Association Between Plasma Dipeptidyl Peptidase-4 Levels and Cognitive Function in Perinatal Pregnant Women with Gestational Diabetes Mellitus.

BACKGROUND Dipeptidyl peptidase -4 (DPP4) is associated with cognitive dysfunction in patients with type 2 diabetes. AIM To assess a possible relationship between serum DPP4 and cognitive function in perinatal pregnant women with gestational diabetes mellitus (GDM). METHODS The study subjects were divided into three groups: GDM group (n = 81), healthy pregnant (HP) group (n = 85), and control group (n = 51). The Montreal Cognitive Assessment (MoCA) was used to assess the cognitive status of each group. Venous blood samples were collected to measure blood lipids, glycated hemoglobin, and glucose levels. For each participant, a 3-mL blood sample was collected and centrifuged, and the serum was collected. Blood samples were stored at -80 C, and DPP4, interleukin-6 (IL -6), and 8-iso-prostaglandin Fla (8iso-PGF2u), and brain -derived neurotrophic factor (BDNF) were detected using ELISA. RESULTS The MoCA scores in the GDM and HP groups were significantly, different from those in the control group in terms of visuospatial/executive function and attention (P < 0.05); however, the scores were not significantly different between the GDM and HP groups (P > 0.05). In terms of language, the GDM group had significantly different scores from those in the other two groups (P < 0.05). In erms of memory, a significant difference was found between the HP and control groups (P < 0.05), as well as between the GDM and HP groups. The levels of DPP4, 1L-6, and 8-iso-PGF2a in the GDM group were significantly higher than those in the HP and control groups (P < 0.05); however, the differences between these levels in the HP and control groups were not significant (P > 0.05). The level of BDNF in the GDM group was significantly lower than that in the HP and control groups (P < 0.05), although the difference in this level between the HP and control groups was not significant (P > 0.05). CONCLUSION Cognitive dysfunction in perinatal pregnant women with GDM mainly manifested as memory loss, which might be associated with elevated DPP4 levels.