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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Related Experiment Video

Updated: Feb 22, 2026

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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Dnmt1-dependent Chk1 pathway suppression is protective against neuron division.

Mio Oshikawa1, Kei Okada1, Hidenori Tabata2

  • 1Center for Brain Integration Research (CBIR), Tokyo Medical and Dental University (TMDU), Tokyo 113-8510, Japan.

Development (Cambridge, England)
|September 21, 2017
PubMed
Summary

Neuronal cell death occurs when neurons re-enter the cell cycle. Activating the Checkpoint kinase 1 (Chk1) pathway prevents this death, allowing neuronal division even after injury.

Keywords:
Cell cycleCerebral cortical neuronsChk1Dnmt1Retinoblastoma proteinsStroke

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Neuronal differentiation and cell-cycle exit are tightly regulated processes.
  • Pathological neurons that re-enter the cell cycle typically undergo cell death, but the mechanisms of this mitotic resistance are not fully understood.

Purpose of the Study:

  • To investigate the mechanisms underlying mitotic resistance in postmitotic neurons.
  • To determine the role of the retinoblastoma (Rb) protein family and the Checkpoint kinase 1 (Chk1) pathway in neuronal cell-cycle progression and survival.

Main Methods:

  • Acute inactivation of Rb family proteins (Rb, p107, p130) in mouse postmitotic neurons.
  • Induction of S-phase progression and subsequent cell death.
  • Analysis of Chk1 pathway activation in response to Rb family inactivation, oxygen-glucose deprivation (OGD), and in vivo hypoxia-ischemia.
  • Investigation of the role of DNA methyltransferase Dnmt1 in protecting cortical neurons during neurogenesis.

Main Results:

  • Acute inactivation of Rb family proteins in postmitotic neurons led to cell death following S-phase progression.
  • Activation of the Chk1 pathway during S phase prevented cell death and enabled cortical neuron division after Rb inactivation, OGD, or hypoxia-ischemia.
  • During neurogenesis, cortical neurons are protected from S-phase Chk1 activation by Dnmt1, leading to cell death after S-phase progression.

Conclusions:

  • Chk1 pathway activation can override intrinsic mitotic safeguards in neurons.
  • The Chk1 pathway plays a critical role in determining neuronal fate after cell-cycle re-entry and injury.
  • Understanding these mechanisms may offer therapeutic targets for neurological disorders involving neuronal loss.