title: Digestion and gastrointestinal absorption of the 14-16-kDa rice allergens.
abstract: The digestibility and gastrointestinal absorption of 14-16-kDa rice allergens (RAs) were investigated. RAs and bovine serum albumin (BSA) were first evaluated for their digestibility. BSA was digested completely by in vitro incubation with some proteases, but RAs remained almost intact. Administered orally (20 mg per mouse), intact RAs were clearly detected in the small intestine even 60 min after the administration, the amount of total RAs in the small intestine being estimated to be 0.59 mg. RAs were then biotinylated and infused into the duodenal lumen of anesthetized mice, and portal blood was collected. The RA concentrations in the portal plasma were respectively estimated to be 0.4-0.9 and 0.3-2.5 microg/ml for 0.4 and 4 mg doses. These results suggest that RAs are highly resistant to digestive enzymes and that about 1/100 of orally administered RAs remain intact in the small intestine, while at least 1/1,000-1/10,000 is absorbed and delivered into circulated blood.
authors.affiliation: School of Nutritional Sciences, Nagoya University of Arts and Sciences, Aichi, Japan.
authors.forename: Chikako
authors.initials: C
authors.lastname: Yamada
authors.forename: Yukari
authors.initials: Y
authors.lastname: Yamashita
authors.forename: Ryotaro
authors.initials: R
authors.lastname: Seki
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Izumi
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Matsuda
authors.forename: Yasuko
authors.initials: Y
authors.lastname: Kato
mesh_terms: D000284:Administration, Oral; D000485:Allergens / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism*; D000818:Animals; D019921:Biotinylation; D002417:Cattle; D004032:Diet; D004063:Digestion; D006868:Hydrolysis; D007408:Intestinal Absorption; D008297:Male; D051379:Mice; D012275:Oryza / Q000737:chemistry / Q000378:metabolism*; D010599:Pharmacokinetics; D012710:Serum Albumin, Bovine / Q000737:chemistry / Q000378:metabolism
chemical_list: D000485:Allergens; D012710:Serum Albumin, Bovine