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The p53 pathway is synergized by p38 MAPK signaling to mediate 11,11'-dideoxyverticillin-induced G2/M arrest

Yi Chen1, Ze-Hong Miao, Wei-Min Zhao

  • 1Division of Anti-tumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Science, Chinese Academy of Sciences, Shanghai, PR China.

FEBS Letters
|June 21, 2005
PubMed

Insights

The anticancer compound 11,11'-dideoxyverticillin halts colon cancer cell division at the G2/M phase. This cell cycle arrest is primarily mediated by the p53-Chk2 pathway, with p38 MAPK potentially accelerating the process.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Pharmacology

Background:

  • The Shiraia bambusicola fungus produces 11,11 -dideoxyverticillin, a phytochemical with known anticancer properties.
  • Understanding the precise mechanisms of action for novel anticancer compounds is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the effects of 11,11 -dideoxyverticillin on cancer cell cycle progression.
  • To elucidate the molecular pathways involved in 11,11 -dideoxyverticillin-induced cell cycle arrest.

Main Methods:

  • Human colon cancer cells (HCT-116) were treated with varying concentrations and durations of 11,11 -dideoxyverticillin.
  • Western blotting was used to assess protein levels (p53, phospho-p53, phospho-Chk2, phospho-p38 MAPK).
  • RNA interference was employed to inhibit p53 expression, and specific kinase inhibitors (SB203580) were used to block p38 MAPK activity.

Main Results:

  • 11,11 -dideoxyverticillin induced a dose- and time-dependent G2/M phase cell cycle arrest in HCT-116 cells.
  • The arrest was associated with increased levels of p53, phospho-p53(ser20), and phospho-Chk2(Thr 68).
  • Inhibition of p53 abolished the G2/M arrest and phospho-Chk2 induction. p38 MAPK activation was observed, and its inhibition by SB203580 delayed but did not prevent the G2/M arrest.

Conclusions:

  • The p53-mediated phosphorylation of Chk2 plays a critical role in 11,11 -dideoxyverticillin-induced G2/M cell cycle arrest.
  • p38 MAPK signaling may act to accelerate this G2/M arrest.
  • These findings suggest a complex interplay between p53, Chk2, and p38 MAPK in the cellular response to 11,11 -dideoxyverticillin.

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