Alloxan-induced Diabetes Research Articles

Antidiabetic and Antioxidative Potentials of Aqueous Extract of Cola Acuminata Leaves in Alloxan-Induced Diabetes Mellitus in Male Albino Rats

Antidiabetic and Antioxidative Potentials of Aqueous Extract of Cola Acuminata Leaves in Alloxan-Induced Diabetes Mellitus in Male Albino Rats

P-Synephrine ameliorates alloxan-induced diabetes mellitus through inhibiting oxidative stress and inflammation via suppressing the NF-kappa B and MAPK pathways.

Oxidative stress and inflammation play important roles in the development of diabetes mellitus. p-Synephrine, the primary pharmacologically active protoalkaloid in Citrus species, has been popularly consumed as a dietary supplement for weight loss management. However, the effects of p-synephrine on diabetes mellitus and the action mechanisms have not been clearly elucidated. In this study, the in vitro antioxidant effects of p-synephrine were evaluated. The data showed that p-synephrine treatment exhibited significant scavenging effects against DPPH, ABTS and OH radicals and showed high reducing power. Diabetic mice were developed by alloxan injection, followed by p-synephrine administration to investigate its hypoglycemic effects in vivo. The results showed that p-synephrine intervention significantly prevented alloxan-induced alteration in body weight, organ indexes, serum uric acid content and serum creatinine content. Meanwhile, p-synephrine application significantly improved the lipid profiles, superoxide dismutase (SOD) and catalase (CAT) activities and glutathione (GSH) contents in the serum and kidneys of diabetic mice and reduced the malondialdehyde (MDA) content in the serum of diabetic mice. Further assays suggested that p-synephrine treatment improved alloxan-induced decreases of glucose tolerance and insulin sensitivity. Also, p-synephrine supplementation altered histopathological changes in the kidneys and interscapular brown adipose tissues in diabetic mice. In addition, p-synephrine administration inhibited renal inflammation through suppressing tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6) and interleukin-1β (IL-1β) gene expression levels, as well as CD45 expression levels. The anti-inflammatory effects were probably involved in the regulation of nuclear factor-κB (NF-κB) activation and mitogen-activated protein kinase (MAPK) phosphorylation. In conclusion, p-synephrine application significantly ameliorated alloxan-induced diabetes mellitus by inhibiting oxidative stress via suppressing the NF-κB and MAPK pathways.

Evaluation of the antioxidant efficacy of Terpenes isolated from the Zingiber officinale Roscoe in treating experimentally alloxan-induced diabetes in Male Albino Rats

Evaluation of the antioxidant efficacy of Terpenes isolated from the Zingiber officinale Roscoe in treating experimentally alloxan-induced diabetes in Male Albino Rats

Beneficial Effects of Hibiscus sabdariffa in Diabetic Wistar Rats

Hibiscus sabdariffa is a yearly shrub that is widely grown in some Asian and African countries including Nigeria where it is commonly prepared as a hot or cold beverage and also used as medicine. It is applied in folklore remedies in the treatment of some ailments. This study was aimed at investigating the effects of the aqueous calyx extract of Hibiscus sabdariffa on some biochemical parameters of diabetic male Wistar rats. The rats were divided into four (4) groups of five (5) rats each. Group one (1) which served as non diabetic (negative) control received distilled water only. Group 2 served as diabetic control and received distilled water after alloxan-induced diabetes. Group three (3) and group four (4) were diabetic rats that received 250mg/kg bw and 500mg/kg bw of the aqueous calyx extract of Hibiscus sabdariffa respectively, for a period of four (4) weeks. The Statistical Program for Social Sciences (SPSS version 21.0) was used for the analysis. Differences between group means was tested using analysis of variance (ANOVA) and compared using the post hoc test. P<0.05 was considered statistically significant. The results obtained showed that the higher dose of the extract caused a significant decrease in blood glucose level in 4 weeks of the study. The changes observed in the plasma concentrations of electrolytes indicated that the extract significantly improved diabetes induced decrease in Cl- level while changes in Na+, K+ and HCO3- were not statistically significant. It also significantly improved lipid profile and reduced oxidative stress in diabetic male Wistar rats. This study revealed that, the calyx extract of Hibiscus sabdariffa demonstrated anti-hyperglycemic effects in diabetic Wistar rats.

Acute Toxicity Studies and Anti-diabetic Activity of Methanolic Root Extract of Kigelia africana (lam.) Benth in Alloxan Induced Diabetic Rats.

Diabetes mellitus (DM) is a metabolic disease which results in elevated blood sugar levels. Kigelia africana plant has many medicinal properties due to the presence of numerous secondary metabolites. The aim of this research was to evaluate the acute toxicity profile and anti-hyperglycemic potential of methanol root extract of Kigelia africana on alloxan-induced diabetic rats. Twenty (20) 3-4 weeks old albino rats of mixed sexes with body weight 60-100 g were grouped into five groups (GI - GV) of equal number of rats. Diabetes was induced in the rats of Groups GII -GV, while GI rats were considered as non-diabetic control. GII which is the Diabetic control were received no treatment whereas, GIII were administered orally with 5 mg/kg b.w of standard anti-diabetic drugs Glibenclamide, GIV were orally administered 250 mg/kg b.w of extract and GV were orally administered 500 mg/kg b.w of extract. After 14 days of the treatments, the animals were sacrificed and their serum was analysed for lipid profile, hematological parameters, liver and kidney indices. At the end of the study, the root extract was found to posses’ anti-diabetic potential and due to less toxicity at low dose of about 500 mg/kg, the extract is believed to be safe for consumption at low dosage.

PENGARUH EKSTRAK DAUN EKOR NAGA (Rhaphidophora pinnata (L.f) Schott) TERHADAP KADAR MALONDIALDEHID DARAH PADA TIKUS DIABETES YANG INDUKSI ALOKSAN

Ekor Naga (Rhaphidophora pinnata (L.f) Schott) leaves is a traditional medicinal plant that contains secondary metabolites of alkaloids, flavonoids, saponins, and tannins, which have antioxidant effects. Uncontrolled diabetes mellitus will be one of the triggers for high free radicals in the body. This study aims to determine the effect of the effect of ekor naga leaves extract which has potentian as an antioxidant on malondialdehyde levels as a prooxidant marker in alloxan-induced diabetes mellitus rats. The reseaech method used a post test only control group design. The test animals used were 20 animals, each group of 5 test animals. Group 1: Positive Control (Glibenclamide 10 mg/Kg BW), Group 2: Negative Control (Na CMC 0,5%), Group 3: Ekor Naga Leaf Extract 250 mg/Kg BW, and Group 4: Ekor Naga Leaves Extract 500 mg/Kg BW. The data taken is the level of malondialdehyde in the blood. The results were analyzed using One-way ANOVA with a 95% confidence level. The results showed that the ethanolic extract of the ekor naga leaves had a role in reducing Malondialdehyde or lipid peroxide in the blood in diabetic rats where the best dose is 500 mg/Kg with malondialdehyde yield of 0,569 nmol/mL. Followed by a dose of 250 mg/Kg BW with malondialdehyde value of 2,144 nmol/mL.

Anti oxidative activities of aqueous and ethanolic extracts of stem barks from trichilia emetica in albinos rats

: In chronic diseases in general and in diabetes mellitus and hypertension in particular, there is an important imbalance between antioxidant defenses and the production of free radicals due to reactive oxygen species, thus leading to an increase in oxidant stress markers. Therefore, this study was designed to evaluate the antioxydative and protective effects of aqueous and ethanolic extracts of trichilia emetica stem bark in albinos rats with alloxan-induced diabetes or adrenaline-induced hypertensive.: Two different batches of albinos rats were used distinctly and including a control one of 3 rats for each batch so a test group of 21 rats. Diabetes was induced by injecting Alloxane® intraperitoneally for 7 days. Hypertension was induced by injecting Adrenaline® intraperitoneally for eight days and we used visitech BP 2000 tools to measure arterial pressure. The aqueous and ethanolic extracts of Trichilia emetica were prepared and the obtained mixture was homogenized using a magnetic stirrer for 24 hours. Rats received the above-mentioned extracts orally at doses of 100 and 200 mg/kg bw for 6 days.: Aorta and heart activities of catalase were significantly increased. This same trend was observed with superoxide dismutase activity together with increasing AChE catalytic activity in vessels. Treatment of rats for seven days with extracts of Trichilia emetic and nifedipineproduced a significant decrease of antioxidative markers activities of catalase and SOD for aqueous and ethanolic extracts as well. This action was slightly above nifedipineone administrated at 10 and 20 mg/kg bw. For rats treated with Trichilia emetica or with diastabolwe registered a significant decrease of MDA and GSH concentration.Our results showed that the extracts have the potential to reduce the rate of reactive oxygen species and free radicals in rats with alloxane-induced diabetes or adrenaline-induced hypertensive. However, further large studies are needed to investigate the specific action and particularity of Trichilia emetica that could justify these activities.

Succinate dehydrogenase as a new target for melatonin binding in the complex diabetes mellitus treatment

Relevance. Alloxan, destroying the beta cells of the pancreas, provokes hyperglycemia, which causes a hypoenergetic state. Mitochondrial succinate dehydrogenase dysfunction plays an important role in the pathogenesis of diabetes. Pharmacotherapy of diabetes mellitus has been and remains the subject of numerous studies. Recently, the attention of researchers is increasingly attracted by the hormone of the pineal gland - melatonin, due to its biological and pharmacological properties. The aim of the study was to study the effect of melatonin on the activity of succinate dehydrogenase as a new target in experimental alloxan-induced diabetes mellitus. Materials and methods. The studies were carried out on male Wistar rats, with an average mass of 120-150 g, which were kept on a standard diet. The animals were divided into 4 groups. The control group was injected with saline solution, the second group was injected with melatonin at a dose of 1 mg/kg daily for 14 days, experimental diabetes in animals was simulated by intraperitoneal administration of alloxan at a dose of 150 mg/kg with diabetes. The fourth group of animals received melatonin on the background of alloxan. Succinate dehydrogenase activity was determined in liver and pancreatic tissues by photometric method. For the docking analysis, the AutoDock Vina and AutoDock Tools software packages were used. Results and Discussion. According to the results obtained, reciprocal relationships arise under the influence of alloxan in the activity of SDH in the liver and pancreas. Alloxan causes an increase in the activity of SDH in the liver by 1.9 times, and in the pancreatic tissue there is a significant decrease - by 5 times. The use of melatonin for animals with alloxan diabetes led to a decrease in the activity of succinate dehydrogenase in the liver by one and a half times in comparison with the indicators of rats with alloxan diabetes. In the pancreas, on the contrary, the activity of the enzyme increased by 3.3 times, which may indicate the restoration of the function of Langerhans beta cells. Conclusion. Melatonin blocking succinate dehydrogenase domain A reduces the hyperactivity of the enzyme in the liver, and in the pancreas through its specific receptors (MR1 and MR2) present on the surface of the membranes of β- and α-cells directly interferes with the function of the cellular elements of the islets of Langerhans, restoring them.

Dental Composites with Magnesium Doped Zinc Oxide Nanoparticles Prevent Secondary Caries in the Alloxan-Induced Diabetic Model.

Antibacterial restorative materials against caries-causing bacteria are highly preferred among high-risk patients, such as the elderly, and patients with metabolic diseases such as diabetes. This study aimed to enhance the antibacterial potential of resin composite with Magnesium-doped Zinc oxide (Mg-doped ZnO) nanoparticles (NPs) and to look for their effectiveness in the alloxan-induced diabetic model. Hexagonal Mg-doped ZnO NPs (22.3 nm diameter) were synthesized by co-precipitation method and characterized through ultraviolet-visible (UV-Vis), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) analysis. The Mg-doped ZnO NPs (1, 2.5 and 5% w/w) were then evaluated for antibacterial activity using a closed system in vitro biofilm model. Significant enhancement in the antibacterial properties was observed in composites with 1% Mg-doped ZnO compared to composites with bare ZnO reinforced NPs (Streptococcus mutans, p = 0.0005; Enterococcus faecalis, p = 0.0074, Saliva microcosm, p < 0.0001; Diabetic Saliva microcosm, p < 0.0001). At 1-2.5% Mg-doped ZnO NPs concentration, compressive strength and biocompatibility of composites were not affected. The pH buffering effect was also achieved at these concentrations, hence not allowing optimal conditions for the anaerobic bacteria to grow. Furthermore, composites with Mg-doped ZnO prevented secondary caries formation in the secondary caries model of alloxan-induced diabetes. Therefore, Mg-doped ZnO NPs are highly recommended as an antibacterial agent for resin composites to avoid biofilm and subsequent secondary caries formation in high-risk patients.

Evaluation of Healing and Microbial Responses to Surgical Wounds in Alloxan-induced Diabetic Rabbits

The wounds of diabetic patients are associated with delayed healing and microbial invasion. This study evaluated the healing and microbial responses to surgical wounds in diabetic rabbits. Sixteen (16) New Zealand White rabbits were used in this study. They were divided into 4 groups of 4 rabbits each, namely; A, B, C and D. A is the control (non-diabetic and non-wounded), B (diabetic and non-wounded), C (wounded and non-diabetic) and D (wounded and diabetic). Three (3) cm2 skin wounds were created in a standard aseptic condition while diabetes was induced by intravenous administration of 200 mg/kg of alloxan monohydrate. Blood samples were collected from ear vein of each rabbit on days 0, 3, 7, 14, 21 and 28 post-surgery for analysis of blood glucose level. Wound samples were collected on days 3, 7, 14 and 21 to evaluate microbial contaminants. The wounds were examined for exudation and recorded as none (0), scant (1), moderate (2) and large (3) and diameter of wound epithelialization and contraction were determined. The blood glucose concentration of groups B and D from days 3 to 28 ranged between 288.00 ± 40.22 mg/dl to 358.65 ± 25.89 mg/dl), and were significantly higher (P < 0.05) than the corresponding values of groups A and C which ranged from 120.60 mg/dl ± 14.29 to 129.60 ± 8.18 mg/dl. The rate of wound contraction in the C group on day 7 (11.02 ± 2.17%) was significantly higher (P < 0.05) than the D group (2.23 ± 4.60%). Staphylococcus and Pseudomonas subspecies were identified in the wounds of rabbits in groups C and D. It was concluded that alloxan-induced diabetes caused delayed wound healing. At the same time Staphyloccocus and Pseudomonas species were the predominant microorganism detected in the acute wounds of diabetic and non-diabetic rabbits.

Biochemical Composition and Effects of Aqueous Extracts of the Leaf, Stem and Root of Securidaca longipedunculata Fresen (Violet Tree) on Alloxan Induced Diabetic Rats

Biochemical Composition and Effects of Aqueous Extracts of the Leaf, Stem and Root of Securidaca longipedunculata Fresen (Violet Tree) on Alloxan Induced Diabetic Rats

Antidiabetic Effects of Aqueous Extracts of Bannufera Mangii Roots and Mannufera Jangii Leaves on Alloxan Induced Diabetic Rats

Diabetes is one of the leading causes of death world over, with no known scientifically proved cure so far. The present study evaluated the serum glucose lowering potentials of aqueous extracts of Bannufera mangii roots and Mannufera jangii leaves on alloxan induced diabetic rats. The most potent extract was further studied for its effects on serum insulin. Administration of 80 mg/kg of alloxan monohydrate have significantly increased blood glucose level and affect the serum insulin and lipid profile as well as oxidative stress makers. Treatments of diabetic rats with 300mg/kg body weight of the two extracts and conventional antidiabetic drug showed significant reduction in blood glucose levels by 35.2%, 59.2% and 67.0% for B. mangii, M. jangii and metformin respectively. The remarkable antihyperglycaemic, antihyperlipidemic, antioxidants and non-toxic (at 3000 mg/kg) potentials exhibited by M. jangii, validates its traditional use as an antidiabetic plant. Therefore, the plant has demonstrated a potential as another source of alternative therapeutic agent for the treatment of diabetes mellitus.

Antidiabetic Effects of Aqueous Extracts of Bannufera Mangii Roots and Mannufera Jangii Leaves on Alloxan Induced Diabetic Rats

Antidiabetic Effects of Aqueous Extracts of Bannufera Mangii Roots and Mannufera Jangii Leaves on Alloxan Induced Diabetic Rats

Effect of Methanolic Leaf Extract of Carissa Edulis on Alloxan Induced Diabetic Albino Rats

Effect of Methanolic Leaf Extract of Carissa Edulis on Alloxan Induced Diabetic Albino Rats

Increased CD34 in pancreatic islet negatively predict islet β-cell decrease in type1 diabetes model.

Islet β-cell biomarkers can reflect changes in the number and function of islet β-cells in the prediabetes or early diabetes stage. CD34 is a commonly used stem cell biomarker; however, its expression and function in pancreatic islets remain unclear. In the present study, double immunofluorescence staining, proteomic bioinformatics analysis, and correlation analysis were used to explore the potential of CD34 as an islet β-cell biomarker. Bioinformatics analysis revealed that the amino acid sequence of CD34 was conserved among multiple species and abundantly expressed on mouse and human pancreatic tissues. Immunofluorescence demonstrated that in the control rat pancreas, CD34 was expressed on glucagon-labeled islet α-cells but not on insulin-labeled islet β-cells. Furthermore, the proportion of CD34-positive cells, which were also positive for glucagon, was significantly increased in alloxan-induced diabetes models. Statistical analysis revealed that the expression of CD34 was negatively correlated with the number of insulin-labeled islet β-cells during diabetes progression in dose-dependent fashion in alloxan-induced diabetes models. Furthermore, the results suggested that the transdifferentiation of islet β-cells into islet α-cells may occur in the process of diabetes. Thus, the present study demonstrated that CD34 is expressed on islet α-cells, and its number is linearly and negatively correlated with the number of islet β-cells, suggesting that CD34 can be used as a prospective biomarker for islet β-cells in the early diagnosis of diabetes. The study also suggests the transformation of β-cells to α-cells in diabetes which provide a potential to be applied towards diabetes mechanism research.

Anti-Diabetic and Cytotoxic Evaluation of Phlomis stewartii Plant Phytochemicals on Cigarette Smoke Inhalation and Alloxan-Induced Diabetes in Wistar Rats.

The generation of free radicals in body causes oxidative stress and consequently different metabolic disorders. There are numerous environmental and emotional factors that trigger free radical generation, cigarette smoke (CS) is one of them. In addition to free radical production, it also increases the risk of developing type II diabetes, cancer, and has adverse effects on other organs such as liver and kidneys. In the present study, extracts of leaves, flower, and whole plant of P. stewartii Hf. in methanol were analyzed using LC-ESI-MS and investigated for their cytotoxic properties against HepG2 cell line and CS alloxan-induced diabetes in Wistar albino rats model. A total of 24 rats were kept in aerated cage for eight weeks and exposed to CS following the administration of single dose of alloxan@140 mg/kg body weight at the end of six weeks to induce diabetes mellitus (DM). The cytotoxic activity of extracts against HepG2 was recorded in the order; leaves methanol (LM) > flower methanol (FM) and whole plant methanol (WPM). The IC50(1/4) values were in the order of 187 (LM) > 280 (FM) > 312 (WPM) µg/mL against HepG2. In positive control group, CS- and alloxan-induced diabetes significantly increased (p < 0.05) the level of alanine alkaline phosphatase (ALP), aminotransferase (ALT), aspartate aminotransferase (AST), low density lipoprotein (LDL), bilirubin, total protein, creatinine, uric acid, blood urea, globulin, total oxidant status (TOS), and malondialdehyde (MDA), as compared to negative control group. In conclusion, according to the results of this study, P. Stewartii methanol extracts showed good antioxidant, anticancer activity and worked well to recover the tested clinical parameters in CS/alloxan-induced diabetes animals, which indicated the extracts also possess good antidiabetic, hepatoprotective, and nephroprotective potential.

The Impact of Pumpkin Seed Extracts on the Histology of the Hypothalamus and Testosterone Level of Alloxan Induced Diabetic Male Rats

Objective: Epidemiologic studies and randomized clinical trials demonstrate that type 2 diabetes can be substantially avoided by making dietary and lifestyle changes rather than relying heavily on medications. This study evaluates the ameliorating effect(s) of Telfairia occidentalis seed administration on the histology of the Hypothalamus and testosterone level in normal and Alloxan-induced diabetes in Wistar rats.&#x0D; Methods: Twenty male Wistar rats, weighing between 120-180 g, were divided into five groups of 4 rats each. Groups 1 and 2 representing Normal Control (NC) and Diabetic Control (DC) received only feed and water. Group 3 normal rats received 300 mg/kg Telfairia occidentalis seed extract; groups 4 and 5 received 50 mg/kg of Metformin and 300 mg/kg of Telfairia occidentalis seed extract respectively.&#x0D; Results: The result revealed that the administration of Telfairia occidentalis seed extract moderately increased the body weight (16.76±1.75%) significantly at (P&lt;0.05) when compared to normal control (14.06±2.93%) and diabetes significant decrease (-27.68±1.92%) body weight when compared to metformin-treated (-6.11±1.85%) and extract (-5.33±2.18%). The levels of FBG with the extract (60.70±4.88%) and metformin (61.24±6.19%) significantly decreased at (p&lt;0.05) when compared to diabetic control (-64.78±12.51%).The FSH and LH level significantly increased at (p&lt;0.05). Histological changes were also seen in animals of the treated groups.&#x0D; Conclusion: It is evident that Telfairia occidentalis seed extract contains anti-hyperglycemic agents capable of lowering blood glucose levels.

Experimental Correction of Homeostasis Changes during Alloxan-Induced Diabetes by Implantation of Islet Cells Cultured in Fibrous TiNi-Based Scaffold.

The use of fibrous scaffolds made of titanium nickelide and carrying islet cells (IC) after a course of alloxan administration was studied in vivo. Scanning electron microscopy showed good adhesion of IC in the pore space of the scaffolds. In 28 days, mature tissue comprising both cellular and fibrous components filled the inner space of the scaffold by 90%. The advantage of intraperitoneal implantation of IC in vitro seeded in fibrous titanium nickelide scaffolds in comparison with injection of IC (6×105 cells) to Wistar rats was demonstrated in the dynamics of pancreatic function recovery (normalization of blood glucose and glycosylated hemoglobin concentrations by day 21 of the experiment), regeneration of the white hematopoietic lineage cells, and lengthening (by 2 times) of the lifespan of animals with alloxan-induced diabetes. Injection of IC improved rat survival by only 40%. Thus, the hybrid tissue-engineered construct (fibrous titanium nickelide scaffold+IC) is biocompatible when administered intraperitoneally, stimulates regeneration in rats with alloxan-induced diabetes, improves blood glucose utilization processes, and restores suppressed leukopoiesis. It is assumed that hepatocytes can be the main target cells of the hybrid tissue-engineering construct.

Osmotic concentration of urine in the dynamics of the development of alloxan-induced experimental diabetes

In order to clarify the peculiarities of the osmotic concentration of urine in the dynamics of the development of alloxan-induced experimental diabetes mellitus (DDM), studies were conducted on 54 sexually mature non-linear male white rats, in which DDM was simulated by a single intraperitoneal injection of alloxan solution (Alloxan monohydrate, "Acros Organics", Belgium) at a dose of 160 mg/kg of body weight after a previous 12-hour food deprivation with preserved access to water. 10, 25, and 45 days after the introduction of the diabetogenic substance, 24 alloxan-diabetic rats, as well as 30 control (intact) animals, were loading with tap water in a volume of 5% of body weight, urine was collected for 2 hours, euthanasia was performed by decapitation under light ether anesthesia. In blood samples, the level of glucose and creatinine was determined, in urine samples, after evaluating the water-induced 2-hour diuresis (in ml/100 g of body weight in 2 hours), the concentration of creatinine was determined, the clearance of endogenous creatinine, the clearance of osmotically free water, as well as relative (tubular) reabsorption of water, determined the content of glucose, urea, its excretion, including per 100 μl of glomerular filtrate, as well as urine osmolarity. The results of the study allow us to state that as the duration of experimental diabetes is prolonged, the pathogenetic significance of hyperfiltration, which determines the speed of fluid movement along the tubule and the intensity of its absorption, weakens in relation to the processes of osmotic concentration of urine, yielding to other factors, such as the osmolarity of the medulla of the kidneys, as well as the presence of substances in the liquid of the distal segment and collecting tubes, the reabsorption of which can change their concentration in the collecting tubes as the urine progresses. In diabetes, in addition to glucose, such substances include urea. Attempts to analyze the renal excretion of urea revealed that changes in its urinary concentration are definitely correlated with the dynamics of changes in urine osmolality. Moreover, it can be assumed that urea transport disorders in the diabetic kidney occur earlier than the ability to excrete osmotically active substances in general. A joint study of the processes of renal transport of urea and urine osmolarity can serve as an early verifier of tubulointerstitial damage. Nevertheless, to increase the reliability of the interpretation of the features of the osmotic concentration of urine in diabetes, we consider it necessary to study the nature of the renal transport of electrolytes (sodium, potassium, calcium, and ammonium).

Swimming exercise modifies oxidative stress in skeletal and cardiac muscles of diabetic rats

Introduction: Oxidative stress is a key factor leading to the deterioration of diabetes. Oxidative stress exacerbates diabetes and induction of the activity of the antioxidant system may be required to prevent this effect. Objetive: The aim of the present study was to evaluate the redox state in the skeletal and cardiac muscles in a diabetes rat model subjected to swimming exercise for 4 weeks. Methods: Wistar rats were divided into four groups: untrained control (C), trained control (T), untrained alloxan-induced diabetes (D), and trained alloxan-induced diabetes (TD). The redox state of the skeletal and cardiac muscles was assessed by analyzing TBARS, -SH groups, H2O2 production, and SOD and catalase activity. The total number of cardiomyocytes and the total area of collagen fibers in the cardiac muscle were measured by histomorphometry. Results: In the Soleus muscles, the TD group showed increased H2O2 levels and catalase activity compared to the T group, and SOD activity compared to the D group. Regarding the red gastrocnemius, the TD group presented higher SOD and lower catalase activities than the D group. Regarding the cardiac muscle, the TD group presented lower TBARS and higher levels of -SH groups and catalase activity than the D group. Swimming exercise decreased hyperglycemia and reduced pathology, as evidenced by the reduced number of cardiomyocytes and the area of collagen fibers. Conclusion: Swimming exercise in diabetic rats controlled hyperglycemia and oxidative damage, and the reduced fibrosis in the cardiac muscle of diabetic rats.