Dome formation in the human colon carcinoma cell line Caco-2 in culture. Influence of ouabain and permeable supports.
We studied formation of domes in cell monolayers of the human colon carcinoma cell line Caco-2 which has been shown to exhibit signs of enterocytic differentiation and transport properties. After a 24 hr incubation with 4 X 10(-8) M ouabain, the number of domes seen on Caco-2 cell monolayers grown on plastic dishes was not significantly altered. After a 90 min preincubation with ouabain, 86rubidium uptake by Caco-2 cells was inhibited by ouabain, indicating that the cells have an ouabain-sensitive Na+, K+-ATPase, while dome formation was unaffected by ouabain. Domes were observed in Caco-2 cell monolayers grown on Nuclepore filters when the pore size was 0.015 micron but not when it was 0.030 micron. Our results suggest that dome formation in the Caco-2 cell line could be independent of Na+, K+-ATPase activity and might be due to accumulation of molecules having an effective hydrodynamic radius comprised between 0.015 and 0.030 micron.
Ramond
M J
MJ
Martinot-Peignoux
M
M
Erlinger
S
S
D001693:Biological Transport, Active / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects*; D002460:Cell Line; D002463:Cell Membrane Permeability / Q000187:drug effects*; D003110:Colonic Neoplasms / Q000473:pathology*; D004573:Electrolytes / Q000378:metabolism; D004847:Epithelial Cells; D006801:Humans; D008851:Micropore Filters; D010042:Ouabain / Q000494:pharmacology*; D011868:Radioisotopes; D012413:Rubidium / Q000378:metabolism; D013997:Time Factors
D004573:Electrolytes; D011868:Radioisotopes; D010042:Ouabain; D012413:Rubidium