Intestinal alkaline phosphatase contributes to the reduction of severe intestinal epithelial damage

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• 作者：Marianne Bol-Schoenmakers ; Danië ; lle Fiechter ; Willem Raaben ; Ine Hassing ; Rob Bleumink ; Danië ; lle Kruijswijk ; Kelly Maijoor ; Monique Tersteeg-Zijderveld ; Ruud Br ; s ; Raymond Pieters
• 关键词：Inflammatory bowel disease ; Alkaline phosphatase ; Lipopolysaccharide ; Dextran sulfate sodium ; m ICc12 cell line
• 刊名：European Journal of Pharmacology
• 出版年：2010
• 出版时间：10 May 2010
• 年：2010
• 卷：633
• 期：1-3
• 页码：71-77
• 全文大小：695 K

文摘

Inflammatory bowel disease is characterized by chronic inflammation of the intestine and is accompanied by damage of the epithelial lining and by undesired immune responses towards enteric bacteria. It has been demonstrated that intestinal alkaline phosphatase (iAP) protects against the induction of inflammation, possibly due to dephosphorylation of lipopolysaccharide (LPS). The present study investigated the therapeutic potential of iAP in intestinal inflammation and epithelial damage. Intestinal epithelial damage was induced in C57BL/6 mice using detran sulfate sodium (DSS) and iAP was administered 4 days after initial DSS exposure. Loss in body weight was significantly less in iAP-treated mice and accompanied with reduced colon damage (determined by combination of crypt loss, loss of goblet cells, oedema and infiltrations of neutrophils). Treatment with iAP was more effective in case of severe inflammation compared to situations of mild to moderate inflammation. Rectal administration of LPS into a moderate inflamed colon did not aggravate inflammation. Furthermore, soluble iAP did not lower LPS-induced nuclear factor-κB activation in epithelial cells in vitro but induction of cellular AP expression by butyrate resulted in decreased LPS response. In conclusion, the present study shows that oral iAP administration has beneficial effects in situations of severe intestinal epithelial damage, whereas in moderate inflammation endogenous iAP may be sufficient to counteract disease-aggravating effects of LPS. An approach including iAP treatment holds a therapeutic promise in case of severe inflammatory bowel disease.