How insulin helps muscles grab more creatine
Role of Serine/Threonine Protein Phosphatases in Insulin Regulation of Na+/K+-ATPase Activity in Cultured Rat Skeletal Muscle Cells*
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Low-dose okadaic acid (which blocks PP-2A) had no effect on insulin’s activation of the pump.
Many assume multiple phosphatases back up key cellular functions—this shows PP-2A is completely irrelevant here, making PP-1 the sole gatekeeper.
Practical Takeaways
Timing creatine intake with insulin-spiking meals (e.g., carbs + protein) might enhance muscle uptake.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Low-dose okadaic acid (which blocks PP-2A) had no effect on insulin’s activation of the pump.
Many assume multiple phosphatases back up key cellular functions—this shows PP-2A is completely irrelevant here, making PP-1 the sole gatekeeper.
Practical Takeaways
Timing creatine intake with insulin-spiking meals (e.g., carbs + protein) might enhance muscle uptake.
Publication
Journal
The Journal of Biological Chemistry
Year
1997
Authors
L. Ragolia, Basil Cherpalis, M. Srinivasan, N. Begum
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Claims (6)
When insulin is present, it tells muscle cells to pump more sodium and potassium around, which creates a better environment for the cell to pull in more creatine — a compound that helps muscles store energy.
When insulin is present in rat muscle cells, it makes a special pump work harder to move salt in and out of the cells—but if you block certain cleanup enzymes in the cell, the pump doesn’t speed up anymore, which suggests insulin uses those enzymes to turn the pump on.
When scientists make rat muscle cells produce more of a specific protein called PP-1G, the cells respond to insulin more strongly—boosting both the activity of a key enzyme and the pump that moves salt in and out of the cell.
When scientists block a specific enzyme in rat muscle cells using a chemical called wortmannin, it stops insulin from making a pump (Na+/K+-ATPase) work better — like turning off a switch that normally helps the pump get activated.
When insulin is added to rat muscle cells, it turns down a specific molecular switch (phosphorylation) by 60%, but if you add calyculin A, that switch stays on—though a weaker chemical called low-dose okadaic acid doesn’t stop it.