Abstract:
:The program of biochemical and molecular events necessary for commitment to erythroid cell differentiation is particularly well characterized in murine Friend erythroleukemia cell lines. Commitment to hemoglobin synthesis in response to a variety of chemical inducers, including hexamethylene bisacetamide and dimethyl sulfoxide is completed by 24 h and proceeds to terminal differentiation by 96 h. Phorbol 12-myristate 13-acetate, a classical tumor promoter phorbol ester that binds to protein kinase C, blocks differentiation in a reversible manner, suggesting an important role for protein kinase C signaling pathways. The classical protein kinase C isoforms alpha, betaI, and betaII, play distinct roles in the transduction of proliferative and differentiative signals in human, as well as in murine, erythroleukemia cells. Protein kinase Calpha has been implicated in differentiation of human erythroleukemia cells although its translocation to the nucleus has not been observed. Taking advantage of the ability of phorbol 12-myristate 13-acetate to block differentiation in Friend erythroleukemia cells, we determined the localization of the predominant protein kinase C isoforms alpha and betaI during differentiation and in response to their blockade. The ability of phorbol myristate acetate to preferentially diminish protein kinase Calpha-protein localization to the nucleus by 24 h and thereby block differentiation induced by hexamethylene bisacetamide was paralleled by the ability of protein kinase Calpha antisense transfection to block differentiation. In addition, beta-globin transcription, assessed by polymerase chain reaction, was significantly decreased in protein kinase Calpha antisense-transfected cells compared to that seen in vector transfected ones. Taken together, these data suggest an important temporal role for nuclear protein kinase Calpha localization in Friend erythroleukemia cell differentiation.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Mallia CM,Aguirre V,McGary E,Tang Y,Scandurro AB,Liu C,Noguchi CT,Beckman BSdoi
10.1006/excr.1998.4312subject
Has Abstractpub_date
1999-02-01 00:00:00pages
348-54issue
2eissn
0014-4827issn
1090-2422pii
S0014-4827(98)94312-9journal_volume
246pub_type
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