Effect of PEP on the levels of serum RBP4, Hcy, GA, FFA and 11β-HSD2 of GDM rats. The relative levels of serum RBP4 (A), Hcy (B), GA (C) and FFA (D) among different groups by an ELISA assay. (E) Western blotting was performed to detect the 11β-HSD2 expression in the placental tissue among different groups. (F) Quantitative analysis results of 11β-HSD2 expression from western blotting. (G) The mRNA levels of 11β-HSD2 was assessed by RT-PCR assay in different groups. *P < 0.05, **P < 0.01, ***P < 0.001 vs. control; #P < 0.05, ##P < 0.01, ###P < 0.001 vs. GDM.