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Biophysical effects of the natural product euplotin C on the Paramecium membrane
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Biophysical effects of the natural product euplotin C on the Paramecium membrane
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Journal Article
Biophysical effects of the natural product euplotin C on the Paramecium membrane
2009
Overview
The effect of euplotin C—a cytotoxic secondary metabolite produced by the protist ciliate Euplotes crassus—on the voltage-dependent Ca²⁺ channel activity was studied in a single-celled system by analyzing the swimming behavior of Paramecium. When the intraciliary Ca²⁺ concentration associated with plasma membrane depolarization increases, a reversal in the direction of ciliary beating occurs, and consequently the swimming direction changes. The ciliary reversal duration is correlated with the amount of Ca²⁺ influx. The present study demonstrates that the duration of continuous ciliary reversal (CCR), triggered by high external KCl concentrations, is longer in euplotin C-treated cells. Using selective Ca²⁺ channel blockers, we demonstrate that euplotin C modulates Ca²⁺ channels similar to the T- and L-types that occur in mammalian cells. Indeed, the increase of CCR duration significantly decreased when flunarizine and nimodipine-verapamil blockers were employed. Membrane fluidity measurements using a fluorescent dye, 6-lauroyl-2-dimethylaminonaphtalene (laurdan), indicated that membranes in euplotin C-treated cells are more tightly packed and ordered than membranes in control cells. Our data suggest that euplotin C enhances backward swimming in our unicellular model system by interacting with the ciliary Ca²⁺ channel functions through the reduction of cell membrane fluidity.
Publisher
Berlin/Heidelberg : Springer-Verlag,Springer-Verlag,Springer Nature B.V
Subject
/ Biomedical and Life Sciences
/ calcium
/ Calcium Channel Blockers - pharmacology
/ Cell Membrane - drug effects
/ Cell Membrane - ultrastructure
/ Dose-Response Relationship, Drug
/ Euplotes
/ mammals
/ Membrane Potentials - drug effects
/ Sesquiterpenes - pharmacology
/ Swimming
/ Trace Elements - pharmacology
/ Zoology
