Abstract:
:Vascular cell adhesion molecule-1 (VCAM-1) activates endothelial cell NADPH oxidase which catalyzes production of reactive oxygen species (ROS). This activity is required for VCAM-1-dependent lymphocyte migration. The focus of our study was to determine whether these VCAM-1-dependent functions are modulated by cytokines. TGF-beta1 or IFN-gamma pretreatment of mouse endothelial cell lines inhibited VCAM-1-dependent B and T cell transendothelial migration without affecting initial lymphocyte adhesion. Neutralizing anti-TGF-beta1 blocked the effects of TGF-beta1 pretreatment of endothelial cells, whereas addition of anti-TGF-beta1 after TGF-beta1 pretreatment of the endothelial cells did not block TGF-beta1-mediated inhibition. Neutralizing anti-IFN-gamma also blocked the inhibitory effects of IFN-gamma. TGF-beta1 and IFN-gamma blocked migration by inhibiting the VCAM-1-stimulated production of low levels of ROS (0.1-0.9 microM H2O2). These results demonstrate that both TGF-beta1 and IFN-gamma directly affect the endothelial cells' ability to promote lymphocyte migration. IL-4 had differing effects on T and B cells during transmigration. IL-4 augmented T cell migration across the endothelial cell lines but did not affect T cell adhesion. Conversely, IL-4 increased B cell adhesion to the endothelial cell lines without affecting migration. In summary, cytokines can directly modulate microvascular endothelial cell intracellular signaling, demonstrating a new level of cytokine regulation of lymphocyte diapedesis.
journal_name
Cytokinejournal_title
Cytokineauthors
Tudor KS,Hess KL,Cook-Mills JMdoi
10.1006/cyto.2001.0922keywords:
subject
Has Abstractpub_date
2001-08-21 00:00:00pages
196-211issue
4eissn
1043-4666issn
1096-0023pii
S1043-4666(01)90922-6journal_volume
15pub_type
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