Abstract
Intraperitoneal immunization of Hooded Lister rats with a soluble antigen such as bee venom phospholipase A2 (PLA2), or ovalbumin (OVA) together with the toxic lectin, ricin, eliminates a population of early-activated CD8+ T cells which regulate IgE production. These early-activated CD8+ T cells are eliminated because they bear increased ricin-binding glycoproteins on their surface. This immunization regimen produces a vigorous and long-lived IgE response. The effect of this treatment on the capacity of splenic T cells to secrete interferon-gamma (IFN-gamma), interleukin-2 (IL-2) and to generate IL-4 RNA message was assessed. IFN-gamma production by phytohaemagglutinin (PHA)- or ionomycin and phorbol myristate acetate (PMA)-stimulated splenocytes or purified splenic T cells from animals immunized with antigen and ricin was substantially reduced as compared with animals which were given saline or antigen alone (P < 0.001 Student's t-test). At the height of the primary IgE response IFN-gamma production by PHA-stimulated splenocytes was positively correlated with the number of CD8+ T cells (r = 0.90, P < 0.001) and inversely related to the level of serum IgE (r = -0.77, P < 0.020); serum IgE was inversely related to the number of CD8+ T cells (r = -0.92, P < 0.001). The reduced capacity of spleen cells from ricin and antigen immunized rats to produce IFN-gamma was first seen 7 days after immunization. The fall in the ability of splenocytes to secrete IFN-gamma closely paralleled the rise in serum IgE. IL-2 was assayed using an IL-2-dependent cell line which responded to rat IL-2 but not IL-4. Production of IL-2 by splenocytes taken from rats immunized with ricin+antigen was not significantly different to that produced by comparable cells obtained from animals immunized with antigen alone or saline. However, the levels of IL-4 mRNA, detected in ionomycin and PMA-stimulated splenocytes using a quantitative polymerase chain reaction (PCR) procedure, were three- to fourfold higher in ricin and antigen immunized animals as compared with control animals. Following boosting with antigen and ricin the levels of IL-4 message detected increased a further three- to fourfold. These data show that the potentiated IgE response produced by immunization with antigen+ricin is associated with a decreased ability of splenocytes to produce IFN-gamma and an increased capacity to make IL-4.
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