title: Rat, ovine and bovine Peyer's patches mounted in horizontal diffusion chambers display sampling function.
abstract: Freshly excised rat, ovine and bovine ileal Peyer's patch (PP) and non-Peyer's patch tissues (NPP) were mounted in modified horizontal polyethylene diffusion chambers with a range of window areas. Rat tissue was initially used to establish that barrier function and histology were maintained for up to 60 min. Horse-radish peroxidase (HRP) fluxes and S. Typhimurium adherence and invasion were significantly higher in rat PP over NPP. Particle uptake was shown to be a rapid, energy-, time-, and size-dependent process, occurring more readily in PP than NPP tissue in each species. In a kinetic analysis, particles were localized initially in the follicle-associated epithelium and then in the dome region. For NPP uptake, particles were initially localized to villous epithelium, and were then detected in the crypts and lamina propria. Electrophysiological parameters including pharmacologically-stimulated inward short-circuit current responses were determined in isolated PP and NPP from each species mounted under identical conditions in Ussing chambers. In conclusion, comparative functional and histological characteristics of PP from several species were demonstrated in horizontal diffusion chambers. Horizontal diffusion chambers are therefore a useful in vitro model in which a range of functions including transport of particulate formulations by PP may be examined.
authors.affiliation: School of Agriculture, Food Science and Veterinary Medicine and Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland.
authors.forename: Jyoti
authors.initials: J
authors.lastname: Soni
authors.forename: Alan W
authors.initials: AW
authors.lastname: Baird
authors.forename: Leah M
authors.initials: LM
authors.lastname: O'Brien
authors.forename: Maire
authors.initials: M
authors.lastname: McElroy
authors.forename: John J
authors.initials: JJ
authors.lastname: Callanan
authors.forename: Hugh F
authors.initials: HF
authors.lastname: Bassett
authors.forename: Deirdre
authors.initials: D
authors.lastname: Campion
authors.forename: David J
authors.initials: DJ
authors.lastname: Brayden
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D001422:Bacterial Adhesion; D002417:Cattle; D015194:Diffusion Chambers, Culture; D004594:Electrophysiology; D016650:Fluorescein-5-isothiocyanate; D005456:Fluorescent Dyes; D007413:Intestinal Mucosa / Q000378:metabolism; D008297:Male; D049329:Nanostructures; D010581:Peyer's Patches / Q000033:anatomy & histology / Q000737:chemistry* / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D012486:Salmonella typhimurium / Q000378:metabolism; D012756:Sheep
chemical_list: D005456:Fluorescent Dyes; D000469:Alkaline Phosphatase; D016650:Fluorescein-5-isothiocyanate