Objective To investigate the correlations between serum osteocalcin level and insulin resistance and islet beta cell function in patients with type 2 diabetes mellitus. Methods The study was conducted in 403 hospitalized patients with type 2 diabetes. Their general information including gender, age, height, weight, medical history, etc. were recorded. The levels of OC, Ca, Mg, P, PTH, 25 (OH) D, FBG, FINS, HbA1c and 2hBG and 2hINS after the glucose tolerance test were detected. Their BMI, HOMA-IR and HOMA –β were calculated. The participants were grouped by age, sex, BMI and osteocalcin level to compare their metabolic status. According to the median level of osteocalcin, the participants were divided into low osteocalcin group (OL group, n= 201) and high osteocalcin group (OH group, n= 202). The correlations between serum osteocalcin level and insulin resistance and islet beta cell function were analyzed. Results The level of Ca in the younger age group was higher than that in the older age group (P < 0.05). The level of OC (Z = 4.596, P< 0.001), PTH (Z = 3.150, P= 0.002) and P (t = 5.258, P< 0.001) were higher in females than males (P < 0.05). The level of 25 (OH) D in males was higher than that in females (Z = 3.196, P= 0.001). The level of 25 (OH) D in the obese group was lower than that in overweight group and normal weight group (P< 0.05). The level of OC in the overweight group was lower than that in the normal weight group (P < 0.05). In OL group, HbA1c (t = 4.479, P< 0.001), FBG (Z = 3.579, P< 0.001) and 2hBG (Z = 4.413, P< 0.001) were higher than those in OH group (P < 0.05). The 2hINS (Z = 3.482, P< 0.001) and HOMA-β (Z = 2.397, P= 0.017) in OL group were lower than those in OH group (P < 0.05). The level of OC was positively correlated with 2hINS (r = 0.152) and HOMA-β (r = 0.121), but was negatively correlated with HbA1c (r = -0.244), FBG (r = -0.176) and 2hBG (r = -0.241) (P < 0.001). Conclusion Patients with type 2 diabetes showed differences in bone metabolic?markers, and there were significant correlations between serum OC and blood glucose metabolism. OC may participate in glycemic regulation by improving the function of islet beta cells and promoting insulin secretion. |