标题：Reversion to methionine independence in simian virus 40-transformed human and malignant rat fibroblasts is associated with altered ploidy and altered properties of transformation
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1979
卷号：76
期号：3
页码：1313-1317
DOI：10.1073/pnas.76.3.1313
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Many transformed and malignant cells, unlike normal cells, do not grow when methionine in the growth medium is replaced by its immediate precursor homocysteine [Chello, P. & Bertino, J. (1973) Cancer Res. 33, 1898-1904 and Hoffman, R. & Erbe, R. (1976) Proc. Natl. Acad. Sci. USA 73, 1523-1527]. Rare cells from those populations revert to methionine independence [Hoffman, R., Jacobsen, S. & Erbe, R. (1978) Biochem. Biophys. Res. Commun. 82, 228-234]. We report here that methionine-independent revertants of both human fibroblasts transformed by simian virus 40 and malignant rat fibroblasts concomitantly revert for some of the properties associated with the transformed state. Of the 13 methionine-independent revertants described here, 5 showed increased anchorage dependence as reflected by reduced cloning efficiences in methylcellulose; 8 showed an increased serum requirement for optimal growth; 8 showed decreased cell density in medium containing high serum; and 3 altered their cell morphology significantly. Eight of the 13 have increased chromosome numbers. All lines tested contained immunologically identifiable tumor antigen of simian virus 40. Thus by selecting for methionine independence it is possible to select for heterogeneous transformation revertants, indicating further a relationship between altered methionine metabolism and oncogenic transformation. Therefore a positive metabolic method to select for transformation revertants has been developed, and its use has resulted in selection of human transformation revertants.
关键词：positive metabolic selection ; human transformation revertants
