Volume 38, Issue 5 (September 1993)

    Comparison of Postmortem Autolysis in Cardiac and Skeletal Muscle

    (Received 8 October 1992; accepted 10 February 1993)

    CODEN: JFSOAD

      Format Pages Price  
    PDF Version 7 $25   ADD TO CART


    Abstract

    To understand the mechanism in postmortem autolysis better, processes in the postmortem degradation of myofibril proteins in the presence of protease inhibitors were studied. Male Wistar rats were given injections of the carboxyl-, thiol-, and serine-protease inhibitors, pepstatin, Ep-475[L-transepoxysuccinyl-leucylamide(3-methyl) butane; E-64-C], and chymostatin, via the femoral vein. Control rats were similarly treated with saline. Then, myofibril proteins were isolated from their cardiac and femoral muscles and from those of control animals at various times after death, and degradation of these myofibril proteins with time was examined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis.

    In cardiac muscle, α-actinin was degraded rapidly, followed by the heavy chain of myosin and light chain of myosin (L2). Actin and the light chain of mosin (L1) were degraded slowly. The degradations of the heavy chain of myosin, α-actinin, tropomyosin and L2 after 14 days were not inhibited by pepstatin, but were inhibited by Ep-475 and chymostatin.

    In skeletal muscle, L1 and L2 were degraded rapidly, followed by the heavy chain of myosin and α-actinin. Actin was degraded slowly and was still unchanged 2 weeks after death. The degradations of protein components were inhibited by pepstatin, Ep-475 and chymostatin. These results indicated that after death the components of myofibrils are degraded by various proteases at various rates depending on their properties or structures. This degradation is fundamentally the same in cardiac and skeletal muscles, but inhibitors have somewhat different effects on the postmortem degradation processes after death in the two types of muscle.


    Author Information:

    Yamamoto, A
    Assistant, School of Medicine, The University of Tokushima, Tokushima,

    Tokunaga, I
    Lecturer, Researcher and Professor, School of Medicine, The University of Tokushima, Tokushima,

    Gotoda, M
    Lecturer, Researcher and Professor, School of Medicine, The University of Tokushima, Tokushima,

    Maeiwa, M
    Lecturer, Researcher and Professor, School of Medicine, The University of Tokushima, Tokushima,

    Takeichi, S
    Professor, Tokai University School of Medicine, Boseidai, Isehara-city,


    Stock #: JFS13523J

    ISSN: 0022-1198

    DOI: 10.1520/JFS13523J

    ASTM International
    is a member of CrossRef.

    Author
    Title Comparison of Postmortem Autolysis in Cardiac and Skeletal Muscle
    Symposium , 0000-00-00
    Committee E30