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The effects of lipophilic ions on the intramembrane charge movement and intracellular calcium transient were studied using freshly dissociated skeletal muscle cells from mice fetuses. The lipophilic cations Rhodamine 6G and tetraphenylphosphonium (TPP) immobilized part of the intramembrane charge movement in a dose-dependent manner, and inhibited both calcium transient and contraction evoked by membrane depolarization. In contrast, the lipophilic anion 1-anilinonaphthalene-8-sulfonic acid (ANS) had no effect on intramembrane charge movement. We suggest that the lipophilic cations block the voltage-sensing mechanism for the excitation-contraction (E-C) coupling mechanism.

Effect of Lipophilic lons on the Intramembrane Charge Movement and Intracellular Ca2+ Release in Fetal Mouse Skeletal Muscle Cells.