Mechanical stretching of alveolar epithelial cells increases Na+-K+- ATPase activity

Christopher M. Waters*, Karen M. Ridge, G. Sunio, K. Venetsanou, Jacob Iasha Sznajder

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

Alveolar epithelial cells effect edema clearance by transporting Na+ and liquid out of the air spaces. Active Na+ transport by the basolaterally located Na+-K+-ATPase is an important contributor to lung edema clearance. Because alveoli undergo cyclic stretch in vivo, we investigated the role of cyclic stretch in the regulation of Na+-K+-ATPase activity in alveolar epithelial cells. Using the Flexercell Strain Unit, we exposed a cell line of murine lung epithelial cells (MLE-12) to cyclic stretch (30 cycles/min). After 15 min of stretch (10% mean strain), there was no change in Na+-K+- ATPase activity, as assessed by 86Rb+ uptake. By 30 min and after 60 min, Na+-K+-ATPase activity was significantly increased. When cells were treated with amiloride to block amiloride-sensitive Na+ entry into cells or when cells were treated with gadolinium to block stretch-activated, nonselective cation channels, there was no stimulation of Na+-K+-ATPase activity by cyclic stretch. Conversely, cells exposed to Nystatin, which increases Na+ entry into cells, demonstrated increased Na+K+ATPase activity. The changes in Na+-K+-ATPase activity were paralleled by increased Na+-K+-ATPase protein in the basolateral membrane of MLE-12 cells. Thus, in MLE-12 cells, short-term cyclic stretch stimulates Na+-K+-ATPase activity, most likely by increasing intracellular Na+ and by recruitment of Na+-K+-ATPase subunits from intracellular pools to the basolateral membrane.

Original languageEnglish (US)
Pages (from-to)715-721
Number of pages7
JournalJournal of applied physiology
Volume87
Issue number2
DOIs
StatePublished - 1999

Keywords

  • Amiloride
  • Gadolinium
  • Mechanical ventilation
  • Nystatin
  • Pulmonary edema
  • Sodium transport
  • Sodium-potassium-adenosine 5'-triphosphatase

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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