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• W2043409898 abstract "The precipitate which resulted when (57)CoB(12) bound to normal human gastric juice was subjected to a 15% concentration of Na(2)SO(4) contained virtually no radioactivity. However, after in vivo incubation of the gastric juice-(57)CoB(12) mixture in the distal ileum of the guinea pig, the dialyzed extract of the washed mucosa contained a fraction of (57)CoB(12) which was precipitated at 15% Na(2)SO(4). In addition, in vitro incubation of gastric juice-(57)CoB(12) with an extract of the ileal mucosa or brush border membranes also resulted in the formation of a 15% Na(2)SO(4)-insoluble fraction which contained (57)CoB(12). The formation of this (57)CoB(12)-containing insoluble fraction did not occur or was diminished by (a) addition of an excess of B(12)-free normal human gastric juice. (b) reducing the incubation pH to 2, (c) incubating the mixture at 4 degrees C, (d) pretreating the ileal extract at 56 degrees C for 30 min, (e) incubating the reaction in sodium EDTA but not calcium EDTA, (f) incubating gastric juice-(57)CoB(12) with an extract of jejunal mucosa. Sephadex gel filtration was used to demonstrate that the factor in the ileal extract which reacted with the gastric juice-(57)CoB(12) filtered through G-100 and G-200 columns in the excluded volume. When the ileal extract obtained after in vivo incubation with gastric juice-(57)CoB(12) was subjected to starch gel electrophoresis one peak of radioactivity remained at the origin and another moved anodally. Eluates of each peak reacted with anti-intrinsic factor antibody indicating that at least the immunologically reacting portion of the intrinsic factor molecule was present in two fractions with different electrophoretic mobility.These studies indicate that immunologically intact intrinsic factor can be extracted from the ileum after in vivo incubation with gastric juice-(57)CoB(12), and that a macromolecular factor is present in the distal ileal mucosa which binds intrinsic factor both in vitro and in vivo, changing its solubility and electrophoretic properties. It is suggested that this ileal binding factor is the previously postulated intestinal receptor for intrinsic factor." @default.
• W2043409898 created "2016-06-24" @default.
• W2043409898 creator A5056019879 @default.
• W2043409898 date "1968-04-01" @default.
• W2043409898 modified "2023-09-24" @default.
• W2043409898 title "Identification of a macromolecular factor in the ileum which binds intrinsic factor and immunologic identification of intrinsic factor in ileal extracts" @default.
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• W2043409898 doi "https://doi.org/10.1172/jci105783" @default.
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