title: [Accumulation of sodium and potassium ions in oocytes of the river lamprey Lampetra fluviatilis during prespawning period].
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 204Tl radioactive label 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.
authors.forename: A O
authors.initials: AO
authors.lastname: Sherstobitov
authors.forename: A V
authors.initials: AV
authors.lastname: Lapin
authors.forename: V V
authors.initials: VV
authors.lastname: Glazunov
authors.forename: V A
authors.initials: VA
authors.lastname: Nikiforov
authors.forename: A A
authors.initials: AA
authors.lastname: Nikiforov
mesh_terms: D000818:Animals; D001693:Biological Transport, Active; D002462:Cell Membrane / Q000378:metabolism; D005260:Female; D017136:Ion Transport; D007798:Lampreys / Q000378:metabolism* / Q000502:physiology; D009865:Oocytes / Q000201:enzymology / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D012098:Reproduction / Q000502:physiology; D045483:Rivers; D012621:Seasons; D012964:Sodium / Q000378:metabolism*; D028021:Sodium-Potassium-Chloride Symporters / Q000378:metabolism; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism; D013794:Thallium Radioisotopes
chemical_list: D028021:Sodium-Potassium-Chloride Symporters; D013794:Thallium Radioisotopes; D012964:Sodium; D000254:Sodium-Potassium-Exchanging ATPase; D011188:Potassium