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- W2281054428 abstract "Increased nitric oxide (NO) production by inducible nitric oxide synthase (iNOS) has been associated with intestinal inflammation, including human inflammatory bowel disease. However, NO can downregulate endothelial activation and leukocyte adhesion, critical steps in the inflammatory response. Using primary cultures of human intestinal microvascular endothelial cells (HIMEC), we determined the role of NO in the regulation of HIMEC activation and interaction with leukocytes. Both nonselective ( N G -monomethyl-l-arginine) and specific ( N-iminoethyl-l-lysine) competitive inhibitors of iNOS significantly increased binding of leukocytes by HIMEC activated with cytokines and lipopolysaccharide. Increased adhesion was reversible with the NOS substratel-arginine and was not observed in human umbilical vein endothelial cells (HUVEC). Activation of HIMEC significantly upregulated HIMEC iNOS expression and NO production. NOS inhibitors did not augment cell adhesion molecule levels in activated HIMEC but did result in sustained increases in intracellular reactive oxygen species. In addition, antioxidant compounds reversed the effect of NOS inhibitors on HIMEC-leukocyte interaction. Taken together, these data suggest that after HIMEC activation, iNOS-derived NO is an endogenous antioxidant, downregulating leukocyte binding and potentially downregulating intestinal inflammation." @default.
- W2281054428 created "2016-06-24" @default.
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- W2281054428 date "1998-09-01" @default.
- W2281054428 modified "2023-10-03" @default.
- W2281054428 title "iNOS expression in human intestinal microvascular endothelial cells inhibits leukocyte adhesion" @default.
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- W2281054428 doi "https://doi.org/10.1152/ajpgi.1998.275.3.g592" @default.
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