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Voltage-gated Ca2+ currents in the human pathophysiologic heart: a review
J P Bénitah1, A M Gómez, J Fauconnier
1INSERM U-390, Physiopathologie Cardiovasculaire, CHU Arnaud de Villeneuve, 34295 Montpellier Cedex 5, France.
Human cardiac L-type calcium currents (I(Ca-L)) are crucial for heart function and drug targets. Research in human cells reveals insights into atrial fibrillation and heart failure, though T-type currents remain unrecorded.
Area of Science:
- Cardiology
- Molecular Physiology
- Biophysics
Background:
- L-type calcium current (I(Ca-L)) is central to cardiac excitation-contraction coupling.
- It is a primary target for drugs modulating heart function and inotropy.
- Human cardiomyocyte studies, though recent, offer valuable insights into cardiac ion currents.
Purpose of the Study:
- To review human cardiac calcium currents, focusing on I(Ca-L).
- To explore the role of I(Ca-L) in atrial fibrillation and heart failure pathophysiology.
- To highlight unresolved questions regarding human cardiac calcium currents.
Main Methods:
- Patch-clamp techniques.
- Enzymatic cell dissociation.
- Surgical techniques for tissue acquisition.
Main Results:
- Significant progress in understanding human I(Ca-L) in normal and diseased tissues.
- I(Ca-L) alterations are implicated in chronic atrial fibrillation.
- Divergent findings exist regarding I(Ca-L) in heart failure; T-type currents (I(Ca-T)) are unrecorded in human cells.
Conclusions:
- Human studies have advanced the understanding of cardiac I(Ca-L) and its role in disease.
- Further research is needed to resolve discrepancies in heart failure findings and to investigate T-type currents.
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