Influence of nutritional intervention on children with type 1 diabetes mellitus and DPP-4 in serum

The level of dipeptidyl peptidase-4 (DPP-4) of children with type 1 diabetes mellitus (T1DM) was observed to evaluate the improvement in function of the nutritional intervention. In total, 132 children with T1DM (T1DM group) and 132 healthy children (NC group) based on physical examination admitted to our hospital from September 2014 to June 2015 and were studied. General data of the two groups as well as the concentration of DPP-4 and various biochemical criterion in peripheral serum were collected and analyzed. Compared with NC group, DPP-4 level of T1DM group was obviously increased (P<0.05); after insulin treatment, the serum level of DPP-4 of T1DM group decreased, but was still significantly higher than that of NC group (P<0.05). After 3 months of clinical nutritional intervention, body mass index (BMI) of children with T1DM was significantly reduced compared with data before the treatment (P<0.05). However, the level of DPP-4 appeared unchanged (P>0.05). Pearson's correlation analysis showed that the level of DPP-4 had a positive correlation with diabetic duration, BMI and gamma (γ)-glutamyl transpeptidase for children suffering TIDM (P<0.05). Multiple linear regression analysis showed that BMI may be a factor influencing DPP-4 level in serum of T1DM children. In conclusion, the level of DPP-4 in serum increased, and insulin treatment was able to decrease DPP-4 level in T1DM children. However, clinical nutritional intervention could not improve the level of DPP-4 and BMI may be an influental factor of the DPP-4 level.