title: Proliferation of human colonic mucosa as an intermediate biomarker of carcinogenesis: effects of butyrate, deoxycholate, calcium, ammonia, and pH.
abstract: A high-fat/high-protein diet has been reported to promote colon cancer by increasing luminal bile acid and ammonia concentrations, whereas butyrate, calcium, and low colonic pH may have protective effects. In this study, bromodeoxyuridine labeling of colonic epithelium was investigated after incubating biopsies from the ascending colon of 70 patients with HCl (20 mM, pH 6.0), butyric acid (H-BUT, 20 mM, pH 6.0), sodium butyrate (Na-BUT, 10 mM, pH 8.0), CaCl2 (10 mM), calcium butyrate (Ca-BUT, 10 mM), ammonium butyrate (NH4-BUT, 10 mM), deoxycholic acid (DCA, 5 microM), and a combination of DCA and Na-BUT (DCA/Na-BUT, 5 microM/10 mM). Compared to NaCl, H-BUT and Na-BUT increased the whole crypt-labeling index significantly, whereas HCl and CaCl2 had no effect. Reduced labeling, however, occurred with Ca-BUT in comparison to equimolar Na-BUT. No differences in the labeling indexes were found for NH4-BUT compared to Na-BUT, but increased labeling with expansion of the proliferative zone to the upper 40% of the crypt was seen with DCA compared to NaCl. DCA-induced hyperproliferation was abolished by coincubation with DCA/Na-BUT. These data suggest that butyrate, calcium, and DCA have complex influences on mucosal proliferation. Since luminal concentrations of these compounds are influenced by dietary interventions, the findings of this study may be of particular interest with regard to colon cancer development and prevention.
authors.affiliation: Department of Medicine, University of Wuerzburg, Germany.
authors.forename: H P
authors.initials: HP
authors.lastname: Bartram
authors.forename: W
authors.initials: W
authors.lastname: Scheppach
authors.forename: H
authors.initials: H
authors.lastname: Schmid
authors.forename: A
authors.initials: A
authors.lastname: Hofmann
authors.forename: G
authors.initials: G
authors.lastname: Dusel
authors.forename: F
authors.initials: F
authors.lastname: Richter
authors.forename: A
authors.initials: A
authors.lastname: Richter
authors.forename: H
authors.initials: H
authors.lastname: Kasper
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000641:Ammonia / Q000494:pharmacology*; D002087:Butyrates / Q000494:pharmacology*; D020148:Butyric Acid; D002118:Calcium / Q000494:pharmacology*; D002122:Calcium Chloride / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D003110:Colonic Neoplasms / Q000209:etiology* / Q000473:pathology; D003840:Deoxycholic Acid / Q000494:pharmacology*; D005260:Female; D006801:Humans; D006851:Hydrochloric Acid / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D007413:Intestinal Mucosa / Q000187:drug effects / Q000473:pathology*; D008297:Male; D008875:Middle Aged
chemical_list: D002087:Butyrates; D003840:Deoxycholic Acid; D020148:Butyric Acid; D000641:Ammonia; D002122:Calcium Chloride; D006851:Hydrochloric Acid; D002118:Calcium