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1 Departments of Molecular and Cellular Physiology and Medicine, Louisiana State University Health Sciences Center, Shreveport, Louisiana 71130-3932; and 2 Department of Pediatrics, University of California, San Francisco, California 94143-0748
Monolayers of
cultured endothelial cells exposed to hypoxia-reoxygenation exhibit a
transcription-dependent increase in E-selectin expression and
E-selectin-dependent neutrophil-endothelial cell adhesion. The overall
objectives of this study were 1) to determine whether
ischemia-reperfusion (I/R) promotes upregulation of E-selectin in vivo; 2) if so, to define the mediators of this response;
and 3) to assess the contribution of E-selectin to I/R-induced
neutrophil recruitment. The dual-radiolabeled monoclonal antibody (MAb)
technique was used to measure E-selectin expression in the intestinal
vasculature. Ischemia was induced by complete occlusion
(30-60 min) of the superior mesenteric artery followed by
3-24 h of reperfusion. Increasing durations of ischemia
elicited progressively increasing (2- to 5-fold) levels of E-selectin
expression, with the peak response noted after 45 min of
ischemia and 5 h of reperfusion. Subsequent experiments
revealed that I/R-induced increase in E-selectin expression (at 5 h) is
significantly blunted in transgenic mice that overexpress
Cu,Zn-superoxide dismutase or by treatment of wild-type mice with
either a blocking antibody against tumor necrosis factor (TNF)-
or
an inhibitor of nuclear factor-
B (NF-
B) activation (PS341).
Administration of an E-selectin-specific MAb dramatically reduced
I/R-induced recruitment of neutrophils in the intestine. These findings
suggest that superoxide and TNF-
mediate gut I/R-induced E-selectin
expression via an NF-
B-dependent mechanism; this upregulation of
E-selectin contributes significantly to I/R-induced neutrophil recruitment.
superoxide dismutase; tumor necrosis factor; neutrophils; nuclear factor-kappaB; interferon-gamma
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