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Neomycin inhibits the calcium current of Paramecium
1Department of Molecular Biology, University of Wisconsin, Madison.
Abstract:
The duration of high-K+ stimulated backward swimming is a commonly used bioassay for estimating the amplitude of the inward calcium current of Paramecium. Electrophysiological analysis confirmed that concentrations of neomycin which decreased the duration of stimulated backward swimming also reduced the isolated inward calcium current. Other polycations were also effective in this bioassay and their effectiveness was correlated with the number of their positive charges. Paramecium is therefore a convenient model system for studying the effects of compounds such as neomycin on calcium currents as well as their mechanisms of action.
Insights
Paramecium backward swimming duration effectively estimates calcium current amplitude. Neomycin and other polycations reduce swimming duration by decreasing calcium currents, showing Paramecium
Area of Science:
- Cellular electrophysiology
- Pharmacology
- Protozoology
Background:
- Backward swimming duration in Paramecium is a bioassay for calcium current.
- Neomycin's effect on calcium currents needs further investigation.
Purpose of the Study:
- To investigate the relationship between neomycin concentration and Paramecium backward swimming duration.
- To explore the utility of Paramecium as a model for studying calcium current modulators.
Main Methods:
- Electrophysiological analysis of Paramecium.
- Bioassay using high-K+ stimulated backward swimming.
- Testing various polycations for their effects on calcium currents.
Main Results:
- Neomycin decreased both backward swimming duration and isolated calcium current.
- Effectiveness of polycations correlated with their positive charge number.
- Paramecium demonstrated a reliable response to neomycin's impact on calcium currents.
Conclusions:
- Paramecium backward swimming duration is a valid indicator of calcium current amplitude.
- Neomycin and other polycations affect calcium currents in Paramecium.
- Paramecium serves as a valuable model for studying calcium current mechanisms and drug effects.