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Cell Growth & Differentiation, Vol 3, Issue 10 739-745, Copyright © 1992 by American Association of Cancer Research


ARTICLES

Protein kinase C beta gene expression is associated with susceptibility of human promyelocytic leukemia cells to phorbol ester-induced differentiation

DA Tonetti, M Horio, FR Collart and E Huberman
Biological and Medical Research Division, Argonne National Laboratory, Illinois 60439.

To study the signal transduction pathway leading to phorbol 12-myristate 13-acetate (PMA)-induced differentiation in human promyelocytic HL-60 leukemia cells, we examined the expression of protein kinase C (PKC) isozyme genes in HL-60 cells that are susceptible or resistant to PMA-induced differentiation. The PKC-alpha, -beta, -gamma, -delta, epsilon, and -zeta transcript levels were assessed by Northern blotting, and the PKC-alpha, -beta, and -gamma protein levels were examined by immunoblotting. The PMA-resistant cell variants HL-525 and HL-534 were found to be deficient in the PKC-beta isozyme RNA and protein as compared with the PMA-susceptible HL-60 and HL-205 cell lines. In addition, a "delta-like" PKC RNA species identified in these cells demonstrated a reduced abundance in the HL-525 and HL-534 cells. Southern blot analysis indicated that the observed reduction in PKC-beta gene expression does not appear to be due to a gross deletion or rearrangement of the gene. The expression of the early response genes junB, c-fos, and c-jun was attenuated in PMA-treated HL-525 and HL-534 cells as compared to the PMA-treated HL-60 and HL-205 cells. These results suggest that the signal transduction pathway that leads to PMA-induced differentiation in the HL-60 cell system requires PKC-beta and/or delta-like PKC for the proper expression of the early response genes, and ultimately the expression of genes that define the mature state.


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Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1992 by the American Association of Cancer Research.