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The Journal of Immunology, Vol 156, Issue 5 1886-1896, Copyright © 1996 by American Association of Immunologists
ARTICLES |
L Schofield, S Novakovic, P Gerold, RT Schwarz, MJ McConville and SD Tachado
Immunoparasitology Unit, Royal Melbourne Hospital, Victoria, Australia.
In this study we demonstrate that glycosylphosphatidylinositol (GPI) of malaria parasite origin directly increases cell adhesion molecule expression in purified HUVECs in a dose- and time-dependent manner, resulting in a marked increase in parasite and leukocyte cytoadherence to these target cells. The structurally related glycolipids dipalmitoyl- phosphatidylinositol and iM4 glycoinositolphospholipid of Leishmania mexicana had no such activity. Malarial GPI exerts this effect by activation of an endogenous GPI-based signal transduction pathway in endothelial cells. GPI induces rapid onset tyrosine phosphorylation of multiple intracellular substrates within 1 min of addition to cells in a dose-dependent manner. This activity can be blocked by the protein tyrosine kinase-specific antagonist herbimycin A, genistein, and tyrphostin. These tyrosine kinase antagonists also inhibit GPI-mediated up-regulation of adhesion expression and parasite cytoadherence. GPI- induced up-regulation of adhesion expression and parasite cytoadherence can also be blocked by the NF kappa B/c-rel antagonist pyrrolidine- dithiocarbamate, suggesting the involvement of this family of transcription factors in GPI-induced adhesin expression. The direct activation of endothelial cells by GPI does not require the participation of TNF or IL-1. However, GPI is also responsible for the indirect pathway of increased adhesin expression mediated by TNF and IL- 1 output from monocytes/macrophages. Total parasite extracts also up- regulate adhesin expression and parasite cytoadherence in HUVECs, and this activity is blocked by a neutralizing mAb to malaria GPI, suggesting that GPI is the dominant agent of parasite origin responsible for this activity. Thus, a parasite-derived GPI toxin activates vascular endothelial cells by tyrosine kinase-mediated signal transduction, leading to NF kappa B/c-rel activation and downstream expression of adhesins, events that may play a central role in the etiology of cerebral malaria.
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