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Regulation of Antibody Response in Different Immunoglobulin Classes

I. Selective Suppression of anti-DNP IgE Antibody Response by Preadministration of DNP-Coupled Mycobacterium¹

Third Department of Internal Medicine, Osaka University School of Medicine, Fukushima-ku, Osoka, Japan

Abstract

Selective suppression of IgE antibody response was demonstrated. Preadministration of DNP-coupled mycobacterium (DNP-Tbc) inhibited the formation of anti-DNP IgE antibody induced by DNP-OA without any suppressive effect on anti-DNP IgG antibody response. Secondary anti-DNP IgE antibody response by DNP-OA was also significantly depressed by the preadministration of DNP-Tbc. Anti-OA IgE antibody response induced by DNP-OA was also depressed by DNP-Tbc, whereas anti-OA IgE antibody response induced by PAB-OA was not affected by the preadministration of DNP-Tbc. Preimmunization with DNP-MGG induced much higher anti-DNP IgG antibody response than DNP-Tbc, but DNP-MGG did not suppress the induction of anti-DNP IgE antibody. The transfer of DNP-Tbc-primed spleen cells into normal mice depressed anti-DNP IgE antibody response. B cell-depleted cell populations also showed a comparable inhibitory effect to that of unfractionated DNP-Tbc primed cells. In the adoptive cell transfer experiment, DNP-Tbc-primed cells depressed anti-DNP IgE antibody response of DNP-OA-primed cells when these cells were stimulated with DNP-OA. These results suggested that DNP-specific T cells induced with DNP-Tbc selectively inhibited IgE antibody response.

Footnotes

¹ This work was supported by a Grant-in-Aid for immunological research from the Ministry of Education, Science, and Culture, Japan.