title: Adherence of Acinetobacter baumannii to rat bladder tissue.
abstract: Acinetobacter baumannii, an important nosocomial pathogen, causes severe infections in patients of intensive care units, but its pathogenic attributes are unknown. Previously, the adherence of A. baumannii to cell lines has been negative in the authors' laboratory. In this work, the adherence of strains of A. baumannii of various biotypes to small pieces of rat bladder tissue was investigated. Tissue pieces were submerged into cultures of A. baumannii and sessile cells were counted after removing planktonic bacteria. Fimbriae and sessile cells were examined by transmission and scanning electron microscopy, respectively. In contrast to a uropathogenic strain of Escherichia coli, all cultures exhibited a mannose- and galactose-resistant agglutination of human group O red blood cells as well as mannose- and galactose-resistant adherence to the bladder tissue. Inhibition of exopolysaccharide synthesis did not modify adherence. Indeed, adherence, apparently unrelated to these fimbriae or to the exopolysaccharide, may be a factor contributing to the pathogenicity of A. baumannii in the urinary tract or in other tissues.
authors.affiliation: Departamento de Microbiologia, Facultad de Ciencias Biologicas, Universidad de Concepcion, Casilla, Chile.
authors.forename: M
authors.initials: M
authors.lastname: Sepulveda
authors.forename: M
authors.initials: M
authors.lastname: Ruiz
authors.forename: H
authors.initials: H
authors.lastname: Bello
authors.forename: M
authors.initials: M
authors.lastname: Dominguez
authors.forename: M A
authors.initials: MA
authors.lastname: Martínez
authors.forename: M E
authors.initials: ME
authors.lastname: Pinto
authors.forename: G
authors.initials: G
authors.lastname: Gonzalez
authors.forename: S
authors.initials: S
authors.lastname: Mella
authors.forename: R
authors.initials: R
authors.lastname: Zemelman
mesh_terms: D000150:Acinetobacter / Q000502:physiology*; D000818:Animals; D001422:Bacterial Adhesion / Q000187:drug effects; D001729:Bismuth; D002478:Cells, Cultured; D004926:Escherichia coli / Q000502:physiology; D005690:Galactose / Q000494:pharmacology; D006801:Humans; D008358:Mannose / Q000494:pharmacology; D008854:Microscopy, Electron; D009942:Organometallic Compounds; D011134:Polysaccharides / Q000096:biosynthesis; D051381:Rats; D017207:Rats, Sprague-Dawley; D012459:Salicylates
chemical_list: D009942:Organometallic Compounds; D011134:Polysaccharides; D012459:Salicylates; C015715:bismuth subsalicylate; D008358:Mannose; D001729:Bismuth; D005690:Galactose