Effect of microtubule-disrupting drugs on protein and RNA synthesis in Physarum polycephalum amoebae |
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Authors: | Victor A. Bernstam Robert H. Gray Isadore A. Bernstein |
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Affiliation: | (1) Environmental Cellular Chemistry Laboratory, Department of Environmental and Industrial Health, School of Public Health, The University of Michigan, 48109 Ann Arbor, Michigan, USA |
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Abstract: | The effects of the microtubule-disrupting drugs, colchicine, vinblastine, podophyllotoxin, griseofulvin, and lumicolchicine (10-5 M), on protein and RNA synthesis were studied in Physarum polycephalum amoebae in culture. All, except lumicolchicine, were found to simultaneously reduce the rate of protein synthesis and stimulate RNA synthesis. These results parallel the effects seen in cells exposed to heat shock. Treatment of the cells with a microfilament-disrupting drug, cytochalasin B (10 g/ml in ethanol), resulted in a reduced rate of protein synthesis after 2 h compared to a similar effect by vinblastine in 5–15 min. A morphological abnormality, microtubule paracystals, were seen associated with centrioles in vinblastine-treated cells in which protein synthesis had been reduced by 50%. Vinblastine and podophyllotoxin were shown to interfere with the recovery of protein synthesis after inhibition by low or elevated temperatures. The possible role of microtubules in regulating the translational response of a cell to an external environmental stimulus is discussed. |
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Keywords: | Protein RNA synthesis Microtubules Microfilament-disrupting drugs Heat Cold shock Recovery |
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