title: The subcellular localisation and the time course of bismuth in the gastric mucosa of rats after short-term administration of colloidal bismuth subcitrate.
abstract: The aim of this study was to investigate if colloidal bismuth subcitrate (CBS) can penetrate the gastric mucus barrier to reach the different sites of the antral mucosa and to estimate the time course for CBS to reach and remain in the mucosa. A single dose of CBS was administered orally to rats that were sacrificed at different time intervals post treatment. The control group received gum acacia without CBS. Colloidal bismuth subcitrate, visualised as electron dense precipitate (EDP), was seen in the gastric mucus layer, intercellular spaces and intracellularly after 30 minutes and disappeared after 6 hours. Scant amounts of EDP were observed in the gastric crypts, confined only to the upper parts of these structures. We concluded that CBS can penetrate the mucus and has a wide but uneven distribution in the gastric mucosa. Colloidal bismuth subcitrate, in the concentration given only penetrated the upper two-thirds of gastric pits and not the lower one-third. We also concluded that CBS has to be given 6 hourly to ensure its continuous presence in the gastric mucosa.
authors.affiliation: Department of Pharmacology, Faculty of Medicine, University Kebangsaan Malaysia.
authors.forename: N M
authors.initials: NM
authors.lastname: Ismail
authors.forename: M S
authors.initials: MS
authors.lastname: Mustapha
authors.forename: R
authors.initials: R
authors.lastname: Megat
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D005753:Gastric Mucosa / Q000378:metabolism*; D006170:Gum Arabic / Q000493:pharmacokinetics; D008297:Male; D008854:Microscopy, Electron; D009942:Organometallic Compounds / Q000008:administration & dosage / Q000493:pharmacokinetics*; D051381:Rats; D017208:Rats, Wistar; D013997:Time Factors
chemical_list: D000890:Anti-Infective Agents; D009942:Organometallic Compounds; D006170:Gum Arabic; C002791:bismuth tripotassium dicitrate