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Updated: Jul 14, 2026

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
08:33

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis

Published on: December 5, 2017

Different thresholds of MPF inactivation are responsible for controlling different mitotic events in mammalian cell

Naihan Xu1, Donald C Chang

  • 1Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.

Cell Cycle (Georgetown, Tex.)
|June 30, 2007
PubMed

Insights

Maturation-promoting factor (MPF) activity, controlled by cyclin B1 degradation, acts as a master signal during cell division. Different cyclin B1 thresholds quantitatively control key mitotic events like chromosome separation and nuclear reassembly.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Cell division is a fundamental biological process.
  • Temporal regulation of mitotic events is crucial for successful cell division.
  • MPF (Maturation-promoting factor) is a key regulator of mitosis.

Purpose of the Study:

  • To investigate the role of decreasing MPF activity as a master signal in cell division.
  • To quantitatively determine the thresholds of cyclin B1 levels for different mitotic events.
  • To elucidate the temporal control mechanism of successive mitotic events.

Main Methods:

  • Single-cell analysis was employed to measure the kinetics of cyclin B1 degradation.
  • Quantitative measurements of cyclin B1 concentrations were performed.
  • Thresholds for chromosome separation, cytokinesis, and nuclear reassembly were determined.

Main Results:

  • Cyclin B1 degradation kinetics were measured in HeLa cells.
  • Specific cyclin B1 thresholds were identified for key mitotic events: chromosome separation (1.36 ± 0.49 μM), cytokinesis (0.75 ± 0.08 μM), and nuclear reassembly (0.54 ± 0.16 μM).
  • The average endogenous cyclin B1 concentration during prometaphase was 2.92 ± 1.7 μM.

Conclusions:

  • Decreasing MPF activity, driven by cyclin B1 degradation, serves as a master signal orchestrating cell division.
  • The identified quantitative thresholds of cyclin B1 levels are critical for initiating successive mitotic events in a specific order.
  • This paradigm highlights the precise temporal control mechanisms governing cell division progression.

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