca) tiene algún efecto sobre la glicemia en ratas con diabetes mellitus experimental. Materiales y métodos. La diabetes experimental fue inducida con aloxano. Las ratas cumplieron los criterios: glicemia > 200 mg/dL posadministración de aloxano y un peso > 200 g. Las ratas con diabetes experimental fueron distribuidas en seis grupos de ocho ratas cada uno. El grupo I recibió 3 mL de agua destilada (control); el grupo II recibió Geranium ayavacense 12,7 mg/kg; el grupo III recibió Geranium ayavacense 100 mg/kg; el grupo IV recibió Geranium ayavacense 200 mg/kg; el grupo V recibió Geranium ayavacense 300 mg/kg; el grupo VI recibió Geranium ayavacense 500 mg/kg. Se determinó la glicemia basal. Las evaluaciones de la glicemia se realizaron a la 1.ª, 3.ª, 6.ª, 12.ª y 24ª hora después de administrar las diferentes intervenciones. Resultados. Los grupos de Geranium ayavacense de 300 y 500 mg/kg disminuyeron significativamente (p<0,01) la glicemia en todas las horas evaluadas después de la administración de los extractos, cuando se compara con el grupo control. El grupo de Geranium ayavacense de 300 mg/kg decreció su glucosa sanguínea en 8,14; 10,68; 14,87; 19.36 y 23,7% a la 1.ª, 3.ª, 6.ª, 12.ª y 24.ª hora respectivamente. Conclusiones. En condiciones experimentales, el extracto acuoso de Geranium ayavacense tiene efecto hipoglicemiante en ratas.
Objectives . To determine if the lyophilized aqueous extract of Geranium ayavacense (Pasuchaca) has any effect on glycemia in rats with experimental diabetes mellitus. Materials and methods. Experimental diabetes was induced with alloxan. Rats included in the study met the following criteria: glycemia greater than 200 mg/dL post administration of alloxan, and with a weight greater than 200 g. Rats with experimental diabetes were divided into six groups of eight rats each. Group I received 3 mL of distilled water (control); group II received Geranium ayavacense 12.7 mg/kg; group III received Geranium ayavacense 100 mg/kg; group IV received Geranium ayavacense 200 mg/kg; group V received Geranium ayavacense 300 mg/kg; group VI received Geranium ayavacense 500 mg/kg. Basal glycemia was determined. Glycemia evaluations were performed at the 1st, 3rd, 6th, 12th and 24th hour after administrating the different interventions. Results. Geranium ayavacense groups of 300 and 500 mg/kg decreased glycemia significantly (p <0.01) in every hour assessed after administration of the extract, when compared with the control group. Geranium ayavacense group of 300 mg/kg decreased their blood glucose 8.14; 10.68; 14.87; 19.36 and 23.7% in the 1st, 3rd, 6th, 12th and 24th hour respectively. Conclusions. Under experimental conditions, the aqueous extract of Geranium ayavacense has hypoglycemic effects in rats.
Assuntos
Animais , Masculino , Ratos , Glicemia/análise , Glicemia/efeitos dos fármacos , Diabetes Mellitus Experimental/sangue , Diabetes Mellitus Experimental/tratamento farmacológico , Geranium , Fitoterapia , Extratos Vegetais/farmacologia , Extratos Vegetais/uso terapêuticoRESUMO
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, diabetic rats were not different from control ones.