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Phosphate uptake into organic compounds in skeletal muscle
Canadian Journal of Physiology and Pharmacology
|April 1, 1975
Summary
Frog muscles rapidly incorporate 32-P from Ringer's solution into organic phosphate compounds like adenosine triphosphate (ATP) within seconds. This indicates immediate phosphate esterification occurs at the muscle cell surface (sarcolemma).
Area of Science:
- Muscle physiology
- Cellular metabolism
- Biochemistry
Background:
- Understanding phosphate metabolism in muscle is crucial for cellular energy.
- The sarcolemma's role in initial phosphate uptake and esterification requires detailed investigation.
Purpose of the Study:
- To investigate the kinetics of 32-P incorporation into phosphate compounds in isolated frog muscles.
- To determine the site of initial inorganic phosphate (Pi) esterification in muscle cells.
Main Methods:
- Isolated frog muscles were incubated with 32-P-labeled Ringer's solution for varying durations (30 seconds to 20 hours).
- Radioactive compounds were extracted using TCA, methanol-chloroform-water, and water.
- Identified phosphorylated compounds using chromatographic and radiochemical techniques.
Main Results:
- Hexosephosphates, phosphocreatine, phosphoenolpyruvate, alpha-glycerol phosphate, adenosine triphosphate (ATP), and inorganic phosphate were identified after 30 seconds and 4 hours.
- Significantly higher levels of 32-P labeling were observed after 20 hours of incubation.
- Rapid 32-P incorporation into alpha-glycerol phosphate and ATP within 30 seconds demonstrated immediate Pi esterification.
Conclusions:
- Immediate esterification of inorganic phosphate (Pi) occurs at or just inside the sarcolemma.
- Frog muscle exhibits rapid initial phosphate compound synthesis, highlighting the sarcolemma's active role in phosphate metabolism.