title: [Cation transport and content in serum-stimulated CHO-773 cells. I. Rapid changes in rubidium and lithium influxes and intracellular sodium content].
abstract: The cultures of Chinese hamster ovary cells (CHO-K1 clone 773) can be brought to the stationary state with most of cellular populations in G1 phase by growing continuously for 4 days up to the cultural density (10-12) X 10(4) cells/cm2. Upon introduction of fresh Eagle medium with 10% calf serum the cells progress from G1 to S phase for 7-9 hours. It is shown that within the first minutes of serum addition ouabain-sensitive rubidium influx increases, however, lithium influx, which serves a test for passive sodium pathways in the membrane, increases or does not change. No correlation was found between the rubidium influx and intracellular sodium changes, induced by serum. From comparative studies of ouabain-sensitive rubidium influx, lithium influx and intracellular sodium content it is concluded that the increase in intracellular sodium is not responsible for serum-induced Na,K-ATPase activation.
mesh_terms: D000818:Animals; D002460:Cell Line; D002478:Cells, Cultured; D003470:Culture Media / Q000494:pharmacology*; D007473:Ion Channels / Q000187:drug effects / Q000378:metabolism*; D008094:Lithium / Q000378:metabolism*; D012413:Rubidium / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism*; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism
chemical_list: D003470:Culture Media; D007473:Ion Channels; D008094:Lithium; D012964:Sodium; D000254:Sodium-Potassium-Exchanging ATPase; D012413:Rubidium
vernacular_title: Transport i soderzhanie kationov v kletkakh CHO-773, stimulirovannykh syvorotkoĭ. I. Bystrye izmeneniia vkhodnykh potokov rubidiia i litiia i vnutrikletochnoe soderzhanie natriia.