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- W2046529642 abstract "The permeability of several cell lines, including HeLa, L929, 3T6 and 3T3, to various compounds is affected by the concentration of divalent cations in the culture medium. In the absence of Mg2+ ions but with 4-8 mM CaCl2 in the medium, HeLa and L929 cells become permeabilized, as measured by the entry of the aminoglycoside antibiotic hygromycin B. However, 3T3 and 3T6 cells become much more permeable when calcium and magnesium are both absent from the medium. Addition of Mg2+ above 2 mM abolishes the permeabilization induced by Ca2+. Basic pH favors permeabilization, whereas acidic pH inhibits the entry of hygromycin B. Increased entry of macromolecules, such as the toxin alpha-sarcin, horseradish peroxidase (HRP) and luciferase, is also observed under permeabilization conditions, suggesting that this method could be of general use, since it is not harmful to cells and is fully reversible. Exit of 86Rb+ ions and [3H]uridine-labelled nucleotides was also assayed. We did not observe increased release of these compounds from preloaded cells under various calcium concentrations. Finally, the effects of several inhibitors of endocytosis and other membrane functions on the permeabilization inhibitors of endocytosis and other membrane functions on the permeabilization process were also analysed. The entry of alpha-sarcin was not affected by nifedipine, dibucaine or mepacrine, but was partially inhibited by NH4Cl, amantadine and chloroquine." @default.
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- W2046529642 date "1987-04-01" @default.
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- W2046529642 title "Control of membrane permeability in animal cells by divalent cations" @default.
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- W2046529642 doi "https://doi.org/10.1016/0014-4827(87)90213-8" @default.
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