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Research Article

Regulation of platelet-derived growth factor gene expression by transforming growth factor beta and phorbol ester in human leukemia cell lines.

T P Mäkelä, R Alitalo, Y Paulsson, B Westermark, C H Heldin, K Alitalo
T P Mäkelä
Department of Virology, University of Helsinki, Finland.
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R Alitalo
Department of Virology, University of Helsinki, Finland.
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Y Paulsson
Department of Virology, University of Helsinki, Finland.
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B Westermark
Department of Virology, University of Helsinki, Finland.
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C H Heldin
Department of Virology, University of Helsinki, Finland.
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K Alitalo
Department of Virology, University of Helsinki, Finland.
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DOI: 10.1128/MCB.7.10.3656
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ABSTRACT

We studied the expression of the genes encoding the A and B chains of platelet-derived growth factor (PDGF) in a number of human leukemia cell lines. Steady-state expression of the A-chain RNA was seen only in the promonocytic leukemia cell line U937 and in the T-cell leukemia cell line MOLT-4. It has previously been reported that both PDGF A and PDGF B genes are induced during megakaryoblastic differentiation of the K562 erythroleukemia cells and transiently during monocytic differentiation of the promyelocytic leukemia cell line HL-60 and U937 cells. In this study we show that PDGF A RNA expression was induced in HL-60 and Jurkat T-cell leukemia cells and increased in U937 and MOLT-4 cells after a 1- to 2-h stimulation with an 8 pM concentration of transforming growth factor beta (TGF-beta). PDGF A RNA remained at a constant, elevated level for at least 24 h in U937 cells, but returned to undetectable levels within 12 h in HL-60 cells. No PDGF A expression was induced by TGF-beta in K562 cells or in lung carcinoma cells (A549). Interestingly, essentially no PDGF B-chain (c-sis proto-oncogene) RNA was expressed simultaneously with PDGF A. In the presence of TGF-beta and protein synthesis inhibitors, PDGF A RNA was superinduced at least 20-fold in the U937 and HL-60 cells. PDGF A expression was accompanied by secretion of immunoprecipitable PDGF to the culture medium of HL-60 and U937 cells. The phorbol ester tumor promoter tetradecanoyl phorbol acetate also increased PDGF A expression with similar kinetics, but with a mechanism distinct from that of TGF-beta. These results suggest a role for TGF-beta in the differential regulation of expression of the PDGF genes.

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Regulation of platelet-derived growth factor gene expression by transforming growth factor beta and phorbol ester in human leukemia cell lines.
T P Mäkelä, R Alitalo, Y Paulsson, B Westermark, C H Heldin, K Alitalo
Molecular and Cellular Biology Oct 1987, 7 (10) 3656-3662; DOI: 10.1128/MCB.7.10.3656

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Regulation of platelet-derived growth factor gene expression by transforming growth factor beta and phorbol ester in human leukemia cell lines.
T P Mäkelä, R Alitalo, Y Paulsson, B Westermark, C H Heldin, K Alitalo
Molecular and Cellular Biology Oct 1987, 7 (10) 3656-3662; DOI: 10.1128/MCB.7.10.3656
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