title: Lipopolysaccharide of Escherichia coli, polyamines, and acetic acid stimulate cell proliferation in intestinal epithelial cells.
abstract: Our aim was to examine whether lipopolysaccharide of Escherichia coli, polyamines of dietetic and/or bacterial origin, and products of the bacterial metabolism influence cell proliferation in epithelial cells from the colon and small intestine. Lipopolysaccharide of Escherichia coli 0111:B4 was incubated with cultures from human colonic mucosa. The mitoses were arrested with Vincristine and the total number of metaphases per crypt was counted. In addition, lipopolysaccharide was incubated with a human colonic epithelial cell line from adenocarcinoma (LS-123 cells) and with a nontransformed small intestinal cell line from germ-free rats (IEC-6 cells) for 24 h. In the last 4 h, the cells were labeled with tritiated thymidine. The cells were incubated with putrescine, cadaverine, and spermidine at 10(-11)-10(-3) M and with acetic acid (10(-5)-10(-1) M), acetaldehyde (10(-10)-10(-4) M) and ammonium chloride (1-20 mM). Lipopolysaccharide of Escherichia coli increased the number of arrested metaphases in human colonic crypts and DNA synthesis in L-123 and IEC-6 cells (P < 0.001). All polyamines increased DNA synthesis in the colonic and small intestinal cell lines, the effects being more marked for putrescine (P < 0.001). The higher concentrations of acetic acid increased DNA synthesis in both epithelial cell lines (P < 0.001). Acetaldehyde slightly decreased DNA synthesis in LS-123 cells at cytotoxic concentrations. Ammonium chloride did not significantly affect DNA synthesis. The final concentration of nonionized ammonia was less than 3%. It is concluded that lipopolysaccharides of Escherichia coli and intraluminal factors derived from microorganisms increase cell proliferation in human colonic crypts and intestinal epithelial cell lines.
authors.affiliation: Department of Medicine, Danderyd Hospital, Karolinska Institute, Stockholm, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Olaya
authors.forename: V
authors.initials: V
authors.lastname: Neopikhanov
authors.forename: A
authors.initials: A
authors.lastname: Uribe
mesh_terms: D000079:Acetaldehyde / Q000494:pharmacology; D019342:Acetic Acid / Q000494:pharmacology*; D000230:Adenocarcinoma / Q000473:pathology; D000643:Ammonium Chloride / Q000494:pharmacology; D000818:Animals; D002103:Cadaverine / Q000494:pharmacology; D002455:Cell Division / Q000187:drug effects*; D002460:Cell Line; D003110:Colonic Neoplasms / Q000473:pathology; D004247:DNA / Q000096:biosynthesis; D004926:Escherichia coli; D006801:Humans; D007413:Intestinal Mucosa / Q000166:cytology / Q000187:drug effects*; D008070:Lipopolysaccharides / Q000494:pharmacology*; D011073:Polyamines / Q000494:pharmacology*; D011700:Putrescine / Q000494:pharmacology; D051381:Rats; D013095:Spermidine / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D008070:Lipopolysaccharides; D011073:Polyamines; D000643:Ammonium Chloride; D004247:DNA; D000079:Acetaldehyde; D002103:Cadaverine; D019342:Acetic Acid; D013095:Spermidine; D011700:Putrescine