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A voltage-dependent calcium current in mouse Swiss 3T3 fibroblasts
1Department of General Physiology and Biochemistry, University of Milan, Italy.
Pflugers Archiv : European Journal of Physiology
|May 1, 1988
Summary
Swiss 3T3 mouse fibroblasts exhibit a voltage-dependent calcium channel. This channel allows calcium ion influx triggered by depolarization, identified through patch-clamp electrophysiology.
Area of Science:
- Cellular Electrophysiology
- Ion Channel Biology
- Mammalian Cell Physiology
Background:
- Swiss 3T3 mouse fibroblasts are a common model for cellular studies.
- Understanding ion channel function is crucial for cell signaling and function.
Purpose of the Study:
- To investigate the presence and properties of voltage-dependent ion channels in Swiss 3T3 fibroblasts.
- To characterize the ion selectivity and gating mechanisms of identified channels.
Main Methods:
- Whole-cell patch-clamp recordings were utilized to measure ionic currents.
- Experiments involved voltage-clamp protocols and ionic substitutions in the extracellular solution.
Main Results:
- Depolarization elicited a rapidly activating, inactivating inward current.
- The current was dependent on extracellular calcium (Ca2+) and sodium (Na+), but persisted when Na+ was replaced.
- The current was blocked by cobalt (Co2+) and showed voltage-dependent characteristics consistent with a Ca2+ channel.
Conclusions:
- Swiss 3T3 fibroblasts possess functional voltage-dependent calcium channels.
- These channels contribute to calcium influx in response to membrane depolarization.
- The findings provide insights into calcium signaling mechanisms in these cells.