Fig. 2

Serum expression of miR-214 in obese patients and its correlation with DPP4 levels and HOMA-IR. a. Serum expression of miR-214 was decreased in the obese patients compared with the healthy controls, and the lowest levels were observed in the obese cases under IR conditions. b. Serum concentration of DPP4 was increased in the obese patients, especially in the IR cases, compared with the healthy controls. c. A negative correlation between miR-214 expression and the concentration of DPP4 was found (r = − 0.513, P < 0.001). d. The serum expression of miR-214 was negatively correlated with the HOMA-IR of the obese patients with IR (r = − 0.393, P = 0.002)