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Effect of dephosphorylated 2′,5′-trioligoadenylate on the entry of sodium ions into human neuroblastoma cells

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Abstract

Using a radioisotope technique, we studied the effect of dephosphorylated 2′,5′-trioligoadenylate (2′,5′ ApApA) on the entry of sodium ions into cultured human neuroblastoma cells (IMR 32 strain). Short-term (nearly 1 h) action of 2′,5′ ApApA did not influence the entry of sodium ions through voltage-operated sodium channels in the absence of neurotoxins modulating the characteristics of these channels (toxin of a scorpion, Leiurus quinquestriatus, + veratrine). At the same time, 2′,5′ ApApA weakened in a dose-dependent manner the entry of sodium ions through sodium channels opened upon the action of the above neurotoxins. In cells cultured for 22 h in a medium containing 5 · 10−6 M 2′,5′ ApApA, the entry of sodium ions in the absence of neurotoxins was 25% greater, while in the presence of neurotoxins it was 24% smaller than that in the control cells. Tetrodotoxin (TTX, 4 · 10−7 M) blocked completely sodium entry through sodium channels in cells cultured in the absence of 2′,5′ ApApA, while in cells cultured in the presence of this adenylate TTX decreased the entry by 64%. It is hypothesized that long-lasting action of 2′,5′ ApApA results in the appearance of voltage-operated TTX-insensitive sodium channels in the plasma membrane of IMR 32 cells. Our data show that 2′,5′ ApApA is capable of modulating to a considerable extent the functioning of mechanisms controlling transport of sodium ions in cells of human neuroblastoma cells of the IMR 32 strain.

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Authors and Affiliations

  1. Bogomolets Institute of Physiology, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    O. M. Rozhmanova, E. V. Dolgaya, N. Kh. Pogorelaya & I. S. Magura

  2. Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    Z. Yu. Tkachouk

  3. Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Republic of Belarus

    I. A. Mikhailopulo

Authors
  1. O. M. Rozhmanova
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  2. E. V. Dolgaya
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  3. N. Kh. Pogorelaya
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  4. I. S. Magura
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  5. Z. Yu. Tkachouk
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  6. I. A. Mikhailopulo
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Correspondence to E. V. Dolgaya.

Additional information

Neirofiziologiya/Neurophysiology, Vol. 40, No. 1, pp. 3–8, January–February, 2008.

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Rozhmanova, O.M., Dolgaya, E.V., Pogorelaya, N.K. et al. Effect of dephosphorylated 2′,5′-trioligoadenylate on the entry of sodium ions into human neuroblastoma cells. Neurophysiology 40, 1–5 (2008). https://doi.org/10.1007/s11062-008-9012-9

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  • DOI: https://doi.org/10.1007/s11062-008-9012-9

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