Biomedical subjects

F J DIXON

Publications and source records attributed to F J DIXON.

At least 73 records · Page 4Linked to original sources

PubMed1956

Immunohistochemical analysis of amyloid by the fluorescence technique.

The immunohistochemical composition of amyloid deposits in secondary human amyloidosis and experimental amyloidosis in rabbits was studied by means of the "fluorescent antibody" technique of Coons et al. Quantitative studies of the relative amounts of gamma globulin present in the amyloid deposits by the use of radioiodinated fluorescent antibody are reported. It is concluded that amyloid deposits in several organs from cases of secondary human amyloidosis and experimental amyloidosis in rabbits contain considerable concentrations of gamma globulin. The presence of gamma globulin in amyloid might be interpreted as either a metabolic deposition of circulating globulin present in high concentrations in the plasma or as a result of an immunologic reaction involving antigen and antibody.

Amyloid↗

PubMed1956

Rates of antibody synthesis during first, second, and hyperimmune responses of rabbits to bovine gamma globulin.

Determinations of the rates of antibody synthesis during first, second, and hyperimmune responses to bovine gamma globulin using S(35)-labelle aminod acids indicate the following: 1. In all three responses the rate of antibody synthesis increases while antigen is circulating and then begins to decline rapidly after elimination of detectable circulating antigen. 2. The initial rates of decline of antibody synthesis are approximately the same for all three responses. 3. There is a relatively persistent source of antibody production which appears after repeated stimulation and increases in proportion to the number of repeated stimuli.

Animals↗

PubMed1955

The transfer of lymph node cells in the study of the immune response to foreign proteins.

A secondary immune response to the soluble foreign protein antigens I*BSA and I*BGG has been demonstrated when lymph node cells, largely lymphocytes with a few reticulo-endothelial and plasma cells, from previously immunized rabbits were transferred to x-radiated recipient rabbits, and the recipients then challenged with antigen. The total specific antibody synthesized by the transferred cells during the first 8 days of the secondary response amounted to approximately (2/3) of the wet weight of the transferred cells. In an attempt to elicit a primary response, lymph node cells were obtained from normal, non-immunized donors, and transferred to x-radiated recipients. No immune response was observed upon antigenic stimulation. When normal or previously immunized lymph node cells were incubated with antigen for periods up to 1 hour, washed and injected into recipients, no antibody production was observed.

Antibodies↗

PubMed1955

Effects of large infusions of heterologous serum proteins on the serum protein metabolism of rabbits.

Infusions of heterologous serum proteins large enough to replace the entire normal catabolic loss of the corresponding autologous proteins in the recipient rabbits caused increased rates of plasma protein catabolism, an increase in the size of the plasma protein pool and normal or even slightly increased rates of plasma protein synthesis. The principal proteins in these infusions were catabolized at rates similar to those for corresponding homologous proteins. The most marked hyperproteinemias which developed were caused principally by increases in the host's own globulin and to a lesser extent by the presence of foreign protein in the circulation.

Animals↗

PubMed1955

Immunologic unresponsiveness induced by protein antigens.

1. Repeated large infusions of heterologous plasma proteins can induce a state of specific immunologic unresponsiveness in rabbits. In normal adult rabbits this unresponsiveness in most instances lasts only about as long as the heterologous proteins are detectable in the host (3 to 4 months). In rabbits infused from the time of birth and perhaps x-radiated adult rabbits the induced immunologic unresponsiveness lasted throughout the period of observation (10 to 11 months), long after disappearance of all detectable foreign proteins. 2. This unresponsiveness appears to be specific for the antigens administered in excess and does not prevent antibody responses to even closely related antigens. 3. The unresponsiveness was not transmitted to first generation offspring. 4. The mechanism of the temporary unresponsiveness which occurs in normal adult rabbits may be dependent upon the actual presence of the antigen in the host. However, the unresponsiveness does not result from a simple neutralization of antibody, as it is formed, by the antigen, as has been suggested in the case of pneumococcal polysaccharide induced immunologic paralysis. 5. On the other hand, the mechanism of the lasting immunologic unresponsiveness developing in the "newborn" and perhaps the x-rayed rabbits may depend upon the acceptance of the foreign protein as essentially non-antigenic by the host. A similar situation is seen in the naturally occurring placental transfer of dissimilar red blood cell types between fraternal twins.

Animals↗

PubMed1955