Deacetyl-Thymosin α₁ : Synthesis and Immunological Effect on Lipoid Nephrosis Lymphocytes

抄録

We have replaced the Ac-Ser residue of bovine thymosin α₁ (position 1) with Ser in order to examine the resulting change in immunological effect on the low resette-forming capacity with sheep erythrocytes of cells from a lipoid nephrosis patient. The deacetyl-thymosin α₁ was synthesized by the solution method. For the synthesis of the protected octaeicosapeptide, five peptide fragments were prepared by the stepwise elongation method with N-ethoxycarbonyl-2-ethoxy-1, 2-dihydroquinoline as a coupling reagent. The condensations of the fragments were achieved by Rudinger's azide procedure. Finally, all protecting groups were removed by HF treatment followed by catalytic hydrogenation. The in vitro addition of the synthetic deacetyl-thymosin α₁ at a dose of 100 μg/ml was able to restore the rosette-forming capaoity with sheep erythrocytes of lipoid nephrosis cells to normal levels. Our preparations of deacetyl-thymosin α₁ and thymosin α₁ were found to be equally active in cases of lipoid nephrosis.