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6DMAP inhibition of early cell cycle events and induction of mitotic abnormalities

M Simili1, P Pellerano, S Pigullo

  • 1G.B.T. Institute of Mutagenesis and Differentiation of CNR, Pisa, Italy.

Mutagenesis
|October 6, 1997
PubMed

Insights

N-6 dimethylaminopurine (6DMAP) disrupts cell division by inhibiting DNA synthesis and affecting cytoskeletal components. This leads to abnormal mitosis, suggesting a G1 phase signaling pathway disturbance.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • N-6 dimethylaminopurine (6DMAP) induces aberrant mitosis in various cell types.
  • Previous studies indicated 6DMAP inhibits DNA synthesis, suggesting cell cycle interference.

Purpose of the Study:

  • To elucidate the cellular targets and mechanism of action of 6DMAP.
  • To investigate the specific cellular pathways affected by 6DMAP.

Main Methods:

  • Investigated the effect of 6DMAP on ribosomal protein S6 phosphorylation and p70S6k activation.
  • Assessed the impact of 6DMAP on MAP kinase phosphorylation.
  • Examined the effects of 6DMAP on cytoskeletal components and cell morphology.
  • Correlated 6DMAP's effects on DNA synthesis with micronuclei formation.

Main Results:

  • 6DMAP inhibited ribosomal protein S6 phosphorylation and p70S6k activation, but not MAP kinase phosphorylation, indicating specific kinase inhibition.
  • The compound caused significant alterations in cytoskeletal structure and rapid cell morphological changes.
  • The effective dose and treatment time for inducing micronuclei were consistent with those for DNA synthesis inhibition.

Conclusions:

  • 6DMAP acts as a protein kinase inhibitor affecting specific signaling pathways.
  • Disruption of cytoskeletal integrity and DNA synthesis by 6DMAP contributes to abnormal mitosis.
  • A disturbance in G1 phase signal transduction pathways is implicated in 6DMAP-induced abnormal mitosis.

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