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Accumulation of sodium and potassium ions in oocytes of the river lamprey Lampetra fluviatilis at the prespawning period

  • Comparative and Ontogenic Biochemistry
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Abstract

Accumulation of Na+ and K+ ions in oocytes of the river lamprey Lampetra fluviatilis and their transport across the plasma membrane is realized by two main mechanisms-Na,K-pump and Na,K,Cl-cotransport. At the prespawning period from December to May, the intracellular Na+ concentration was observed to increase from 10 to 25 mM and the K+ concentration-from 28 to 45 mM. Results obtained on isolated oocytes with aid of radioactive labels 22Na and 204Tl have shown that contributions of the Na,K-pump and Na,K,Cl-cotransport to potassium accumulations were close until March. In spring, the total K+ inflow almost doubled owing to activation of the Na,K-pump, whereas contribution of Na,K,Cl-cotransport did not change. It seems that an increase of the intracellular content of the main inorganic cations in oocytes resulted in parallel activation of the Na,K-pump and probably of Na/H-exchange. The biological significance of activation of these mechanisms of ion transport at the prespawning period might be due to a necessity of accumulation of Na+ and K+ ions in concentrations optimal for subsequent embryonic development.

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Authors and Affiliations

  1. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, Russia

    A. O. Sherstobitov, A. V. Lapin, V. V. Glazunov, V. A. Nikiforov & A. A. Nikiforov

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  1. A. O. Sherstobitov
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  2. A. V. Lapin
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  3. V. V. Glazunov
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  4. V. A. Nikiforov
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  5. A. A. Nikiforov
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Original Russian Text © A. O. Sherstobitov, A. V. Lapin, V. V. Glazunov, V. A. Nikiforov, A. A. Nikiforov, 2011, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2011, Vol. 47, No. 4, pp. 278–281.

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Sherstobitov, A.O., Lapin, A.V., Glazunov, V.V. et al. Accumulation of sodium and potassium ions in oocytes of the river lamprey Lampetra fluviatilis at the prespawning period. J Evol Biochem Phys 47, 328–332 (2011). https://doi.org/10.1134/S0022093011040037

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  • DOI: https://doi.org/10.1134/S0022093011040037

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