[Effect of the permeability of lysosomal and mitochondrial membranes on the ability of their cryoextracts to inhibit the protein-synthesizing activity of cell-free systems].

Changes in permeability of lysosomal and mitochondrial membranes were studied under different temperatures at which cryoextracts from organelles inhibit most distinctly the protein synthesizing activity of the cell-free system from the rat liver. It is found that mitochondria are more sensitive to the effect of low temperature effect than lysosomes. Overcooling of the mitochondria suspension to the temperature of the free water crystallization is shown to cause no release of the protein synthesis inhibitor. The inhibitor release from organelles occurs from the moment of crystallization and reaches its maximum at the eutectic temperatures of the freezing medium which is due to the injury effect of the complex of physicochemical factors on the membrane structures, occurring during the phase transition of the solvent.