Proteasome- and p38-dependent regulation of ERK3 expression - PubMed (original) (raw)
. 2001 Apr 6;276(14):10759-66.
doi: 10.1074/jbc.M008567200. Epub 2001 Jan 8.
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- PMID: 11148204
- DOI: 10.1074/jbc.M008567200
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Proteasome- and p38-dependent regulation of ERK3 expression
J Zimmermann et al. J Biol Chem. 2001.
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Abstract
Proteasome inhibition leads to accumulation of transcription factors, heat shock proteins, cyclins, and other proteasome substrate proteins by blocking their proteolytic degradation. An increase in gene transcription upon proteasome inhibition was found for a group of proteins, including p21(WAF1/CIP1), ubiquitin, and transcription factors. In this study, we have demonstrated selective up-regulation of extracellular signal-regulated kinase 3 (ERK3) mRNA and protein expression upon treatment with peptide-based proteasome inhibitors or lactacystin. ERK3 is a family member of the mitogen-activated protein kinases (also called ERK) that are key mediators of signal transduction from the cell surface to the nucleus. ERK3 up-regulation is independent of the p53, Bcl2, and caspase 3 status of cells. p38 pathway kinase inhibitors prevent proteasome-dependent ERK3 induction and enhance the antiproliferative effect of proteasome inhibitors. MCF-7 cells expressing ERK3 ectopically show increased resistance toward proteasome inhibition. The results indicate that ERK3 expression is a consequence of p38 pathway activation and most probably represents an intracellular defense or rescue mechanism against cell stress and damage induced by proteasome inhibition.
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