Regulation of BCL-6 gene expression in human myeloid/monocytoid leukemic cells.
Leukemia
; 11(5): 694-700, 1997 May.
Article
em En
| MEDLINE
| ID: mdl-9180294
ABSTRACT
We demonstrated in the present study that the BCL-6 transcripts were detectable not only in B cells, but also in circulating granulocytes and monocytes from normal individuals, and in human acute nonlymphocytic leukemia cells of certain subtypes (M3, M4, M5). Then, with an assumption that the BCL-6 gene expression may be related to the differentiation of myeloid cells, we analyzed the inducibility of BCL-6 gene expression along monocytic lineage differentiation in HL-60 and U-937 cells by treating them with 12-O-tetradecanoylphorbol-13-acetate (TPA). Although the expression of BCL-6 transcripts was very low or undetectable in untreated HL-60 or U-937 cells, treatment of these cells with TPA to induce monocytic differentiation resulted in an apparent increase of BCL-6 mRNA, suggesting that BCL-6 gene expression is not limited to B cells and it is closely associated with monocytic lineage differentiation. The BCL-6 transcripts in TPA-treated U-937 cells were superinduced by the treatment with cycloheximide (CHX) and the half-life of the BCL-6 mRNA was apparently prolonged when TPA-treated U-937 cells were exposed to CHX in the presence of actinomycin D (ACD). Furthermore, the nuclear run-on assay revealed that the BCL-6 transcription signals were enhanced by TPA treatment. These results suggest that the increase of BCL-6 mRNA in U-937 cells stimulated with TPA to induce monocytic lineage differentiation is mediated by both transcriptional and post-transcriptional regulation.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fatores de Transcrição
/
Leucemia Mieloide Aguda
/
Regulação Neoplásica da Expressão Gênica
/
Proteínas Proto-Oncogênicas
/
Células HL-60
/
Proteínas de Ligação a DNA
Limite:
Adult
/
Humans
Idioma:
En
Revista:
Leukemia
Assunto da revista:
HEMATOLOGIA
/
NEOPLASIAS
Ano de publicação:
1997
Tipo de documento:
Article
País de afiliação:
Japão