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Published online 14 May 2001. doi:10.1083/jcb.153.4.763
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© The Rockefeller University Press, 0021-9525/2001/5/763/ $5.00
The Journal of Cell Biology, Volume 153, Number 4, May 14, 2001 763-772


Original Article

Alterations at the Intercalated Disk Associated with the Absence of Muscle LIM Protein

Elisabeth Ehlera, Robert Horowitsb, Christian Zuppingera, Robert L. Pricec, Evelyne Perriarda, Martin Leua, Pico Caronid, Mark Sussmane, Hans M. Eppenbergera, and Jean-Claude Perriarda
a Institute of Cell Biology, Swiss Federal Institute of Technology, CH-8093 Zürich, Switzerland
b Laboratory of Physical Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892
c Department of Developmental Biology and Anatomy, University of South Carolina, Columbia, South Carolina 29208
d Friedrich Miescher Institute Basel, CH-4002 Basel, Switzerland
e The Children's Hospital and Research Foundation, Cincinnati, Ohio 45229

Correspondence to: Jean-Claude Perriard, Institute of Cell Biology, ETH-Hönggerberg, CH-8093 Zürich, Switzerland. Tel:41-1-6333359 Fax:41-1-6331069 E-mail:jcp{at}cell.biol.ethz.ch.

In this study, we investigated cardiomyocyte cytoarchitecture in a mouse model for dilated cardiomyopathy (DCM), the muscle LIM protein (MLP) knockout mouse and substantiated several observations in a second DCM model, the tropomodulin-overexpressing transgenic (TOT) mouse. Freshly isolated cardiomyocytes from both strains are characterized by a more irregular shape compared with wild-type cells. Alterations are observed at the intercalated disks, the specialized areas of mechanical coupling between cardiomyocytes, whereas the subcellular organization of contractile proteins in the sarcomeres of MLP knockout mice appears unchanged. Distinct parts of the intercalated disks are affected differently. Components from the adherens junctions are upregulated, desmosomal proteins are unchanged, and gap junction proteins are downregulated. In addition, the expression of N-RAP, a LIM domain– containing protein located at the intercalated disks, is upregulated in MLP knockout as well as in TOT mice. Detailed analysis of intercalated disk composition during postnatal development reveals that an upregulation of N-RAP expression might serve as an early marker for the development of DCM. Altered expression levels of cytoskeletal proteins (either the lack of MLP or an increased expression of tropomodulin) apparently lead to impaired function of the myofibrillar apparatus and to physiological stress that ultimately results in DCM and is accompanied by an altered appearance and composition of the intercalated disks.

Key Words: dilated cardiomyopathy, N-RAP, tropomodulin, adherens junction, gap junction


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