The Indices of Nitric Oxide System in Rats with Carrageenan-Induced Enterocolitis Combined with Diabetes Mellitus

Changes in the transcriptional activity of the entero-insular axis genes in streptozotocin-induced diabetes and after the administration of TNF-α non-selective blockers

OBJECTIVE

The aim of the present study was to investigate the transcriptional activity of the GLP-1R, DPP-4, SGLT-1, INSR, and IGF-1R genes in GALT cells of rats with streptozotocin-induced diabetes in both untreated and treated with pentoxifylline, as a non-specific blocker of TNF-α.

METHODS

The expression of GLP-1R, DPP-4, SGLT-1, INSR, and IGF-1R genes in GALT cells of rats was studied by real time quantitative polymerase chain reaction.

RESULTS

It was shown that the development of diabetes was accompanied by the decrease of GLP-1R and an increase of DPP-4 genes expression in rat ileum. The administration of pentoxifyl-line to diabetic animals led to an increase in the transcriptional activity of GLP-1R on the 4th week and decrease in transcriptional activity of DPP-4 on the 2nd and 4th weeks of the experiment. An increase in the normalized expression of SGLT-1 on the 4th week of the experimental diabetes was also noted, while the administration of pentoxifylline to diabetic animals did not lead to significant changes in this index. The transcriptional activity of the INSR and IGF-1R genes was reduced in diabetic rats and the administration of the non-specific TNF-α blocker - pentoxifylline led to a significant increase only for INSR gene in animals on the 4th week of the experimental diabetes.

CONCLUSIONS

The expression of incretins, glucose transporters, and pro-inflammatory cytokines (e.g. TNF-α) in immune cells may be used as markers of several autoimmune pathologies progression such as type 1 diabetes due to their effect on the balance of pro- and anti-inflammatory factors.

The Relationship Between Lipid Metabolism and The Level of Albuminuria with Single Nucleotide Polymorphism -204A>C [rs 3808607] CYP7A1 Gene in Patients with Type 2 Diabetes Mellitus and Diabetic Nephropathy

Background and aims. The purpose of our study was to determine the features of diabetic nephropathy, to identify the relationship between the level of albumin excretion, urine and lipid profile, genotype variants of the CYP7A1 gene in people with type 2 diabetes and diabetic nephropathy.

Material and methods. Patients were divided into three groups. Normoalbinuria was detected in group I, and II - microalbuminuria, and III -macroalbuminuria. Determination of albumin to creatinine ratio was more accurate, although more expensive method. We examined single nucleotide polymorphism -204A> C [rs 3808607] of the promoter region of the CYP7A1 gene.

Results. It was established that homozygotes by the major allele with genotype AA had lower values of albuminuria, atherogenic lipoproteins, total cholesterol, triglycerides and higher levels of anti-atherogenic lipoproteins than patients with AС and СС genotypes.

Conclusion. The СС genotype was most unfavorable in the prognostic plan, since homozygotes for this minor allele were characterized by higher values of albuminuria, total cholesterol, triglycerides, and lower values of high-density lipoprotein

Gender-Specific Differences of Oxidative Processes in the Population of Circulating Neutrophils of Rats in a Setting of Prolonged Administration of Monosodium Glutamate

Background and aims: Monosodium salt of glutamic acid (MSG) is one of the most common food additives. The aim of study was to assess, in gender-specific terms, how prolonged administration of MSG effects on reactive oxygen and nitrogen species formation and the apoptotic/necrotic processes in the population of rats circulating neutrophils.

Material and methods: Experimental studies were conducted on 32 mature white rats. MSG was administered intragastrical at a dose of 30 mg/kg body weight for 30 days. The analysis of cell samples to determine neutrophils with overproduction of reactive oxygen species (ROS) and signs of apoptosis\necrosis was evaluated with flow laser cytometry method. The total nitric oxide synthase (NOS) activity was determined by monitoring the rate of conversion of L-arginine into citrulline. The total quantity of NO metabolites was assessed by evaluating of nitrite and nitrate ions.

Results: We found a significant increase in generation of ROS, intensification of nitroxydergic processes, an increase in the percentage of apoptotic neutrophils and no changes in the percentage of necrotic neutrophils.

Conclusions: We observed activation of oxidative and nitroxydergic processes in rats with prolonged administration of MSG, which initiate apoptosis. In gender-specific terms, a more pronounced changes were seen in male rats.

Comparative Study of the Effect of Various Forms of Quercetin on Experimental Diabetes

Background and aims: Diabetes mellitus (DM) is a multifactorial metabolic disorder characterized by hyperglycaemia caused by insulin deficiency or insulin resistance. It is a global public health problem. This study aimed to determine specific pharmacological effect of quercetin in water soluble and liposomal preparations in experimental diabetes mellitus. Material and methods: We examined the effect of Corvitin and Lipoflavone (at the dose of 10 mg / kg body weight) in a comparative study in white rats with type 1 diabetes and type 2 diabetes coupled with obesity. To simulate the forms of diabetes mellitus most analogous to those in humans we used Streptozotocin at the doses of 30 mg / kg and 50 mg / kg. We tested the levels of glucose, glycosylated hemoglobin, C-reactive protein, and interleukins 6 and 4 in the blood. Results: In animals with type 1 and type 2 diabetes Lipoflavone significantly reduces glucose and glycosylated hemoglobin levels compared to the rats treated with Corvitin. When administered to animals with diabetes, the effect of quercetin in liposomal form on the concentrations of IL-6, IL-4 and Creactive protein is also larger compared to the water-soluble form. Conclusions: Water soluble quercetin preparation Corvitin and to a larger extent liposomal preparation of this flavonoid, Lipoflavone, show anti-inflammatory effect and restore key parameters of carbohydrate metabolism in experimental type 1 diabetes mellitus and type 2 diabetes coupled with obesity, reducing blood glucose and glycosylated hemoglobin levels.

Markers of Endogenous Intoxication in Rats with Diabetes Mellitus Combined with Carrageenan-Induced Enterocolitis

Background and aims: Diabetes mellitus (DM) is a significant public health issue, being one of the major contributors to morbidity and mortality in the modern societies. Chronic hyperglycemia produces significant physiological, biochemical, and histological changes in the affected organisms. This study aims to evaluate the markers of endogenous intoxication in rats with diabetes mellitus combined with carrageenan-induced enterocolitis. Materials and methods: Diabetes mellitus was induced by a single intraperitoneal administration of streptozotocin (Sigma Aldrich, USA, at a dose of 60 mg/kg body weight). Carrageenan-induced enterocolitis was modeled by giving the animals free access to 1.0 % solution of carrageenan in drinking water for 1 month. The syndrome of endogenous intoxication was assessed by quantification of low and medium molecular weight substances in blood plasma, red blood cell suspension and urine using extraction-spectrophotometric method. Results: The increase in endogenous intoxication in streptozotocin-induced diabetes combined with chronic enterocolitis can mainly be attributed to the catabolic pool of blood plasma substances of low and medium molecular weight. The index of distribution of low- and medium-molecular-weight substances between blood plasma proteins and glycocalyx of erythrocytes in the experimental groups increased simultaneously with the quantities of investigated fractions in the erythrocyte suspension measured at the wavelengths of 242, 254 and 280 nm. Conclusions: We observed upsurge of endogenous intoxication markers in the rats with diabetes mellitus. Endotoxicosis became even more evident in the rats with diabetes mellitus combined with carrageenan-induced enterocolitis.