PMID: 236258Jan 15, 1975Paper

Defects in cell-mediated immunity during growth of a syngeneic simian virus-induced tumor

International Journal of Cancer. Journal International Du Cancer
S B HowellL W Law

Abstract

Four assays of tumor-specific cell-mediated immunity were compared during growth of a syngeneic Simian-virus-40-induced tumor, mKSA. Major differences were found in immunity detected by the tumor neutralization test (the Winn test), direct tumor challenge, the microcytotoxicity assay and the -51chromium-release lymphocytotoxicity assay. Progressive growth of the neoplasm followed by loss of immunity (the eclipse phenomenon) was documented with the Winn test. It was established that this eclipse phenomenon represented a lesion in the T-cell system of tumor-bearing hosts. This lesion was found to be specific and unrelated to anatomic tumor location. The ability to produce graft-versus-host reactions, and the ability to respond to mitogens, were found to be generally intact in tumor-bearing animals. Cells capable of recognizing mKSA tumor antigens and reconstituting an immune response following surgical removal of tumor or upon transfer to normal mice were found in the spleens of mice bearing advanced tumors. No suppressor cells that might account for the eclipse phenomenon could be demonstrated. Tumor-bearer serum did not block neutralizing activity of immune spleen cells in the Winn test, and immune cells were capable of neutral...Continue Reading

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