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Dynamics of the cytoskeleton inAmoeba proteus: II. Influence of different agents on the spatial organization of microinjected fluorescein-labeled actin

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Summary

Iodoacetamido-fluorescein-(IAF)-labeled actin was microinjected into normal locomotingAmoeba proteus. Thereafter (30–60 minutes) changes in the cytoplasmic fluorescence distribution pattern and contractile activity were induced by internal and external chemical stimulation. Different agents such as phalloidin, procaine, 2.4-dinitrophenol (DNP), puromycin, ouabain and n-ethyl maleimide (NEM) interfere with the excitation-contraction mechanism involved in ordered pseudopodium formation during ameboid movement and cause various morphogenetic reactions based on actin polymerization-depolymerization cycles. Most frequent changes are (a) local condensation of IAF-actin and formation of a continuous IAF-actin layer at the cytoplasmic surface of the cell membrane and around the pulsating vacuole, (b) immobilization and hyalo-granuloplasm separation by combined contraction and detachment of the IAF-actin layer from the cell membrane, (c) organized and disorganized formation of pseudopodia by local contraction and disintegration of the IAF-actin layer, and (d) alterations in the rheological properties of the protoplasmic matrix by changes in the molecular state of soluble actin not incorporated into the cytoskeleton. The experimental approaches to the function of the actomyosin system in large amebas attainable by the method ofin vivo molecular cytochemistry are discussed in detail with respect to the participation of the cytoskeleton in motive force generation for cytoplasmic streaming and ameboid movement.

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Authors and Affiliations

  1. Institut für Zytologie, UniversitÄt Bonn, Ulrich-Haberland-Strasse 61a, D-5300, Bonn 1, Federal Republic of Germany

    H. -U. Hoffmann, W. Stockem & B. Gruber

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  1. H. -U. Hoffmann
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  2. W. Stockem
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  3. B. Gruber
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Hoffmann, H.U., Stockem, W. & Gruber, B. Dynamics of the cytoskeleton inAmoeba proteus: II. Influence of different agents on the spatial organization of microinjected fluorescein-labeled actin. Protoplasma 119, 79–92 (1984). https://doi.org/10.1007/BF01287820

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