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- W2022995796 abstract "Mouse erythroleukemia (MEL) cell erythroid differentiation induced by dimethyl sulfoxide or hexamethylene bisacetamide (HMBA) is accompanied by the production of hemoglobin, terminal cell division and decreases in lactate production and fructose 2,6-bisphosphate levels. A number of studies have suggested that decreases in the cellular level of protein phosphotyrosine content may play a role in MEL cell differentiation. In particular, it was shown that the expression of several protein tyrosine phosphatase genes accompany this process and that the transfection of one of these genes into MEL cells followed by its subsequent expression induced eythroid differentiation. However, none of the physiological substrates for these protein tyrosine phosphatases have been identified. It is shown here that MEL cell differentiation is accompanied by decreases in tyrosine phosphorylation of Vav and possibly of the erythropoietin receptor (EpoR). Immunoprecipitation of the EpoR and analysis of co-precipitated proteins, indicates that the EpoR associates with Vav, STAT5 and an unidentified 60 Kd protein, . HMBA-induced erythroid differentiation abrogates these associations. The phosphatase inhibitors, Na3VO4 and levamisole, inhibit HMBA-induced differentiation as well as the association of the EpoR with Vav, STAT5 and the 60 Kd protein. This is of interest since Na3VO4, at the concentrations used here, has been shown to be a potent inhibitor of the activity of protein tyrosine phosphatases. These results suggest that levamisole, at least indirectly, acts by a molecular mechanism similar to that of Na3VO4 and that the loss of the association of the EpoR with Vav, STAT5, and and/or the reduction in the level of tyrosine phosphorylation of these proteins may play a role in MEL cell differentiation." @default.
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- W2022995796 date "1998-06-01" @default.
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- W2022995796 title "Dephosphorylation of Vav is associated with the induction of mouse erythroleukemia cell differentiation: effects of orthovanadate and levamisole." @default.
- W2022995796 doi "https://doi.org/10.3892/ijo.12.6.1307" @default.
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