Abstract
Simian virus 40 (SV40) infection of human diploid cells failed to cause an enhanced production of thymidine kinase during the first 10 days after infection. Thymidine kinase activities from extracts of SV40-transformed cultures (human or simian) were considerably higher than the activity levels in extracts from the normal cells of origin. In addition, whereas the kinase activities obtained for human diploid cultures decreased as the cell sheet became confluent, the kinase activities for SV40-transformed human cells remained high after confluence was reached. Antisera obtained from hamsters bearing SV40 or adeno-7-SV40 hybrid virus tumors selectively inhibited enzyme from transformed sources (human or simian). Also, the antisera selectively inhibited enzyme extracted from SV40-lytically infected monkey cells. Sera from normal animals or from hamsters bearing polyoma tumors failed to inhibit enzymes from normal, SV40-transformed, or SV40-lytically infected cells. The Michaelis constant of partially purified enzyme from SV40-transformed cells was two to five times as high as that obtained for partially purified enzyme from human diploid cell cultures.
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Selected References
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