By G. J. V. Nossal
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Extra info for Antigens, Lymphoid Cells and the Immune Response
1968) have listed the half-fife in the plasma of rabbits of a series of plasma proteins (and their derivatives), having molecular weights of 50,000 to 950,000 and which had been labeled with " ^ I or ^251 and injected intravenously. 4 days for humans ^ic-globulin to 6 days for rabbit 7 S yG-globulin. These authors were concerned primarily in investigating the factors responsible for the distribution of plasma proteins between intra- and extravascular compartments. As expected, the amount of plasma protein in the extravascular space after equilibration correlated exponentially with the effective hydrodynamic diffusion radius of the plasma protein.
2 ) Could it be shown that the attached iodide was associated with an antigenic determinant of the protein? ( 3 ) Did deiodination of the protein occur in vivo and if so, was the hberated iodide reutilized? Many workers have studied the eflFects of iodination on the properties of proteins (frequently serum proteins) as revealed either by the be havior of the iodinated protein in serological tests or by the survival of the protein in the blood after intravenous injection. Provided the extent of substitution of the protein was about 1 gm atom of iodide per 30,000 gm of protein or less, it was generally found that the prop erties of the protein were unchanged.
These authors were concerned primarily in investigating the factors responsible for the distribution of plasma proteins between intra- and extravascular compartments. As expected, the amount of plasma protein in the extravascular space after equilibration correlated exponentially with the effective hydrodynamic diffusion radius of the plasma protein. The extravascular space itself appeared to be hetero geneous, some compartments accepting only small proteins. The authors placed considerable emphasis on this study as they considered that im munological phenomena may well depend upon the concentration of the substance in the extravascular space.
Antigens, Lymphoid Cells and the Immune Response by G. J. V. Nossal