Opposite role of Ras in tumor necrosis factor-α-induced cell cycle regulation: Competition for Raf kinase

Soo Jung Park, Young Youl Kim, Joong Yeon Lim, Gil Ju Seo, Joon Kim, Sang Ick Park, Bum Joon Park

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Ras, a well-known oncogene, induces cell cycle stimulation through the Raf/Erk pathway and leads to cellular transformation, accompanied by other oncogenes such as c-myc and viral oncogenic protein. Here we suggest the interfering role of Ras in tumor necrosis factor (TNF)-α-induced cell cycle regulation. In TSU-Pr1 and T24 (oncogenic Ras cell lines), TNF-α suppresses cell cycle progression without induction of apoptosis, whereas AGS (wild-type Ras) is stimulated in its cell cycle by TNF-α coupled with activation of Erk. However, in TSU-Pr1 and T24, TNF-α leads to dephosphorylation of Erk1/2. Inhibition or activation of Ras can restore or convert TNF-α-induced cell cycle regulation in the cell lines containing the oncogenic Ras (TSU-Pr1 and T24) or AGS, respectively. Regulation of Erk also shows the coincidental pattern. We suggest the competition between the Ras pathway and TNF signaling for the binding to Raf, a common downstream target, as the cause of such reciprocal response, based on co-immunoprecipitation (co-IP) with antibodies against Raf and Ras or cellular Flice-inhibitory protein (c-FLIP), which have been recently identified upstream of Raf in death-ligand-induced cell cycle stimulation. Overexpression of Raf in TSU-Pr1, to reduce the competition, overcomes TNF-induced cell cycle arrest, also supporting our hypotheses.

Original languageEnglish
Pages (from-to)1140-1147
Number of pages8
JournalBiochemical and biophysical research communications
Issue number5
Publication statusPublished - 2001 Oct 12

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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