title: Involvement of sialic acid in transport of serotype C1 botulinum toxins through rat intestinal epithelial cells.
abstract: Clostridium botulinum produces a large toxin complex (L-TC) composed of neurotoxin (BoNT) and non-toxic proteins. In animal botulism, BoNT or L-TC is absorbed via the intestinal epithelium. To establish the cellular mechanisms of botulinum toxin absorption, we used cultured rat intestinal epithelial cells to test the binding and transport of serotype C1 BoNT and L-TC through the cell layers. BoNT and L-TC bound to and passed through the cell layers, with L-TC exhibiting larger binding and transport. Binding and transport of these toxins were inhibited by N-acetyl neuraminic acid or neuraminidase treatment of the cells. These results suggest that binding of serotype C1 BoNT and L-TC to sialic acid on the cells promoted their transport through intestinal epithelial cell layers.
authors.affiliation: Department of Food Science and Technology, Faculty of Bioindustry, Tokyo University of Agriculture, Abashiri, Hokkaido, Japan.
authors.forename: Ken
authors.initials: K
authors.lastname: Inui
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Ito
authors.forename: Keita
authors.initials: K
authors.lastname: Miyata
authors.forename: Tomohito
authors.initials: T
authors.lastname: Matsuo
authors.forename: Ryohta
authors.initials: R
authors.lastname: Horiuchi
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Ikeda
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Watanabe
authors.forename: Tohru
authors.initials: T
authors.lastname: Ohyama
authors.forename: Koichi
authors.initials: K
authors.lastname: Niwa
mesh_terms: D000818:Animals; D001665:Binding Sites; D001692:Biological Transport; D001905:Botulinum Toxins / Q000378:metabolism*; D004847:Epithelial Cells / Q000378:metabolism*; D005690:Galactose / Q000378:metabolism; D007413:Intestinal Mucosa / Q000378:metabolism; D007700:Kinetics; D007785:Lactose / Q000378:metabolism; D019158:N-Acetylneuraminic Acid / Q000378:metabolism*; D009438:Neuraminic Acids / Q000378:metabolism; D009498:Neurotoxins / Q000378:metabolism; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism; D051381:Rats
chemical_list: D009438:Neuraminic Acids; D009498:Neurotoxins; D011065:Poly(ADP-ribose) Polymerases; D001905:Botulinum Toxins; C096324:botulinum toxin type C; D019158:N-Acetylneuraminic Acid; D007785:Lactose; D005690:Galactose