Abstract
Experiments were carried out to determine the effect of a range of adjuvants on the antibody response of sheep to a subcutaneous injection of ovalbumin. Incomplete Freund's adjuvant (IFA) was the best of the repository type adjuvants. From a range of soluble immunopotentiating substances tested, the polyion DEAE-dextran, or dextran sulphate, produced the greatest enhancement of the response. These results were confirmed in a factorial experiment, but no interactions were found between various classes of adjuvants. Further experiments were carried out to determine the effect of superior adjuvants, prior immunization or intradermal injection on the rate and mode of uptake of antigen from the injection site to afferent lymph. These experiments showed that, with IFA, most antigen is retained at the injection site, less than 15% entering lymph by 3 days. There was some delay in antigen uptake with adjuvant 65, while for aluminium phosphate precipitated antigen, the rate of uptake was the same as following a saline injection. There was some delay in uptake of antigen following injection with DEAE-dextran or in primed sheep but, following intradermal injection, the rate of uptake into lymph was the same as aqueous antigen injected subcutaneously. Experiments in which the distribution of radioactive antigen between cells and plasma in lymph was examined showed that, in unprimed sheep, virtually all antigen is unassociated with cells. In primed sheep, however, about 0.5% of antigen in lymph was found to be cell-associated. Gel filtration of lymph plasma from primed sheep demonstrated that nearly all the antigen in lymph is carried to the node as high molecular weight material, presumably antigen-antibody complexes.
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Selected References
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