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CCNE1 and E2F1 Partially Suppress G1 Phase Arrest Caused by Spliceostatin A Treatment

Kei Kikuchi1, Daisuke Kaida2

  • 1School of Medicine, University of Toyama, Toyama 930-0194, Japan.

International Journal of Molecular Sciences
|November 13, 2021
PubMed

Insights

Spliceostatin A (SSA) causes G1 phase arrest by downregulating cell cycle genes CCNE1 and E2F1. This contributes to SSA

Area of Science:

  • Molecular Biology
  • Cell Cycle Regulation
  • Cancer Research

Background:

  • Spliceostatin A (SSA) is a potent splicing inhibitor affecting cell cycle progression.
  • Previous studies linked SSA to G1 phase arrest via p27 and p27* upregulation.
  • The precise molecular mechanisms of SSA-induced G1 arrest require further investigation.

Purpose of the Study:

  • To elucidate the detailed molecular mechanisms of G1 phase arrest induced by SSA.
  • To investigate the role of cell cycle regulators CCNE1, CCNE2, and E2F1 in SSA's effects.

Main Methods:

  • Analysis of mRNA and protein levels of cell cycle regulators in SSA-treated cells.
  • Assessment of transcription elongation efficiency for key genes.
  • Experimental manipulation (overexpression and knockout) to evaluate gene function in G1 arrest.

Main Results:

  • SSA treatment led to the downregulation of CCNE1, CCNE2, and E2F1 at both mRNA and protein levels.
  • Transcription elongation was impaired for these cell cycle-related genes in SSA-treated cells.
  • Overexpression of CCNE1 and E2F1, along with CDKN1B knockout, partially rescued SSA-induced G1 phase arrest.

Conclusions:

  • Downregulation of CCNE1 and E2F1 contributes significantly to SSA-induced G1 phase arrest.
  • Impaired transcription elongation of CCNE1 and E2F1 is a key mechanism.
  • Other factors may also be involved in the complex G1 arrest induced by SSA.
Keywords:
E2F1G1 phasecell cyclecyclin Epre-mRNA splicingspliceostatin A

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