Reconstruction of intact gamma-globulin from S-sulfonated gamma-globulin in vivo.

The conversion of the S-surfonate group in a peptide to a disulfide bond has been observed in vitro. This paper reports that the conversion of this group in human S-sulfonated gamma-globulin (S-GG) appeared to occur in vivo judging from the change in molecular weight of S-GG observed in the presence of sodium dodecyl sulfate (SDS) and the restoration of hemolytic activity.     

Depression of prolylendopeptidase activity in the delayed hypersensitive guinea pig skin lesion induced by bovine gamma-globulin

Prolylendopeptidase activity was increasingly depressed with time from 6 to 24 hr after the start of sensitization in the delayed hypersensitive guinea pig skin lesion induced by bovine gamma-globulin as an antigen. The remarkably depressed activity of the enzyme in the violently inflamed skin began to be restored slowly 48 hr after sensitization, and its activity was ultimately recovered to the original level by 504 hr after a single sensitization in vivo. Depression of the enzymatic activity is caused by a novel prolyendopeptidase inhibitor, whose amino acid composition is 7 Glu, 1 Ser, 2 Gly, 1 Ala, 2 Pro, and 1 Val, generated by inflammation.     

Mechanism of the effect of sera from rats subjected to high external temperature on rosette formation by splenic lymphocytes from non-immune animals]

Serum of rats subjected to the action of moderately high external temperature increased the immunogenicity of heterologous erythrocytes, but became inactive at a temperature of 2 degrees C and after the treatment with a polyvalent proteinase inhibitor--trasilol. Incubation of sheep erythrocytes with the serum of heated rats intensified the reaction of rosette formation by the lymphocytes of the spleen of intact rats. Incubation of the spleen cells with the sera of intact and heated rats failed to influence the rosette formation. After trasilol treatment the serum of heated rats completely lost the property to intensify the reaction of rosette formation. Phenomenon of intensification of rosette formation was revealed in case of treatment of erythrocytes with the sera at a temperature of 37 degrees C and was not reproduced at a temperature of 2 degrees C. Investigations carried out indicated that the increase in the immunogenicity of sheep erythrocytes and the intensification of their binding with the lymphocyte receptors of intact rats under the effect of the serum of heated animals were caused by the action of the same factor.