TNF-alpha and IL-1 upregulate membrane-bound and soluble E-selectin through a common pathway

The Journal of Surgical Research
C W WybleB L Gewertz

Abstract

Endothelial cell adhesion molecules such as E-selectin promote the capture of neutrophils (PMN) in the microcirculation and initiate the inflammatory response. In contrast, when "shed" into the microcirculation, soluble E-selectin can bind PMN in the blood stream, reducing the number available for adhesion to injured tissue. These experiments were designed to better characterize the molecular response to cytokines and the balance between cell surface (bound) and soluble (unbound) E-selectin. Cultured human umbilical veins, exposed to human recombinant TNF-alpha or IL-1 (10 pg/ml), were analyzed for E-selectin mRNA induction (Northern blot), E-selectin cell surface expression (flow cytometry), and sE-selectin release (ELISA). Transcriptional regulation was analyzed via Raf kinase dominant negative gene transfection. E-selectin mRNA expression was markedly increased at 2 h and sustained through 8 h. No further induction was noted at 12 h. Upregulation of cell surface E-selectin was noted (mean fluorescence) as early as 2 h for TNF-alpha (baseline, 12.28 +/- 1.32; TNF-alpha, 23.03 +/- 1.81) or 4 h for IL-1 (baseline, 12.28 +/- 1.32; IL-1, 70.00 +/- 3.04) with maximum expression at 6 h (TNF-alpha, 118.8+/-15; IL-1, 94.11 +/- 9. 34)...Continue Reading

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