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Calcium Inhibition of Cytoplasmic Streaming

  • Hozumi Kawamichi
  • Akio Nakamura
  • Kazuhiro Kohama

Abstract

Cytoplasmic streaming is commonly observed in plant cells, where organelles associated with myosin move along the actin cables that run beneath the cell membrane. The driving force for the streaming is produced by the interaction of myosin with actin in a similar way to muscle contraction. In muscle cells, cytoplasmic Ca2+ concentration ([Ca2+] i ) is mostly kept at low levels, i.e., submicromolar levels. When the cell is excited, [Ca2+] i increases up to micromolar levels. The increase in [Ca2+] i , causes the actin-myosin interaction so that the muscle contracts. When [Ca2+] i returns to submicromolar levels, the interaction is abolished and the muscle relaxes (Ebashi and Endo, 1968).

Keywords

Light Chain Actin Filament Regulatory Light Chain Cytoplasmic Streaming Physarum Polycephalum 
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Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • Hozumi Kawamichi
    • 1
  • Akio Nakamura
    • 1
  • Kazuhiro Kohama
    • 1
  1. 1.Department of PharmacologyGunma University School of MedicineMaebashi, GunmaJapan

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