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Cell Growth & Differentiation, Vol 5, Issue 11 1195-1203, Copyright © 1994 by American Association of Cancer Research


ARTICLES

Overexpression of protein kinase C-zeta stimulates leukemic cell differentiation

DK Ways, K Posekany, J deVente, T Garris, J Chen, J Hooker, W Qin, P Cook, D Fletcher and P Parker
Department of Medicine, East Carolina University School of Medicine, Greenville, North Carolina 27858-4354.

A function for protein kinase C-zeta (PKC-zeta), a member of the phorbol ester nonresponsive atypical protein kinase C subfamily, in modulating differentiation was examined in the leukemic U937 cell. Transfected U937 cells stably overexpressing PKC-zeta displayed a longer doubling time, lower saturation density at confluency, and an increase in adherence to plastic as compared to control cells. PKC-zeta cells expressed a more differentiated phenotype as assessed by changes in morphology, surface antigen expression, and lysosomal enzyme activities and were distinct from parental U937 cells stimulated to differentiate by exposure to phorbol esters. In contrast to parental U937 cells, PKC-zeta cells constitutively expressed mRNA transcripts for c-jun and a low mobility AP-1 binding activity. Thus, PKC-zeta overexpression stimulates a type of phenotypic differentiation that differs significantly from maturation occurring upon activation of other PKC subfamilies induced by phorbol ester treatment. Increased expression of the c-jun protooncogene and an increase in AP-1 binding activity in PKC-zeta cells provides a potential mechanism for explaining the altered differentiation status of this cell.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1994 by the American Association of Cancer Research.