51. Interleukin-10 stimulation of endogenous nitric oxide release from human saphenous veins diminishes immunocyte adherence.
- Author
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Stefano GB, Christensen VB, Tonnesen E, Liu Y, Hughes TK Jr, and Bilfinger TV
- Subjects
- Aged, Antibodies immunology, Cell Adhesion immunology, Down-Regulation, Endothelium, Vascular immunology, Granulocytes immunology, Humans, In Vitro Techniques, Interleukin-10 blood, Middle Aged, Monocytes immunology, Nitric Oxide Synthase antagonists & inhibitors, Saphenous Vein immunology, Saphenous Vein metabolism, Endothelium, Vascular physiology, Granulocytes physiology, Interleukin-10 immunology, Monocytes physiology, Nitric Oxide biosynthesis, Saphenous Vein physiology
- Abstract
Interleukin-10 (IL-10) is described as a cytokine that exerts immune downregulating actions. In this regard, our study indicates that IL-10 activity on human saphenous veins is coupled to nitric oxide (NO) release. We demonstrated this phenomenon by using in vitro real-time amperometric measurement of NO levels in explanted human saphenous veins after IL-10 exposure. IL-10-induced NO release can inhibit the adherence of monocytes (75.7 +/- 15 cells/600 microm2 of endothelial surface) and granulocytes (65 +/- 18 cells/600 microm2 of endothelial surface) from control values (250-300 cells/600 microm2 of endothelial surface; p < 0.005). This inhibition is directly sensitive to NO synthase inhibition. The specificity of the IL-10 effects is shown by its sensitivity to antibody. In vivo measurement of IL-10 levels during and after cardiopulmonary bypass surgery indicated that they are higher at 6 h after skin closure (1,400 pg/ml) compared with levels found during surgery (300 pg/ml). We surmise that the postsurgical increase of IL-10 levels may be an immunoregulatory attempt to downregulate the diffuse inflammation that has been shown to be associated with cardiopulmonary bypass surgery.
- Published
- 1997
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