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A novel histone deacetylase pathway regulates mitosis by modulating Aurora B kinase activity

Yun Li1, Gary D Kao, Benjamin A Garcia

  • 1Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Institute for Diabetes, Obesity, and Metabolism, University of Pennsylvania School of Medicine, Philadelphia, 19104, USA.

Genes & Development
|September 19, 2006
PubMed

Insights

Histone deacetylase 3 (HDAC3) regulates mitosis independently of transcription. This pathway, involving histone modifications and protein interactions, is a novel target for HDAC inhibitors used in cancer therapy.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Histone deacetylase (HDAC) inhibitors show promise as anti-cancer agents, but their precise mechanisms remain unclear.
  • HDACs typically repress gene expression by associating with transcription factors.

Purpose of the Study:

  • To elucidate the role of HDAC3 in cell cycle regulation and mitosis.
  • To identify the molecular targets and pathways affected by HDAC3 during mitosis.
  • To explore the potential of HDAC3 as a therapeutic target in cancer treatment.

Main Methods:

  • Investigated the interaction of HDAC3 with A-Kinase-Anchoring Proteins (AKAP95 and HA95) on mitotic chromosomes.
  • Analyzed the deacetylation of histone H3 by HDAC3 in mitosis.
  • Examined the phosphorylation of H3S10 by Aurora B kinase and its effect on HP1 protein dissociation from heterochromatin.

Main Results:

  • HDAC3 functions as a critical, transcription-independent regulator of mitosis.
  • HDAC3 forms a complex with AKAP95 and HA95, which localize to mitotic chromosomes.
  • Deacetylation of histone H3 by HDAC3 creates a hypoacetylated tail, a preferred substrate for Aurora B kinase.
  • Aurora B-mediated phosphorylation of H3S10 causes HP1 dissociation from mitotic heterochromatin.
  • This pathway is essential for proper mitotic progression.

Conclusions:

  • HDAC3 plays a vital role in mitosis through a transcription-independent mechanism.
  • The identified pathway involving histone modifications and protein associations represents an unexpected target for HDAC inhibitors.
  • These findings offer new insights into the anti-cancer mechanisms of HDAC inhibitors and suggest potential therapeutic strategies.

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