Cardiac dysfunction and heart failure are associated with abnormalities in the subcellular distribution and amounts of oligomeric muscle LIM protein

1 Department of Physiology and Biophysics, and 2 Cardiology Unit, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois; 3 Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania; 4 Cardiovascular Institute, Loyola University Medical Center, Maywood, Illinois; a...

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Veröffentlicht in:American journal of physiology. Heart and circulatory physiology 2007-01, Vol.292 (1), p.H259-H269
Hauptverfasser: Boateng, Samuel Y, Belin, Rashad J, Geenen, David L, Margulies, Kenneth B, Martin, Jody L, Hoshijima, Masahiko, de Tombe, Pieter P, Russell, Brenda
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container_end_page H269
container_issue 1
container_start_page H259
container_title American journal of physiology. Heart and circulatory physiology
container_volume 292
creator Boateng, Samuel Y
Belin, Rashad J
Geenen, David L
Margulies, Kenneth B
Martin, Jody L
Hoshijima, Masahiko
de Tombe, Pieter P
Russell, Brenda
description 1 Department of Physiology and Biophysics, and 2 Cardiology Unit, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois; 3 Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania; 4 Cardiovascular Institute, Loyola University Medical Center, Maywood, Illinois; and 5 Center for Research in Biological Systems and Department of Medicine, University of California San Diego, La Jolla, California Submitted 17 July 2006 ; accepted in final form 3 September 2006 Prolonged hemodynamic overload results in cardiac hypertrophy and failure with detrimental changes in myocardial gene expression and morphology. Cysteine-rich protein 3 or muscle LIM protein (MLP) is thought to be a mechanosensor in cardiac myocytes. Therefore, the subcellular location of MLP may have functional implications in health and disease. Our hypothesis is that MLP becomes mislocalized after prolonged overload, resulting in impaired mechanosensing in cardiac myocytes. Using the techniques of biochemical subcellular fractionation and immunocytochemistry, we found MLP exhibits oligomerization in the membrane and cytoskeleton of cultured cardiac rat neonatal myocytes. Nuclear MLP was always monomeric. MLP translocated to the nucleolus in response to 10% cyclic stretch at 1 Hz for 48 h. This was associated with a threefold increase in S6 ribosomal protein ( P < 0.01; n = 3 cultures). Adenoviral overexpression of MLP also resulted in a twofold increase in S6 protein, suggesting that MLP can activate ribosomal protein synthesis in the nucleolus. In ventricles from aortic-banded and myocardially infarcted rat hearts, nuclear MLP increased by twofold ( P < 0.01; n = 7) along with a significant decrease in the nonnuclear oligomeric fraction. The ratio of nuclear to nonnuclear MLP increased threefold in both groups ( P < 0.01; n = 7). In failing human hearts, there was almost a complete loss of oligomeric MLP. Using a flag-tagged adenoviral MLP, we demonstrate that the COOH terminus is required for oligomerization and that this is a precursor to stretch sensing and subsequent nuclear translocation. Therefore, reduced oligomeric MLP in the costamere and cytoskeleton may contribute to impaired mechanosensing in heart failure. hypertrophy; mechanosensing; cytoskeleton; nucleocytoplasmic shuttling Address for reprint requests and other correspondence: B. Russell, Dept. of Physiology and Biophysics (M/C 901), Univ. of Illinois at Chicago, 835 S. Wolcott Ave., Chicago IL 6061
doi_str_mv 10.1152/ajpheart.00766.2006
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Cysteine-rich protein 3 or muscle LIM protein (MLP) is thought to be a mechanosensor in cardiac myocytes. Therefore, the subcellular location of MLP may have functional implications in health and disease. Our hypothesis is that MLP becomes mislocalized after prolonged overload, resulting in impaired mechanosensing in cardiac myocytes. Using the techniques of biochemical subcellular fractionation and immunocytochemistry, we found MLP exhibits oligomerization in the membrane and cytoskeleton of cultured cardiac rat neonatal myocytes. Nuclear MLP was always monomeric. MLP translocated to the nucleolus in response to 10% cyclic stretch at 1 Hz for 48 h. This was associated with a threefold increase in S6 ribosomal protein ( P &lt; 0.01; n = 3 cultures). Adenoviral overexpression of MLP also resulted in a twofold increase in S6 protein, suggesting that MLP can activate ribosomal protein synthesis in the nucleolus. 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Heart and circulatory physiology</title><addtitle>Am J Physiol Heart Circ Physiol</addtitle><description>1 Department of Physiology and Biophysics, and 2 Cardiology Unit, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois; 3 Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania; 4 Cardiovascular Institute, Loyola University Medical Center, Maywood, Illinois; and 5 Center for Research in Biological Systems and Department of Medicine, University of California San Diego, La Jolla, California Submitted 17 July 2006 ; accepted in final form 3 September 2006 Prolonged hemodynamic overload results in cardiac hypertrophy and failure with detrimental changes in myocardial gene expression and morphology. Cysteine-rich protein 3 or muscle LIM protein (MLP) is thought to be a mechanosensor in cardiac myocytes. Therefore, the subcellular location of MLP may have functional implications in health and disease. Our hypothesis is that MLP becomes mislocalized after prolonged overload, resulting in impaired mechanosensing in cardiac myocytes. Using the techniques of biochemical subcellular fractionation and immunocytochemistry, we found MLP exhibits oligomerization in the membrane and cytoskeleton of cultured cardiac rat neonatal myocytes. Nuclear MLP was always monomeric. MLP translocated to the nucleolus in response to 10% cyclic stretch at 1 Hz for 48 h. This was associated with a threefold increase in S6 ribosomal protein ( P &lt; 0.01; n = 3 cultures). Adenoviral overexpression of MLP also resulted in a twofold increase in S6 protein, suggesting that MLP can activate ribosomal protein synthesis in the nucleolus. In ventricles from aortic-banded and myocardially infarcted rat hearts, nuclear MLP increased by twofold ( P &lt; 0.01; n = 7) along with a significant decrease in the nonnuclear oligomeric fraction. 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Cysteine-rich protein 3 or muscle LIM protein (MLP) is thought to be a mechanosensor in cardiac myocytes. Therefore, the subcellular location of MLP may have functional implications in health and disease. Our hypothesis is that MLP becomes mislocalized after prolonged overload, resulting in impaired mechanosensing in cardiac myocytes. Using the techniques of biochemical subcellular fractionation and immunocytochemistry, we found MLP exhibits oligomerization in the membrane and cytoskeleton of cultured cardiac rat neonatal myocytes. Nuclear MLP was always monomeric. MLP translocated to the nucleolus in response to 10% cyclic stretch at 1 Hz for 48 h. This was associated with a threefold increase in S6 ribosomal protein ( P &lt; 0.01; n = 3 cultures). Adenoviral overexpression of MLP also resulted in a twofold increase in S6 protein, suggesting that MLP can activate ribosomal protein synthesis in the nucleolus. 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Wolcott Ave., Chicago IL 60612-7342 (e-mail: russell{at}uic.edu )</abstract><cop>United States</cop><pub>American Physiological Society</pub><pmid>16963613</pmid><doi>10.1152/ajpheart.00766.2006</doi></addata></record>
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subjects Animals
Animals, Newborn
Cardiology
Cardiovascular system
Cells, Cultured
Heart failure
Heart Failure - complications
Heart Failure - metabolism
Heart Failure - pathology
LIM Domain Proteins
Mechanotransduction, Cellular
Medical research
Muscle Proteins - metabolism
Myocytes, Cardiac - metabolism
Proteins
Rats
Rats, Sprague-Dawley
Subcellular Fractions - metabolism
Tissue Distribution
Ventricular Dysfunction, Left - complications
Ventricular Dysfunction, Left - metabolism
Ventricular Dysfunction, Left - pathology
title Cardiac dysfunction and heart failure are associated with abnormalities in the subcellular distribution and amounts of oligomeric muscle LIM protein
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