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Ouabain-resistant, amiloride-sensitive Na+-K+ pumping activity and morphological changes are inducible
1Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115.
The American Journal of Physiology
|June 1, 1988
Summary
A single gene controls the sensitivity of the sodium-potassium pump (Na+-K+ pump) to ouabain and amiloride in OR-6 cells. This gene also influences cell shape and is inducible by ouabain.
Area of Science:
- Cell Biology
- Molecular Genetics
- Biochemistry
Background:
- OR-6 cells exhibit a ouabain-inhibitable, amiloride-resistant Na+-K+ pump.
- The Na+-K+ pump is crucial for maintaining cellular homeostasis.
Purpose of the Study:
- To investigate the functional expression of a ouabain-resistance gene in OR-6 cells.
- To understand the regulation of Na+-K+ pump activity and its link to cellular morphology.
Main Methods:
- Utilized a transfected cell line (OR-6 cells).
- Induction of gene expression using low concentrations of ouabain.
- Cultured cells in specific media (low-potassium, low-serum, cyclic AMP).
Main Results:
- A single inducible gene regulates ouabain and amiloride sensitivity of the Na+-K+ pump.
- Gene expression is reversible upon ouabain removal.
- Induction leads to a ouabain-resistant, amiloride-sensitive Na+-K+ pumping activity.
- Cells exhibit altered morphology, producing long cellular extensions under specific conditions.
Conclusions:
- The studied gene plays a dual role in regulating ion pump sensitivity and cellular morphology.
- This inducible gene offers a model for studying ion transport regulation and cell shape changes.