Uptake of ingested bovine lactoferrin and its accumulation in adult mouse tissues.
Lactoferrin is a glycoprotein with antimicrobial and immunoregulatory properties, which is found in milk, other external secretions, and in the secondary granules of neutrophils. The present study examined the time course of uptake and the pattern of tissue accumulation of bovine lactoferrin (bLf) following intragastric intubation of a single dose to adult naïve mice or to mice daily fed bLf for 4 weeks. Following ingestion, bLf was transferred from the intestine into peripheral blood in a form with intact molecular weight (80 kDa) and localized within 10 to 20 min after oral administration in the liver, kidneys, gall bladder, spleen, and brain of both groups of mice. Immunoreactive bLf could also be detected in the luminal contents of the stomach, small intestine and colon 1 h after intragastric intubation. Interestingly, serum and tissue accumulation of bLf was approximately 50% lower in mice chronically fed this protein than in those given only the single oral dose. Furthermore, significant levels of bLf-specific IgA and IgG antibodies as well as bLf-containing IgA- and IgG immune complexes were detected in mice chronically fed bLf but not in those fed only once. Taken together, these results indicate that bLf resists major proteolytic degradation in the intestinal lumen and is readily absorbed in an antigenic form in blood and various mouse tissues. Chronic ingestion of lactoferrin reduces its uptake, probably through mechanisms such as immune exclusion, which minimize potential harmful reactions to food products.
INRA, UMR 914 Nutrition Physiology and Ingestive Behavior, AgroParisTech, 16 rue Claude Bernard, F75231 Paris Cedex 05, France.
Romy
R
Fischer
Hajer
H
Debbabi
Anne
A
Blais
Michel
M
Dubarry
Michèle
M
Rautureau
Prosper N
PN
Boyaka
Daniel
D
Tome
D000284:Administration, Oral; D000818:Animals; D001921:Brain / Q000378:metabolism; D002417:Cattle; D005260:Female; D005704:Gallbladder / Q000378:metabolism; D041981:Gastrointestinal Tract / Q000378:metabolism; D007070:Immunoglobulin A / Q000097:blood; D007074:Immunoglobulin G / Q000097:blood; D007408:Intestinal Absorption; D007668:Kidney / Q000378:metabolism; D007781:Lactoferrin / Q000008:administration & dosage / Q000097:blood / Q000276:immunology* / Q000493:pharmacokinetics*; D008099:Liver / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D013154:Spleen / Q000378:metabolism; D014018:Tissue Distribution
D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007781:Lactoferrin