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. 1986 Apr;6(4):1164–1171. doi: 10.1128/mcb.6.4.1164

Stable gene amplification and overexpression of sodium- and potassium-activated ATPase in HeLa cells.

P G Pauw, M D Johnson, P Moore, M Morgan, R M Fineman, T Kalka, J F Ash
PMCID: PMC367628  PMID: 3023874

Abstract

Cell lines stably resistant to ouabain were isolated from an unstably resistant HeLa line after growth in nonselective medium. Stable resistant lines bound ouabain at levels 10-fold higher than did HeLa cells and at similar levels to those bound by the unstable C+ line previously described (J. F. Ash, R. M. Fineman, T. Kalka, M. Morgan, and B. Wire, J. Cell Biol. 99: 971-983). Expression and synthesis of the Na+, K+ -ATPase alpha chain showed a similar amplification over that for HeLa cells by Western blots and [35S]methionine pulse-labeling. In addition, a glycoprotein labeled with [3H]fucose and comigrating with the Na+, K+ -ATPase beta chain was eight- to ninefold amplified in stably resistant lines. Dot blots with a cDNA clone specific for Na+, K+ -ATPase alpha chain gene sequences confirmed the amplification of this gene. Karyotyping suggested that the amplification is associated with an expanded, abnormal banded region on the long (q) arm of one chromosome 17.

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