EPC were harvested and incubated with vehicle or insulin (0.1, 1, 10 nmol/L).

• 细胞分为对照组(常规M199培养液)和3个胰岛素干预组(在常规M199培养液中分别加入0.；1；1；10nmol/L胰岛素)；干预24h后硝酸酶还原法观察EPC分泌NO量的变化