Regulated production of the chemokine CCL28 in human colon epithelium
| Autor: | Mitsutoshi Iimura, Hiroyuki Ogawa, Martin F. Kagnoff, Lars Eckmann |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Adult
Chemokine Colon Physiology Transplantation Heterologous Mice SCID Cell Line Mice Fetus Physiology (medical) medicine Animals Humans Intestinal Mucosa Hepatology biology Gastroenterology Interleukin Chemotaxis Colitis Epithelium Cell biology Mice Inbred C57BL Transplantation Butyrates medicine.anatomical_structure Cell culture Chemokines CC Immunology biology.protein CCL28 Chemokines Homeostasis Flagellin Interleukin-1 |
| Zdroj: | American Journal of Physiology-Gastrointestinal and Liver Physiology. 287:G1062-G1069 |
| ISSN: | 1522-1547 0193-1857 |
| DOI: | 10.1152/ajpgi.00162.2004 |
| Popis: | The chemokine CCL28 is constitutively expressed by epithelial cells at several mucosal sites and is thought to function as a homeostatic chemoattractant of subpopulations of T cells and IgA B cells and to mediate antimicrobial activity. We report herein on the regulation of CCL28 in human colon epithelium by the proinflammatory cytokine IL-1, bacterial flagellin, and n-butyrate, a product of microbial metabolism. In vivo, CCL28 was markedly increased in the epithelium of pathologically inflamed compared with normal human colon. Human colon and small intestinal xenografts were used to model human intestinal epithelium in vivo. Xenografts constitutively expressed little, if any, CCL28 mRNA or protein. After stimulation with the proinflammatory cytokine IL-1, CCL28 mRNA and protein were significantly increased in the epithelium of colon but not small intestinal xenografts, although both upregulated the expression of another prototypic chemokine, CXCL8, in response to the identical stimulus. In studies of CCL28 regulation using human colon epithelial cell lines, proinflammatory stimuli, including IL-1, bacterial flagellin, and bacterial infection, significantly upregulated CCL28 mRNA expression and protein production. In addition, CCL28 mRNA expression and protein secretion by those cells were significantly increased by the short-chain fatty acid n-butyrate, and IL-1- or flagellin-stimulated upregulation of CCL28 by colon epithelial cells was synergistically increased by pretreatment of cells with n-butyrate. Consistent with its upregulated expression by proinflammatory stimuli, CCL28 mRNA expression was attenuated by pharmacological inhibitors of NF-κB activation. These findings indicate that CCL28 functions as an “inflammatory” chemokine in human colon epithelium and suggest the notion that CCL28 may act to counterregulate colonic inflammation. |
| Databáze: | OpenAIRE |
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