AIM:To investigate whether Janus kinase/signal transducer and activator of transcription( JAK/STAT) signaling pathway mediates high glucose-induced damage in human umbilical vein endothelial cells( HUVECs).METHODS:The cell viability was examined by CCK-8 assay.The expression levels of JAK2,STAT3,caspase-9 and endothelial nitric oxide synthase( e NOS) were detected by Western blot.The intracellular levels of reactive oxygen species( ROS) were tested by DCFH-DA staining followed by photofluorography.Mitochond...