Cardiac Ca2+ Signaling and Ca2+ Sensitizers
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- Endoh Masao
- Department of Cardiovascular Pharmacology, Yamagata University School of Medicine
Bibliographic Information
- Other Title
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- Cardiac Ca2+ signaling and Ca2+ sesitizers
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Abstract
The role of Ca2+ in cardiac excitation - contraction (E-C) coupling has been established by simultaneous measurements of contractility and Ca2+ transients by means of aequorin in intact myocardium and Ca2+ sensitive fluorescent dyes in single myocytes. The E-C coupling process can be classified into 3 processes: upstream (Ca2+ mobilization), central (Ca2+ binding to troponin C) and downstream mechanism (thin filament regulation and crossbridge cycling). These mechanisms are regulated differentially by various inotropic interventions. Positive force-frequency relationship and effects of β-adrenoceptor stimulation, phosphodiesterase 3 inhibitors and digitalis are essentially exerted via upstream mechanism. Alpha-adrenoceptor stimulation, endothelin-1, angiotensin II, and clinically available Ca2+ sensitizers, such as levosimendan and pimobendan, act by a combination of the upstream and central/downstream mechanism. The Frank-Starling mechanism and effects of Ca2+ sensitizers such as EMD 57033 and Org 30029 are primarily induced via the central/downstream mechanism. Whereas the upstream and central mechanisms are markedly suppressed in failing myocytes and under acidotic conditions, Ca2+ sensitizers such as EMD 57033 and Org 30029 can induce cardiotonic effects under such conditions. Ca2+ sensitizers have high therapeutic potential for the treatment of contractile dysfunction in congestive heart failure and ischemic heart diseases, because they have energetic advantages and less risk of Ca2+ overload and can maintain effectiveness under pathological conditions. (Circ J 2008; 72: 1915 - 1925)<br>
Journal
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- Circulation Journal
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Circulation Journal 72 (12), 1915-1925, 2008
The Japanese Circulation Society
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Keywords
Details 詳細情報について
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- CRID
- 1390282680082637440
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- NII Article ID
- 110006987343
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- NII Book ID
- AA11591968
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- COI
- 1:CAS:528:DC%2BD1MXkt1KqtA%3D%3D
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- ISSN
- 13474820
- 13469843
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- PubMed
- 18981594
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed