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[The contractile heart. Cellular and subcellular aspects]

T H Larsen1

  • 1Institutt for anatomi og cellebiologi, Universitetet i Bergen.

Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke
|December 10, 1994
PubMed
Summary
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Excitation-contraction coupling in cardiac muscle involves action potential-induced calcium release from the sarcoplasmic reticulum. This calcium-mediated release, crucial for synchronized heart contraction, occurs via structural couplings called calcium synapses.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Cell Physiology

Context:

  • Excitation-contraction coupling (ECC) links cardiac action potentials to muscle contraction.
  • Myocardial function relies on synchronized cell-to-cell action potential propagation.
  • Calcium ion (Ca++) dynamics are central to both action potential propagation and myofibrillar contraction.

Purpose:

  • To characterize the molecular and structural components mediating subcellular transformation of action potentials into cardiac muscle contraction.
  • To elucidate the role of calcium release from the sarcoplasmic reticulum in cardiac excitation-contraction coupling.

Summary:

  • The action potential triggers contraction via voltage-dependent L-type Ca(++)-channels opening.
  • This stimulates Ca++ release from the sarcoplasmic reticulum, a process described as Ca(++)-mediated Ca(++)-release.

Related Experiment Videos

  • This mechanism is graded and involves specialized structures termed 'Ca++ synapses' within cardiac muscle cells.

    • Impact:

    • Provides a detailed understanding of the subcellular mechanisms driving cardiac muscle contraction.
    • Identifies key molecular players and structural components essential for synchronized heartbeats.
    • Offers insights into potential targets for modulating cardiac contractility.