Linked Life Data

15155526

Source:http://linkedlifedata.com/resource/pubmed/id/15155526

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pubmed-article:15155526pubmed:abstractTextWe examined the effect of cardiac myosin binding protein-C (cMyBP-C) on contractile efficiency in isovolumically contracting left ventricle (LV) and on internal viscosity and oscillatory work production in skinned myocardial strips. A 6-week diet of 0.15% 6-n-propyl-2-thiouracil (PTU) was fed to wild-type (+/+(PTU)) and homozygous-truncated cMyBP-C (t/t(PTU)) mice starting at age approximately 8 weeks and leading to a myosin heavy chain (MHC) isoform profile of 10% alpha-MHC and 90% beta-MHC in both groups. Western blot analysis confirmed that cMyBP-C was present in the +/+(PTU) and effectively absent in the t/t(PTU). Total LV mechanical energy per beat was quantified as pressure-volume area (PVA). O2 consumption (Vo2) per beat was plotted against PVA at varying LV volumes. The reciprocal of the slope of the linear Vo2-PVA relation represents the contractile efficiency of converting O2 to mechanical energy. Contractile efficiency was significantly enhanced in t/t(PTU) (26.1+/-2.6%) compared with +/+(PTU) (17.1+/-1.6%). In skinned myocardial strips, maximum isometric tension was similar in t/t(PTU) (18.7+/-2.1 mN x mm(-2)) and +/+(PTU) (21.9+/-4.0 mN x mm(-2)), but maximum oscillatory work induced by sinusoidal length perturbations occurred at higher frequencies in t/t(PTU) (7.31+/-1.17 Hz) compared with +/+(PTU) (4.48+/-0.60 Hz) and was significantly more sensitive to phosphate concentration in the t/t(PTU). Under rigor conditions, the internal viscous load was significantly lower in the t/t(PTU) compared with +/+(PTU), ie, approximately 40% lower at 1 Hz. These results collectively suggest that contractile efficiency is enhanced in the t/t(PTU), probably through a reduced loss of mechanical energy by a viscous load normally provided by cMyBP-C and through a gain of phosphate-dependent oscillatory work normally inhibited by cMyBP-C.lld:pubmed
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pubmed-article:15155526pubmed:authorpubmed-author:SeidmanJ GJGlld:pubmed
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pubmed-article:15155526pubmed:dateRevised2011-11-17lld:pubmed
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pubmed-article:15155526pubmed:year2004lld:pubmed
pubmed-article:15155526pubmed:articleTitleEffect of cardiac myosin binding protein-C on mechanoenergetics in mouse myocardium.lld:pubmed
pubmed-article:15155526pubmed:affiliationDepartment of Molecular Physiology and Biophysics, University of Vermont College of Medicine, University of Vermont, Burlington, Vt 05405, USA. palmer@physiology.med.uvm.edulld:pubmed
pubmed-article:15155526pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15155526pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:15155526pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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