Linked Life Data

8589921

Source:http://linkedlifedata.com/resource/pubmed/id/8589921

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1996-3-27
pubmed:abstractText
Prostaglandins have been shown to be involved in the suppression of contact hypersensitivity (CHS) by so-far ill understood mechanisms. T-cell migration across the lining of cytokine-activated endothelial cells (EC) is thought to be a central step in the initiation of CHS. The aim of our investigation was therefore to examine whether prostaglandin E1 (PGE1) influences cytokine-induced TK-1 mouse T-cell lymphoma adhesion to eEnd.2 mouse endothelioma cells. Here, we report that PGE1 (10(-12)-10(-8) M) dose-dependently reduced TNF alpha-induced T-cell binding, while TNF alpha-unstimulated adhesion was not affected. To test whether PGE1 acted primarily on T-cells or on EC, they were separately pretreated with PGE1 prior to the adhesion assay. Selective PGE1 pretreatment of eEnd.2, but not of TK-1 dose-dependently inhibited TNF alpha, stimulated T-cell adhesion. Since binding of TK-1 to TNF alpha-treated eEnd.2 is mediated by the interaction of ICAM-1 and VCAM-1 (on EC) with their receptors LFA-1 and VLA-4 (on T-cells), we further investigated whether PGE1 would modulate the expression of these molecules. FACS-analysis revealed PGE1 to inhibit TNF alpha-induced upregulation of ICAM-1, but not of VCAM-1 on EC. Furthermore, constitutive LFA-1 and VLA-4 expression on T-cells was not affected by PGE1. We conclude that PGE1 supresses T-cell adhesion to EC by selectively inhibiting TNF alpha-induced upregulation of ICAM-1 on EC. This may be one mechanism by which prostaglandins suppress immune responses requiring T-cell EC interactions such as contact hypersensitivity in skin.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0906-6705
pubmed:author
pubmed:issnType
Print
pubmed:volume
4
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
302-7
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Prostaglandin E1 inhibits TNF alpha-induced T-cell adhesion to endothelial cells by selective down-modulation of ICAM-1 expression on endothelial cells.
pubmed:affiliation
Department of Dermatology, University of Freiburg, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't