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- W2106142208 abstract "A technique for the efficient entrapment of high concentrations of Ca2+ in large unilamellar phospholipid vesicles (LUVs), using the carboxylic acid antibiotic ionophore A23187 (calcimycin) is demonstrated. It is shown that rapid A23187-mediated entrapment of Ca2+, corresponding to essentially 100% sequestration of the extravesicular cation may be achieved for egg yolk phosphatidylcholine LUVs (100 nm) in the presence of a transmembrane proton gradient (acidic interior). Interior-exterior concentration cation gradients of over 400-fold may be readily achieved, with interior Ca2+ concentrations in excess of 250 mM. It is shown that the extent and efficiency of the A23187-mediated uptake process is affected by the intravesicular buffering capacity and the extravesicular Ca2+ concentration in a manner that is consistent with a Ca2(+)-H+ exchange process. In the absence of a pH gradient, or the presence of a reversed gradient (basic interior), only background levels of cation uptake are detected. The driving force for A23187-mediated uptake of Ca2+ is shown to depend on the intravesicular proton pool rather than on a chelation process. This protocol provides a novel method for the efficient entrapment of high concentrations of Ca2+ and other cations in phospholipid vesicles." @default.
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- W2106142208 date "1990-06-01" @default.
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- W2106142208 title "A novel method for the efficient entrapment of calcium in large unilamellar phospholipid vesicles" @default.
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- W2106142208 doi "https://doi.org/10.1016/0005-2736(90)90197-v" @default.
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