Diabetes Mellitus In Wistar Rats Research Articles

High-Density Lipoprotein Is Located Alongside Insulin in the Islets of Langerhans of Normal and Rodent Models of Diabetes.

Recent studies have implicated pre-beta and beta lipoproteins (VLDL and LDL) in the etiopathogenesis of complications of diabetes mellitus (DM). In contrast, alpha lipoprotein (HDL) is protective of the beta cells of the pancreas. This study examined the distribution of HDL in the islets of Langerhans of murine models of type 1 diabetic rats (streptozotocin (STZ)-induced DM in Wistar rats) and type 2 models of DM rats (Goto-Kakizaki (GK), non-diabetic Zucker lean (ZL), and Zucker diabetic and fatty (ZDF)). The extent by which HDL co-localizes with insulin or glucagon in the islets of the pancreas was also investigated. Pancreatic tissues of Wistar non-diabetic, diabetic Wistar, GK, ZL, and ZDF rats were processed for immunohistochemistry. Pancreatic samples of GK rats fed with either a low-fat or a high-fat diet were prepared for transmission immune-electron microscopy (TIEM) to establish the cytoplasmic localization of HDL in islet cells. HDL was detected in the core and periphery of pancreatic islets of Wistar non-diabetic and diabetic, GK, ZL, and ZDF rats. The average total of islet cells immune positive for HDL was markedly (<0.05) reduced in GK and ZDF rats in comparison to Wistar controls. The number of islet cells containing HDL was also remarkably (p < 0.05) reduced in Wistar diabetic rats and GK models fed on high-fat food. The co-localization study using immunofluorescence and TIEM techniques showed that HDL is detected alongside insulin within the secretory granules of β-cells. HDL did not co-localize with glucagon. This observation implies that HDL may contribute to the metabolism of insulin.

Determination of molecular mechanisms of development and course of experimental diabetes mellitus in Wistar rats

The development and progression of diabetes involves several molecular mechanisms, in particular: insulin resistance, dysfunction of beta cells, inflammatory processes. These mechanisms can disrupt insulin signaling pathways, contribute to beta-cell apoptosis, and are not necessarily dependent on the intervention of cytokines and chemokines. Additionally, genetics play a role, as some forms of diabetes are caused by genetic mutations affecting insulin production or sensitivity. The molecular mechanisms underlying the development and progression of diabetes are complex and encompass various aspects of the body’s physiology and biochemistry. Understanding these mechanisms is crucial for the development of effective methods for treating and preventing diabetes. The aim of the work is analysis of the expression of genes, related to diabetes in pancreatic tissue samples of Wistar rats. Materials and methods. The polymerase chain reaction method with real-time reverse transcription was used to analyze gene expression using the RTI Profiler™ PCR Array Rat Diabetes kit (QIAGEN, Germany), where the pancreas was the object of research in experimental animals. Results. RTI Profiler™ PCR Array Rat Diabetes profiles the expression of 84 genes, associated with the onset, development, and progression of diabetes. The panel contains genes that contribute to obesity, insulin resistance, early-onset diabetes, and its late complications. These genes are represented by functional categories: receptors, transporters, and channels; nuclear receptors; metabolic enzymes; secretion factors; signal transduction proteins; transcription factors. According to the PCR results of the study of the control group of animals and animals with experimental diabetes, we established the activity of the Nkx2-1 genes; Pik3r1; Slc14a2 with high expression compared to control animals. Conclusions. The Nkx2-1 gene has been implicated in the pathogenesis of diabetes, as evidenced by its high expression activity compared to the control group of animals. Additionally, the Pik3r1 protein shows elevated expression levels in the group of animals with experimental diabetes. These changes are believed to be part of a compensatory mechanism aimed at preserving the cellular function of the pancreatic endocrine system. Furthermore, the observed increase in Slc14a2 protein expression likely indicates the onset of late complications associated with kidney pathology in the course of diabetes.

Effect of Breadfruit Leaf Extract on Sperm Quality in Diabetic Male Wistar Rats

Background: Diabetes mellitus can lead to various complications, one of the most devastating complications is infertility. Meanwhile, the antioxidant compounds of breadfruit leaves have been shown to help heal oxidative stress and therefore prevent infertility in diabetic patients. Therefore, this study aimed to determine the effect of breadfruit leaves in improving sperm quality parameters in male diabetic Wistar rats.Methods: In this study, twenty four male rats were used and were classified into four groups. Two of the four groups were alloxan-induced diabetics and were treated with a graded dose of breadfruit leaf extract. The two control groups received no therapy and the treatment was administered for 30 days. The rats were terminated after day 31 and sperm concentration, morphology, motility, and spermatogenesis were examined. Result: The results showed that breadfruit leaves increase sperm quality parameter levels compared to the control groups. The group that received a 400 mg/kg dose of breadfruit leaves showed the most significant improvement in terms of the level of sperm parameters compared to the other group that received a dose of 100 mg/kg breadfruit leaves. Conclusions: The protective effect of breadfruit leaves significantly reduced sperm damage caused by diabetes mellitus in Wistar Rats.

Therapeutic Potential of Metformin-preconditioned Mesenchymal Stem Cells for Pancreatic Regeneration.

Diabetes occurs due to insulin deficiency or less insulin. To manage this condition, insulin administration as well as increased insulin sensitivity is required, but exogeneous insulin cannot replace the sensitive and gentle regulation of blood glucose levels same as β cells of healthy individuals. By considering the ability of regeneration and differentiation of stem cells, the current study planned to evaluate the effect of metformin preconditioned buccal fat pad (BFP) derived mesenchymal stem cells (MSCs) on streptozotocin (STZ) induced diabetes mellitus in Wistar rats. The disease condition was established by using a diabetes-inducing agent STZ in Wistar rats. Then, the animals were grouped into disease control, blank, and test groups. Only the test group received the metformin-preconditioned cells. The total study period for this experiment was 33 days. During this period, the animals were monitored for blood glucose level, body weight, and food-water intake twice a week. At the end of 33 days, the biochemical estimations for serum insulin level and pancreatic insulin level were performed. Also, histopathology of the pancreas, liver and skeletal muscle was performed. The test groups showed a decline in the blood glucose level and an increase in the serum pancreatic insulin level as compared to the disease group. No significant change in food and water intake was observed within the three groups, while body weight was significantly reduced in the test group when compared with the blank group, but the life span was increased when compared with the disease group. In the present study, we concluded that metformin preconditioned buccal fat pad-derived mesenchymal stem cells have the ability to regenerate damaged pancreatic β cells and have antidiabetic activity, and this therapy is a better choice for future research.

Effect of silymarin on the parameters of oxidative stress in hearts in the course of diabetes mellitus in Wistar rats

Chronic hyperglycemia is one of the most important causes of the formation of oxygen free radicals in diabetes, which damage various organs. Damage to proteins and lipids in the heart can lead to the development of diabetic cardiomyopathy, which in turn may cause cardiovascular failure. In order to counteract oxidative stress, the innate antioxidant mechanisms of the system should be supported by supplementation with exogenous antioxidants, for instance of plant origin. In this experiment, the role of silymarin, a plant-derived flavonolignan on the oxidative stress parameters and oxidative damage markers in the hearts was determined in an experimental model of diabetes. Male Wistar rats were injected with streptozotocin at a dose of 60 mg/kg (ip). Then, silymarin was administered at doses of 50 and 100 mg/kg for four weeks via a gastric tube. In diabetic animals an increase in malondialdehyde, advanced oxidation protein products, as well as increased activity of antioxidant enzymes in heart tissues was noted. Administration of silymarin inhibited oxidative stress by increasing the total antioxidant response, decreasing the concentration of malondialdehyde and advanced oxidation protein products and a slight increase in the level of glutathione. It can be concluded that the redox state in the examined tissue improved. Based on the results in can be concluded that silymarin demonstrates a potential in preventing the development of oxidative damage in the heart tissue in the course of experimental diabetes.

Hepatoprotective effect of Carica pubescens juice and rutin through improving the Adenosine Monophosphate-activated Protein Kinase (AMPK) pathway in type 2 diabetes Mellitus Wistar Rats

Insulin resistance in type 2 diabetes mellitus (type 2 DM) results in disturbing glucose transport into the cells and increases glucose production in the liver and exacerbates hyperglycemia. It is also correlated with a decrease of adenosine monophosphateactivated protein kinase (AMPK) expression that has effects on insulin resistance aggravation, antioxidant capacity impairment, and glucose-lipid homeostasis disturbance indicates AMPK as a significant target for type 2 DM prevention and treatment. The flavonoid content of Carica pubescens (CP) fruit contains anti-hyperglycemic and antihyperlipidemic properties, however, there is no study about its effect on AMPK expression. This study aimed to investigate the effect of CP fruit juice and rutin on preventing liver damage in type 2 DM through the pathway of AMPK, superoxide dismutase (SOD), high-density lipoprotein (HDL), and triglyceride (TG). The experimental design was a post-test only control group. The immunohistochemical method was used to examine AMPK expression in 25 liver paraffin blocks from five groups of male Wistar rats: C1 = negative control; C2 = type 2 DM; C3 and C4 = type 2 DM given fruit juice at a dosage of 4 g CP/200 g BW/day and 8 g CP/200 g BW/day, respectively; and C5 = type 2 DM given rutin 10 mg/200 g BW/day, for 30 days treatment. AMPK expression in the liver significantly increased in the C3, C4, and C5 compared to the C2 group (p&lt;0.05). There was no significant variation in AMPK expression among C3, C4, or C5, showing that C1 possesses the same capabilities as C4 and C5 groups. The increase in AMPK expression was followed by SOD and HDL levels and lower TG levels. However, a significant correlation was shown in the TG level only. This indicates CP fruit juice and rutin can act as a hepatoprotective to prevent liver damage through the AMPK pathway due to type 2 DM conditions.

Accelerated Wound Healing Potential of Nisin in Streptozotocin Induced Diabetes Mellitus in Wistar Rats

Accelerated Wound Healing Potential of Nisin in Streptozotocin Induced Diabetes Mellitus in Wistar Rats

The Role of an Aqueous Extract of Cactus on Histopancreatic Architecture in Streptozotocin Induced Diabetes Mellitus in Wistar Rats

Herbs have been used as medicinal for several years to cure or rather manage different ailments such as diabetes mellitus. This is very common in rural settings of sub-saharan Africa and is now being adopted in urban areas. Opunta species have widely been seen to contain antihyperglycaemic effects. To evaluate the antihyperglycaemic and histopancreatic effect of aqueous extract of prickly pear cactus (Opuntia species) cladodes in streptozotocin-induced diabetic male Wistar rats in vivo. This was a laboratory based research conducted at Mulungushi University involving 30 wistar rats (Rattus norvegicus) that weighed between 160-200 g which were randomly selected into five groups (6 per cage); normal control, diabetic control, diabetic +metformin, diabetic +cactus and cactus only group. Initial blood glucose levels were obtained from the tail and record then Diabetes mellitus was induced using a single intraperitoneal dose of streptozotocin (70mg/kg BW) and established a persistent state of hyperglycemia after 72hours. The aqueous cactus extract of 100 mg/kg BW and metformin of 100 mg/kg BW was administered orally using intragastric cannula daily for a period of 4 weeks. At the end of the fourth week, Diabetes + cactus and diabetes + metformin groups body weights were statistically significant when compared to the diabetic group (P&lt;0.05). While diabetic group was statistically significant when compared to normal control (P&lt;0.05). The relative weight of the pancreas in diabetic group was statistically significant to other groups (P&lt;0.05). The blood glucose in diabetic + cactus was normoglycaemic at 3rd week, Diabetic + metformin group when compared to diabetic group was statistically significant (P&lt;0.05). The normal control and cactus only groups maintained normoglycaemic till the end of the 4th week. The histological findings of the normal control and cactus only group showed normal pancreatic cytoarchitecture. Diabetes group showed high degree of disorganization in the cytoarchitecture in the islet with reduction in β cell mass and deposition of elastic fibres. The Diabetic+Metformin group showed slight decrease in the cell mass (β cells) and elastic fibres were extensively deposited. Diabetic+Cactus treated group exhibited normal histology of the pancreas with increased number of β cells. Opuntia species are able to lower elevated blood glucose levels and ameliorate the effects of STZ on the pancreatic morphology

Antidiabetic activity of Ayurvedic polyherbal formulations Avipattikara Churna and Triphla Churna in streptozotocin and nicotinamide induced diabetic wistar rats

Objective : The aim of the present study is to formulate a polyherbal formulation whose formula is given in AFI and evaluate its antidiabetic potential in animals. Method: The polyherbal formulation was prepared using the methanol extracts and aqueous extracts of the given parts of herbs in AFI. The quality of the finished product was evaluated as per the World Health Organization’s guidelines for the quality control of herbal materials. The quality testing parameters of the polyherbal formulation were within the limits. Results : The acute toxicity studies of the polyherbal formulation did not show any toxic symptoms in doses up to 2000 mg/kg over 14 days. The extracts of both the formulations were evaluated for In-vitro and In-vivo anti-diabetic study. The oral anti-diabetic activity of the polyherbal formulation (200 and 400 mg/kg, p.o) was screened against intraperitoneal (i.p.) STZ (35 mg/kg) 15 min after i.p. administration of nicotinamide (200 mg/kg) continuously for 2 days, to induced diabetes mellitus in Wistar rats. The investigational drug was administered for 28 consecutive days, and the effect of the polyherbal formulation on blood glucose levels was studied at regular intervals.

Anti-diabetic and wound healing potential of Benincasa hispida in streptozotocin-induced diabetic rats

Benincasa hispida (B.hispida) is a potential bioactive herb with a wide range of pharmacological actions. Diabetes wound healing effect of effect of B.hispida is not clear. Hence the study was planned to investigate the antidiabetic and wound healing activities of methanolic and petroleum ether of B.hispida on streptozotocin-induced diabetes mellitus in Wistar rats. Diabetes was induced by a single intra peritoneal injection of Streptozocin (60mg/kg). The antidiabetic activity was studied at 50, 100 and 200 mg/kg body weight (BW) of plant extracts. In this study, STZ intoxicated rats displayed increased blood glucose level, lipid peroxidation and decreased level of antioxidants. Further, lipid profiles such as total cholesterol, triglycerides, LDL and VLDL were significantly increased and HDL was significantly decreased in STZ diabetic rats. Treatment with B.hispida methanolic and petroleum extracts at the dose of 100 and 200mg/kg showed significant antidiabetic activity. Further, in wounded rats, B.hispida significantly increased the wound contraction rate and shorten the period of epithelization. In conclusion, B.hispida showed a significant antidiabetic and wound activities mediated through its antioxidant effect.

A modified protocol of the alloxan technique for the induction of diabetes mellitus in Wistar rats

The chemical induction of diabetes mellitus in Wistar rats using alloxan is a commonly adopted scientific method for obtaining experimental models. Although a wide variety of induction protocols have been reported, no standard protocol has been defined due to high mortality rates, reversal, and failure of induction. Therefore, this study proposes an adaptation of the technique to induct diabetes mellitus through a 30-hour fast and a 150 mg/kg dosage of alloxan. The proposed technique has proved to be highly effective.

Swertiamarin and quercetin combination ameliorates hyperglycemia, hyperlipidemia and oxidative stress in streptozotocin-induced type 2 diabetes mellitus in wistar rats

Ethnopharmacological relevanceSwertiamarin (Sw) and quercetin (Qu) have been isolated from different plants and are reported for their antidiabetic activities. The plants from which swertiamarin and quercetin were isolated are also traditionally used in the treatment of diabetes mellitus. Aim of the studyThe present study is aimed to evaluate the synergistic effect of a combination of swertiamarin and quercetin (CSQ) on α-amylase in vitro and on streptozotocin (STZ) induced diabetes mellitus in vivo. MethodsSwertiamarin was isolated from the plant Enicostemma axillare and quercetin was procured in its pure form. Sw, Qu and CSQ were evaluated for in vitro α-amylase inhibitory activity. Based on the in vitro study results, CSQ was assessed for in vivo streptozotocin induced diabetes mellitus in Wistar rats. The effect of CSQ on blood glucose levels, body weight, serum biochemical parameters and antioxidant enzymes such as glutathione (GSH), superoxide dismutase (SOD), catalase, glutathione peroxidase (GPx) and lipid peroxide levels were estimated. The histopathological observations of pancreatic tissues were also made. ResultsThe purity of swertiamarin was confirmed by HPLC. The results showed that CSQ was found to possess high percentage of inhibition in an in vitro α-amylase inhibitory study. In a STZ-induced type 2 diabetes mellitus (T2DM), body weight of rats in CSQ treated and control groups were unaltered. A marked reduction in the blood glucose levels was observed in the CSQ treated groups on 14th and 28th day. Decrease in the levels of low-density lipoprotein (LDL), triglycerides, total cholesterol and an increase in high-density lipoprotein (HDL) cholesterol level was observed in a dose dependant in CSQ treated groups. However, CSQ treated groups could significantly improve antioxidant protection by increasing the levels of serum GSH, SOD, Catalase and GPx and decreasing the levels of lipid peroxide (p < 0.05). In the histopathological study, the pancreatic islets of Langerhans and vacuolization have shown significant increase in both the treated groups. ConclusionsThe combination of swertiamarin and quercetin (CSQ) has proven a preventive and therapeutic effect against T2DM and suggests that this is a potential combination of phytoconstituents for excellent hypoglycemic activity in T2DM.

Arachidonic Acid Has Anti-Inflammatory and Anti-Diabetic Actions In Vitro and In Vivo

Abstract Objectives To evaluate the effect of arachidonic acid (AA) in the pathobiology of chemical-induced type 1 and type 2 diabetes mellitus in experimental animals. Methods In vitro studies were performed using RIN 5F cells and animal studies in 3–4 week old Wistar rats. Alloxan and streptozotocin (STZ) were used to induce type 1 diabetes and STZ employed to induce type 2 diabetes mellitus. RIN5F cell proliferation was measured using MTT assay. Establishment of alloxan and STZ-induced diabetes in animals was confirmed by measuring plasma glucose levels. Plasma insulin, IL-6, TNF levels were measured by ELISA. Expression of cyclo-oxygenase-2, lipoxiygenase, NF-kB and IkB genes was performed in pancreatic and adipose tissues. Results Alloxan and STZ-induced cytotoxicity to RIN5F cells was inhibited by arachidonic acid that was not blocked by both COX and LOX enzymes. Alloxan and STZ-induced type 1 diabetes mellitus and STZ-induced type 2 diabetes was prevented by arachidonic acid treatment. Plasma levels of glucose, insulin, IL-6 and TNF and expressions of NF-kB, IkB, COX-2, LOX in pancrreatic and adipose tissues and lipocalin-2 in adipose tissue were restored to normal by arachidonic acid treatment. AA treatment enhanced plasma lipoxin A4 (LXA4) levels. LXA4 also prevented both type 1 and type 2 diabetes induction by STZ. Conclusions AA prevented the development of both type 1 and type 2 diabetes mellitus in Wistar rats and protected pancreatic beta cells form the cytotoxicity of alloxan and STZ. AA showed strong anti-inflammatory actions. AA seems to bring about its anti-inflammatory and anti-diabetic actions by enhancing LXA4 formation. Funding Sources None.

Orally deliverable nanoformulation of liraglutide against type 2 diabetic rat model

The present study was designed to evaluate the hypoglycemic effect of nanoparticle based drug delivery system of liraglutide loaded in Poly lactic-co-glycolic acid (PLGA) nanoparticles (NPs) upon oral delivery in experimentally induced type 2 diabetes mellitus in Wistar rats. NPs were synthesized using double emulsion solvent evaporation method. Physiochemical characterization of NPs revealed small particle size of 159.25 ± 24.46 nm with 75 ± 7.8% liraglutide encapsulation efficiency and 7 ± 1% as liraglutide loading efficiency. The NPs were also studied for in vitro release study and stability studies in various gastrointestinal fluid pH conditions which demonstrated the stability of NPs under these conditions. In-vivo model in wistar rats induced by high fat diet (HFD) along with Streptozotocin (STZ) were treated with liraglutide NPs for 8 weeks at two doses (75 and 150 μg/kg, orally). The rats were monitored for various biochemical and physiological parameters at regular intervals i.e. baseline before initiation of the experiment, at the 1st, 5th, and 9th week of STZ administration. Further in vivo study showed alleviation of HFD-STZ induced diabetes mellitus as evident from the reduction in biochemical parameters like blood glucose (both fasting and post prandial blood glucose), HbA1c, fructosamine levels, serum triglycerides, serum total cholesterol. Physiological parameters such as body weight and food intake were also in support of the data. Moreover, liraglutide NPs demonstrated hypoglycemic activity by significantly increasing the insulin secretion in diabetic rats. To the best of our knowledge, we for the first time proposing the orally deliverable NPs of liraglutide that ameliorates HFD-STZ induced diabetes mellitus effectively as compared to conventional liraglutide.

The role of liquid smoke coconut shell in the proliferation phase of an oral traumatic ulcer

Context: Liquid smoke coconut shell (LS-CS) contains phenolic compounds that are able to promote wound healing by interfering with the inflammation phase of wound healing. The homeostatic mechanism that decreases the inflammation releases a growth factor that enhances proliferation by increasing fibroblast growth factor-2 (FGF-2), vascular endothelial growth factor (VEGF) expression and fibroblast proliferation. Aims: To analyze the role of LS-CS in the proliferation phase of oral traumatic ulcer healing by analyzing fibroblast numbers and FGF-2 and VEGF expressions. Methods: Oral traumatic ulcers were induced in diabetes mellitus Wistar rats via an alloxan injection. A traumatic ulcer as long as 10 mm was made in the inferior fornix incisive labial area. The oral traumatic ulcer was then topically treated with LS-CS using a dose of 20 μL/ 20 g body weight once daily for three, five and seven days. The fibroblast number of the oral traumatic ulcers’ tissue was then analyzed using hematoxylin-eosin, and the FGF-2 and VEGF expression were analyzed via immunohistochemistry staining. The difference in fibroblast numbers and FGF-2 and VEGF expressions were analyzed by one-way ANOVA and post hoc tests with a significance of p&lt;0.05. Results: The LS-CS affected fibroblast numbers (p=0.001) and FGF-2 expression (p=0.000) after topical treatment for seven days. There was a significant difference in the expression of VEGF after topical treatment with LS-CS for five days compared to the control group (p=0.000) and benzydamine hydrochloride (p=0.005). The topical treatment of LS-CS for seven days affected the expression of VEGF compared to the control group (p=0.000) and benzydamine hydrochloride (p=0.019). Conclusions: LS-CS could improve the healing of oral traumatic ulcers by increasing fibroblast numbers and FGF-2 and VEGF expression after seven days of treatment.

The Effect Of Giving Okra (Abelmoschus Esculentus) Extract On The Increase Of Vascular Endhothelial Growth Factor (Vegf)

Background: People with diabetes mellitus who perform tooth extraction related to the complications that disrupt the process wound healing. Diabetics have persistent inflammatory phase and abnormal angiogenesis in proliferation phase. Treatment for people with diabetes mellitus is done through increase VEGF. Herbal medicine that use extracts from plants have benefits in wound healing processes such as okra fruit extract because it contains flavonoids. Flavonoids in accelerating wound healing in patients diabetes mellitus can through its role as anti-diabetic, anti-inflammatory and antioxidant. This plays a role in the persistent inflammatory resolution process leading to proliferation by macrophages and immunomodulatory effects of macrophage function in issuing growth factors. Objective: To prove okra fruit extract (Abelmoschus esculentus) influences the increase in VEGF expression in the process of healing wounds from tooth extraction of diabetes mellitus Wistar rats. Method: Laboratory experimental research with randomized post test only The control group used 24 Wistar mice which were divided into two groups namely the control group (STZ induction) and the treatment group (STZ induction by giving okra fruit extract). Tooth extraction is done on the incisors left lower jaw. 4 mice from each group were sacrificed on day 3, 5 and 7 after revocation. A Socket is cut for inspection immunohistochemistry. Results: VEGF expression of the control group compared to the group the treatment showed significant results (p &lt;0.05). Conclusion: Administration of extracts okra (Abelmoschus esculentus) has the effect of increasing expression VEGF in the healing process of wistar tooth extraction wounds with diabetes mellitus.

A Low Molecular Weight Nerve Growth Factor (NGF) Mimetic Given Per OS Increases the Survival of Pancreatic β-Cells in a Streptozotocin Model of Diabetes

We present here results of studies of the antidiabetic activity of compound GK-2 (bis-(N-monosuccinyl-glutamyl-L-lysine) hexamethylenediamide), an NGF mimetic, in a model of streptozotocin-induced type 2 diabetes mellitus in Wistar rats. Two-week prophylactic courses of oral GK-2 did not decrease blood glucose levels in healthy animals but reduces the severity of hyperglycemia and eliminated the insulin resistance effect induced by streptozotocin. Morphological analysis of the pancreas of the animals using monoclonal antibodies to insulin showed that while streptozotocin decreased the number of insulin-producing cells in the pancreas, GK-2 produced a statistically significant reduction in this harmful effect and promoted recovery of pancreatic islet size. A strong correlation was found between the extent of the cytoprotective action as indicated by morphometric measures and the strength of the hypoglycemic effect.

Arachidonic acid-rich ARASCO oil has anti-inflammatory and antidiabetic actions against streptozotocin + high fat diet induced diabetes mellitus in Wistar rats.

The aim of this study was to investigate the effects of arachidonic acid (AA)-rich ARASCO oil on high-fat diet (HFD) + streptozotocin (STZ)-induced diabetes mellitus in male Wistar rats and its possible mechanisms of action. Male Wistar rats with HFD + STZ-induced diabetes were employed in the present study. ARASCO oil was administered orally for the first 7 d consecutively, followed by once weekly throughout the study (14 wk). At various time points, blood glucose and body weight and oral glucose tolerance tests were measured. At the end of the study, animals were sacrificed to collect plasma and various organs and stored at -80°C. Plasma insulin, tumor necrosis factor-α, interleukin-6, and lipoxin A4 were measured. Expression of the following genes was determined: nuclear factor-κΒ (NF-κB), cyclooxygenase-2 (COX-2), 12-lipoxygenase (12-LOX) in pancreas and lipocalin 2 (LPCLN2) in adipose tissue. Various antioxidants were measured in the plasma and other tissues. Area under the curve and insulin sensitivity index were assessed by computing homeostatic model of assessment for insulin resistance, quantitative insulin check index, Matsuda, and Belfiore indices. ARASCO oil treatment decreased hyperglycemia, restored insulin sensitivity, suppressed inflammation, enhanced plasma lipoxin A4 levels, and reversed altered antioxidant status to near normal in animals with HFD + STZ-induced diabetes. These results suggest that ARASCO, a rich source of AA, can prevent HFD + STZ-induced diabetes in Wistar rats owing to its anti-inflammatory action. It remains to be seen whether ARASCO oil is useful in preventing or postponing the development of type 2 diabetes mellitus in humans.

Molecular Triad RANK/ RANKL/ OPG in Mandible and Femur of Wistar Rats (Rattus norvegicus) With Type 2 Diabetes Mellitus

A successful treatment of dental implant needs a good jaw bone support, which depends on healthy bone metabolism. Bone metabolism can be affected by Diabetes Mellitus (DM). It may trigger various complications, including osteoporosis. Molecular triads consisting of Receptor Activator of NF-kappaB (RANK), Activator of nF-κB Ligand (RANKL), and osteoprotegerin (OPG), have an important role in the formation, function, and osteoclast survival. In this study, molecular triads were observed on mandible and femur bones in type 2 DM Wistar rats. The aim of this study was to observe the molecular triad RANK / RANKL / OPG expressions in type 2 DM Wistar rats. This laboratory research used 18 male Wistar rats divided into three groups: nondiabetic group (control), uncontrolled DM injected with single dose of Streptozotocin (STZ), and controlled DM treated with Metformin. On day 20, the mandible and femur were collected and specimen processing was carried out. The results of RANK / RANKL / OPG expressions were obtained from immunohistochemical staining. In both mandible and femur groups, RANK, RANKL, OPG expressions showed no difference between the control and uncontrolled DM groups. RANKL / OPG ratio in uncontrolled DM was higher than that in the control group. RANK expression was lower in uncontrolled DM group compared with controlled DM, and the RANKL expression in uncontrolled DM group was higher than that in the controlled DM group. RANKL / OPG ratio was lower in the controlled DM group. The study suggested that DM affects resorptive activity in mandible and femur bones which can be observed via RANK/RANKL/OPG.

Antidiabetic Activity of Afobazole in Wistar Rats.

Using the streptozotocin model of type 2 diabetes mellitus in Wistar rats, we compared antidiabetic activity of anxiolytic Afobazole with that of metformin. Afobazole in a dose of 10 mg/kg reduced streptozotocin-induced hyperglycemia and polyphagia and prevented accumulation of malonic dialdehyde, being not inferior to metformin in a dose of 300 mg/kg, and was even more effective than metformin in body weight recovery, elimination of polydipsia, and preservation of these effects after treatment withdrawal.