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KMID : 0311120010420030333
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Yonsei Medical Journal
2001 Volume.42 No. 3 p.333 ~ p.337
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Hypoxia Delays the Intracellular Ca2+ Clearance by Na+-Ca2+ Exchanger in Human Adult Cardiac Myocytes
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Seung Il Park
Eun Ju Park/Nak Hyun Kim/Wan Ki Baek*/Young Tak Lee†/Cheol Joo Lee‡/Chang Kook Suh
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Abstract
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Transient myocardial ischemia during cardiac surgery causes a loss of energy sources, contractile depression, and accumulation of metabolites and H+ ion resulting in intracellular acidosis. The reperfusion following ischemic cardioplegia recovers intracellular pH, activates Na+-H+ exchange and Na+-Ca2+ exchange transports and consequently produces Ca2+ overload, which yields cell death. Among the various Ca2+ entry pathways, the Na+-Ca2+ exchanger is known to play one of the major roles during the ischemia/reperfusion of cardioplegia. Consequently, information on the changes in intracellular Ca2+ activities of human cardiac myocytes via the Na+-Ca2+ exchanger is imperative despite previous measurements of Ca2+ current of human single myocytes. In this study, human single myocytes were isolated from the cardiac tissues obtained during open-heart surgery and intracellular Ca2+ activity was measured with cellular imaging techniques employing fluorescent dyes. We report that the Na+-Ca2+ exchanger of adult cardiac myocytes is more susceptible to hypoxic insult than that of young patients.
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KEYWORD
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Human, Na+-Ca2+ exchanger, hypoxia, adult cardiac myocytes,
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