Incorporation of labeled amino acids into proteins of the cell organelles of muscle tissue during the restoration of the regenerative capacity of the limbs of axolotl, suppressed by x-irradiation.

The incorporation of labeled amino acids into the total proteins of muscle tissue and cell organelles during the regeneration of limbs of axolotls and after the suppression of the regenerative capacity by x-irradiation and its experimental restoration were investigated. In the case of suppression of the regenerative capacity of the limbs by x-irradiation, the protein synthesis in the muscle tissue is impaired. The intensity of the incorporation of labeled amino acids into the proteins of a homogenate of muscle tissue, nuclei, mitochondria, and the mitochondria-free fraction is reduced in comparison with normal regeneration. Under the influence of biopreparations (a salt extract from a homogenate of the rat gastrocnemius muscle), a restoration of protein synthesis, processes of differentiation, and the formation of regenerates was observed. C-14-lysine was incorporated most intensively into the proteins of the mitochondria-free fraction and nuclei at the spatula stage (exceeding this index in the series with irradiation of the limbs without treatment with the biopreparation by 5 and 7-fold, respectively).