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TB-500 is a synthetic analog of the Thymosin Beta-4 protein fragment (CAS 77591-33-4), a 43-amino acid peptide found at high concentrations in platelets, wound fluid, and virtually all human and animal cells
Of particular relevance to IGF-1 anabolic research are TSC2 (relieving inhibition of mTORC1, driving protein synthesis) and FoxO transcription factors (inhibiting their nuclear translocation, blocking expression of atrogenes like MuRF1 and atrogin-1 that drive muscle protein breakdown)
Both peptides have short plasma half-lives estimated in the tens of minutes range for subcutaneous administration, which is why they produce a pulsatile GH spike rather than sustained elevation
(2006a)
The key role of the WNT/-catenin pathway in metabolic reprogramming in cancers under normoxic conditions
