Regeneration of Cation-Transport Capacity in HeLa Cell Membranes After Specific Blockade by Ouabain
AUTOR(ES)
Vaughan, Gerald L.
RESUMO
The cardiac glycoside, ouabain, inhibits alkali-cation transport in HeLa cells. It binds to 0.75 × 106 sites per cell, and the half-time for its dissociation is 16 hr. After partial blockade by ouabain, the cell generates new ouabain-binding sites, with total restoration of transport in 10% of a cell cycle(∼3 hr). This recovery requires protein synthesis and appears to be a response to altered cell-electrolyte content, since growth of cells in media with low K+ concentration enhances the titer of the transport enzyme in a fashion similar to the effect of ouabain. Totally blocked cells do not recover.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=427003Documentos Relacionados
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