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Involvement of extracellular cAMP-specific phosphodiesterase in the control of motile activity of Physarum polycephalum plasmodium

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Abstract

Possible involvement of extracellular cAMP-specific phosphodiesterase in the control of cell motile behavior has been investigated in Physarum polycephalum plasmodium, a multinuclear amoeboid cell with the autooscillatory mode of motility. It was found that the rate of the hydrolysis of 10 mM cAMP by a partially purified preparation of cAMP-specific phosphodiesterase secreted by the plasmodium in the course of migration decreases 20–30 times under the action of 1 mM dithiothreitol. In the presence of 1–5 mM of this strong reducing agent, the onset of the plasmodium spreading and the transition to the stage of migration were delayed in a concentration-dependent manner. In accordance with the morphological pattern of motile behavior, the duration of the maintenance of high frequency autooscillations, which normally precede the increase in the rate of the spreading and appear also in response to the application of attractants at spatially uniform concentrations, strongly increased by the action of dithiothreitol. The results obtained suggest that the autocrine production of cAMP and extracellular cAMP-specific phosphodiesterase is an important constituent of the mechanism controlling the motile behavior of the Physarum polycephalum plasmodium.

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Authors and Affiliations

  1. Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia

    N. B. Matveeva, M. A. Morozov, A. R. Nezvetsky, T. G. Orlova, V. A. Teplov & S. I. Beylina

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  1. N. B. Matveeva
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  2. M. A. Morozov
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  3. A. R. Nezvetsky
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  4. T. G. Orlova
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  5. V. A. Teplov
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  6. S. I. Beylina
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Original Russian Text © N.B. Matveeva, M.A. Morozov, A.R. Nezvetsky, T.G. Orlova, V.A. Teplov, S.I. Beylina, 2010, published in Biofizika, 2010, Vol. 55, No. 6, pp. 1076–1082.

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Matveeva, N.B., Morozov, M.A., Nezvetsky, A.R. et al. Involvement of extracellular cAMP-specific phosphodiesterase in the control of motile activity of Physarum polycephalum plasmodium. BIOPHYSICS 55, 982–986 (2010). https://doi.org/10.1134/S0006350910060163

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  • DOI: https://doi.org/10.1134/S0006350910060163

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