PMID: 6974214Sep 1, 1981Paper

Mechanisms of anti-tumor action of Corynebacterium parvum. I. Potentiated tumor-specific immunity and its therapeutic limitations

The Journal of Experimental Medicine
E S DyeC D Mills

Abstract

The anti-tumor mechanism in mice induced by a subcutaneous injection of syngeneic tumor cells admixed with Corynebacterium parvum was investigated. When mice were implanted in a hind footpad with x 2 1096) tumor cells admixed with 100 microgram C. parvum, the tumor that emerged grew progressively for about 9 d and then underwent progressive and complete regression. It was found that this C. parvum-induced regression was associated with the acquisition of a systemic, T cell-mediated mechanism of immunity to tumor-specific transplantation antigens, which enabled the host to cause the regression of an untreated test tumor growing simultaneously at a distant site. The generation of a C. parvum-potentiated anti-tumor response was dependent on the presence of tumor cells in close association with C. parvum, tumor immunogenicity, and the quantity of tumor antigen in the admixture. The anti-tumor immunity was specific for the tumor in the therapeutic admixture and could be adoptively transferred to normal recipients with Thy-1.2-positive lymphocytes, but not with serum. Complete regression of a distant test tumor by the C. parvum-tumor admixture was limited to tumors below a certain critical size.

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