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Intracellular calcium signalling in striated muscle cells
1University of Oslo, Ullevaal Hospital, Norway.
Scandinavian Journal of Clinical and Laboratory Investigation
|December 16, 1997
Summary
Cellular calcium signaling relies on communication between cell membrane and ER/SR channels. This study explores the link between voltage-operated channels and ryanodine receptors in muscle, crucial for calcium release.
Area of Science:
- Cellular Biology
- Molecular Physiology
- Muscle Physiology
Background:
- Calcium signaling is vital for cellular functions, involving interactions between cell membrane and internal stores like the ER/SR.
- Cytosolic calcium levels are regulated by influx through various channels and release from intracellular stores.
Purpose of the Study:
- To investigate the functional connection between voltage-operated calcium channels (VOCs) and ryanodine receptors (RyRs) in cardiac and skeletal muscle.
- To elucidate the mechanisms of calcium release amplification from the sarcoplasmic reticulum (SR).
Main Methods:
- Focus on the 'synaptic' coupling between L-type calcium channels (a type of VOC) and RyRs.
- Analysis of calcium release mechanisms: voltage-controlled calcium release (skeletal muscle) and calcium-induced calcium release (heart).
Main Results:
- Depolarization opens VOCs, which in turn trigger RyR-mediated calcium release from the SR, termed a 'calcium spark'.
- Distinct coupling mechanisms exist: mechanical link in skeletal muscle and calcium influx in cardiac muscle.
Conclusions:
- The communication between VOCs and RyRs is essential for muscle excitation-contraction coupling.
- Dysfunctional RyR control or function may underlie various muscle disorders, including heart failure and malignant hyperthermia.