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Further evidence for ATP uptake by rat tissues
Biochimica Et Biophysica Acta
|March 20, 1980
Summary
This study demonstrates that intact muscle tissues can uptake adenosine triphosphate (ATP). The findings suggest ATP transport into cells may involve a carrier-mediated process.
Area of Science:
- Biochemistry
- Cell Physiology
Background:
- Adenosine triphosphate (ATP) is the primary energy currency of cells.
- Understanding ATP transport mechanisms is crucial for cellular energy metabolism research.
Purpose of the Study:
- To investigate the intracellular uptake of exogenous ATP in intact skeletal muscle tissues.
- To explore the kinetics and potential mechanisms of ATP transport into muscle cells.
Main Methods:
- Incubation of rat soleus muscles and hemidiaphragms with radiolabeled ATP (14C and 32P).
- Electrophoretic separation of incubation medium and tissue extracts.
- Quantification of radioactivity to determine ATP concentrations and degradation.
Main Results:
- Significant degradation of exogenous ATP was observed in the presence of muscle tissues.
- Intracellular concentrations of labeled ATP confirmed uptake into soleus and diaphragm cells.
- ATP uptake exhibited saturation kinetics at higher external ATP concentrations, indicating a carrier-mediated process.
Conclusions:
- Intact muscle tissues are capable of intracellular uptake of exogenous ATP.
- ATP transport into muscle cells appears to be a carrier-mediated process.
- This study provides evidence supporting a novel mechanism for cellular energy supply.