Abstract:
BACKGROUND:Zinc carnosine (ZnC) is a health food product claimed to possess health-promoting and gastrointestinal supportive activity. Scientific evidence underlying these claims is, however, limited. AIM:To examine the effect of ZnC on various models of gut injury and repair, and in a clinical trial. METHODS:In vitro studies used pro-migratory (wounded monolayer) and proliferation ([(3)H]-thymidine incorporation) assays of human colonic (HT29), rat intestinal epithelial (RIE) and canine kidney (MDCK) epithelial cells. In vivo studies used a rat model of gastric damage (indomethacin/restraint) and a mouse model of small-intestinal (indomethacin) damage. Healthy volunteers (n = 10) undertook a randomised crossover trial comparing changes in gut permeability (lactulose:rhamnose ratios) before and after 5 days of indomethacin treatment (50 mg three times a day) with ZnC (37.5 mg twice daily) or placebo coadministration. RESULTS:ZnC stimulated migration and proliferation of cells in a dose-dependent manner (maximum effects in both assays at 100 micromol/l using HT29 cells), causing an approximate threefold increase in migration and proliferation (both p<0.01). Oral ZnC decreased gastric (75% reduction at 5 mg/ml) and small-intestinal injury (50% reduction in villus shortening at 40 mg/ml; both p<0.01). In volunteers, indomethacin caused a threefold increase in gut permeability in the control arm; lactulose:rhamnose ratios were (mean (standard error of mean)) 0.35 (0.035) before indomethacin treatment and 0.88 (0.11) after 5 days of indomethacin treatment (p<0.01), whereas no significant increase in permeability was seen when ZnC was coadministered. CONCLUSION:ZnC, at concentrations likely to be found in the gut lumen, stabilises gut mucosa. Further studies are warranted.
journal_name
Gutjournal_title
Gutauthors
Mahmood A,FitzGerald AJ,Marchbank T,Ntatsaki E,Murray D,Ghosh S,Playford RJdoi
10.1136/gut.2006.099929subject
Has Abstractpub_date
2007-02-01 00:00:00pages
168-75issue
2eissn
0017-5749issn
1468-3288pii
gut.2006.099929journal_volume
56pub_type
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