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cAMP signaling regulates histone H3 phosphorylation and mitotic entry through a disruption of G2 progression

Pedro Rodriguez-Collazo1, Sara K Snyder, Rebecca C Chiffer

  • 1Laboratory of Receptor Biology and Gene Expression, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.

Experimental Cell Research
|July 23, 2008
PubMed

Insights

Cyclic AMP (cAMP) signaling impacts cell growth by altering histone H3 phosphorylation. It inhibits cell cycle progression at G2 by disrupting mitotic entry, independent of MAP kinase signaling.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Cyclic AMP (cAMP) signaling influences mammalian somatic cell growth, with prior research focusing on G1 phase regulation by protein kinase A (PKA) and mitogen-activated protein (MAP) kinases.
  • The precise mechanisms by which cAMP affects cell cycle progression, particularly in later phases, remain incompletely understood.

Purpose of the Study:

  • To investigate the role of cAMP signaling in regulating histone H3 phosphorylation throughout the cell cycle.
  • To elucidate the impact of cAMP on cell cycle progression, specifically focusing on G2/M phase transition.

Main Methods:

  • Analysis of histone H3 phosphorylation in quiescent and cycling mammalian somatic cells under varying cAMP conditions.
  • Assessment of cell cycle progression, mitotic entry, and CyclinB/Cdk1 kinase activity.
  • Investigation of the dependence on PKA catalytic subunit expression and cAMP concentration.

Main Results:

  • cAMP signaling modulates histone H3 phosphorylation in a cell cycle-dependent manner, increasing it in quiescent cells and decreasing it in cycling cells.
  • cAMP induces a significant reduction in mitotic histone H3 phosphorylation by disrupting G2 progression and inhibiting mitotic entry.
  • The observed G2 progression inhibition is PKA-dependent, sensitive to cAMP levels, and independent of DNA damage or MAP kinase signaling.

Conclusions:

  • cAMP signaling activates a unique G2 checkpoint mechanism, distinct from previously known pathways.
  • This study provides novel insights into the regulation of G2 phase progression by cAMP signaling in mammalian cells.

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