Cell-cycle-dependent regulation of erythropoietin receptor gene
| Autor: | Komatsu N, Kirito K, Kashii Y, Yusuke Furukawa, Kikuchi J, Suwabe N, Yamamoto M, Miura Y |
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| Rok vydání: | 1997 |
| Předmět: |
Models
Genetic Gene Expression Regulation Leukemic Cell Cycle Granulocyte-Macrophage Colony-Stimulating Factor Cell Separation Resting Phase Cell Cycle Recombinant Proteins Cell Line Neoplasm Proteins DNA-Binding Proteins GATA2 Transcription Factor Leukemia Megakaryoblastic Acute Receptors Erythropoietin Erythroid-Specific DNA-Binding Factors Humans GATA1 Transcription Factor RNA Messenger Erythropoietin Cell Division Transcription Factors |
| Zdroj: | Europe PubMed Central |
| ISSN: | 0006-4971 |
| Popis: | To understand the regulatory mechanism of erythropoietin (EPO) receptor (EPOR) gene expression, the effect of EPO on the steady-state level of EPOR mRNA was examined using the human EPO-dependent cell line UT-7 as a model system. We found that the treatment of UT-7 cells with EPO resulted in a transient decrease of the EPOR mRNA level. This transient downregulation was also induced by stimulation with granulocyte-macrophage colony-stimulating factor (GM-CSF), another stimulator of UT-7 cell growth. These results raised the possibility that EPOR gene expression is in part related to cell growth. Moreover, it was found that EPO-induced downregulation of EPOR mRNA level was preceded by a transient downregulation of GATA-1 mRNA. To examine the relationship between the expression of EPOR, GATA-1, and GATA-2 mRNA levels and the cell cycle, logarithmically growing UT-7 cells were centrifugically fractionated according to the cell-cycle phase. Both EPOR and GATA-1 mRNA levels, but not the GATA-2 mRNA level, concomitantly decreased at the G0/G1 phase and increased at the S and G2/M phases. An electrophoretic mobility shift assay (EMSA) showed that in EPO-stimulated UT-7 cells, the dynamic changes in EPOR gene expression paralleled the GATA-1 DNA-binding activity to the oligonucleotide probe containing a GATA-binding site located at the promoter region of the EPOR gene. These findings suggest that the regulation of EPOR mRNA level is mainly associated with GATA-1 gene expression in UT-7 cells undergoing proliferation, and that these serial events are under the control of, or related to, the cell cycle. |
| Databáze: | OpenAIRE |
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