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- W1584738228 abstract "Seven murine and 17 human tumor-derived cell lines were tested for their ability to grow in methionine-free medium containing the methionine precursor homocysteine. Three murine tumors, SP1, MDAY-D2, and L1210, failed to grow in this medium and were therefore methionine dependent (Met-Dep). In contrast, all human tumors, including 8 recently established cell lines, were methionine independent (Met-Indep). Concanavalin A-induced lymphocyte mitogenesis was also Met-Indep but required 3 to 4 times the amount of homocysteine needed for the growth of normal fibroblasts or Met-Indep tumors. In addition, lymphocyte mitogenesis was also supported by exogenous 5'-methylthioadenosine, another methionine precursor formed during polyamine synthesis. In contrast, Met-Dep tumors did not respond to increasing homocysteine concentration, nor was their growth supported by 5'-methylthioadenosine. These findings demonstrate that Met-Dep can occur by varied mechanisms relating to such parameters as homocysteine concentration and the ability of cells to generate Met-Indep revertants or to grow in 5'-methylthioadenosine. In general, we found the Met-Dep phenotype to be more common in murine tumor cells and to occur infrequently in human tumors. This may imply a species difference in methionine metabolism." @default.
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- W1584738228 date "1988-12-01" @default.
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- W1584738228 title "Patterns of methionine auxotrophy in normal and neoplastic cells: the methionine independence of lymphocyte mitogenesis and low frequency of the methionine-dependent phenotype in human tumors." @default.
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