Transverse Stiffness of Myofibrils of Skeletal and Cardiac Muscles Studied by Atomic Force Microscopy

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  • Akiyama Nao
    Department of Physics (Biophysics Section), Faculty of Science, Tokyo University of Science
  • Ohnuki Yoshiki
    Department of Physiology, Tsurumi University School of Dental Medicine
  • Kunioka Yuki
    Department of Physics (Biophysics Section), Faculty of Science, Tokyo University of Science
  • Saeki Yasutake
    Department of Physiology, Tsurumi University School of Dental Medicine
  • Yamada Takenori
    Department of Physics (Biophysics Section), Faculty of Science, Tokyo University of Science

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The transverse stiffness of single myofibrils of skeletal and cardiac muscles was examined by atomic force microscopy. The microscopic images of both skeletal and cardiac myofibrils in a rigor state showed periodical striation patterns separated by Z-bands, which is characteristic of striated muscle fibers. However, sarcomere patterns were hardly distinguishable in the stiffness distributions of the relaxed myofibrils of skeletal and cardiac muscles. Myofibrils in a rigor state were significantly stiff compared with those in a relaxed state, and in each state, cardiac myofibrils were significantly stiffer compared with skeletal myofibrils. By proteolytic digestions of sarcomere components of myofibrils, it was suggested that cardiac myofibrils are laterally stiffer than skeletal myofibrils because Z-bands, connectin (titin) filament networks, and other components of sarcomere structures for the former myofibrils are stronger than those for the latter.<br>

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