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. 1971 Dec;21(6):883–902.

Analysis of the biological activity of antilymphocyte serum

III. Concentration of immunosuppressive activity on one IgG subfraction and its inhibition by another

R J Perper, R E Monovich, T J Van Gorder
PMCID: PMC1408248  PMID: 4943146

Abstract

Two IgG subfractions of horse antilymphocyte serum (ALS) were obtained by DEAE Sephadex chromatography. Although the fractions did not differ antigenically, they differed on amino acid and carbohydrate analysis, and in electrophoretic mobility. As demonstrated by binding studies, only the most positively charged population of IgG molecules (fraction 1) obtained from anti-lymphocyte serum had specificity for the small lymphocyte; 50 per cent of the molecules in this population bound specifically to lymphocytes in vitro. As determined by an in vitro correlate of immunosuppressive potency (rosette inhibition), fraction 1 (F1) IgG from ALS contained approximately 4 times the specific activity of fraction 2 (F2). F1 was significantly more effective in prolonging skin graft survival than F2, whereas F2 contained the major component of the non-specific anti-inflammatory activity of serum. The anti-inflammatory effect was mediated by anticomplement activity.

F2 was found to be an effective inhibitor of the immunosuppressive activity of F1 both in vivo and in vitro. Quantitative studies indicated that 1 part of F2 could maximally inhibit 4 parts of F1. The percentage of F2 present in serum IgG was inversely related to the skin graft survival elicited by the serum, which indicated that F2 was active as an inhibitor when tested as purified fraction as well as in unfractionated serum. Following immunization when F1 gained immunosuppressive potency, it lost non-specific anti-inflammatory activity. These observations indicated that not only was there a quantitative, as well as a qualitative concentration of immunosuppressive antibodies in F1, but also that this activity was controlled by the concentration of F2. This report, therefore, describes an IgG control mechanism which can limit the expression of antibody induced biological activity.

It is suggested that in ALS the immunosuppressive antibody molecules possess a greater net positive charge than the remaining population, and that this is due to the degree of the negative charge on the immunizing antigen. Using DEAE Sephadex chromatography, these populations could be separated into two differently charged populations of molecules, only one of which had significant immunosuppressive capability. This increase in activity resulted from the increase of specific molecules, the loss of non-specific molecules, and was manifest upon the removal of an IgG inhibitor.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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