Ana F Quincoces

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We have compared the expression of the ras protooncogene family (H-, K-, and N-ras) in leukemia cell differentiation utilizing as a model K562 and HEL erythroleukemia cells treated either with 1-beta-arabinofuranosylcytosine or 12-O-tetradecanoylphorbol-13-acetate (TPA). 1-beta-D-Arabinofuranosylcytosine induced terminal erythroid differentiation of K562(More)
The final step in the secretory pathway, which is the fusion event between secretory vesicles and the plasma membrane, was reconstructed using highly purified secretory vesicles and cytoplasmic-side-out plasma membrane vesicles from the yeast Saccharomyces cerevisiae. Both organelle preparations were obtained from a sec 6-4 temperature-sensitive mutant.(More)
We have analyzed the expression of the ras gene family during the transit through quiescence-proliferation. H-, K- and N-ras steady-state mRNA levels and total Ras protein levels did not change significantly when NIH3T3 cells were made quiescent by density arrest in the presence of 10% calf serum. By contrast, levels of ras mRNAs in cells that had been made(More)
Suppression of c-myc expression is observed during induced differentiation of several myeloid cell lines and it has been attributed to the cell growth arrest that accompanies terminal differentiation. To dissect the role of c-Myc in the proliferation-differentiation switch we have studied c-myc expression in K562 cells exposed to several chemical agents.(More)
We have studied the effect of ectopic overexpression of a ras gene on the expression of the other two members of the ras gene family. We obtained NIH3T3 cell lines stably transfected with inducible H-ras and N-ras oncogenes. The expression of these genes is driven by a glucocorticoid-responsive promoter and the addition of dexamethasone resulted in a(More)
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