Ats T mutant of Schmidt ruppin strain of rous sarcoma virus restricted at 39.5°C for the morphological transformation and the tumorigenicity of chicken embryo fibroblasts
- 15 January 1982
- journal article
- research article
- Published by Wiley in International Journal of Cancer
- Vol. 29 (1), 69-76
- https://doi.org/10.1002/ijc.2910290112
Abstract
In order to investigate a possible correlation beween in vitro transformation and tumorigenicity in ovo, a new temperature‐sensitive class T mutant of Rous Sarcoma Virus was isolated with a lower (39·5C) restrictive temperature for morphological transformation. This lower restrictive temperature was compatible with the survival of chicken and duck eggs for the tumorigenicity studies. In chicken embryo fibroblasts (CEF) infected by this new mutant, PA 17, and cultured at 39·5C, increase of hexose uptake, plasminogen activator production and anchorageindependent growth were only partially restricted, requiring incubation at 41·5C for a complete shut‐off. Tumorigenicity in chicken and duck eggs inoculated with CEF infected and transformed by PA 17 was restricted at 39·5C, correlating well with the restriction of morpholgical transformation at this temperature. The kinase activity of the transforming protein pp in lysates of PA 17 infected cells cultured at permissive or restrictive temperatures was labile in RIPA buffer, as in the case of some previously examined tsT mutants. In the non‐ionic detergent NP40 buffer, the kinase activity of PA 17 infected cell lysates was better conserved and showed a moderate temperature dependence. These results suggest that, in spite of the correlations between the transformed cell phenotype in vitro and cell tumorigenicity in ovo, it is difficult to establish a quantitative relationship.This publication has 37 references indexed in Scilit:
- Identification of a cellular protein substrate phosphorylated by the avian sarcoma virus-transforming gene productCell, 1980
- Phenotypic heterogeneity among temperature-sensitive mutants of rous sarcoma virus. Studies with inhibitors of protein synthesisVirology, 1980
- Protein kinase activity associated with the avian sarcoma virus src gene product.Proceedings of the National Academy of Sciences of the United States of America, 1978
- Identification of a transformation-specific antigen induced by an avian sarcoma virusNature, 1977
- Cyclic AMP levels and 2-deoxyglucose uptake in cells transformed by temperature-sensitive class T mutants of rous sarcoma virusVirology, 1977
- Growth stimulation of chick embryo neuroretinal cells infected with Rous sarcoma virus: Relationship to viral replication and morphological transformationVirology, 1976
- Increased protease levels in transformed cells: A casein overlay assay for the detection of plasminogen activator productionCell, 1974
- Characteristics of a conditional mutant of Rous sarcoma virus defective in ability to transform cells at high temperatureVirology, 1972
- Characteristics of two new avian tumor virus subgroupsVirology, 1969
- Growth of rous sarcoma virus and cells in nonconfluent chick embryo monolayersVirology, 1961