Synthesis and apparent secretion of prothymosin alpha by different subpopulations of calf and rat thymocytes.
Franco. F J FJ; Diaz. C C; Barcia. M M; Arias. P P; Gomez-Marquez. J J; Soriano. F F; Mendez. E E; Freire. M M
Key Findings
- Prothymosin alpha contains the thymosin‑alpha‑1 sequence and is present in calf thymus at levels similar to the whole gland
- Large thymocytes produce most of the prothymosin alpha, while small ones produce less
- Both calf and rat thymocyte groups secrete about 80‑90% of the newly made prothymosin alpha into the surrounding medium
Practical Outcomes
- For biohackers, this study shows that the thymus naturally creates a precursor of thymosin‑alpha‑1, but it offers no direct guidance on dosing, supplementation, or human effects. It’s mainly basic science, so it doesn’t change current DIY protocols.
Summary
Scientists found that a protein called prothymosin alpha, which includes the short peptide thymosin‑alpha‑1 at its start, is naturally made and released by thymus cells in calves and rats. Bigger thymus cells make more of it, but all cell types release similar amounts.
Abstract
Prothymosin alpha (ProT alpha), a polypeptide containing the sequence of thymosin alpha 1 (T alpha 1) at its NH2-terminus, has been isolated from calf thymocytes in a concentration in the order of that found in the whole thymic gland. As deduced from the analysis of their tryptic peptides, calf ProT alpha differs from the rat polypeptide at least in an alanine residue replacing valine at position 92. Thymocytes cultured in a radioactive medium exhibit an important secretory activity, ProT alpha being one of the products synthesized and exported to the culture medium. Large and small thymocyte subpopulations from calf and rat differ in their capacity to synthesize ProT alpha. The polypeptide is produced in a major concentration by large thymocytes. However, all the calf and rat thymocyte subpopulations show a similar capacity to secrete ProT alpha, the amount of the newly synthesized polypeptide recovered from cell culture supernatants being 80-90% of that found in thymocyte extracts.
Study Information
pubmed
1989