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- W2101476502 abstract "Previous studies showed increased phospholemman (PLM) mRNA after myocardial infarction (MI) in rats (Sehl PD, Tai JTN, Hillan KJ, Brown LA, Goddard A, Yang R, Jin H, and Lowe DG. Circulation 101: 1990-1999, 2000). We tested the hypothesis that, in normal adult rat cardiac myocytes, PLM overexpression alters contractile function and cytosolic Ca(2+) concentration ([Ca(2+)](i)) homeostasis in a manner similar to that observed in post-MI myocytes. Compared with myocytes infected by control adenovirus expressing green fluorescent protein (GFP) alone, Western blots indicated a 41% increase in PLM expression after 72 h (P < 0.001) but no changes in Na(+)/Ca(2+) exchanger, SERCA2, and calsequestrin levels in myocytes infected by adenovirus expressing GFP and PLM. At 5 mM extracellular [Ca(2+)] ([Ca(2+)](o)), maximal contraction amplitudes in PLM-overexpressed myocytes were 24% (P < 0.005) and [Ca(2+)](i) transient amplitudes were 18% (P < 0.05) lower than control myocytes. At 0.6 mM [Ca(2+)](o), however, contraction and [Ca(2+)](i) transient amplitudes were significantly (P < 0.05) higher in PLM-overexpressed than control myocytes (18% and 42%, respectively); at 1.8 mM [Ca(2+)](o), the differences in contraction and [Ca(2+)](i) transient amplitudes were narrowed. This pattern of contractile and [Ca(2+)](i) transient abnormalities in PLM-overexpressed myocytes mimics that observed in post-MI rat myocytes. We suggest that PLM overexpression observed in post-MI myocytes may partly account for contractile abnormalities by perturbing Ca(2+) fluxes during excitation-contraction." @default.
- W2101476502 created "2016-06-24" @default.
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- W2101476502 date "2002-08-01" @default.
- W2101476502 modified "2023-10-18" @default.
- W2101476502 title "Overexpression of phospholemman alters contractility and [Ca<sup>2+</sup>]<sub>i</sub>transients in adult rat myocytes" @default.
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- W2101476502 doi "https://doi.org/10.1152/ajpheart.00197.2002" @default.
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