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Iron absorption by intestinal epithelial cells: 1. CaCo2 cells cultivated in serum-free medium, on polyethyleneterephthalate microporous membranes, as an in vitro model.

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Halleux, C. Schneider, Yves-Jacques [UCL]

Iron absorption by intestinal epithelial cells, passage onto plasmatic apotransferrin, and regulation of the process remain largely misunderstood. To investigate this problem, we have set up an in vitro model, consisting in CaCo2 cells (a human colon adenocarcinoma line, which upon cultivation displays numerous differentiation criteria of small intestine epithelial cells). Cells are cultivated in a serum-free medium, containing 1 microgram/ml insulin, 1 ng/ml epidermal growth factor, 10 micrograms/ml albumin-linoleic acid, 100 nM hydrocortisone, and 2 nM T3 on new, transparent, Cyclopore polyethyleneterephthalate microporous membranes coated with type I collagen. Cells rapidly adhere, grow, and form confluent monolayers; after 15 days, scanning electron microscopy reveals numerous uniform microvilli. Domes, which develop on nonporous substrata, are absent on high porosity membranes. Culture medium from upper and lower compartments of microplate inserts and cell lysates were immunoprecipitated after labeling with [3H]glucosamine and leucine; analysis was done by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), followed by autoradiography. [3H]transferrin is found mainly in the lower compartment and in cells; [3H]apolipoprotein B is released in both compartments, and fibronectin almost entirely recovered in the lower compartment; [3H]transferrin receptors and ferritin are only present in cell lysates. Binding experiments also show that transferrin receptors are accessible from the lower compartment. These results suggest that CaCo2 cells, cultivated in synthetic medium on membranes of appropriate porosity, could provide an in vitro model of the intestinal barrier, with the upper compartment of the culture insert corresponding to the apical pole facing the intestinal lumen and the lower one to the basal pole in contact with blood.

Document type Article de périodique (Journal article) – Journal Article, Research Support, Non-U.S. Gov't
Access type Accès restreint
Publication date 1991
Journal information "In vitro cellular & developmental biology : journal of the Tissue Culture Association" - Vol. 27A, no. 4, p. 293-302 (1991)
issn 0883-8364
Publication status Publié
Affiliation UCL
MESH Subject Adenocarcinoma ; Cell Adhesion ; Cell Division ; Cell Membrane Permeability ; Collagen ; Colonic Neoplasms ; Culture Media ; Epithelium - metabolism - ultrastructure ; Humans ; Immunosorbent Techniques ; Intestinal Absorption ; Iron - metabolism ; Microscopy, Electron, Scanning ; Models, Biological ; Polyethylene Terephthalates ; Receptors, Transferrin - metabolism ; Transferrin - metabolism ; Tumor Cells, Cultured
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Bibliographic reference Halleux, C. ; Schneider, Yves-Jacques. Iron absorption by intestinal epithelial cells: 1. CaCo2 cells cultivated in serum-free medium, on polyethyleneterephthalate microporous membranes, as an in vitro model.. In: In vitro cellular & developmental biology : journal of the Tissue Culture Association, Vol. 27A, no. 4, p. 293-302 (1991)
Permanent URL http://hdl.handle.net/2078.1/11302