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Endogenous "ouabain-like" activity in bovine plasma.
Biochemical and Biophysical Research Communications
|February 26, 1986
Summary
Researchers isolated an endogenous inhibitor of the sodium pump from bovine plasma. This substance specifically inhibits Na,K-ATPase, offering insights into sodium pump regulation.
Area of Science:
- Biochemistry
- Physiology
- Pharmacology
Background:
- The sodium pump (Na+, K+-ATPase) is crucial for cellular function.
- Endogenous regulators of the sodium pump are not fully understood.
Purpose of the Study:
- To detect and purify an endogenous inhibitor of the sodium pump from bovine plasma.
- To characterize the inhibitory activity of the purified substance.
Main Methods:
- Purification involved deproteinization, solvent extraction, lipid removal, desalting, C18 cartridge adsorption, and HPLC.
- Inhibitory activity was assessed by 3H-ouabain displacement from synaptosomes and Na,K-ATPase inhibition assays.
Main Results:
- An inhibitor was concentrated 1000-fold from bovine plasma.
- The purified material inhibited red cell membrane Na,K-ATPase but not Mg-ATPase or Ca,Mg-ATPase.
- The inhibitor displaced 3H-ouabain from brain synaptosomes.
Conclusions:
- A specific endogenous inhibitor of the sodium pump was isolated and partially purified.
- The purification methods developed allow for further characterization of this inhibitor.
- Boiling plasma for deproteinization may introduce non-specific inhibitors.