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Kane, S.E. et al.

Use of a cloned multidrug resistance gene for coamplification and overproduction of major excreted protein, a transformation-regulated secreted acid protease.

Malignantly transformed mouse fibroblasts synthesize and secrete large amounts of major excreted protein ( MEP), a 39,000-dalton precursor to an acid protease ( cathepsin L). To evaluate the possible role of this protease in the transformed phenotype, we transfected cloned genes for mouse or human MEP into mouse NIH 3T3 cells with an expression vector for the dominant, selectable human multidrug resistance (MDR1) gene. The cotransfected MEP sequences were efficiently coamplified and transcribed during stepwise selection for multidrug resistance in colchicine. The transfected NIH 3T3 cell lines containing amplified MEP sequences synthesized as much MEP as did Kirsten sarcoma virus-transformed NIH 3T3 cells. The MEP synthesized by cells transfected with the cloned mouse and human MEP genes was also secreted. Elevated synthesis and secretion of MEP by NIH 3T3 cells did not change the nontransformed phenotype of these cells.[1]

References

Use of a cloned multidrug resistance gene for coamplification and overproduction of major excreted protein, a transformation-regulated secreted acid protease. Kane, S.E., Troen, B.R., Gal, S., Ueda, K., Pastan, I., Gottesman, M.M. Mol. Cell. Biol. (1988) [Pubmed]

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