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1.
Eur. j. anat ; 24(2): 135-140, mar. 2020. graf
Artigo em Inglês | IBECS | ID: ibc-191241

RESUMO

The bariatric surgery techniques applied in patients with obesity have reported a great ability to improve Type 2 Diabetes mellitus (T2DM). Some published data report an increasing betacell mass in some surgical processes. This mechanism was specially seen in the bariatric surgeries which affect the length of the small bowel. The intrinsic mechanism that links both phenomena seemed to be related to the enterohormonal secretion pattern. Many enteral hormones have been invoked as the effector of these mechanisms. Previous reports focused on the medial portion of jejunum, as the precise place in which some particular enterohormones determine the homeostatic glycemic improvement. Goto-Kakizaki diabetic male rats underwent surgery to exclude the 50% medial jejunum from the normal nutrients flow. This medial portion of jejunum was not resected, but anastomosed by both extremes to the abdominal wall, and a stoma was performed. This surgery wasnamed as Medial Jejunal Exclusion (MJE). We studied the functional parameters in a three-month survival period. In this sense basal glycaemia, weight increase and food intake were not modified between the surgical and control groups. The study presented a mortality of the 24%. This model was designed for the late study of serum and enterohormones release in this jejunal portion, excluded of nutrients flow. We report a new surgical technique, which appears to balance the homeostatic processes in order to maintain the survival of diabetic rats. Thus, this mechanism could be in the basis of T2DM improvement, and this novel surgical model will help study this precise portion of jejunum


No disponible


Assuntos
Animais , Masculino , Ratos , Jejuno/cirurgia , Cirurgia Bariátrica/métodos , Diabetes Mellitus Tipo 2 , Diabetes Mellitus Experimental , Fatores de Tempo , Modelos Animais
3.
Nefrología (Madrid) ; 39(4): 411-423, jul.-ago. 2019. graf, ilus, tab
Artigo em Inglês | IBECS | ID: ibc-189763

RESUMO

BACKGROUND: Ischemia-reperfusion injury causes various severe morphological and functional changes in diabetic patients. To date, numerous antidiabetic and antioxidant agents have been used for treatment of the disease-related changes. OBJECTIVES: We aimed to examine effective therapeutic doses or doses of berberine against renal ischemia/reperfusion injury (IRI) in a streptozotocin (STZ)-induced diabetic rat model by histopathological and biochemical analysis. METHODS: Thirty male Sprague Dawley rats were treated with STZ injection for the development of diabetes, and divided into the following groups: STZ-induced diabetic group (STZ); IRI-induced diabetic group (STZ + IRI); 50 mg/kg berberine (BRB) treated diabetic group after inducing IRI (STZ + IRI + BRB1); 100 mg/kg BRB treated diabetic group after IRI (STZ + IRI + BRB2); 150 mg/kg BRB treated diabetic group after IRI (STZ + IRI + BRB3). Bilateral renal ischemia model was applied for 45min, then reperfusion was allowed for 14 days in STZ-induced diabetic rats. Renal injury was detected histopathologically. Blood urea nitrogen (BUN), creatinine and lactate dehydrogenase (LDH) levels were measured in serum using the ELISA method. Total antioxidant status (TAS) and total oxidant status (TOS) of renal tissue was studied by spectrophotometric assay. Oxidative stress index (OSI) was calculated as TOS-to-TAS ratio. Tumor necrosis factor alpha (TNF-alfa), C-reactive protein (CRP), Na+/K+-ATPase (sodium pump), and Ca2+-ATPase (calcium ATPase) enzyme levels were measured in tissues using the ELISA method. Anti-apoptotic Bax and pro-apoptotic Bcl-2 protein levels were detected by Western blot analysis. All data were evaluated statistically...


ANTECEDENTES: La reperfusión de la isquemia provoca graves cambios morfológicos y funcionales en los pacientes diabéticos. Hasta la fecha numerosos antidiabéticos y agentes antioxidantes han sido utilizados para el tratamiento de los cambios relacionados con la enfermedad. OBJETIVOS: El objetivo fue examinar las dosis terapéuticas efectivas o las dosis de berberina (BRB) frente a la insuficiencia renal por isquemia/reperfusión (IRI) en estreptozotocina (STZ) inducida por el modelo de rata por análisis histopatológico y bioquímico. MÉTODOS: Treinta ratas machos Spraque-Dawley fueron tratadas con inyección de STZ para el desarrollo de diabetes, se dividieron en los siguientes grupos: grupo diabético inducido por STZ; grupo diabético inducido por IRI (STZ + IRI); grupo diabético tratado con 50 mg/kg de BRB después de la inducción de IRI (STZ + IRI + BRB1); grupo diabético tratado con 100 mg/kg de BRB después de IRI (STZ + IRI + BRB2), y grupo diabético tratado con 150 mg/kg de BRB después de IRI (STZ + IRI + BRB3). Se aplicó un modelo de isquemia renal bilateral durante 45min, luego se permitió la reperfusión durante 14 días en ratas diabéticas inducidas por STZ. La lesión renal fue detectada histopatológicamente. Los niveles de nitrógeno ureico en sangre (BUN), creatinina y lactato deshidrogenasa (LDH) se midieron en suero por el método ELISA. El estado antioxidante total (TAS) y el estado oxidante total (TOS) del tejido renal se estudiaron mediante un ensayo espectrofotométrico. El índice de estrés oxidativo (OSI) fue calculado como la relación TOS-a-TAS. El factor de necrosis tumoral alfa (TNF-alfa), proteína C reactiva (CRP), Na+/K+-ATPasa (bomba de sodio) y la Ca2+-ATPasa (calcio ATPasa) de la enzima se midieron los niveles en los tejidos mediante el método ELISA. Los niveles de proteína anti-apoptótica Bax y pro-apoptótica Bcl-2 se detectaron por el análisis de Western blot. Todos los datos fueron evaluados estadísticamente...


Assuntos
Animais , Masculino , Ratos , Berberina/administração & dosagem , Angiopatias Diabéticas/tratamento farmacológico , Rim/irrigação sanguínea , Traumatismo por Reperfusão/tratamento farmacológico , Diabetes Mellitus Experimental , Relação Dose-Resposta a Droga , Ratos Sprague-Dawley
4.
Ars pharm ; 60(1): 15-25, ene.-mar. 2019. tab, ilus, graf
Artigo em Espanhol | IBECS | ID: ibc-182796

RESUMO

Objective: Costus pictus D. Don is a traditionally used plant in Naojan area of Golaghat district of Assam, India specifically for treating diabetes. Six compounds were isolated from standardized methanolic extract of the aerial parts (MECP). The prime objective was to select most potent antidiabetic compounds among the isolated compounds viz. F67, F12, F16, F3032, F37 & F48 by using in vitro and in vivo methods. Methods: Isolated compounds were subjected to initial screening by in vitro alfa-amylase inhibition activity assay using iodine-starch and DNSA (3,5-dinitrosalicylic acid) methods. Compounds depicting promising in vitro activity were selected for in vivo Streptozotocin (STZ) induced antidiabetic screening activity. Then based on the in vivo results, most potent compounds were selected for instrumental characterization by Q-TOF ESI-MS, 1HNMR, 13CNMR & FTIR. Results: Amongst the six compounds isolated from MECP, three compounds viz. F12, F16 & F48 showed potent in vitro activity. They were subsequently subjected to evaluation of the antidiabetic activity in vivo by oral administration, at dose of 10, 20 & 50 mg/kg body weight respectively, using Wister rat (120-150 g) and Glibenclamide (10mg/k body weight) as standard. Two compounds, F12 and F48 at dose of 50 mg/kg body weight, reversed STZ induced diabetic parameters (increased blood glucose level, altered plasma profile and histoarchitecture of the pancreatic and hepatic cells) with statistical significance (P<0.05), that was comparable with the standard. Hence, instrumental characterization by Q-TOF ESI-MS, 1HNMR, 13CNMR & FTIR of compounds F12 and F48 isolated from MECP was carried out which established their identity as (3,5,7-Trihydroxy-3'-hydroxy-4'-methoxy) flavanone or [3,5,7-Trihydroxy-2-(3'-hydroxy-4'-methoxy phenyl)-2,3-dihydrochromen-4-one] and 3,5,8-trihydroxy-7-methoxy-2-phenyl-2,3-dihydrochromen-4-one or [7-methoxy-3, 5, 8 trihydroxy flavanone] respectively. Conclusion: The study culminated in elucidation of two flavanones as most potent compounds in exhibiting antidiabetic activities. The findings were thus successful in validating the traditional practices in Golaghat district of Assam, India, associated with the use of Costus pictus D. Don in the treatment of diabetes


Objetivo: Costus pictus D. Don es una planta usada tradicionalmente en la zona del distrito de Golaghat Naojan de Assam, India específicamente para el tratamiento de la diabetes. Seis compuestos se aislaron a partir de extracto metanólico estandarizados de las hojas (MECP). El principal objetivo fue seleccionar compuestos antidiabéticos más potentes entre los compuestos aislados viz. F67, F12, F16, F3032, F37 y F48 mediante métodos in vitro e in vivo. Métodos: Los compuestos aislados fueron sometidos a cribado inicial mediante ensayo de actividad de inhibición in vitro alfa-amilasa utilizando yodo-almidón y métodos DNSA (ácido 3,5-dinitrosalicilico). Los compuestos que presentaban una actividad in vitro prometedora se seleccionaron para la actividad de cribado antidiabético inducida por estreptozotocina (STZ) in vivo. En función de los resultados in vivo, la mayoría de los compuestos potentes se seleccionaron para la caracterización instrumental por Q-TOF ESI-MS, 1HNMR, 13CNMR y FTIR. Resultados: Entre los seis compuestos aislados de MECP, tres compuestos viz. F12, F16 y F48 mostraron una potente actividad. Posteriormente se sometieron a evaluación de la actividad antidiabética in vivo mediante administración oral, en dosis de 10, 20 y 50 mg / kg peso, utilizando ratas Wister (120-150 g) y glibenclamida (10 mg / kg peso) como estándar. Dos compuestos, F12 y F48 en dosis de 50 mg/kg peso, revirtieron los parámetros diabéticos inducidos por STZ (aumento del nivel de glucosa en sangre, plasma perfil alterado y histoarquitectura del páncreas y células hepáticas), con significación estadística (P<0,05) que era comparable con la norma. Se llevo a cabo la caracterización instrumental por Q-TOF ESI-MS, RMN 1H, RMN 13C y FTIR de los compuestos F12 y F48 aislado de MECP, lo que estableció su identidad como (3,5,7-trihidroxi-3'-hidroxi-4'- metoxi) flavanona o [3,5,7-trihidroxi-2- (fenil 3'-hidroxi-4'-metoxi) -2,3-dihydrochromen-4-ona] y 3,5,8-trihidroxi-7-metoxi -2-fenil-2,3-dihydrochromen-4-ona o [7-metoxi-3, 5, 8 trihidroxi flavanona] respectivamente. Conclusión: El estudio culminó en la elucidación de dos flavanonas como los compuestos más potentes en la exposición de actividades antidiabéticas. Los resultados lograron validar las prácticas tradicionales en el distrito de Golaghat de Assam, India, asociados con el uso de Costus pictus D. Don en el tratamiento de la diabetes


Assuntos
Humanos , Feminino , Ratos , Hipoglicemiantes/isolamento & purificação , Hipoglicemiantes/farmacologia , Extratos Vegetais/química , Diabetes Mellitus Experimental/tratamento farmacológico , Costus/química , Hipoglicemiantes/química , Ratos Wistar
5.
Clín. investig. arterioscler. (Ed. impr.) ; 30(6): 249-257, nov.-dic. 2018. graf
Artigo em Espanhol | IBECS | ID: ibc-175443

RESUMO

La pérdida del rol modulador del endotelio podría estar implicada en la patogénesis de las complicaciones vasculares diabéticas. Los compuestos de metales de transición tales como wolframio y vanadio se han propuesto como posibles agentes en el tratamiento de la diabetes al simular los efectos de la insulina. El lecho vascular mesentérico interviene en la resistencia vascular y constituye una fuente de compuestos vasoactivos como los prostanoides. El objetivo de este trabajo fue estudiar los efectos de los tratamientos con tungstato de sodio y sulfato de vanadilo sobre los parámetros metabólicos y la liberación de prostanoides del lecho vascular mesentérico en un modelo experimental de diabetes inducida por estreptozotocina. En ratas diabéticas se observó un aumento significativo de los niveles plasmáticos de glucosa, triglicéridos y colesterol total. Por su parte, se observó una reducción significativa en la liberación de los prostanoides vasodilatadores como la prostaciclina y la prostaglandina E2 y del vasoconstrictor tromboxano A2 por el lecho vascular mesentérico. Tanto el tungstato de sodio como el sulfato de vanadilo normalizaron la glucemia, la trigliceridemia y la colesterolemia en las ratas diabéticas. Por otra parte, solo el tratamiento con tungstato de sodio revirtió la reducción en la liberación de prostanoides vasodilatadores, mejorando en los animales diabéticos la relación prostaciclina/tromboxano, un indicador de disfunción vascular. En conclusión, a diferencia del sulfato de vanadilo, el tungstato de sodio demuestra ser más eficaz para controlar las alteraciones metabólicas y de la producción de prostanoides vasodilatadores observadas en la diabetes experimental inducida por estreptozotocina


The loss of the modulator role of the endothelium could be involved in the pathogenesis of diabetic vascular complications. Transition metal compounds, such as tungsten and vanadium, have been proposed as possible agents in the treatment of diabetes by simulating the effects of insulin. The mesenteric vascular bed intervenes in vascular resistance and is a source of vasoactive compounds, such as prostanoids. The aim of this work was to study the effects of sodium tungstate and vanadyl sulphate treatments on the metabolic parameters and the release of prostanoids of the mesenteric vascular bed in an experimental model of Streptozotocin-induced diabetes. In diabetic rats, a significant increase was observed in plasma levels of glucose, triglycerides and total cholesterol. On the other hand, there was a significant reduction in the release of vasodilator prostanoids, such as prostacyclin and prostaglandin E2 and vasoconstrictor thromboxane A2 through the mesenteric vascular bed. Both sodium tungstate and vanadyl sulphate normalised glycaemia, triglyceridaemia and cholesterolaemia in rats diabetics. On the other hand, only treatment with sodium tungstate reversed the reduction in the release of vasodilator prostanoids, improving in diabetic animals the prostacyclin/thromboxane ratio, an indicator of vascular dysfunction. In conclusion, unlike vanadyl sulphate, sodium tungstate is shown to be more effective in controlling metabolic changes and the production of vasodilator prostanoids observed in experimental diabetes induced by streptozotocin


Assuntos
Animais , Ratos , Compostos de Tungstênio/farmacologia , Compostos de Vanádio/farmacologia , Ácidos Prostanoicos/fisiologia , Artérias Mesentéricas , Artérias Mesentéricas/fisiologia , Diabetes Mellitus Experimental/fisiopatologia , Ratos
6.
J. physiol. biochem ; 74(3): 403-416, ago. 2018. graf
Artigo em Inglês | IBECS | ID: ibc-178995

RESUMO

Diabetes mellitus (DM) is a chronic disease that can affect metabolism of glucose and other metabolites. In this study, the normal- and obese-diabetic rats were compared to understand the diabetes disorders of type 1 and 2 diabetes mellitus. This was done by evaluating their urine metabolites using proton nuclear magnetic resonance (1H NMR)-based metabolomics and comparing with controls at different time points, considering the induction periods of obesity and diabetes. The biochemical parameters of the serum were also investigated. The obese-diabetic model was developed by feeding the rats a high-fat diet and inducing diabetic conditions with a low dose of streptozotocin (STZ) (25 mg/kg bw). However, the normal rats were induced by a high dose of STZ (55 mg/kg bw). A partial least squares discriminant analysis (PLS-DA) model showed the biomarkers of both DM types compared to control. The synthesis and degradation of ketone bodies, tricarboxylic (TCA) cycles, and amino acid pathways were the ones most involved in the variation with the highest impact. The diabetic groups also exhibited a noticeable increase in the plasma glucose level and lipid profile disorders compared to the control. There was also an increase in the plasma cholesterol and low-density lipoprotein (LDL) levels and a decline in the high-density lipoprotein (HDL) of diabetic rats. The normal-diabetic rats exhibited the highest effect of all parameters compared to the obese-diabetic rats in the advancement of the DM period. This finding can build a platform to understand the metabolic and biochemical complications of both types of DM and can generate ideas for finding targeted drugs


No disponible


Assuntos
Animais , Masculino , Ratos , Diabetes Mellitus Experimental/sangue , Hipoglicemiantes/farmacologia , Metaboloma , Metformina/farmacologia , Obesidade/sangue , Aminoácidos/sangue , Aminoácidos/urina , Glicemia/metabolismo , HDL-Colesterol/sangue , LDL-Colesterol/sangue , Diabetes Mellitus Tipo 1 , Diabetes Mellitus Tipo 2 , Dieta Hiperlipídica/efeitos adversos , Corpos Cetônicos/sangue , Ratos Sprague-Dawley
7.
J. physiol. biochem ; 74(3): 467-478, ago. 2018. tab, graf, ilus
Artigo em Inglês | IBECS | ID: ibc-179000

RESUMO

Despite the effectiveness of renin-angiotensin blockade in retarding diabetic nephropathy progression, a considerable number of patients still develop end-stage renal disease. The present investigation aims to evaluate the protective potential of FPS-ZM1, a selective inhibitor of receptor for advanced glycation end products (RAGE), alone and in combination with valsartan, an angiotensin receptor blocker, against glomerular injury parameters in streptozotocin-induced diabetic rats. FPS-ZM1 at 1 mg/kg (i.p.), valsartan at 100 mg/kg (p.o.), and their combination were administered for 4 weeks, starting 2 months after diabetes induction in rats. Tests for kidney function, glomerular filtration barrier, and podocyte slit diaphragm integrities were performed. Combined FPS-ZM1/valsartan attenuated diabetes-induced elevations in renal levels of RAGE and phosphorylated NF-κB p65 subunit. It ameliorated glomerular injury due to diabetes by increasing glomerular nephrin and synaptopodin expressions, mitigating renal integrin-linked kinase (ILK) levels, and lowering urinary albumin, collagen type IV, and podocin excretions. FPS-ZM1 also improved renal function as demonstrated by decreasing levels of serum cystatin C. Additionally, the combination also alleviated indices of renal inflammation as revealed by decreased renal monocyte chemoattractant protein 1 (MCP-1) and chemokine (C-X-C motif) ligand 12 (CXCL12) expressions, F4/80-positive macrophages, glomerular TUNEL-positive cells, and urinary alpha-1-acid glycoprotein (AGP) levels. These findings underline the benefits of FPS-ZM1 added to valsartan in alleviating renal glomerular injury evoked by diabetes in streptozotocin rats and suggest FPS-ZM1 as a new potential adjunct to the conventional renin-angiotensin blockade


No disponible


Assuntos
Humanos , Masculino , Ratos , Benzamidas/uso terapêutico , Diabetes Mellitus Experimental/complicações , Nefropatias Diabéticas/prevenção & controle , Barreira de Filtração Glomerular , Valsartana/uso terapêutico , Insuficiência Renal/prevenção & controle , Administração Oral , Bloqueadores do Receptor Tipo 1 de Angiotensina II/administração & dosagem , Bloqueadores do Receptor Tipo 1 de Angiotensina II/uso terapêutico , Biomarcadores , Nefropatias Diabéticas/metabolismo , Nefropatias Diabéticas/fisiopatologia , Barreira de Filtração Glomerular/metabolismo , Barreira de Filtração Glomerular/patologia , Valsartana/administração & dosagem
8.
J. physiol. biochem ; 74(2): 345-358, mayo 2018. ^f345^l358
Artigo em Inglês | IBECS | ID: ibc-178990

RESUMO

Chronic inflammation plays an essential role in the development of diabetic complications. Understanding the molecular mechanisms that support inflammation is a prerequisite for the design of novel anti-inflammatory therapies. These would take into consideration circulating levels of cytokines and damage-associated molecular patterns (DAMPs) that include the high mobility group box 1 (HMGB1) protein which, in part, promotes the inflammatory response through TLR4 signaling. The liver, as the source of circulating cytokines and acute-phase proteins, contributes to the control of systemic inflammation. We previously found that liver injury in streptozotocin-induced diabetic rats correlated with the level of oxidative stress, increased expression of HMGB1, and with the activation of TLR4-mediated cell death pathways. In the present work, we examined the effects of ethyl pyruvate (EP), an inhibitor of HMGB1 release/expression, on the modulation of activation of the HMGB1/TLR4 inflammatory cascade in diabetic liver. We observed that increased expression of inflammatory markers, TNF-α, IL-6, and haptoglobin in diabetic liver was associated with increased HMGB1/TLR4 interaction, activation of MAPK (p38, ERK, JNK)/NF-κB p65 and JAK1/STAT3 signaling pathways, and with decreased expression of Nrf2-regulated antioxidative enzymes. The reduction in HMGB1 expression as the result of EP administration reduced the pro-inflammatory activity of HMGB1 and exerted a protective effect on diabetic liver, which was observed as improved liver histology and antioxidant and inflammatory statuses. Our results suggest that prevention of HMGB1 release and blockage of the HMGB/TLR4 axis represents a potentially effective therapeutic strategy aimed at ameliorating diabetes-induced inflammation and ensuing liver injury


No disponible


Assuntos
Humanos , Animais , Diabetes Mellitus Experimental/complicações , Proteína HMGB1/metabolismo , Inflamação/metabolismo , Hepatopatias/complicações , Receptor 4 Toll-Like/metabolismo , Biomarcadores/metabolismo , Diabetes Mellitus Experimental/metabolismo , Diabetes Mellitus Experimental/patologia , Haptoglobinas/metabolismo , Interleucina-6/metabolismo , Hepatopatias/metabolismo , Hepatopatias/patologia , Fator 2 Relacionado a NF-E2/metabolismo , Ratos Wistar
9.
J. physiol. biochem ; 73(4): 511-521, nov. 2017. ilus, graf
Artigo em Inglês | IBECS | ID: ibc-178901

RESUMO

The progression of oxidative stress, resulting cell damage, and cell death underlies the etiology of liver damage/dysfunction as a complication of diabetes. High-mobility group box 1 (HMGB1) protein, a chromatin-binding nuclear protein and damage-associated molecular pattern molecule, is integral to oxidative stress and signaling pathways regulating cell death and cell survival. We previously found that in streptozotocin (STZ)-induced diabetic rats, reduction of oxidative stress after melatonin administration lowered necrotic cell death and increased expression of HMGB1 and hepatocellular damage. In the present study, we examined whether alleviation of diabetes-attendant oxidative stress and ensuing change in HMGB1 expression influence the dynamic equilibrium between apoptosis/autophagy and liver damage. We observed that elevated HMGB1 protein levels in diabetic rat liver accompanied increased interactions of HMGB1 with TLR4 and RAGE, and activation of the intrinsic apoptotic pathway and Beclin 1-dependent autophagy. The absence of p62 degradation in diabetic rat liver pointed to defective autophagy which was responsible for lower autophagosome/autophagolyso some formation and an increased apoptosis/autophagy ratio. Compared to diabetic rats, in melatonin-treated diabetic rats, the structure of liver cells was preserved, HMGB1/TLR4 interaction and downstream apoptotic signaling were significantly reduced, HMGB1/Beclin 1 colocalization and interactions were augmented and Beclin 1-mediated autophagy, mithophagy in particular, were increased. We concluded that in mild oxidative stress, HMGB1 is cytoprotective, whereas in intense oxidative stress, HMGB1 actions promote cell death and liver damage. Since reduced HMGB1 binds to RAGE but not to TLR4, redox modification of HMGB1 as a mechanism regulating the cross-talk between apoptosis and autophagy in diabetes is discussed


No disponible


Assuntos
Animais , Ratos , Apoptose/fisiologia , Autofagia/fisiologia , Diabetes Mellitus Experimental/patologia , Proteína HMGB1/fisiologia , Fígado/patologia , Estresse Oxidativo , Melatonina
10.
J. physiol. biochem ; 73(3): 387-394, ago. 2017. tab, ilus, graf
Artigo em Inglês | IBECS | ID: ibc-178890

RESUMO

The mechanisms by which exendin-4 and selenium exert their antidiabetic actions are still unclear. Here, we investigated the effects of exendin-4 or selenium administration on the expression of glucagon-like peptide-1 receptor (GLP-1R), insulin receptor substrate-1 (IRS-1), and preproinsulin in the pancreas of diabetic rats. Diabetes was induced by streptozotocin administration. Diabetic rats were injected intraperitoneally with 0.03 μg exendin-4/kg body weight/daily or treated with 5 ppm selenium in drinking water for a period of 4 weeks. GLP-1R and IRS-1 levels were decreased while the level of preproinsulin messenger RNA (mRNA) was increased in the pancreas of diabetic untreated rats, as compared to that in control rats. Treatment of diabetic rats with exendin-4 increased protein and mRNA levels of GLP-1R, and IRS-1, and the mRNA level of preproinsulin in the pancreas, as compared to their levels in diabetic untreated rats. Selenium treatment of diabetic rats increased the pancreatic mRNA levels of GLP-1R, IRS-1, and preproinsulin. Exendin-4 or selenium treatment of diabetic rats also increased the numbers of pancreatic islets and GLP-1R molecules in the pancreas. Therefore, exendin-4 and selenium may exert their antidiabetic effects by increasing GLP-1R, IRS-1, and preproinsulin expression in the pancreas and by increasing the number of pancreatic islets


No disponible


Assuntos
Animais , Masculino , Diabetes Mellitus Experimental/tratamento farmacológico , Insulina/metabolismo , Pâncreas/metabolismo , Peptídeos/farmacologia , Selênio/farmacologia , Venenos/farmacologia , Diabetes Mellitus Experimental/metabolismo , Peptídeo 1 Semelhante ao Glucagon/metabolismo , Proteínas Substratos do Receptor de Insulina/metabolismo , Pâncreas , Precursores de Proteínas/metabolismo , Ratos Sprague-Dawley
11.
J. physiol. biochem ; 72(4): 791-801, dic. 2016. tab, graf
Artigo em Inglês | IBECS | ID: ibc-168384

RESUMO

The present study investigated the effects of myo-inositol on muscle glucose uptake and intestinal glucose absorption ex vivo as well as in normal and type 2 diabetes model of rats. In ex vivo study, both intestinal glucose absorption and muscle glucose uptake were studied in isolated rat jejunum and psoas muscle respectively in the presence of increasing concentrations (2.5 % to 20 %) of myo-inositol. In the in vivo study, the effect of a single bolus dose (1 g/kg bw) of oral myo-inositol on intestinal glucose absorption, blood glucose, gastric emptying and digesta transit was investigated in normal and type 2 diabetic rats after 1 h of co-administration with 2 g/kg bw glucose, when phenol red was used as a recovery marker. Myo-inositol inhibited intestinal glucose absorption (IC50 = 28.23 ± 6.01 %) and increased muscle glucose uptake, with (GU50 = 2.68 ± 0.75 %) or without (GU50 = 8.61 ± 0.55 %) insulin. Additionally, oral myo-inositol not only inhibited duodenal glucose absorption and reduced blood glucose increase, but also delayed gastric emptying and accelerated digesta transit in both normal and diabetic animals. Results of this study suggest that dietary myo-inositol inhibits intestinal glucose absorption both in ex vivo and in normal or diabetic rats and also promotes muscle glucose uptake in ex vivo condition. Hence, myo-inositol may be further investigated as a possible anti-hyperglycaemic dietary supplement for diabetic foods and food products (AU)


No disponible


Assuntos
Animais , Masculino , Ratos , Glicemia/metabolismo , Diabetes Mellitus Experimental/dietoterapia , Hiperglicemia/dietoterapia , Hipoglicemiantes/farmacologia , Inositol/farmacologia , Absorção Intestinal , Músculos Psoas , Administração Oral , Transporte Biológico , Suplementos Nutricionais , Jejuno , Técnicas de Cultura de Tecidos , Insulina/metabolismo , Ratos Sprague-Dawley , Metabolismo dos Carboidratos
12.
Endocrinol. nutr. (Ed. impr.) ; 63(7): 345-353, ago.-sept. 2016. tab
Artigo em Inglês | IBECS | ID: ibc-155103

RESUMO

Most research in diabetes mellitus (DM) has been conducted in animals, and their replacement is currently a chimera. As compared to when they started to be used by modern science in the 17th century, a very high number of animal models of diabetes is now available, and they provide new insights into almost every aspect of diabetes. Approaches combining human, in vitro, and animal studies are probably the best strategy to improve our understanding of the underlying mechanisms of diabetes, and the choice of the best model to achieve such objective is crucial. Traditionally classified based on pathogenesis as spontaneous or induced models, each has its own advantages and disadvantages. The most common animal models of diabetes are described, and in addition to non-obese diabetic mice, biobreeding diabetes-prone (BB-DP) rats, streptozotocin-induced models, or high-fat diet-induced diabetic C57Bl/6J mice, new valuable models, such as dogs and cats with spontaneous diabetes, are described (AU)


La mayoría de la investigación desarrollada en diabetes ha sido realizada mediante el uso de modelos animales, siendo su reemplazo todavía una quimera. Comparado con los primeros usos de estos modelos por la ciencia moderna, a partir del siglo XVII, el número de modelos animales disponible en la actualidad es muy elevado, ofreciendo nuevas perspectivas dentro de casi todos los aspectos de la enfermedad. Los abordajes que combinen estudios en humanos, in vitro y modelos animales son probablemente la mejor estrategia para mejorar el entendimiento de los mecanismos de la enfermedad aún subyacentes y, en este sentido, la elección del modelo que más se ajuste a dichos objetivos es determinante. Clasificados tradicionalmente en función de su patogénesis, en espontáneos o inducidos, cada modelo ofrece sus propias ventajas y desventajas. Se describen aquí los modelos de diabetes más comunes y, aparte del ratón Non-obese-Diabetic, la rata BioBreeding Diabetes-Prone, u otros modelos inducidos por estreptozotocina o dieta con alto contenido graso, se describen otros valiosos modelos de diabetes, como son el perro y el gato con diabetes espontáneas tipo 1 y tipo 2 (AU)


Assuntos
Animais , Diabetes Mellitus/fisiopatologia , Complicações do Diabetes/fisiopatologia , Modelos Animais de Doenças , Diabetes Mellitus Experimental/fisiopatologia
13.
J. physiol. biochem ; 72(2): 315-326, jun. 2016. ilus, graf, tab
Artigo em Inglês | IBECS | ID: ibc-168275

RESUMO

The hypothesis of fetal origins of adult disease states that early life events program the occurrence of significant adult diseases, including diabetes and obesity. Maternal diabetes is associated with general stress environment for developing fetus, and gestational diabetes is an independent risk factor for type 2 diabetes and metabolic syndrome in offspring. Intra-uterine fetal programming of fetal tissues exposes the offspring to increased risk of impaired glucose tolerance, type 2 diabetes, and cardiovascular disease. Here, we examined the transmission of maternal diabetes-induced fetal programming in second generation and compared maternal and paternal routes of intergenerational effects. We organized 40 Wistar rats into three groups, male offspring of diabetic mothers, female offspring of diabetic mothers, and offspring of control mothers. These groups were mated with normal healthy rats to assess the effect of grand-maternal diabetes on pregnancy outcome in F2 rats, as well as glucose-sensing parameters, insulin resistance, and glucose tolerance prenatally and postnatally. We found that F2 offspring of diabetic mothers had impaired glucose sensing, increased oxidative stress, insulin resistance, and impaired glucose tolerance, and these effects were more prominent in the F2 offspring of F1 female rats (F2-DF1F). We deduce that fetal programming of maternal diabetes is mostly transmitted through maternal line across two generations (AU)


No disponible


Assuntos
Animais , Masculino , Feminino , Gravidez , Diabetes Mellitus Experimental/fisiopatologia , Diabetes Mellitus Tipo 2/etiologia , Desenvolvimento Fetal , Intolerância à Glucose/etiologia , Resistência à Insulina , Herança Materna , Complicações na Gravidez/fisiopatologia , Tecido Adiposo , Ratos Wistar , Pâncreas , Fígado , Estresse Oxidativo , Células Secretoras de Insulina , Regulação da Expressão Gênica no Desenvolvimento , Biogênese de Organelas , Músculo Esquelético , Dinâmica Mitocondrial
14.
J. physiol. biochem ; 72(2): 327-336, jun. 2016. tab, graf, ilus
Artigo em Inglês | IBECS | ID: ibc-168276

RESUMO

Protective and prophylactic effects of omega-3 fatty acids on oxidative stress and inflammation are well known. We assessed beneficial effects of flaxseed oil and fish oil on streptozotocin (65 mg/kg; i.p.)-nicotinamide (110 mg/kg; i.p.) induced diabetic rats by studying renal expression of antioxidant and inflammatory genes. Diabetic rats given 10 % flaxseed oil or 10 % fish oil diet for 35 days showed significant decrease in renal lipid peroxidation. Flaxseed oil diet resulted in up-regulation of renal superoxide dismutase-1 (SOD-1) (activity and expression) and glutathione peroxidase-1 (GPx-1) expression. Furthermore, both diets up-regulated catalase (CAT) (activity and expression) and down-regulated heme oxygenase-1 (HO-1) expression. Both diets were able to limit the renal advanced glycation end products (AGEs) formation and reduced receptor of AGE (RAGE) protein expression significantly. Expressions of interleukin-6 (IL-6) and NF-κB p65 subunit were down-regulated significantly by flaxseed oil or fish oil diet. The histological tubular injuries were also lowered by both diets. These results suggest that dietary ω-3 fatty acids may slow the progression of diabetic nephropathy (DN) associated with oxidative stress, glycation, and inflammation in the kidney (AU)


No disponible


Assuntos
Animais , Masculino , Diabetes Mellitus Experimental/dietoterapia , Rim/metabolismo , Estresse Oxidativo , Gorduras Insaturadas na Dieta/uso terapêutico , Óleos de Peixe/uso terapêutico , Produtos Finais de Glicação Avançada/antagonistas & inibidores , Óleo de Semente do Linho/uso terapêutico , Biomarcadores/metabolismo , Ratos Wistar , Ácidos Graxos Ômega-3/uso terapêutico , Regulação da Expressão Gênica , Interleucina-6 , Peroxidação de Lipídeos , NF-kappa B , Niacinamida , Distribuição Aleatória , Estreptozocina
15.
Arch. Soc. Esp. Oftalmol ; 91(4): 170-176, abr. 2016. ilus, tab
Artigo em Espanhol | IBECS | ID: ibc-150684

RESUMO

OBJETIVOS: Conocer las características de la barrera sanguínea del nervio óptico de animales con diabetes inducida por estreptozotocina. MÉTODO: Los nervios ópticos de animales diabéticos y controles se estudiaron mediante microscopia óptica y microscopia electrónica de transmisión. La permeabilidad de los vasos fue determinada mediante la detección de albúmina con inmunofluorescencia indirecta y la expresión de las moléculas del complejo mayor de histocompatibilidad clase II mediante inmunofluorescencia directa. Asimismo, se realizó un análisis morfométrico de la superficie del nervio, el número de vasos y el engrosamiento de la célula endotelial y lámina basal. RESULTADOS: Los microvasos de los nervios ópticos de los animales diabéticos por efecto de la estreptozotocina se caracterizaron por un incremento en el grosor de su pared, conservación de los pericitos, incremento de la transcitosis en la célula endotelial y la presencia de una población importante de macrófagos perivasculares. En general, las manifestaciones del efecto de la hiperglucemia en el nervio óptico fueron más semejantes a las descritas para la microcirculación cerebral que a las descritas para la retina


OBJECTIVE: To study the features of the endoneurial micro-vessels of the optic nerve in streptozotocin-induced diabetic animals. METHODS: Optic nerves from control and streptozotocin-induced diabetic animals were studied by light and transmission electron microscopy. Patency was determined by indirect immunofluorescence albumin detection. The expression of major histocompatibility complex class II molecules was performed by direct immunofluorescence. The endoneurial vessels were counted, and the endothelial cell, the basement membrane, and the surface of the transverse section of the nerve were measured. RESULTS: Vessels of diabetic rats showed vessel wall thickening, preservation of pericytes, an increase in endothelial cell transcytosis, and an increased number of perivascular macrophage cells. It may be concluded that the effects of hyperglycaemia on the inner vessels of the optic nerve are more similar to the cerebral diabetic vessels than to the retinal vessels in diabetic animals


Assuntos
Animais , Masculino , Feminino , Ratos , Nervo Óptico/anatomia & histologia , Nervo Óptico/patologia , Nervo Óptico/fisiopatologia , Diabetes Mellitus Experimental/induzido quimicamente , Diabetes Mellitus Experimental/complicações , Diabetes Mellitus Experimental/patologia , Vasos Sanguíneos/anatomia & histologia , Vasos Sanguíneos/patologia , Vasos Sanguíneos/fisiopatologia , Nervo Óptico/ultraestrutura , Diabetes Mellitus Experimental/prevenção & controle , Diabetes Mellitus Tipo 2/complicações , Hiperglicemia/induzido quimicamente , Hiperglicemia/complicações , Hiperglicemia/patologia
16.
J. physiol. biochem ; 71(4): 743-751, dic. 2015.
Artigo em Inglês | IBECS | ID: ibc-145726

RESUMO

In the present study, we investigated the efficiency of rosmarinic acid (RA) in preventing the alteration of oxidative parameters in the liver and kidney of diabetic rats induced by streptozotocin (STZ). The animals were divided into six groups (n = 8): control, ethanol, RA 10 mg/kg, diabetic, diabetic/ethanol, and diabetic/RA 10 mg/kg. After 3 weeks of treatment, we found that TBARS levels in liver and kidney were significantly increased in the diabetic/saline group and the administration of RA prevented this increase in the liver and kidney (P < 0.05). Diabetes caused a significant decrease in the activity of superoxide dismutase (SOD) and catalase (CAT) in the diabetes/saline group (P < 0.05). However, the treatment with 10 mg/kg RA (antioxidant) prevented this alteration in SOD and CAT activity in the diabetic RA group (P < 0.05). In addition, RA reverses the decrease in ascorbic acid and non-protein-thiol (NPSH) levels in diabetic rats. The treatment with RA also prevented the decrease in the Delta-aminolevulinic acid dehydratase (ALA-D) activity in the liver and kidney of diabetic rats. Furthermore, RA did not have any effect on glycemic levels. These results indicate that RA effectively reduced the oxidative stress induced by STZ, suggesting that RA is a potential candidate for the prevention and treatment of pathological conditions in diabetic models (AU)


No disponible


Assuntos
Animais , Ratos , Diabetes Mellitus/tratamento farmacológico , Estresse Oxidativo , Antioxidantes/farmacocinética , Extratos Vegetais/farmacocinética , Biomarcadores/análise , Substâncias Protetoras/farmacocinética , Diabetes Mellitus/fisiopatologia , Diabetes Mellitus Experimental/fisiopatologia
17.
Nutr. hosp ; 32(1): 256-264, jul. 2015. tab, ilus
Artigo em Inglês | IBECS | ID: ibc-141368

RESUMO

Introduction: beta-glucans (BG) derived from plant tissues are reported to show metabolic effects. In contrast, those fibers isolated from yeast seem to be more related to immune response modulation. Since diabetic individuals are more susceptible to exacerbation of inflammatory signs, the ingestion of fibers that could conjugate both metabolic and immune effects would be of great importance. Objective: we investigated the effect of BG - Saccharomyses cerevisae - ingestion on glycemic and lipoprotein profile of diabetic rats. Design: twenty-four adult Wistar rats were used, distributed into 4 groups in a design of entirely casualized delineation with a 2 x2 factorial model (with and without diabetes; with and without BG). Diabetes Mellitus was induced by an intraperitoneal injection of 80mg/kg of strepzotocin. Thus, animals with fasting glycemia of over 250mg/dl were considered diabetic. Forty-eight hours after induction, the rats received daily doses of 30 mg/kg of BG or saline solution by gavage during 28 days. Results and discussion: the Groups with DM presented a higher glycemic index and lower C peptide levels than the control groups, in addition to lower weight gain and higher ration consumption, water ingestion and urinary volume. Total cholesterol levels (CT), LDL-C + VLDL-C, plasma triacylglycerides (TAG) and alanine aminotransferase (ALT) were also higher in the diabetic animals (p<0.05). No histopathological hepatic alterations were observed in any of the groups. Furthermore, the diabetic animals present increase in villous:crypt ratio (V:C) in the duodenum, without interference of BG. No alterations in the carcass were observed between the groups. Conclusion: it was concluded that the use of BG significantly reduced the glycemic, TAG and ALT levels, showing its therapeutic potential (AU)


Introdución: los beta-glucanos (BG) derivados de tejidos vegetales se ha informado que muestran efectos metabólicos. Por el contrario, esas fibras aisladas de levadura parecen estar más relacionadas con la modulación de la respuesta inmune. Dado que los individuos con diabetes son más susceptibles a la exacerbación de los signos inflamatorios, la ingestión de fibras sí podría conjugar ambos efectos metabólicos e inmunológicos, lo cual sería de gran importancia. Objetivo: el objetivo de este estudio fue investigar los efectos de la ingestión de los BG —Saccharomyses cerevisiae— en el perfil glucémico y la lipoproteína de ratas diabéticas. Metodos: en el diseño de delineación, totalmente precario, fueron utilizadas 24 ratas Wistar macho adultas distribuidas en cuatro grupos, con un modelo factorial 2x2 (con y sin diabetes, con y sin BG). La diabetes mellitus fue inducida por la inyección intraperitoneal de un 80 mg/kg de estrepzotocina. Por lo tanto, los animales con glucemia en ayunas de más de 250 mg/dl fueron considerados diabéticos. Cuarenta y ocho horas después de la inducción, las ratas recibieron dosis diarias de 30 mg/kg de BG o solución salina mediante alimentación forzada durante 28 días. Resultados y discusión: los grupos con DM presentó el mayor índice glucémico y menores niveles de péptido C que los grupos de control, además de reducir el aumento de peso y un mayor consumo de la ración, la ingestión de agua y el volumen urinario. Los niveles de colesterol total (CT), LDL-C + VLDL-C, triacilglicéridos plasmáticos (TAG) y alanina aminotransferasa (ALT) también fueron más altos en los animales diabéticos (p<0,05), y había alteraciones en los niveles de HDL-C. La ingestión de BG redujo las concentraciones de glucosa en sangre (30%), TAG (32%) y ALT (41%) (p<0.05). No se observaron alteraciones hepáticas en ninguno de los grupos. Además, los animales diabéticos presentaron un aumento de la relación cripta:vellosidades (V:C) en el duodeno, sin interferencia de BG. No se observaron alteraciones en la carcasa entre los grupos. Conclusión: se concluyó que el uso de BG redujo significativamente la glucemia, los niveles de TAG Y ALT, mostrando su potencial terapéutico (AU)


Assuntos
Animais , Ratos , Saccharomyces cerevisiae/metabolismo , beta-Glucanas/farmacocinética , Diabetes Mellitus Experimental/fisiopatologia , Estreptozocina/farmacocinética , Modelos Animais de Doenças , Substâncias Protetoras/farmacocinética , Metabolismo , Síndrome Metabólica/tratamento farmacológico
18.
Nefrología (Madr.) ; 35(3): 264-272, mayo-jun. 2015. ilus
Artigo em Espanhol | IBECS | ID: ibc-140055

RESUMO

Antecedentes: El cambio a ciclosporinaA podría revertir la diabetes inducida por tacrolimus. Sin embargo, los mecanismos de esta reversibilidad se desconocen. Métodos: Usamos como modelo de diabetes inducida por tacrolimus las ratas Zucker obesas. Un grupo de 44 ratas Zucker obesas fue tratado con tacrolimus durante 11 días (0,3mg/kg/día) hasta que desarrollaron diabetes; posteriormente, a)22 fueron sacrificadas a día 12 como grupo referencia (tacrolimus-d12), y b)en otras 22 el tacrolimus fue reemplazado por ciclosporina (2,5mg/kg/día) durante 5 días (tacrolimus-ciclosporina). Veintidós ratas Zucker obesas recibieron vehículo durante 17 días (grupo control). A todos los animales se les realizó una sobrecarga intraperitoneal de glucosa al final del experimento. Resultados: Se analizó la proliferación de la célulaβ, la apoptosis y la expresión del gen Ins2. En el grupo tacrolimus-ciclosporina, los niveles de glucemia mejoraron significativamente en cada punto del test intraperitoneal de glucosa comparados con el grupo tacrolimus-d12. La diabetes se redujo del 100% en los tacrolimus-d12 hasta el 50% en tacrolimus-ciclosporina. La proliferación de las células β en tacrolimus-ciclosporina se incrementó en comparación con tacrolimus-d12, pero fue menor que en los tratados con vehículo. La expresión génica de Ins2en tacrolimus-ciclosporina fue comparable a los tratados con el vehículo. Conclusión: El cambio temprano de tacrolimus por ciclosporina en la diabetes inducida por tacrolimus incrementa la proliferación de la célulaβ y revierte la diabetes en un 50% de los casos (AU)


Background: Switching to cyclosporinA may result in a reversion of tacrolimus-induced diabetes mellitus. However, mechanisms underlying such a reversion are still unknown. Methods: Obese Zucker rats were used as a model for tacrolimus-induced diabetes mellitus. A cohort of 44 obese Zucker rats received tacrolimus for 11 days (0.3mg/kg/day) until diabetes development; then: (a)22 rats were euthanized at day 12 and were used as a reference group (tacrolimus-day 12), and (b)22 rats on tacrolimus were shifted to cyclosporin (2.5mg/kg/day) for 5 days (tacrolimus-cyclosporin). An additional cohort of 22 obese Zucker rats received the vehicle for 17 days and were used as a control group. All animals underwent an intraperitoneal glucose tolerance test at the end of the study. Results: β-cell proliferation, apoptosis and Ins2 gene expression were evaluated. Compared to rats in tacrolimus-day 12 group, those in tacrolimus-cyclosporin group showed a significant improvement in blood glucose levels in all assessment points in intraperitoneal glucose tolerance test. Diabetes decreased from 100% in tacrolimus-day 12 group to 50% in tacrolimus-cyclosporin group. Compared to tacrolimus-day 12 group, rats in tacrolimus-cyclosporin group showed an increased β-cell proliferation, but such an increase was lower than in rats receiving the vehicle. Ins2 gene expressions in rats receiving tacrolimus-cyclosporin and rats receiving the vehicle were comparable. Conclusion: An early switch from tacrolimus to cyclosporin in tacrolimus-induced diabetes mellitus resulted in an increased β-cell proliferation and reversion of diabetes in 50% of cases (AU)


Assuntos
Animais , Feminino , Masculino , Ratos , Homeostase/fisiologia , Antígeno Nuclear de Célula em Proliferação/análise , Diabetes Mellitus/induzido quimicamente , Diabetes Mellitus/veterinária , Diabetes Mellitus Experimental , Tacrolimo/efeitos adversos , Tacrolimo/uso terapêutico , Ciclosporina/administração & dosagem , Ciclosporina/síntese química , Proliferação de Células/fisiologia , Obesidade/induzido quimicamente , Obesidade/complicações , Obesidade/veterinária , Expressão Gênica , Expressão Gênica/fisiologia , Projetos de Pesquisa/estatística & dados numéricos
19.
Nutr. hosp ; 31(4): 1647-1653, abr. 2015. ilus, tab
Artigo em Inglês | IBECS | ID: ibc-135069

RESUMO

Introduction: Liver disease as a major cause of mortality in patients with diabetes mellitus. There is a interest to investigate the hypolipidemic properties of yam. The goal was assess the role of Brazilian yam (Dioscorea bulbifera) on serum and hepatic levels of triglycerides and cholesterol, in female diabetic rats. Methods: The rats were divided into three groups: Control (C), Diabetic (DM); Diabetic Yam (DMY), treated with diet containing 25g/100g of yam flour. After 5 weeks of experiment, glucose, insulin, gonadal fat and liver mass were evaluated. Serum and liver concentrations of triglycerides and cholesterol concentrations were quantified. Total liver thiols were determined. Results: After the 5 weeks, experimental groups shower (P < 0.05): Lower body mass; lower serum insulin; higher food intake and higher blood glucose concentration. DMY (vs. DM) group showed (P < 0.05): Lower blood glucose; higher gonadal fat mass; lower serum and hepatic triglycerides; higher hepatic cholesterol and thiols concentrations. DMY (vs. C) group showed: Similar serum and hepatic triglycerides and hepatic thiols. Conclusions: Brazilian yam (Dioscorea bulbifera) alleviated the consequences of the experimental diabetic disease, suggesting protection to hypertriglyceridemia and lipid peroxidation (AU)


Introducción: La enfermedad hepática como una de las principales causas de mortalidad en los pacientes con diabetes mellitus. Hay un interés para investigar las propiedades hipolipemiantes de ñame. El objetivo era evaluar el papel de ñame brasileña (Dioscorea bulbifera) en suero y los niveles hepáticos de triglicéridos y colesterol, en las ratas diabéticas . Métodos: Las ratas se dividieron en tres grupos: control (C), diabéticos (DM); Diabetic ñame (DMA), se trata con dieta que contenía 25 g / 100 g de harina de ñame. Después de 5 semanas de experimento, la glucosa, la insulina, la grasa gonadal y la masa del hígado fueron evaluados. Se cuantificaron las concentraciones de suero e hígado de los triglicéridos y las concentraciones de colesterol. Se determinaron los tioles totales de hígado. Resultados: Después de las 5 semanas, experimental ducha grupos (p < 0.05) : la masa corporal inferior; insulina sérica inferior; más alta la ingesta de alimentos y una mayor concentración de glucosa en sangre. DMY (vs. DM) grupo mostró (P < 0.05) : Baje la glucosa en sangre; masa grasa gonadal superior; inferior y triglicéridos séricos hepáticas; más altos de colesterol y tioles concentraciones hepáticas. DMY (vs. C) grupo mostró: suero similares y triglicéridos hepáticos y tioles hepáticas. Conclusiones: Ñame brasileño (Dioscorea bulbifera) alivian las consecuencias de la enfermedad diabética experimental, lo que sugiere protección para la hipertrigliceridemia y la peroxidación lipídica (AU)


Assuntos
Animais , Ratos , Diabetes Mellitus Experimental/tratamento farmacológico , Dioscorea , Extratos Vegetais/farmacocinética , Peroxidação de Lipídeos , Hipertrigliceridemia/tratamento farmacológico , Modelos Animais de Doenças , Camundongos Endogâmicos NOD , Substâncias Protetoras/farmacocinética
20.
J. physiol. biochem ; 71(1): 51-58, mar. 2015.
Artigo em Inglês | IBECS | ID: ibc-133902

RESUMO

The current study was designed to explore whether microRNA-146a and its adapter proteins (tumor necrosis factor (TNF) receptor-associated factor 6 (TRAF6) and interleukin-1 receptor-associated kinase 1 (IRAK1)) are involved in the pathogenesis of diabetes neuropathy. Twelve male Sprague Dawley rats were randomized into control and diabetic groups (n = 6). Diabetes was induced by a single-dose injection of nicotinamide (110 mg/kg; i.p.), 15 min before injection of streptozotocin (50 mg/kg; i.p.) in 12-h-fasted rats. Diabetic neuropathy was evaluated by hot plate and tail emersion tests, 2 months after the injection of streptozotocin. The gene expression level of microRNA-146a (miR-146a), IRAK1, TRAF6, and nuclear factor kappa B (NF-κB) was measured in the sciatic nerve of rats using the real time-PCR method. Moreover, the activity of NF-κB and the concentration of pro-inflammatory cytokines were determined by the ELISA method. In comparison with the control group, a threefold increase in the expression of miR-146a and NF-κB, and a twofold decrease in the expression of TRAF6 were observed in the sciatic nerve of diabetic rats. Furthermore, the NF-κB activity and the concentration of TNF-α, interleukin 6 (IL-6), and interleukin 1β (IL-1β) in the sciatic nerve of diabetic rats were higher than in those of control counterparts. These results suggest that a defect in the NF-кB–miR-146a negative feedback loop may be involved in the pathogenesis of diabetic neuropathy


Assuntos
Animais , Ratos , Neuropatias Diabéticas/fisiopatologia , MicroRNAs/análise , Nervo Isquiático/fisiopatologia , Fator 6 Associado a Receptor de TNF/análise , Quinases Associadas a Receptores de Interleucina-1/análise , Estudos de Casos e Controles , Diabetes Mellitus Experimental/fisiopatologia , NF-kappa B/análise
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