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To test the hypothesis that nitric oxide ( NO ) limits endothelial activation , we treated cytokine-stimulated human saphenous vein endothelial cells with several NO donors and assessed their effects on the inducible expression of vascular cell adhesion molecule-1 ( VCAM-1 ).
 ( cell line: cytokine-stimulated human saphenous vein endothelial cells, None) , ( protein: VCAM-1, None) , ( protein: vascular cell adhesion molecule-1, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell line: cytokine-stimulated human saphenous vein endothelial cells, None) , ( protein: VCAM-1, None) , ( protein: vascular cell adhesion molecule-1, None) 