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• W1998365327 abstract "Multilamellar (MLV) and large unilamellar (LUV) lipid vesicles (liposomes) trap the metallochromic dye arsenazo III [2,7-bis(arsonophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid ] in their aqueous compartments. When ionophore A23187 was preincorporated into either MLV or LUV above 0.001 mol%, addition of Ca to the outside of liposomes produced spectral shifts characteristic of the Ca . AIII2 complex. The method permitted detection of two molecules of A23187 per liposome. Liposomes with A23187 were permselective: divalent cations were translocated in the order Mn greater than Ca greater than Sr greater than Mg congruent to Ba. Because prostaglandins (PGs) may act as Ca ionophores, we have incorporated into MLVs and LUVs stable prostaglandins (PGE2, PGI2, PGB1), endoperoxide analogs, and a water-soluble, polymeric derivative of PGB1:PGBx. None acted as ionophore. In contrast, when added to the outside of preformed MLV or LUV, PGBx, at concentrations above 1 micro M, provoked permselective uptake of Ca equivalent to that induced by 10 nM A23187. These studies demonstrate not only that liposomes containing arsenazo III may be employed in a sensitive asssay for agents that translocate divalent cations, but that a water-soluble derivative of a naturally occurring fatty acid, PGBx, is a potent ionophore." @default.
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• W1998365327 title "A general method, employing arsenazo III in liposomes, for study of calcium ionophores: results with A23187 and prostaglandins." @default.
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• W1998365327 doi "https://doi.org/10.1073/pnas.77.3.1506" @default.
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