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Calcium Sparks: Elementary Events Underlying Excitation-Contraction Coupling in Heart Muscle
Abstract
Spontaneous local increases in the concentration of intracellular calcium, called "calcium sparks," were detected in quiescent rat heart cells with a laser scanning confocal microscope and the fluorescent calcium indicator fluo-3. Estimates of calcium flux associated with the sparks suggest that calcium sparks result from spontaneous openings of single sarcoplasmic reticulum (SR) calcium-release channels, a finding supported by ryanodine-dependent changes of spark kinetics. At resting intracellular calcium concentrations, these SR calcium-release channels had a low rate of opening (∼0.0001 per second). An increase in the calcium content of the SR, however, was associated with a fourfold increase in opening rate and resulted in some sparks triggering propagating waves of increased intracellular calcium concentration. The calcium spark is the consequence of elementary events underlying excitation-contraction coupling and provides an explanation for both spontaneous and triggered changes in the intracellular calcium concentration in the mammalian heart.
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Cites
Glutamate Induces Calcium Waves in Cultured Astrocytes: Long-Range Glial Signaling
Cornell-Bell, A. H., Finkbeiner, S. M., Cooper, M. S., & Smith, S. J. (1990) · Science · doi:10.1126/science.1967852 · Cited by 1,846
Cited by
The versatility and universality of calcium signalling
Berridge, M. J., Lipp, P., & Bootman, M. D. (2000) · Nature Reviews Molecular Cell Biology · doi:10.1038/35036035 · Cited by 5,701
The endoplasmic reticulum: structure, function and response to cellular signaling
Schwarz, D. S., & Blower, M. D. (2016) · Cellular and Molecular Life Sciences · doi:10.1007/s00018-015-2052-6 · Cited by 1,613
Microdomains of Intracellular Ca2+: Molecular Determinants and Functional Consequences
Rizzuto, R., & Pozzan, T. (2006) · Physiological Reviews · doi:10.1152/physrev.00004.2005 · Cited by 1,206
Superoxide flashes in single mitochondria
Wang, W., Fang, H., Groom, L., Cheng, A., Zhang, W., Liu, J., Wang, X., Li, K., Han, P., Zheng, M., et al. (2008) · Cell · doi:10.1016/j.cell.2008.06.017 · Cited by 715
Self-citationCalcium microdomains: Organization and function
Berridge, M. J. (2006) · Cell Calcium · doi:10.1016/j.ceca.2006.09.002 · Cited by 525
Metadata
- Authors
- Cheng, H., Lederer, W. J., & Cannell, M. B.
- Venue
- Science
- Published
- 1993-10-29
- Volume
- 262
- Issue
- 5134
- Pages
- 740-744
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2054225000
- Cited by
- 1,935
- References
- 1
- FWCI
- 36.10
- Type
- journal article
- Language
- en
- Open access
- closed
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- Cheng, H., Lederer, W. J., & Cannell, M. B. (1993). Calcium Sparks: Elementary Events Underlying Excitation-Contraction Coupling in Heart Muscle. Science. https://doi.org/10.1126/science.8235594
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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
