Abstract
The effects of the anti-tumour agent OK-432 on the immune response to hamster erythrocytes (HRBC) and nucleated chicken erythrocytes (CRBC) were studied in inbred SL mice. Mice were treated repeatedly with OK-432 before immunization with erythrocytes in saline. The cytotoxicity of CRBC-primed spleen cells, as demonstrated by 51Cr release from labelled CRBC, was markedly increased by treatment with OD-432. The delayed footpad reaction to CRBC was significantly augmented by treatment with OK-432. These results in mice indicate that OK-432 can enhance the cellular immune responses which require the contribution of T cells. Such an activation of T cells by OK-432 was observed in the humoral immune response to a trinitrophenyl group. Augmentation of anti-hapten antibody production, suggesting the enhancement of helper T cell activity by OK-432, was noticed after immunization with trinitrophenyl conjugated to erythrocytes. Furthermore, this enhancement of helper T cell activity by OK-432 was confirmed by utilizing an adoptive transfer system. These results support the possibility that T cell activation may be one of the important effects of OK-432 as an immunopotentiator.
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