title: Factors influencing intestinal microparticle uptake in vivo.
abstract: The aim of this study is to compare microparticle uptake in animals of different ages, gender and species and at different time points. The 2mum latex/in vivo in situ model uses the observation of animal responses or post-mortem changes and also particle identification by fluorescence microscopy in nine sequential intestinal segments and secondary sites. The wide size range of animals studied requires particle numbers in tissue compartments to be related to intestinal tissue section area through a circumference measurement. Area under the curve (AUC) data for particles in intestinal tissue are plotted against measurements of intestinal length, allowing comparisons to be made across different ages and species and between males and females. The percentage uptake of administered dose and particle numbers in macerated tissue are also reported. Some parameters, in particular species, do not appear to affect the extent of microparticle uptake, which ranges from 0.12 to 0.32% of the administered dose. Particle uptake does, however, vary with age, being significantly greater in young adult males (7 weeks) than in younger (3 weeks) and older (17 and 52 weeks) age groups. It is concluded that age is more important in determining the extent of uptake than gender or species.
authors.affiliation: Queen's University of Belfast, School of Medicine & Dentistry, 71 University Road, Belfast BT7 1NN, United Kingdom. Electronic address: m.mccullough@qub.ac.uk.
authors.forename: M
authors.initials: M
authors.lastname: Doyle-McCullough
authors.affiliation: Queen's University of Belfast, School of Medicine & Dentistry, 71 University Road, Belfast BT7 1NN, United Kingdom.
authors.forename: S H
authors.initials: SH
authors.lastname: Smyth
authors.affiliation: Department of Physiology, Anatomy and Genetics, Le Gros Clark Building, University of Oxford, United Kingdom.
authors.forename: S M
authors.initials: SM
authors.lastname: Moyes
authors.affiliation: Department of Physiology, Anatomy and Genetics, Le Gros Clark Building, University of Oxford, United Kingdom.
authors.forename: K E
authors.initials: KE
authors.lastname: Carr
mesh_terms: D000367:Age Factors; D000818:Animals; D019540:Area Under Curve; D004337:Drug Carriers; D005260:Female; D006168:Guinea Pigs; D007408:Intestinal Absorption; D007413:Intestinal Mucosa / Q000378:metabolism*; D007422:Intestines / Q000033:anatomy & histology; D007441:Intubation, Gastrointestinal; D007840:Latex / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism*; D008198:Lymph Nodes / Q000378:metabolism; D008297:Male; D051379:Mice; D008863:Microspheres; D010316:Particle Size; D010581:Peyer's Patches / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D012737:Sex Factors; D013045:Species Specificity
chemical_list: D004337:Drug Carriers; D007840:Latex