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receptors to murine
intimal hyperplasia
Divisions of 1 Cardiothoracic Surgery and 2 Infectious Disease, University of Colorado Health Sciences Center, Denver, Colorado 80262
Tumor necrosis factor-
(TNF-
) is
an important mediator in the inflammatory response to vascular injury.
The present study sought to determine the relative contribution of each
TNF-
receptor subtype (p55 and p75) to intimal hyperplasia (IH) and
characterize the mechanisms of transcriptional regulation after
vascular injury. A murine model of wire carotid arterial injury was
employed to induce IH in wild-type (WT), p55-deficient (p55
/
), and
p75-deficient (p75
/
) mice. Compared with injured WT and p75
/
animals, p55
/
mice demonstrated a twofold reduction in IH.
Additionally, p55
/
mice demonstrated a decrease in expression of
nuclear factor-
B mRNA and protein. These observations suggest an
important role for the p55 receptor in IH after mechanical endoluminal
injury. Suppression of the transcriptional activator nuclear
factor-
B may provide a mechanism by which p55-mediated IH is attenuated.
vasculature; restenosis; carotid arteries
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