title: Adhesion of Salmonella enterica serotype Enteritidis isolates to chicken isthmal glandular secretions.
abstract: The ability of Salmonella enterica serotype Enteritidis isolates to adhere to immobilized secretions of the isthmus of the laying hen was determined in an ELISA-type assay. One-third of the 56 isolates tested in the logarithmic growth phase, adhered to the isthmal secretions. Using a binding assay of the isolates to thin paraffin sections of the oviduct, we demonstrated that the receptor of the adhesion was localized inside the tubular gland cells of the isthmus. The adhesion to immobilized isthmal secretions as well as to the paraffin sections was blocked by the addition of mannose. A fimD mutant of S. Enteritidis, lacking type 1 fimbriae, did not adhere, confirming that the adhesion was mediated by type 1 fimbriae. Mannosylated glycoproteins were demonstrated in the isthmus glandular cells using confocal laser scanning microscopy by FITC-labelled Lens culinaris lectins. It is hypothesized that the binding of S. Enteritidis to isthmal secretions could play a role in the contamination of eggs through incorporation of the bacteria in the shell membranes.
authors.affiliation: Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium. jeroen.debuck@rug.ac.be
authors.forename: Jeroen
authors.initials: J
authors.lastname: De Buck
authors.forename: Filip
authors.initials: F
authors.lastname: Van Immerseel
authors.forename: Godelieve
authors.initials: G
authors.lastname: Meulemans
authors.forename: Freddy
authors.initials: F
authors.lastname: Haesebrouck
authors.forename: Richard
authors.initials: R
authors.lastname: Ducatelle
mesh_terms: D000818:Animals; D001422:Bacterial Adhesion / Q000502:physiology; D002645:Chickens; D004528:Egg Shell / Q000382:microbiology; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D005260:Female; D010861:Fimbriae, Bacterial / Q000378:metabolism / Q000502:physiology; D008358:Mannose / Q000378:metabolism; D018613:Microscopy, Confocal / Q000662:veterinary; D010057:Oviducts / Q000378:metabolism* / Q000382:microbiology* / Q000473:pathology; D037121:Plant Lectins / Q000378:metabolism; D011201:Poultry Diseases / Q000382:microbiology* / Q000473:pathology; D012481:Salmonella Infections, Animal / Q000382:microbiology* / Q000473:pathology; D012477:Salmonella enteritidis / Q000502:physiology*
chemical_list: D037121:Plant Lectins; C033619:lentil lectin; D008358:Mannose