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Related Experiment Videos

Developmental differences in rabbit lung epithelial cell Na(+)-K(+)-ATPase.

D L Chapman1, J H Widdicombe, R D Bland

  • 1Department of Pediatrics, University of California, San Francisco 94143.

The American Journal of Physiology
|December 1, 1990
PubMed
Summary
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Rabbit lung epithelial cells show increased sodium-potassium adenosine triphosphatase (ATPase) activity after birth. This involves both increased pump turnover at birth and increased pump number postnatally.

Area of Science:

  • Physiology
  • Cell Biology
  • Biochemistry

Background:

  • Ouabain-sensitive rubidium (86Rb+) uptake in rabbit lung epithelial cells increases significantly from fetal to adult stages.
  • Understanding the mechanisms behind this developmental increase in cation transport is crucial for respiratory health.

Purpose of the Study:

  • To investigate whether changes in Na(+)-K(+)-adenosinetriphosphatase (ATPase) number or turnover rate explain the developmental increase in ouabain-sensitive cation transport in rabbit lung epithelial cells.

Main Methods:

  • Measurement of [3H]ouabain binding to determine Na(+)-K(+)-ATPase sites (Umax).
  • Quantification of ouabain-sensitive 86Rb+ uptake in freshly isolated lung epithelial cells from fetal, newborn, and adult rabbits.
  • Calculation of Na(+)-K(+)-ATPase turnover rate using uptake and Umax data.

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Main Results:

  • Ouabain-sensitive 86Rb+ uptake was significantly lower in fetal cells compared to newborn and adult cells.
  • The maximal number of ouabain binding sites (Umax) was similar in fetal and newborn cells but threefold higher in adult cells.
  • Na(+)-K(+)-ATPase turnover rate was four times greater in newborn and adult cells than in fetal cells.

Conclusions:

  • The increase in 86Rb+ uptake at birth is attributed to an elevated Na(+)-K(+)-ATPase turnover rate.
  • The subsequent postnatal increase in 86Rb+ uptake is explained by an increase in the cellular amount of Na(+)-K(+)-ATPase.