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- W2029041641 abstract "We studied the level of the cytosolic phosphotyrosine protein phosphatase (PTPase) (originally termed low-Mr acid phosphatase) in normal NIH/3T3 and in v-erb B-transformed fibroblasts. The level of the enzyme, assayed by ELISA, was inversely related to cell proliferation, normally growing cells had less enzyme than their contact-inhibited counterparts and v-erbB transformants had less enzyme than normal NIH/3T3. In order to overexpress the enzyme and study its effects in normal and transformed cells, we transfected a synthetic gene coding for the PTPase in control NIH/3T3 and v-erbB transformants. The overexpressed enzyme was recognized by antibodies raised against the native enzyme and, in cells overexpressing the PTPase, we observed a marked dephosphorylation of tyrosyl residues of cellular proteins. Cell proliferation, in both normal and v-erbB transformants overexpressing the PTPase, was measured. We observed that PTPase overexpression was accompanied by significantly reduced thymidine incorporation in both cell types, either serum-starved or serum-stimulated. The ability of transformed v-erbB cells to grow in soft agar was also markedly decreased by overexpression of the enzyme. Taken together, our results indicate that overexpression of PTPase might interfere with mitogenic signalling pathways in both normal and transformed cells, and propose a role for PTPase in the control of cell proliferation." @default.
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- W2029041641 date "1992-06-19" @default.
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- W2029041641 title "Overexpression of a synthetic phosphotyrosine protein phosphatase gene inhibits normal and transformed cell growth" @default.
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- W2029041641 doi "https://doi.org/10.1002/ijc.2910510424" @default.
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