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- W1640776676 abstract "In this study, we investigated the effect of the anticancer drug doxorubicin on Ca2+ fluxes of isolated highly purified sarcoplasmic reticulum fractions (longitudinal tubules and terminal cisternae (Saito, A., Seiler, S., Chu, A., and Fleischer, S. (1984) J. Cell Biol. 99, 875-885] and of chemically skinned skeletal muscle fibers of the rabbit. In terminal cisternae, doxorubicin inhibits Ca2+ uptake (IC50 at 0.5 microM) and increases 2.6-fold Ca2+-dependent ATPase rate (half-maximal activation at 3 microM) and unidirectional Ca2+ efflux (8-fold stimulation at 25 microM). On the contrary, doxorubicin is without effect on longitudinal tubules. In skinned muscle fibers, doxorubicin induces rapid and transient Ca2+ release, as measured by tension development (half-maximal stimulation at 6 microM), which is completely and reversibly inhibited by ruthenium red, a known inhibitor of Ca2+ release from isolated terminal cisternae. Doxorubicin has no effect on the sarcoplasmic reticulum Ca2+ pump and on the contractile apparatus of skinned muscle fibers. It is concluded that doxorubicin activates Ca2+ release from sarcoplasmic reticulum and opens a Ca2+ efflux pathway (Ca2+ channel) selectively localized in terminal cisternae. Doxorubicin might interact with Ca2+ channels involved in physiological Ca2+ release." @default.
- W1640776676 created "2016-06-24" @default.
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- W1640776676 date "1985-06-01" @default.
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- W1640776676 title "Doxorubicin induces calcium release from terminal cisternae of skeletal muscle. A study on isolated sarcoplasmic reticulum and chemically skinned fibers." @default.
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- W1640776676 doi "https://doi.org/10.1016/s0021-9258(17)39615-1" @default.
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