Cell and Tissue Research

, Volume 261, Issue 1, pp 145–154 | Cite as

Cytoskeletal organization and cell organelle transport in basal epithelial cells of the freshwater sponge Spongilla lacustris

  • Dieter Wachtmann
  • Wilhelm Stockem
  • Norbert Weissenfels


Different antibodies against actin, tubulin and cytokeratin were utilized to demonstrate the spatial organization of the cytoskeleton in basal epithelial cells of the freshwater sponge Spongilla lacustris. Accordingly, actin is localized in a cortical layer beneath the plasma membrane and in distinct fibers within the cytoplasmic matrix. Microtubules exhibit a different distributional pattern by radiating from a perinuclear sheath and terminating at, the cell periphery; in contrast, intermediate filaments are lacking. Cytoplasmic streaming activity was studied by in-vivo staining of mitochondria and endoplasmic reticulum by means of fluorescent dyes. Single-frame analysis of such specimens revealed a regular shuttle movement of mitochondria and other small particles between the cell nucleus and the plasma membrane, which can be stopped in a reversible manner with the use of colcemid or colchicine but not with cytochalasin D. The results point to the microtubular system as a candidate for cell organelle transport, whereas the actomyosin system rather serves for changes in cellular shape and motility.

Key words

Organelle transport Cytoskeleton Colcemid Cytochalasin Spongilla lacustris (Porifera) 


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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • Dieter Wachtmann
    • 1
  • Wilhelm Stockem
    • 1
  • Norbert Weissenfels
    • 2
  1. 1.Institute of CytologyUniversity of BonnBonnFederal Republic of Germany
  2. 2.Institute of ZoologyUniversity of BonnBonnFederal Republic of Germany

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