[Influence of interleukin-10 on nitric oxide /nitric oxide synthase system of the aorta]

To study the influence of the inflammatory factor---interleukin-10 on nitric oxide (NO) and nitric oxide synthase system of rat aorta, Griess assay, production of (3)H-citrulline and Western blot were used to determine the release of NO, and the activity and expression of nitric oxide synthase, respectively. The results showed that lipopolysaccharide (LPS) stimulated the activity of inducible nitric oxide synthase (iNOS) and the release of NO. 10(-10) 10(-8) g/ml of IL-10 induced the activity and expression of endothelial nitric oxide synthase (eNOS), but not of iNOS. 10(-9) 10(-8) g/ml of IL-10 also downloaded the release of NO, and the activity and expression of iNOS induced by LPS, while 10(-7) g/ml of IL-10 significantly stimulated the activity and expression of iNOS but not eNOS. In summary, IL-10 presents a duple role in NO/NOS system. On the one hand, IL-10 inhibits the activity and expression of iNOS induced by inflammatory factor; on the other hand, IL-10 stimulates the release of endothelial NO.