Background: Resistin reduces tissue sensitivity to insulin and causes hyperglycemia. Diabetic nephropathy is also a metabolic disorder caused by chronic hyperglycemia that causes kidney dysfunction. Objectives: This study aimed to investigate the relationship between serum resistin and diabetic nephropathy in diabetic patients who referred to Imam Reza Hospital in 2018 - 2019. Methods: This case-control study recruited 30 diabetic patients with nephropathy, 29 non-nephropathy diabetic patients, and 30 healthy controls via convenience sampling. Serum and 24-hour urine samples were taken from each person. After the determination of the glomerular filtration rate, samples were tested in a laboratory. Also, data were analyzed by SPSS software version 23, and P < 0.05 was considered significant. Results: Mean serum resistin was significantly different between the groups (F = 3.600, P = 0.032). Tukey’s follow-up test showed that resistin was critically higher in the diabetic nephropathy group than in the control group and healthy controls. There was a weak inverse relationship between glomerular filtration rate and serum resistin level (r = -0.233, P = 0.031). Conclusions: Levels of resistin may rise in people with diabetes associated with nephropathy. It seems that Serum resistin can be used as a biomarker to assess the severity of diabetes mellitus.

Background: Type 2 diabetes and thyroid disorders cause extensive changes in insulin resistance. An increase in serum resistin level is associated with insulin resistance. Objectives: The current study aimed to investigate the cumulative effect of diabetes and hypothyroidism on the serum resistin levels of type 2 diabetic patients. Methods: Participants were divided into four groups using the convenience sampling method. Each group contained 30 diabetic patients, 32 hypothyroid patients, 30 diabetics + hypothyroid patients, and 29 healthy individuals. Serum samples were taken from participants and their serum resistin levels were measured. Data were collected and analyzed using SPSS version 23. Pearson correlation test, ANOVA statistical analysis, and Tukey post hoc test were used to analyze the data. A P-value of < 0.05 was used as statistically significant. Results: Among patients with hypothyroidism, resistin, and thyroid-stimulating hormone were moderately correlated (P = 0.001, r = 0.580). ANOVA revealed a statistically significant difference between the resistin levels in the studied groups (P = 0.000, F = 6.813). Conclusions: Serum resistin levels are significantly lower in people with diabetes + hypothyroidism than in people with only one of these two conditions. Therefore, the cumulative effect of diabetes and hypothyroidism on resistin levels cannot be deduced from the findings of the present study.