Alteration of Purinergic Neurotransmission in Isolated Atria of Streptozotocin-induced Diabetic Rats

2012 ◽  
Vol 59 (2) ◽  
pp. 158-164 ◽  
Author(s):  
Diego Castro Musial ◽  
Kleber de Magalhães Galvão ◽  
Regiane Miranda-Ferreira ◽  
Edilson Dantas da Silva Júnior ◽  
Afonso Caricati-Neto ◽  
...  
Keyword(s):  
Diabetic Rats ◽  
Purinergic Neurotransmission ◽  
Isolated Atria

Alterations in alpha1-adrenoceptor stimulation of isolated atria from experimental diabetic rats

1986 ◽  
Vol 64 (2) ◽  
pp. 145-151 ◽  
Author(s):  
Charles V. Jackson ◽  
Gail M. McGrath ◽  
John H. McNeill
Keyword(s):  
Experimental Diabetes ◽  
Receptor Activation ◽  
Diabetic Rats ◽  
Sprague Dawley ◽  
Beta Adrenoceptor ◽  
Chemically Induced ◽  
Isolated Atria ◽  
And Control ◽  
Right Atria ◽  
Stimulation Of

This purpose of this investigation was to determine the influence of experimental diabetes (3 months) on the responsiveness of rat isolated atria to alpha1-adrenoceptor stimulation by phenylephrine. Diabetes was chemically induced with streptozotocin (65 mg/kg i.v.) in 42- to 43-day-old, nonfasted male Sprague–Dawley derived rats. Chronotropic (right atria) and inotropic (left atria) indices were recorded in response to alpha1-adrenoceptor stimulation by phenylephrine. These experiments were performed in the presence of beta-adrenoceptor antagonism (timolol). Isolated right atria from diabetic rats demonstrated a greater increase in heart rate in response to phenylephrine than did corresponding control atria. Left atria were supersensitive (decrease in EC50 values) and hyperresponsive to alpha1-adrenoceptor stimulation by phenylephrine when compared with stimulation of control left atria. Diabetic left atria in response to phenylephrine were observed to exchange more radioactive calcium (45Ca2+) than control left atria, whereas both diabetic and control left atria exchanged the same amount of 45Ca2+ during basal contractile conditions. Phenylephrine had no effect on 45Ca2+ efflux from either diabetic or control atria. These results indicate that 3 months of uncontrolled experimental diabetes in the rat produces an enhancement of alpha1-adrenoceptor activation of isolated atria, and that there is an alteration in Ca2+ mobilization which may contribute to the enhanced receptor activation.

Sites of Insulin Action Using Ferritin Labeling

1971 ◽  
Vol 29 ◽  
pp. 540-541
Author(s):  
Burton B. Silver ◽  
Ronald S. Nelson
Keyword(s):  
Electron Microscopy ◽  
Binding Sites ◽  
Anterior Pituitary ◽  
Insulin Action ◽  
Diabetic Rats ◽  
Insulin Antibody ◽  
Fat Pad ◽  
Target Organs ◽  
Uranium Salts ◽  
Sugar Levels

Some investigators feel that insulin does not enter cells but exerts its influence in some manner on the cell surface. Ferritin labeling of insulin and insulin antibody was used to determine if binding sites of insulin to specific target organs could be seen with electron microscopy.Alloxanized rats were considered diabetic if blood sugar levels were in excess of 300 mg %. Test reagents included ferritin, ferritin labeled insulin, and ferritin labeled insulin antibody. Target organs examined were were diaphragm, kidney, gastrocnemius, fat pad, liver and anterior pituitary. Reagents were administered through the left common carotid. Survival time was at least one hour in test animals. Tissue incubation studies were also done in normal as well as diabetic rats. Specimens were fixed in gluteraldehyde and osmium followed by staining with lead and uranium salts. Some tissues were not stained.

A PPARψ agonist improved diabetic state via decreasing TNF-α without any change including obesity in genetically obese diabetic rats

2001 ◽  
Vol 120 (5) ◽  
pp. A674-A674 ◽  
Author(s):  
A FUNAKOSHI ◽  
M ICHIKAWA ◽  
Y SATO ◽  
S KANAI ◽  
M OHTA ◽  
...  
Keyword(s):  
Diabetic Rats ◽  
Diabetic State ◽  
Tnf Α ◽  
Obese Diabetic Rats

791: Endothelial Rehabilitation - The Impact of Chronic PDE5 Inhibitors on Erectile Function and Protein Alterations in Cavernous Tissue of Diabetic Rats

2007 ◽  
Vol 177 (4S) ◽  
pp. 264-265
Author(s):  
Ling De Young ◽  
KokBin Lim ◽  
Jeffery Carson ◽  
Trustin Domes ◽  
Mussa Al-Numi ◽  
...  
Keyword(s):  
Erectile Function ◽  
Diabetic Rats ◽  
Pde5 Inhibitors ◽  
Cavernous Tissue ◽  
Protein Alterations ◽  
The Impact

Effects of Maternal Flaxseed Supplementation on Female Offspring of Diabetic Rats in Serum Concentration of Glucose, Insulin, and Thyroid Hormones

2019 ◽  
Vol 89 (1-2) ◽  
pp. 45-54
Author(s):  
Akemi Suzuki ◽  
André Manoel Correia-Santos ◽  
Gabriela Câmara Vicente ◽  
Luiz Guillermo Coca Velarde ◽  
Gilson Teles Boaventura
Keyword(s):  
Thyroid Hormones ◽  
High Fat Diet ◽  
Female Offspring ◽  
Flaxseed Oil ◽  
Diabetic Rats ◽  
High Fat ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Flaxseed Flour ◽  
Maternal Consumption

Abstract. Objective: This study aimed to evaluate the effect of maternal consumption of flaxseed flour and oil on serum concentrations of glucose, insulin, and thyroid hormones of the adult female offspring of diabetic rats. Methods: Wistar rats were induced to diabetes by a high-fat diet (60%) and streptozotocin (35 mg/kg). Rats were mated and once pregnancy was confirmed, were divided into the following groups: Control Group (CG): casein-based diet; High-fat Group (HG): high-fat diet (49%); High-fat Flaxseed Group (HFG): high-fat diet supplemented with 25% flaxseed flour; High-fat Flaxseed Oil group (HOG): high-fat diet, where soya oil was replaced with flaxseed oil. After weaning, female pups (n = 6) from each group were separated, received a commercial rat diet and were sacrificed after 180 days. Serum insulin concentrations were determined by ELISA, the levels of triiodothyronine (T3), thyroxine (T4) and thyroid-stimulating hormone (TSH) were determined by chemiluminescence. Results: There was a significant reduction in body weight at weaning in HG (−31%), HFG (−33%) and HOG (44%) compared to CG (p = 0.002), which became similar by the end of 180 days. Blood glucose levels were reduced in HFG (−10%, p = 0.044) when compared to CG, and there was no significant difference between groups in relation to insulin, T3, T4, and TSH after 180 days. Conclusions: Maternal severe hyperglycemia during pregnancy and lactation resulted in a microsomal offspring. Maternal consumption of flaxseed reduces blood glucose levels in adult offspring without significant effects on insulin levels and thyroid hormones.

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