PMID: 863543May 15, 1977

Morphological transformation of early passage golden Syrian hamster embryo cells derived from cryopreserved primary cultures as a reliable in vitro bioassay for identifying diverse carcinogens

International Journal of Cancer. Journal International Du Cancer
R J PientaW B Lebherz

Abstract

Cryopreserved primary cultures of golden Syrian hamster embryo cells were used as the source of target and feeder cells for establishing an in vitro carcinogenesis bioassay. The primary culture giving the best overall response in a pretest before freezing gave positive results in 20 consecutive experiments when retested with 3-methylcholanthrene after cryopreservation, indicating that pretested cryopreserved cultures can serve as a source of susceptible target cells in an in vitro carcinogenesis bioassay. Similarly prepared and cryopreserved cultures served satisfactorily as feeder cells. Susceptible positive cultures were used to test a large number of carcinogenic and non-carcinogenic chemicals in this system. The results showed a very high positive correlation (90.8%) between morphological transformation and the reported carcinogenic activity of the chemicals. Transformation was not observed when cells were tested with a few carcinogens that may not be metabolized to their active forms by early passage hamster embryo cells. N-2-acetylaminofluorene transformed cells only when tested in the presence of hamster liver microsomes. No false positive results were obtained when non-carcinogens were bioassayed, nor was spontaneous tr...Continue Reading

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