IL-18-binding protein expression by endothelial cells and macrophages is up-regulated during active Crohn's disease.

Abstract

The pathogenesis of Crohn's disease (CD) remains under intense investigation. Increasing evidence suggests a role for mature IL-18 in the induction of proinflammatory cytokines and Th1 polarization in CD lesions. The aim of this study was to investigate the contribution of the IL-18-neutralizing (a and c) and non-neutralizing (b and d) isoforms of IL-18-binding protein (IL-18BP) during active CD. Intestinal endothelial cells and macrophages were the major source of IL-18BP within the submucosa, and this IL-18BP production was also found to be relevant to other types of endothelial cells (HUVEC) and macrophages (peripheral monocytes). IL-18BP messenger transcript and protein were significantly increased in surgically resected specimens from active CD compared with control patients, correlating with an up-regulation of IL-18. Analysis of the expression of the four IL-18BP isoforms as well as being free or bound to IL-18 was reported and revealed that unbound IL-18BP isoforms a and c and inactive isoform d were present in specimens from active CD and control patients while isoform b was not detected. IL-18/IL-18BP complex was also detected. Interestingly, although most was complexed, free mature IL-18 could still be detected in active CD specimens even in the presence of the IL-18BP isoform a/c. These results demonstrate that the appropriate neutralizing isoforms are present in the intestinal tissue of patients with active CD and highlights the complexity of IL-18/IL-18BP biology.

• Authors: Anne Corbaz, Tessa ten Hove, Suzanne Herren, Pierre Graber, Boris Schwartsburd, Ilana Belzer, Jillian Harrison, Thomas Plitz, Marie H Kosco-Vilbois, Soo-Hyun Kim, Charles A Dinarello, Daniela Novick, Sander van Deventer, Yolande Chvatchko
• Journal: Journal of immunology (Baltimore, Md. : 1950) (J Immunol) Vol. 168 Issue 7 Pg. 3608-16 (Apr 01 2002) ISSN: 0022-1767 [Print] United States
• PMID: 11907126 (Publication Type: Journal Article, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Glycoproteins
• Intercellular Signaling Peptides and Proteins
• Interleukin-18
• interleukin-18 binding protein

Topics

• Adult
• Aged
• Aged, 80 and over
• Cells, Cultured
• Colon (immunology, metabolism, pathology)
• Crohn Disease (immunology, metabolism, pathology)
• Endothelium, Vascular (cytology, immunology, metabolism)
• Female
• Glycoproteins (biosynthesis, blood, metabolism)
• Humans
• Ileum (immunology, metabolism, pathology)
• Immunohistochemistry
• Intercellular Signaling Peptides and Proteins
• Interleukin-18 (antagonists & inhibitors, biosynthesis, metabolism)
• Intestinal Mucosa (immunology, metabolism, pathology)
• Macrophages (cytology, immunology, metabolism)
• Male
• Middle Aged
• Umbilical Veins
• Up-Regulation (immunology)