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Related Concept Videos

Feedback Regulation of Calcium Concentration01:27

Feedback Regulation of Calcium Concentration

Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
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Measuring Fast Calcium Fluxes in Cardiomyocytes
12:10

Measuring Fast Calcium Fluxes in Cardiomyocytes

Published on: November 29, 2011

A network-oriented perspective on cardiac calcium signaling.

Christopher H George1, Dimitris Parthimos, Nicole C Silvester

  • 1Wales Heart Research Institute and Institute of Molecular and Experimental Medicine, School of Medicine, Cardiff Univ., Heath Park, Cardiff, Wales, UK CF14 4XN. georgech@cf.ac.uk

American Journal of Physiology. Cell Physiology
|July 31, 2012
PubMed
Summary

Cardiac cellular signaling networks, particularly calcium (Ca2+) handling, are crucial for heart function. Maladaptive changes lead to desynchronization, causing arrhythmias and heart failure.

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Area of Science:

  • Cardiology
  • Systems Biology
  • Molecular Cell Biology

Background:

  • Heart function relies on synchronized cellular signaling networks.
  • Calcium (Ca2+) handling is central to cardiac cell signaling.
  • Network dynamics influence adaptability and response to stimuli.

Purpose of the Study:

  • To review cardiac signaling networks, focusing on Ca2+ handling.
  • To explain how network configuration impacts cardiac function.
  • To propose a model for disease development based on network dysfunction.

Main Methods:

  • Interpretation of experimental data from molecular, cellular, and transgenic models.
  • Application of concepts from cell network architecture and organization.
  • Analysis of Ca2+ signaling dynamics across various functional states.

Main Results:

  • Normal cardiac function depends on dynamic Ca2+ signaling network configurations.
  • (Mal)adaptive changes restrict network dynamic range, impairing responses.
  • Progressive desynchronization of the Ca2+ network underlies arrhythmias and heart failure.

Conclusions:

  • Pathologic cardiac conditions arise from Ca2+ signaling network desynchronization.
  • A systems-level understanding is key to developing new therapies.
  • Targeting network unraveling may prevent or reverse cardiac disease.