AIM： To investigate intestinal alkaline phosphatase （iAP） in the intestinal mucosa of children with inflammatory bowel disease （IBD）. METHODS： Colonic biopsy samples were taken from 15 newly diagnosed IBD patien...AIM： To investigate intestinal alkaline phosphatase （iAP） in the intestinal mucosa of children with inflammatory bowel disease （IBD）. METHODS： Colonic biopsy samples were taken from 15 newly diagnosed IBD patients and from 10 healthy controls. In IBD patients, specimens were obtainedboth from inflamed and non-inflamed areas. The lAP mRNA and protein expression was determined by reverse transcription-polymerase chain reaction and Western blotting analysis, respectively. Tissue localiza- tion of lAP and Toll-like receptor （TLR） 4 was investi- gated by immunofluorescent staining. RESULTS： The lAP protein level in the inflamed muco- sa of children with Crohn＇s disease （CD） and ulcerative colitis （UC） was significantly decreased when compared with controls （both P 〈 0.05）. Similarly, we found a significantly decreased level of lAP protein in the in- flamed mucosa in CD compared with non-inflamed mucosa in CD （P 〈 0.05）. In addition, the iAP protein level in inflamed colonic mucosa in patients with UC was decreased compared with non-inflamed mucosa in patients with CD （P 〈 0.05）. lAP protein levels in the non-inflamed mucosa of patients with CD were similar to controls, lAP mRNA expression in inflamed colonic mucosa of children with CD and UC was not significant- ly different from that in non-inflamed colonic mucosa with CD. Expression of lAP mRNA in patients with non- inflamed mucosa and in controls were similar. Co-local- ization of lAP with TLR4 showed intense staining with a dotted-like pattern, lAP was present in the inflamed and non-inflamed mucosa of patients with CD, UC, and in control biopsy specimens, irrespective of whether it was present in the terminal ileum or in the colon. However, the fluorescent signal of TLR4 was more pro- nounced in the colon compared with the terminal ileum in all groups studied. CONCLUSION： Lower than normal lAP protein levels in inflamed mucosa of IBD patients may indicate a role for lAP in inflammatory lesions in IBD. Based on our results, administration of exogenous lAP enzyme to pa- tients with the active form of IBD may be a therapeutic option.展开更多
基金Supported by Grants OTKA-76316,OTKA-K81117,and ETT-028-02 (Veres G and Vannay á are holders of the János Bolyai Research grant)János Bolyai Research Scholarship of the Hungarian Academy of Sciences
文摘AIM： To investigate intestinal alkaline phosphatase （iAP） in the intestinal mucosa of children with inflammatory bowel disease （IBD）. METHODS： Colonic biopsy samples were taken from 15 newly diagnosed IBD patients and from 10 healthy controls. In IBD patients, specimens were obtainedboth from inflamed and non-inflamed areas. The lAP mRNA and protein expression was determined by reverse transcription-polymerase chain reaction and Western blotting analysis, respectively. Tissue localiza- tion of lAP and Toll-like receptor （TLR） 4 was investi- gated by immunofluorescent staining. RESULTS： The lAP protein level in the inflamed muco- sa of children with Crohn＇s disease （CD） and ulcerative colitis （UC） was significantly decreased when compared with controls （both P 〈 0.05）. Similarly, we found a significantly decreased level of lAP protein in the in- flamed mucosa in CD compared with non-inflamed mucosa in CD （P 〈 0.05）. In addition, the iAP protein level in inflamed colonic mucosa in patients with UC was decreased compared with non-inflamed mucosa in patients with CD （P 〈 0.05）. lAP protein levels in the non-inflamed mucosa of patients with CD were similar to controls, lAP mRNA expression in inflamed colonic mucosa of children with CD and UC was not significant- ly different from that in non-inflamed colonic mucosa with CD. Expression of lAP mRNA in patients with non- inflamed mucosa and in controls were similar. Co-local- ization of lAP with TLR4 showed intense staining with a dotted-like pattern, lAP was present in the inflamed and non-inflamed mucosa of patients with CD, UC, and in control biopsy specimens, irrespective of whether it was present in the terminal ileum or in the colon. However, the fluorescent signal of TLR4 was more pro- nounced in the colon compared with the terminal ileum in all groups studied. CONCLUSION： Lower than normal lAP protein levels in inflamed mucosa of IBD patients may indicate a role for lAP in inflammatory lesions in IBD. Based on our results, administration of exogenous lAP enzyme to pa- tients with the active form of IBD may be a therapeutic option.
