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Is adenosine a second metabolic substrate for human red blood cells?
1Department of Pharmacology, University of Missouri-Columbia 65212.
Biochimica Et Biophysica Acta
|November 9, 1990
Summary
Plasma adenosine significantly impacts human red blood cell energy production. Higher adenosine levels increase lactate production and ATP levels, even surpassing glucose metabolism at certain concentrations.
Area of Science:
- Red blood cell metabolism
- Bioenergetics
- Human physiology
Background:
- Adenosine is present in human plasma at micromolar concentrations.
- Understanding adenosine's role in red blood cell energetics is crucial.
Purpose of the Study:
- To investigate the metabolic effects of adenosine in human red blood cells.
- To determine how adenosine concentration influences lactate and ATP production.
Main Methods:
- Continuous infusion of adenosine into human red blood cells at varying concentrations.
- Measurement of lactate production and ATP content.
- Investigation of interactions between adenosine, glucose, and inorganic phosphate.
Main Results:
- Lactate production increased linearly with adenosine concentration.
- Adenosine at 1.5 microM fully maintained ATP levels, with higher concentrations leading to net ATP synthesis.
- Adenosine and glucose interactions on metabolism were dependent on inorganic phosphate levels.
Conclusions:
- Plasma adenosine plays a significant role in human red blood cell energetics.
- Adenosine can contribute to ATP production and influence glucose metabolism in red blood cells.