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Calcium Buffering in the Heart in Health and Disease
Godfrey L Smith1, David A Eisner2
1Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary, and Life Sciences, University of Glasgow, UK (G.L.S.).
Circulation
|May 15, 2019
Summary
Cardiac calcium (Ca2+) buffering significantly impacts myocyte function. Understanding buffer properties is crucial for interpreting Ca2+ signaling, contractility, and arrhythmias in heart failure.
Area of Science:
- Cardiology
- Molecular Biology
- Biophysics
Background:
- Intracellular Ca2+ concentration changes regulate cardiac myocyte function.
- Approximately 99% of cytoplasmic calcium in cardiac myocytes is bound to buffers.
- Buffer properties critically influence Ca2+ signaling.
Purpose of the Study:
- To examine the fundamental properties and identities of cardiac calcium buffers.
- To review methods for measuring these buffers.
- To assess the effects of buffering on the systolic Ca2+ transient.
Main Methods:
- Literature review on calcium buffer properties and measurement techniques.
- Analysis of the impact of buffering on Ca2+ transients.
- Examination of physiological and pathological conditions affecting buffering.
Main Results:
- Strong buffering of cytoplasmic calcium is a key feature of cardiac myocytes.
- Buffering influences the systolic Ca2+ transient under physiological and pathological conditions.
- Altered buffering is relevant to heart failure and arrhythmias.
Conclusions:
- The significant impact of calcium buffering on cardiac function may be underestimated.
- A comprehensive understanding of buffer properties is essential for cardiac calcium cycling and contractility.
- Further research into cardiac calcium buffers is needed.
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