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Research Article

A short-lived nuclear phosphoprotein encoded by the human ets-2 proto-oncogene is stabilized by activation of protein kinase C.

S Fujiwara, R J Fisher, N K Bhat, S M Diaz de la Espina, T S Papas
S Fujiwara
Laboratory of Molecular Oncology, National Cancer Institute, Frederick, Maryland 21701-1013.
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R J Fisher
Laboratory of Molecular Oncology, National Cancer Institute, Frederick, Maryland 21701-1013.
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N K Bhat
Laboratory of Molecular Oncology, National Cancer Institute, Frederick, Maryland 21701-1013.
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S M Diaz de la Espina
Laboratory of Molecular Oncology, National Cancer Institute, Frederick, Maryland 21701-1013.
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T S Papas
Laboratory of Molecular Oncology, National Cancer Institute, Frederick, Maryland 21701-1013.
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DOI: 10.1128/MCB.8.11.4700
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ABSTRACT

The human ets-2 gene is a homolog of the v-ets oncogene of the E26 virus and codes for a 56-kilodalton nuclear protein. The ets-2 protein is phosphorylated and has a rapid turnover, with a half-life of 20 min. When human lymphocytic CEM cells were treated with the tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA), the level of the ets-2 protein was quickly elevated 5- to 20-fold. This effect of TPA was mimicked by a synthetic diacylglycerol, 1-oleoyl-2-acetyl glycerol, and was blocked by the protein kinase C inhibitor H7, indicating that protein kinase C is involved in the induction. The increase in the ets-2 protein was due to stabilization of the protein, because the protein had a half-life of more than 2 h in the presence of TPA and the ets-2 mRNA level did not increase significantly upon TPA treatment. The protein synthesis inhibitor cycloheximide enhanced the effect of TPA on the ets-2 protein and could itself slow turnover of the protein. Properties of the ets-2 protein, such as nuclear localization, phosphorylation, rapid turnover, and response to protein kinase C, indicate that this protein belongs to a group of oncogene proteins which are generally thought to have regulatory functions in the nucleus (e.g., myc, fos, myb, and p53). Our results suggest that protein kinase C, either directly or indirectly, regulates the level of the ets-2 protein by posttranslational mechanisms.

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A short-lived nuclear phosphoprotein encoded by the human ets-2 proto-oncogene is stabilized by activation of protein kinase C.
S Fujiwara, R J Fisher, N K Bhat, S M Diaz de la Espina, T S Papas
Molecular and Cellular Biology Nov 1988, 8 (11) 4700-4706; DOI: 10.1128/MCB.8.11.4700

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A short-lived nuclear phosphoprotein encoded by the human ets-2 proto-oncogene is stabilized by activation of protein kinase C.
S Fujiwara, R J Fisher, N K Bhat, S M Diaz de la Espina, T S Papas
Molecular and Cellular Biology Nov 1988, 8 (11) 4700-4706; DOI: 10.1128/MCB.8.11.4700
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