Abstract
Bioavailability of iron from human milk is known to be high. This may be due to a receptor-mediated mechanism in the small intestine that facilitates the absorption of iron from lactoferrin. Our aim in this study was to evaluate the ontogeny and localization of lactoferrin receptors within the small intestine. The piglet was used as an animal model because lactoferrin is a major iron-binding protein in both human and porcine milk. Kinetics of lactoferrin interaction with its receptor and receptor density were determined in relation to the age of the piglet (day 0-21 after birth) and the location (duodenum, jejunum, and ileum) within the small intestine. Specific and saturable binding of 59Fe-labelled pig lactoferrin by brush border membranes purified from piglet intestine was observed. Pig transferrin, human, and bovine lactoferrin did not bind to the porcine lactoferrin receptor. Lactoferrin binding occurred throughout the intestine independent of age of the piglet; receptor number (15 × 1014/mg protein) and affinity (Kd = 3 × 10-7 M) were relatively constant from birth until weaning. Thus, it is possible that lactoferrin receptors throughout the intestine may play a role in iron absorption throughout infancy.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 528-533 |
| Number of pages | 6 |
| Journal | The Journal of Nutritional Biochemistry |
| Volume | 4 |
| Issue number | 9 |
| DOIs | |
| State | Published - 1993 |
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Keywords
- iron
- iron-binding protein
- lactoferrin
- lactoferrin receptor
- milk
- piglets
ASJC Scopus subject areas
- Biochemistry
- Endocrinology, Diabetes and Metabolism
Cite this
Lactoferrin receptors in piglet small intestine : Lactoferrin binding properties, ontogeny, and regional distribution in the gastrointestinal tract. / Gíslason, Jóhannes; Iyer, Suhasini; Hutchens, T. William; Lönnerdal, Bo.
In: The Journal of Nutritional Biochemistry, Vol. 4, No. 9, 1993, p. 528-533.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Lactoferrin receptors in piglet small intestine
T2 - Lactoferrin binding properties, ontogeny, and regional distribution in the gastrointestinal tract
AU - Gíslason, Jóhannes
AU - Iyer, Suhasini
AU - Hutchens, T. William
AU - Lönnerdal, Bo
PY - 1993
Y1 - 1993
N2 - Bioavailability of iron from human milk is known to be high. This may be due to a receptor-mediated mechanism in the small intestine that facilitates the absorption of iron from lactoferrin. Our aim in this study was to evaluate the ontogeny and localization of lactoferrin receptors within the small intestine. The piglet was used as an animal model because lactoferrin is a major iron-binding protein in both human and porcine milk. Kinetics of lactoferrin interaction with its receptor and receptor density were determined in relation to the age of the piglet (day 0-21 after birth) and the location (duodenum, jejunum, and ileum) within the small intestine. Specific and saturable binding of 59Fe-labelled pig lactoferrin by brush border membranes purified from piglet intestine was observed. Pig transferrin, human, and bovine lactoferrin did not bind to the porcine lactoferrin receptor. Lactoferrin binding occurred throughout the intestine independent of age of the piglet; receptor number (15 × 1014/mg protein) and affinity (Kd = 3 × 10-7 M) were relatively constant from birth until weaning. Thus, it is possible that lactoferrin receptors throughout the intestine may play a role in iron absorption throughout infancy.
AB - Bioavailability of iron from human milk is known to be high. This may be due to a receptor-mediated mechanism in the small intestine that facilitates the absorption of iron from lactoferrin. Our aim in this study was to evaluate the ontogeny and localization of lactoferrin receptors within the small intestine. The piglet was used as an animal model because lactoferrin is a major iron-binding protein in both human and porcine milk. Kinetics of lactoferrin interaction with its receptor and receptor density were determined in relation to the age of the piglet (day 0-21 after birth) and the location (duodenum, jejunum, and ileum) within the small intestine. Specific and saturable binding of 59Fe-labelled pig lactoferrin by brush border membranes purified from piglet intestine was observed. Pig transferrin, human, and bovine lactoferrin did not bind to the porcine lactoferrin receptor. Lactoferrin binding occurred throughout the intestine independent of age of the piglet; receptor number (15 × 1014/mg protein) and affinity (Kd = 3 × 10-7 M) were relatively constant from birth until weaning. Thus, it is possible that lactoferrin receptors throughout the intestine may play a role in iron absorption throughout infancy.
KW - iron
KW - iron-binding protein
KW - lactoferrin
KW - lactoferrin receptor
KW - milk
KW - piglets
UR - http://www.scopus.com/inward/record.url?scp=43949167351&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=43949167351&partnerID=8YFLogxK
U2 - 10.1016/0955-2863(93)90089-F
DO - 10.1016/0955-2863(93)90089-F
M3 - Article
AN - SCOPUS:43949167351
VL - 4
SP - 528
EP - 533
JO - Journal of Nutritional Biochemistry
JF - Journal of Nutritional Biochemistry
SN - 0955-2863
IS - 9
ER -