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Biomedical subjects

D H CAMPBELL

Publications and source records attributed to D H CAMPBELL.

At least 19 recordsLinked to original sources
PubMed1959

The in vivo stability of antibody.

When rabbits were fed S(35)-labelled amino acids and simultaneously injected with antigen at the peak of antibody production, the circulating antibody became rapidly labelled within a few hours with the isotope. The specific radioactivity of antibody was measured as antibody was allowed to decline in the absence of antigenic stimulation. At various times, in different animals, antigen was reinjected and circulating antibody was measured for specific radioactivity. The initial antibody which appeared after the antigenic stimulus always had a higher specific activity than antibody circulating just prior to the reinjection. The appearance of antibody of higher specific activity was demonstrated to be a specific response to the antigen which was reinjected. It was concluded that there is a reservoir of antibody which is stabilized in tissue and which is not in equilibrium with that in circulation. A mechanism for this stabilization is suggested and discussed from previous investigations demonstrating the long retention of antigen in liver tissue.

Animals↗
PubMed1959

The biological activity of soluble antigen-antibody complexes. II. Physical properties of soluble complexes having skin-irritating activity.

Soluble BSA-anti-BSA complexes, formed in antigen excess, give immediate skin reactions in normal guinea pigs. The mechanism of the reaction is not that of passive or reversed passive anaphylaxis. The complex itself is toxic. Skin activity of the complex depends on its composition. It has become obvious that the complex composed of two antigen molecules and one antibody molecule, (Ag(2)Ab), does not have the activity, whereas, Ag(3)Ab(2) and more complicated complexes do. The role of complement as well as speculation on the structural changes of antibody-antigen complexes is presented.

Animals↗