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The activity of extracellular signal-regulated kinase is required during G2/M phase before metaphase-anaphase

Katarina Matkovic1, Vesna Lukinovic-Skudar1, Hrvoje Banfic1

  • 1Department of Physiology and Croatian Institute for Brain Research, School of Medicine, University of Zagreb, Salata 3, 10 000, Zagreb, Croatia.

International Journal of Hematology
|January 17, 2009
PubMed

Insights

Extracellular signal-regulated kinase (ERK) activity is crucial for acute myeloid leukemia cell cycle progression through the G(2)/M phase. Inhibiting MEK delays leukemia cell cycle progression, highlighting ERK as a potential therapeutic target.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Cycle Regulation

Background:

  • Extracellular signal-regulated kinase (ERK) pathway inhibitors are investigated as novel therapies for acute myeloid leukemia (AML).
  • ERK's role in cell cycle progression from G(1) to S phase is known, but its function after the restriction point remains unclear.

Purpose of the Study:

  • To investigate the kinetics of ERK activity during the cell cycle in synchronized leukemia cell lines.
  • To evaluate the impact of MEK inhibitors on G(2)/M phase progression in leukemia cells.

Main Methods:

  • Utilized aphidicolin and nocodazole synchronization methods for HL-60 and NB4 leukemia cell lines.
  • Monitored ERK activity throughout the cell cycle.
  • Assessed the effects of MEK inhibitors (PD 98059, U0126) on synchronized cell cycle progression.

Main Results:

  • ERK activity was low in early S phase and increased in late S and G(2)/M phases in aphidicolin-synchronized cells.
  • MEK inhibitors caused a delay in G(2)/M phase progression in synchronized leukemia cells.
  • In nocodazole-synchronized cells, ERK activity was low during M/G(1) transition, and MEK inhibitors did not affect G(1) return.

Conclusions:

  • ERK activity is essential during the G(2)/M phase of the leukemia cell cycle, prior to metaphase-anaphase transition.
  • Targeting the ERK pathway with MEK inhibitors demonstrates potential for disrupting leukemia cell cycle progression.

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