ABSTRACT
Objective To investigate the concentration of interleukin-32 (IL-32) in serum,and the expression of IL-32 mRNA in placenta,subcutaneous fat and great epiploon adipose tissue,and explore the relationship between IL-32 and gestational diabetes mellitus (GDM).Methods The concentrations of serum IL-32 in 42 GDM (GDM group) and 38 non-GDM (control group) pregnant women were examined by enzyme linked immunosorbent assay (ELISA).The level of the IL-32mRNA in the placenta,subcutaneous fat and great epiploon adipose tissue was examined by quantitative realtime reverse-transcription polymerase chain reaction (RT-qPCR).The expression levels of IL-32 protein in the placenta and umbilical cord were measured by immunohistochemical staining (IHC) and analyzed by ImagePro Plus 9.0.Results The serum level of IL-32 in the GDM group was significantly higher than that in the control group [(129.3 ± 5.78) pg/mL vs.(105.6 ± 8.61) pg/mL,P＜0.05].The level of IL-32 mRNA was increased 1.32 and 1.66 fold in the placenta (P＜0.05) and the great epiploon adipose tissue (P＜0.05) from GDM women,compared with that from control group.No significant difference was found in the levels of IL-32mRNA in the subcutaneous adipose tissue between the two groups [(3.78 ± 0.53) vs.(3.61 ± 0.35),P＞0.05].The expression of IL-32 in the placenta from GDM group was 1.27 times higher than that from control group (P ＜0.05).The IL-32 in the umbilical artery and umbilical vein of GDM group increased by 1.30 and 1.32 (P＜0.05).But there was no significant difference of IL-32 expression in the umbilical interstitial between the two groups.Conclusions Overexpression of IL-32 in the serum and tissue may be involved in the pathogenesis of GDM.