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Biomarker: p70S6K (pT389)

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p70S6K (pT389)

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Experienced Running

Biological or Clinical Significance:

p70S6 kinase or p70S6K is a serine/threonine kinase that acts downstream of PIP3 and phosphoinositide-dependent kinase-1 in the PI3 kinase pathway. As the name suggests, its target substrate is the S6 ribosomal protein. Phosphorylation of S6 induces protein synthesis at the ribosome. Physical exercise activates protein synthesis via phosphorylation (activation) of p70S6K in a pathway that is dependent on mTOR.
The phosphorylation of P70S6K at threonine 389 has been used as a hallmark of activation by mTOR and correlated with autophagy inhibition in various situations. However, several recent studies suggest that the activity of P70S6K plays a more positive role in the increase of autophagy.

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