Induction of Simian Virus 40 (SV40) Transplantation Immunity in Mice by SV40-Transformed Cells of Various Species

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Abstract
Specific tumor rejection was obtained with the use of simian virus 40 (SV40)-transformed cells from several species Including man, rat, ape, sheep, and hamster. Growth of the syngeneic sarcoma mKSA in BALB/c mice was strikingly inhibited following a single immunization with as few as 103 intact, viable cells. Non-SV40-transformed cells did not induce tumor rejection activity nor did SV40-transformed lines induce immunity against the 3-methylcholanthrene-induced sarcoma Meth A, syngeneic with BALB/c mice. A close relationship existed between the tumor rejection antigen, the tumor-specific transplantation antigen (TSTA) located on the plasma membrane, and the intranuclear tumor antigen (T-ag). Both were associated with the DNA sequence of the early region of the SV40 genome, and TSTA activity was found in the nucleus. However, we did not observe a close parallelism between T-ag activity and TSTA. Nevertheless, the results strongly suggested that TSTA, like T-ag, was encoded by the virus.

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