期刊
JOURNAL OF MOLECULAR AND CELLULAR CARDIOLOGY
卷 45, 期 5, 页码 603-607出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.yjmcc.2008.07.004
关键词
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资金
- NHLBI NIH HHS [P01 HL062426-090006, P01 HL062426, R01 HL077195, R01 HL077195-04] Funding Source: Medline
Heart failure is characterised by depressed myocyte contractility and is considered to involve a complex malfunction of adrenergic regulation, Ca2+-handling and the contractile apparatus. Most studies on the contractile apparatus have focussed on troponin, the Ca2+-dependent regulator of myofibrillar activity. Importantly, phosphorylation of troponin I secondary to beta-adrenergic receptor activation is known to induce reduced myofilament Ca(2+)sensitivity. In muscle samples from explanted failing human hearts, troponin I phosphorylation levels are very low and Ca2+-sensitivity is high. In contrast, some animal models used to study the mechanisms of heart failure give the opposite result-high levels of troponin I phosphorylation and low Ca2+-sensitivity. Which is right? (C) 2008 Elsevier Inc. All rights reserved.
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