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Electric pulse-induced fusion of mouse lymphoma cells: Roles of divalent cations and membrane lipid domains

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Summary

Mouse leukemic lymphoblasts (L5178Y) brought into close contact by dielectrophoresis underwent cell fusion following the application of electrical pulses in the presence of electrolytes. The electrically fused cells became spherical after switching off the dielectrophoretic field. Fusion between a cell vitally stained with Janus Green and that with Neutral Red resulted in the homokaryon with a mixed color. Intracellular potentials simultaneously recorded from the two cells located on both sides of the homokaryon were identical. The fusion efficiency was remarkably dependent upon temperature, displaying a discontinuity at about 11°C in the Arrhenius plot. The extracellular application of phospholipase-A2 or-C suppressed the fusion yield. Thus, it appears that the phospholipid domains play a crucial role in the electric pulse-induced cell fusion. Treatment of the cells with proteolytic enzymes markedly enhanced the fusion yield, presumably due to removing the glycocalix and/or giving rise to fusion-potent, protein-free lipid domains. The presence of millimolar concentrations of divalent cations (irrespective of Mg2+ or Ca2+) as well as of micromolar concentrations of Ca2+ (but not Mg2+) was prerequisite to the resealing of membranes suffered from electrical breakdown upon exposure to electric pulses. In addition, extracellular Ca2+ (but not Mg2+) ions at more than micromolar concentrations were indispensable for the cell fusion.

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Authors and Affiliations

  1. Department of Physiology, Faculty of Medicine, Kyoto University, 606, Kyoto, Japan

    Takako Ohno-Shosaku & Yasunobu Okada

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  1. Takako Ohno-Shosaku
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  2. Yasunobu Okada
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Ohno-Shosaku, T., Okada, Y. Electric pulse-induced fusion of mouse lymphoma cells: Roles of divalent cations and membrane lipid domains. J. Membrain Biol. 85, 269–280 (1985). https://doi.org/10.1007/BF01871522

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  • DOI: https://doi.org/10.1007/BF01871522

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