Distribution and Regulation of L-Type Ca2+ Channels in Cardiomyocyte Microdomains

  • Alexey V. Glukhov
  • Anamika Bhargava
  • Julia Gorelik
Chapter
First Online:
Part of the Cardiac and Vascular Biology book series (Abbreviated title: Card. vasc. biol.)

Abstract

Cardiac excitation involves action potential generation by individual cells and its conduction from cell to cell through intercellular gap junctions. Excitation of the cellular membrane results in opening of the voltage-gated L-type Ca2+ channels, which allow a small amount of Ca2+ to enter the cell. This triggers the release of a much greater amount of Ca2+ from the intracellular Ca2+ store, the sarcoplasmic reticulum, and gives rise to the systolic Ca2+ transient and contraction. These processes are highly regulated by the autonomic nervous system, which ensures the acute and reliable contractile function of the heart and the short-term modulation of this function upon changes in heart rate or workload. Recently, it became evident that discrete clusters of L-type Ca2+ channels exist in the sarcolemma, where they form an interacting network with regulatory proteins and receptors. It allows the specificity, reliability, and accuracy of autonomic modulation of the excitation-contraction processes by a variety of neurohormonal pathways. Disruption in subcellular targeting of calcium channels and associated signaling pathways may contribute to the pathophysiology of a variety of cardiac diseases including heart failure and certain arrhythmias. This chapter reviews the emerging understanding of microdomain-specific distribution, functioning, regulation, and remodeling of L-type Ca2+ channels in atrial and ventricular myocytes and their contributions to the cellular signaling and cardiac pathology.

Keywords

L-type calcium channel Cardiomyocyte Microdomain Caveolin Calcium signaling Remodeling Heart failure Atrial fibrillation 
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Notes

Compliance with Ethical Standards

Conflict of Interest Statement

The authors declare that they have no conflict of interest.

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© Springer International Publishing AG 2017

Authors and Affiliations

  • Alexey V. Glukhov
    • 1
  • Anamika Bhargava
    • 2
  • Julia Gorelik
    • 3
  1. 1.Department of MedicineUniversity of Wisconsin-Madison School of Medicine and Public HealthMadisonUSA
  2. 2.Department of BiotechnologyIndian Institute of Technology Hyderabad, KandiSangareddyIndia
  3. 3.Department of Cardiovascular Sciences, Imperial Centre for Translational and Experimental MedicineNational Heart and Lung Institute, Imperial CollegeLondonUK

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