MKP-1 protein phosphatase participates in c-fos gene derepression in E1A and cHA-ras oncogene transformed fibroblasts under stress conditions
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  • 作者:A. N. Kukushkin (1) (2)
    S. B. Svetlikova (1) (2)
    V. A. Pospelov (1) (2)
  • 关键词:MKP ; 1 ; c ; fos genes ; anisomycin ; transformed fibroblasts ; E1A ; cHa ; ras oncogenes
  • 刊名:Cell and Tissue Biology
  • 出版年:2014
  • 出版时间:March 2014
  • 年:2014
  • 卷:8
  • 期:2
  • 页码:115-121
  • 全文大小:791 KB
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  • 作者单位:A. N. Kukushkin (1) (2)
    S. B. Svetlikova (1) (2)
    V. A. Pospelov (1) (2)

    1. Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia
    2. St. Petersburg State University, St. Petersburg, Russia
  • ISSN:1990-5203
文摘
Immediate-early response gene c-fos expression is repressed and not activated after serum stimulation of serum-starved fibroblasts transformed with E1A and cHA-ras oncogenes. We found previously that stress factors, such as anisomycin, activated c-fos gene transcription in E1A+ras transformants. The MEK/ERK signal pathway played a primary role in this activation. In this paper, we investigated the role of MKP-1-dependent regulation of the c-fos gene through dephosphorylation of ERK kinases. It was revealed that anisomycin activated MKP-1 transcription in E1A+ras transformants for no longer than 1 h and then the transcriptional level dropped. Using MAP-kinase inhibitors, it was established that MKP-1 transcription depended on MEK/ERK and JNK kinase rather than p38 cascades. The anisomycin-induced c-fos gene transcription is stronger after the cell transfection with siRNA MKP-1. Thus, the MKP-1 protein phosphatase carries out negative regulation of c-fos gene transcription by dephosphorylation of ERK kinases, which are key signal components in E1A+ras-transformed cells exposed to the stress agent anisomycin.

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