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Role of the ceramid...
Role of the ceramide signalling pathway in cytokine responses to P fimbriated Escherichia coli.
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- Hedlund, Maria (author)
- Lund University,Lunds universitet,Avdelningen för mikrobiologi, immunologi och glykobiologi - MIG,Institutionen för laboratoriemedicin,Medicinska fakulteten,Division of Microbiology, Immunology and Glycobiology - MIG,Department of Laboratory Medicine,Faculty of Medicine
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- Svensson, Majlis (author)
- Lund University,Lunds universitet,Avdelningen för mikrobiologi, immunologi och glykobiologi - MIG,Institutionen för laboratoriemedicin,Medicinska fakulteten,Division of Microbiology, Immunology and Glycobiology - MIG,Department of Laboratory Medicine,Faculty of Medicine
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- Nilsson, Åke (author)
- Lund University,Lunds universitet,Medicin, Lund,Sektion II,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Gastro,Forskargrupper vid Lunds universitet,Medicine, Lund,Section II,Department of Clinical Sciences, Lund,Faculty of Medicine,Lund University Research Groups
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- Duan, Rui-Dong (author)
- Lund University,Lunds universitet,Medicin, Lund,Sektion II,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Gastro,Forskargrupper vid Lunds universitet,Medicine, Lund,Section II,Department of Clinical Sciences, Lund,Faculty of Medicine,Lund University Research Groups
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- Svanborg, Catharina (author)
- Lund University,Lunds universitet,Avdelningen för mikrobiologi, immunologi och glykobiologi - MIG,Institutionen för laboratoriemedicin,Medicinska fakulteten,Cancerinfektion,Forskargrupper vid Lunds universitet,Division of Microbiology, Immunology and Glycobiology - MIG,Department of Laboratory Medicine,Faculty of Medicine,Cancer Infection,Lund University Research Groups
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(creator_code:org_t)
- 1996-03-01
- 1996
- English.
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In: Journal of Experimental Medicine. - : Rockefeller University Press. - 1540-9538 .- 0022-1007. ; 183:3, s. 1037-1044
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Abstract
Subject headings
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- Escherichia coli express fimbriae-associated adhesins through which they attach to mucosal cells and activate a cytokine response. The receptors for E. coli P fimbriae are the globoseries of glycosphingolipids; Gal alpha 1-->4Gal beta-containing oligosaccharides bound to ceramide in the outer leaflet of the lipid bilayer. The receptors for type 1 fimbriae are mannosylated glycoproteins rather than glycolipids. This study tested the hypothesis that P-fimbriated E. coli elicit a cytokine response through the release of ceramide in the receptor-bearing cell. We used the A498 human kidney cell line, which expressed functional receptors for P and type 1 fimbriae and secreted higher levels of interleukin (IL)-6 when exposed to the fimbriated strains than to isogenic nonfimbriated controls. P-fimbriated E. coli caused the release of ceramide and increased the phosphorylation of ceramide to ceramide 1-phosphate. The IL-6 response to P-fimbriated E. coli was reduced by inhibitors of serine/threonine kinases but not by other protein kinase inhibitors. In contrast, ceramide levels were not influenced by type 1-fimbriated E. coli, and the IL-6 response was insensitive to the serine/threonine kinase inhibitors. These results demonstrate that the ceramide-signaling pathway is activated by P-fimbriated E. coli, and that the receptor specificity of the P fimbriae influences this process. We propose that this activation pathway contributes to the cytokine induction by P-fimbriated E. coli in epithelial cells.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Cell- och molekylärbiologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Cell and Molecular Biology (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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