Endothelial cell activation by pore-forming structures: pivotal role for interleukin-1alpha.

Abstract:

BACKGROUND:Interaction of complement with endothelial cells (ECs) underlies the development of inflammation and coagulation in disease. Assembly of the membrane attack complex (MAC) of complement on EC membrane, like stimulation with cytokines, upregulates tissue factor and cyclooxygenase-2 but does so via the intermediary action of IL-1alpha. We asked whether the MAC activates porcine aortic and microvascular ECs in a global manner by this mechanism and whether this mechanism is used by membrane pore-forming structures. METHODS AND RESULTS:Exposure of ECs to complement caused upregulation of mRNAs for E-selectin, intracellular adhesion molecule-1, vascular cell adhesion molecule-1, Ikappa-Balpha, interleukin (IL)-1alpha, IL-1beta, IL-8, and plasminogen activator inhibitor-1 over a period of 6 hours. The expression of these genes was not a primary response to stimulation, however, because IL-1 receptor antagonist inhibited expression of these genes. Activation of ECs by complement depended on the autocrine action of IL-1alpha, because complement-mediated EC activation was inhibited by anti-IL-1alpha antibodies. Melittin and mastoparan, amphiphilic pore-forming peptides like the MAC, induced E-selectin through intermediary action of IL-1. CONCLUSIONS:These findings suggest that transmembrane pore-forming proteins, as a class of molecules, activate ECs through the autocrine effects of IL-1alpha.

journal_name

Circulation

journal_title

Circulation

authors

Saadi S,Holzknecht RA,Patte CP,Platt JL

doi

10.1161/01.cir.101.15.1867

subject

Has Abstract

pub_date

2000-04-18 00:00:00

pages

1867-73

issue

15

eissn

0009-7322

issn

1524-4539

journal_volume

101

pub_type

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