English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/24173
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Regulation of c-Myc and Max in Megakaryocytic and Monocytic-Macrophagic Differentiation of K562 Cells Induced by Protein Kinase C Modifiers: c-Myc Is Down-Regulated but Does Not Inhibit Differentiation

AuthorsLerga, Ana; Crespo, Piero ; Berciano, María T.; Delgado, M. Dolores ; Cañelles, Matilde; Calés, Carmela ; Richard, Carlos; Ceballos, Eva; Gutierrez, Pilar; Ajenjo, Nuria; Gutkind, Silvio; León, Javier
Issue DateSep-1999
PublisherAmerican Association for Cancer Research
CitationCell Growth and Differentiation 10(9): 639-654 (1999)
AbstractWe have studied the regulation and role of c-Myc and Max in the differentiation pathways induced in K562 cells by 12-O-tetradecanoyl phorbol-13 acetate (TPA) and staurosporine, an activator and inhibitor, respectively, of protein kinase C (PKC). We found that staurosporine induced megakaryocytic differentiation, as revealed by the cellular ultrastructure, platelet formation, and DNA endoreduplication. In contrast, TPA induced a differentiated phenotype that more closely resembled that of the monocyte-macrophage lineage. c-myc expression was down-regulated in K562 differentiated by both TPA and staurosporine, whereas max expression did not change in either case. Although PKC enzymatic activity was low in cells terminally differentiated with TPA and staurosporine, inhibition of PKC activity by itself did not induce c-myc down-regulation. We conclude that the c-myc gene is switched off as a consequence of the differentiation process triggered by these drugs in a manner independent from PKC. Ectopic overexpression of c-Myc in K562 cells did not affect the monocytic-macrophagic and megakaryocytic differentiation, indicating that c-Myc suppression is not required for these processes in K562. Similarly, both differentiation pathways were not affected by Max overexpression or by concomitant overexpression of c-Myc and Max. This result is in contrast with the inhibition of erythroid differentiation of K562 exerted by c-Myc, suggesting divergent roles for c-Myc/Max, depending on the differentiation pathway.
Description16 pages, 12 figures, 1 table.
Publisher version (URL)http://cgd.aacrjournals.org/cgi/content/full/10/9/639
Appears in Collections:(CIB) Artículos
Files in This Item:
File Description SizeFormat 
Lerga-et-al(1999)CG&D.pdf2,73 MBAdobe PDFThumbnail
Show full item record
Review this work

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.