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Myocardial Infarction in Mice Alters Sarcomeric Function Via Post-Translational Protein Modification

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Title: Myocardial Infarction in Mice Alters Sarcomeric Function Via Post-Translational Protein Modification
Author(s): Avner, Benjamin S.; Shioura, Krystyna M.; Scruggs, Sarah B.; Geenen, David L.; Helseth, Donald L. Jr.; Farjah, Mariam; Goldspink, Paul H.; Solaro, R. John
Subject(s): myocardial infarction reactive oxygen species Ca-sensitivity ATPase rate protein phosphorylation
Abstract: Myocardial physiology in the aftermath of myocardial infarction (MI) before remodeling is an under-explored area of investigation. Here, we describe the effects of MI on the cardiac sarcomere with focus on the possible contributions of reactive oxygen species. We surgically induced MI in 6-7-month-old female CD1 mice by ligation of the left anterior descending coronary artery. Data were collected 3-4 days after MI or sham (SH) surgery. MI hearts demonstrated ventricular dilatation and systolic dysfunction upon echo cardiographic analysis. Sub-maximum Ca-activated tension in detergent-extracted fiber bundles from papillary muscles increased significantly in the preparations from MI hearts. Ca(2+) sensitivity increased after MI, whereas cooperativity of activation decreased. To assess myosin enzymatic integrity we measured splitting of Ca-ATP in myofibrillar preparations, which demonstrated a decline in Ca-ATPase activity of myofilament myosin. Biochemical analysis demonstrated post-translational modification of sarcomeric proteins. Phosphorylation of cardiac troponin I and myosin light chain 2 was reduced after MI in papillary samples, as measured using a phospho-specific stain. Tropomyosin was oxidized after MI, forming disulfide products detectable by diagonal non-reducing-reducing SDS-PAGE. Our analysis of myocardial protein oxidation post-MI also demonstrated increased S-glutathionylation. We functionally linked protein oxidation with sarcomere function by treating skinned fibers with the sulfhydryl reducing agent dithiothreitol, which reduced Ca(2+) sensitivity in MI, but not SH, samples. Our data indicate important structural and functional alterations to the cardiac sarcomere after MI, and the contribution of protein oxidation to this process.
Issue Date: 2012-04
Publisher: American Society for Biochemistry and Molecular Biology
Citation Info: Avner, B. S. Shioura, K. M. Scruggs, S. B. Grachoff, M. Geenen, D. L. Helseth, D. L., Jr. Farjah, M. Goldspink, P. H. John, Solaro R.. Myocardial infarction in mice alters sarcomeric function via post-translational protein modification. Journal of Biological Chemistry. 2012;363(1-2):203-215. doi: 10.1007/s11010-011-1172-z
Type: Article
Description: This research was originally published in Avner BS, Shioura KM, Scruggs SB, Grachoff M, Geenen DL, Helseth DL Jr, Farjah M, Goldspink PH, Solaro RJ. Myocardial infarction in mice alters sarcomeric function via post-translational protein modification. Mol Cell Biochem. 2012 Apr;363(1-2):203-15. © the American Society for Biochemistry and Molecular Biology
URI: http://hdl.handle.net/10027/10591
ISSN: 1573-4919
Sponsor: This work was supported by American Heart Association-Midwest Pre-Doctoral Fellowship 2008-06682- 00-00 (BSA) and by NIH Grants T32 007692 (BSA, KMS, SBS) and PO1 HL062426 (RJS, DLG, PHG).
Date Available in INDIGO: 2013-11-22
 

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