Cellular Biology |
From the Department of Molecular and Cellular Physiology (S.K., D.N.G., T.Y.A.) and the Center of Excellence in Arthritis and Rheumatism (R.E.W.), Louisiana State University Medical Center, Shreveport, and the First Department of Internal Medicine (T.Y.), Kyoto Prefectural University of Medicine, Kyoto, Japan.
Correspondence to Tak Yee Aw, PhD, Department of Molecular and Cellular Physiology, LSU Medical Center, 1501 Kings Highway, Shreveport, LA 71130-3932. E-mail taw{at}lsumc.edu
AbstractThe overall objective of
this study was to determine whether T lymphocytes can modulate the
increased neutrophil adherence and upregulation of
endothelial cell adhesion molecules in human umbilical
vein endothelial cells (HUVECs) exposed to
anoxia/reoxygenation (A/R). HUVEC monolayers were
exposed to 60 minutes of anoxia, followed by 4 hours of
reoxygenation in the absence or presence of human T
lymphocytes. The A/R-induced neutrophil adhesion was significantly
enhanced when T lymphocytes and HUVECs were cocultured for the first 45
minutes of reoxygenation. This was accompanied by a
more pronounced increase in E-selectin expression. When T lymphocytes
were cocultured with HUVECs by use of inserts that prevented direct
cell-cell contact, a comparable A/R-induced enhancement of neutrophil
adhesion and of E-selectin expression was observed, indicating that
soluble factors produced by T lymphocytes mediate the exaggerated
A/R-induced inflammatory responses. Treatment with either an
antitumor necrosis factor-
antibody or catalase attenuated the
T-cellmediated responses in postanoxic HUVECs. Moreover, the
T-cellmediated neutrophil adhesion response was mimicked by exposure
of naive HUVECs to H2O2. These findings
indicate that H2O2 produced by postanoxic
endothelial cells stimulates T cells to produce tumor
necrosis factor-
, which in turn elicits endothelial
cell adhesion molecule expression and a corresponding increase in
neutrophil adhesion.
Key Words: tumor necrosis factor-
hydrogen peroxide E-selectin T lymphocyte neutrophil
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