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Calcium channel current in rat dental pulp cells.
1Division of Basic Sciences, 345 East 24th Street, New York University College of Dentistry, New York, NY 10010-4087, USA.
The Journal of Membrane Biology
|November 4, 2000
Summary
Researchers identified two types of calcium currents (T-type and L/N-type) in rat dental pulp cells. These voltage-gated calcium channels may play a role in forming reparative dentin.
Area of Science:
- Biophysics
- Cell Biology
- Dental Research
Background:
- Dental pulp cells possess voltage-gated calcium channels.
- Understanding these channels is crucial for dental pulp biology and regeneration.
Purpose of the Study:
- To characterize voltage-gated calcium currents in early-passage rat dental pulp cells.
- To identify the specific types of calcium channels present and their potential roles.
Main Methods:
- Whole-cell patch-clamp electrophysiology was used to record currents.
- Pharmacological agents (lanthanum, Bay-K, nifedipine, omega-Conotoxin GVIA) were employed to differentiate channel types.
- Kinetic analysis distinguished between fast and slow inactivating currents.
Main Results:
- Two distinct calcium currents, I(f) and I(s), were identified.
- I(f) exhibited fast inactivation and was blocked by lanthanum, suggesting T-type calcium channels.
- I(s) showed slow inactivation, was sensitive to L-type channel modulators, and blocked by omega-Conotoxin GVIA, indicating L- and N-type calcium channels.
Conclusions:
- Rat dental pulp cells express T-type, L-type, and N-type voltage-gated calcium channels.
- These channels are likely involved in the mineral-inductive properties of dental pulp cells and reparative dentin formation.