Protein kinase calpha is an effector of hexamethylene bisacetamide-induced differentiation of Friend erythroleukemia cells.

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 Res

authors

Mallia CM,Aguirre V,McGary E,Tang Y,Scandurro AB,Liu C,Noguchi CT,Beckman BS

doi

10.1006/excr.1998.4312

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

348-54

issue

2

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(98)94312-9

journal_volume

246

pub_type

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