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- W1498493338 abstract "Calcium ions that have been preloaded into isolated SR subfractions in the presence of ATP and pyrophosphate may be released upon addition of a large number of diverse pharmacologic substances in a manner that is effectively blocked by ruthenium red and other organic polyamines. Effective blocking substances include certain antibiotics (neomycin, gentamicin, streptomycin, clindamycin, kanamycin, and tobramycin), naturally occurring polyamines (spermine and spermidine), and a number of basic polypeptides and proteins (polylysine, polyarginine, certain histones, and protamine). These agents have only one feature in common: the presence of several amino groups. Ruthenium red, neomycin, spermine, and protamine all appear to act by blocking SR Ca2+ channels since unidirectional 45Ca2+ efflux from the vesicles is strongly inhibited by these agents. Functions ascribable to the SR Ca2+ pump are largely unaffected by these agents. Since inositol 1,4,5-trisphosphate is ineffective at inducing Ca2+ release under these conditions, we conclude that these polyamines may directly block SR Ca2+ channels at very low concentrations by a mechanism unrelated to effects on inositol 1,4,5-trisphosphate production." @default.
- W1498493338 created "2016-06-24" @default.
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- W1498493338 date "1987-05-01" @default.
- W1498493338 modified "2023-10-02" @default.
- W1498493338 title "Drug-induced Ca2+ release from isolated sarcoplasmic reticulum. III. Block of Ca2+-induced Ca2+ release by organic polyamines." @default.
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- W1498493338 doi "https://doi.org/10.1016/s0021-9258(18)45550-0" @default.
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