The Relationship between Serum Levels of Irisin with Cardiometabolic Biomarkers in Patients with Type 2 Diabetes

Background: Diabetes and obesity are associated with an increased risk of cardiovascular disease. Irisin is a newly recognized peptidic myokine with anti-obesity and anti-diabetic properties. This study aims to investigate the relationship between serum irisin levels with cardiometabolic biomarkers in patients with type 2 diabetes mellitus (T2DM). Methods: In this comparative cross- sectional study, 80 T2DM patients and 80 control participants (adjusted by age, body mass index (BMI), and physical activity) referring to Bou Ali Hospital in Zahedan, Iran, were enrolled. Serum irisin concentrations, anthropometric, and biochemical parameters were assessed. Results: Serum irisin level was significantly lower in T2DM patients compared to control group. Multiple linear regression analysis revealed that after adjustment for age, irisin was negatively associated with waist circumference (WC, P < 0.01) and waist to height ratio (WHtR, P < 0.01), homeostasis model assessment insulin resistance (HOMA-IR, P = 0.009), triglycerides (TG, P = 0.016), and positively associated with high density lipoprotein cholesterol (HDL-c, P = 0.03) in diabetic patients. Conclusion: The findings suggest that irisin can be used as a marker for predicting of obesity-related cardiometabolic biomarkers, insulin resistance, and incidentT2DM.

The effects of green tea on cognitive impairments in the rat model of Alzheimer's disease: protection against inflammatory and oxidative damage

INTRODUCTION

Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by a decrement in the number of synapses, an increment in the production of oxygen free radicals and inflammatory cytokines. Green tea (GT) plays a defensive performance in different neurodegenerative conditions, such as cognition deficit. This study investigated the neuroprotective effect of green tea (GT) on cognitive disorder, inflammation, and oxidative stress in the streptozotocin (STZ)- induced AD model.

MATERIALS AND METHODS

The rats were divided into four groups: (1) Control, (2) GT, (3) Alz, and (4) GT + Alz. AD was induced by the injection of STZ (3 mg/kg, bilaterally, ICV). Morris water maze and passive avoidance tests were done to evaluate the memory and learning of rats. Biochemical parameters were measured with specialized ELISA kits.

RESULTS

Briefly, data analysis revealed that GT administration for 21 days improved memory impairment induced by the injection of STZ. Pretreatment with GT enhanced time spent in the goal quarter and reduced latency time and path length. Furthermore, pretreatment with GT prevented the increment of malondialdehyde (MDA) concentration in STZ-treated rats. As a pro-inflammatory cytokine, tumor necrosis factor- α (TNF-α) concentration was suppressed with the GT pretreatment. Total antioxidant capacity was increased after GT administration in rats treated compared with AD rats.

CONCLUSIONS

GT pretreatment attenuated STZ-induced learning and memory impairment through the suppression of TNF-α and MDA concentrations. The beneficial effects of GT on memory could be attributed to its protective effects on oxidative defenses.

Effect of pre-meal water intake on the serum levels of Copeptin, glycemic control, lipid profile and anthropometric indices in patients with type 2 diabetes mellitus: a randomized, controlled trial

Background

Water pre-load affects insulin secretion by altering the level of copeptin (C-terminal component of the arginine vasopressin hormone (AVP)) and preventing obesity by reducing food intake.

Aims

The present randomized controlled trial (RCT) aimed to investigate the effects of pre-meal water intake on type 2 diabetes Mellitus (T2DM).

Materials and methods

In this study, 40 patients with T2DM were randomly assigned to two intervention groups for 8 weeks; a) drinking 1 liter of water per day before each main meal (PW group)., and b) no water consumption before any meal (NPW group). At the beginning and at the end of the study, blood samples were taken to assess glycemic indices, lipid profile, copeptin and anthropometric indices.

Results

Pre-meal water intake was associated with lower energy intake, BMI, waist circumference (WC) and greater weight loss, in compared with the controls (P < 0.0001) after 8 weeks. At the end of the trial, the concentrations of fasting blood sugar (FBS) (P < 0.0001), triglyceride (TG) (P < 0.05), low-density lipoprotein cholesterol (LDL-C) (P < 0.05) and copeptin (P < 0.05) were significantly reduced following water drinking before meals.

Conclusion

To sum up, the present study revealed that pre-meal water intake is associated with lower BMI, body weight, WC, FBS, TG, LDL-C and copeptin levels in patients with T2DM.