The Journal of Membrane Biology

, Volume 124, Issue 3, pp 285–291 | Cite as

Cation transport in vascular endothelial cells and aging

  • N. C. Adragna


To understand the generation and maintenance of Na and K gradients in cultured vascular endothelial cells, net Na and K movements were studied. Ouabain-sensitive (OS) net Na gain and K loss were estimated as the difference between the cation content in the presence of ouabain and that in the control. Ouabain-and furosemide-resistant (OFR) fluxes were determined in the presence of the two inhibitors. When the normal medium bicarbonate and phosphate buffers were replaced by N-2-hydroxyethylpiperazine-N'-2-ethane sulfonic acid both the OS ans OFR fluxes decreased more than 50%. Ouabain-sensitive and ouabain-and furosemide-resistant fluxes decreased with increasing cellular age (passage number) an effect not observed when the cation movements were studied in the absence of bicarbonate and phosphate. These results suggest that cultured vascular endothelial cells possess bicarbonate-and phosphate-dependent Na and K pathways which account for a significant portion of their passive movements. Furthermore, the behavior of cation permeabilities with passage number suggests that these modulations may be related to the cellular aging process.

Key Words

endothelium ion transport net fluxes aging bicaroonate phosphate 


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Copyright information

© Springer-Verlag New York Inc. 1991

Authors and Affiliations

  • N. C. Adragna
    • 1
  1. 1.Department of Pharmacology and ToxicologyWright State University, School of MedicineDayton

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