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Regular Article |
Plus Interferon-
Does Not Reduce Leukocyte Transmigration Under Flow




From the Department of Pathology,*
Vascular Research
Division, Brigham and Womens Hospital and Harvard Medical School,
Boston, Massachusetts; and the Department of Laboratory Medicine and
Pathology,
Division of Gastrointestinal
Pathology, Emory University, Atlanta, Georgia
The combination of tumor necrosis factor (TNF)-
plus interferon
(IFN)-
has been shown previously to promote redistribution of
platelet/endothelial cell adhesion molecule-1 (PECAM-1) (CD31),
junctional adhesion molecule (JAM), and VE-cadherin away from
lateral junctions of human umbilical vein endothelial cell monolayers.
In parallel, neutrophil transmigration was significantly
reduced. Because PECAM-1 and JAM have been implicated in leukocyte
transmigration, the observed redistribution by cytokine
activation was presumed to represent the mechanism causing decreased
transmigration under static conditions. The current results confirm
that culture of human umbilical vein endothelial cells with TNF-
plus IFN-
caused a decrease in surface-expressed and
junctional-localized JAM and PECAM-1, but did not cause
decreased leukocyte transmigration in an in vitro flow
assay. Furthermore, blocking monoclonal antibody to PECAM-1
still significantly reduced monocyte transmigration,
demonstrating that it retains a functional role even though its levels
were reduced and redistributed away from junctions, whereas a
panel of monoclonal antibodies to JAM failed to reduce leukocyte
transmigration. Given the alterations in junction protein
location, permeability function was assessed. IFN-
alone or
TNF-
plus IFN-
significantly increased permeability, but
TNF-
alone did not, suggesting lack of correlation between
transmigration and loss of permeability. In conclusion,
cytokine activation induced loss and redistribution of PECAM-1 and JAM
away from lateral junctions, but per se does not negatively
regulate either neutrophil or monocyte transmigration under
flow.
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