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- W2021081870 abstract "Abstract: The effect of increasing the cytoplasmic levels of various divalent cations on the release of [ 3 H]acetylcholine ([ 3 H]ACh) from synaptosomes was investigated. Synaptosomes prepared from rat brain and prelabeled with [ 3 H]choline were incubated with liposomes containing Mg 2+ , Ca 2+ , Mn 2+ , Co 2+ , Sr 2+ , or Ba 2+ . This treatment allows the transfer of the aqueous contents of the liposomes to the cytoplasm of the synaptosomes. The efflux of radioactivity subsequent to this treatment was measured, and the relative proportions of [ 3 H]ACh and [ 3 H]choline were determined. The release of radioactivity from synaptosomes incubated with liposomes containing Mg 2+ , Mn 2+ , or Co 2+ was not altered when compared with synaptosomes incubated either without liposomes or with liposomes containing isotonic K + /Na + . Synaptosomes incubated with liposomes containing Ca 2+ , Sr 2+ , or Ba 2+ , however, released significantly more radioactivity than did controls. Moreover, the released radioactivity consisted almost entirely of [ 3 H]ACh. Liposomes containing either Ca 2+ or Sr 2+ were equally effective in promoting the release of [ 3 H]ACh from synaptosomes, whereas liposomes containing Ba 2+ were 2.5 times more effective in promoting the release of [ 3 H]ACh than were liposomes containing either Ca 2+ or Sr 2+ . Since liposomes introduce their aqueous contents into cytoplasm via a mechanism not involving plasma membrane channels, the increased release of [ 3 H]ACh caused by liposomes containing Ca 2+ , Sr 2+ , or Ba 2+ is attributable to an increase in the intrasynaptosomal concentration of these ions, and not to their passage through calcium channels." @default.
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- W2021081870 date "1983-03-01" @default.
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- W2021081870 title "Effect of Liposomes Containing Various Divalent Cations on the Release of Acetylcholine from Synaptosomes" @default.
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- W2021081870 doi "https://doi.org/10.1111/j.1471-4159.1983.tb08033.x" @default.
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