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Related Experiment Videos

Changes in Ect2 localization couple actomyosin-dependent cell shape changes to mitotic progression.

Helen K Matthews1, Ulysse Delabre, Jennifer L Rohn

  • 1MRC Laboratory for Molecular Cell Biology, University College London, Gower St., London WC1E 6BT, UK.

Developmental Cell
|August 18, 2012
PubMed
Summary
This summary is machine-generated.

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The cell cycle regulator Ect2 controls animal cell rounding during mitosis by remodeling the actin cytoskeleton. Ect2 activation and localization drive the formation of a stiff cell cortex and the contractile ring for accurate cell division.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Animal cells undergo significant actin-dependent shape changes to round up during mitosis.
  • The cell cycle machinery regulates entry into mitosis and subsequent actin remodeling.
  • Ect2, a RhoGEF, is known to regulate actomyosin contractile ring formation during mitotic exit via RhoA activation.

Purpose of the Study:

  • To identify the regulator of mitotic rounding.
  • To uncover the link between cell-cycle machinery and actin remodeling during mitosis.
  • To elucidate the role of Ect2 in mitotic rounding and cell division.

Main Methods:

  • Investigated Ect2 as a Cdk1 substrate.
  • Analyzed Ect2 localization and activity during different mitotic stages.

Related Experiment Videos

  • Examined RhoA activation and actin cortex organization.
  • Studied the interaction of Ect2 with RacGAP1.

    • Main Results:

    • Ect2 is a key regulator of mitotic rounding.
    • Ect2 becomes active in prophase and is exported from the nucleus.
    • Ect2 activation of RhoA leads to a mechanically stiff metaphase cortex.
    • Ect2 is repositioned by RacGAP1 at anaphase to form the actomyosin ring.

    Conclusions:

    • Ect2 links cell-cycle entry to actin remodeling for mitotic rounding.
    • Stage-specific Ect2 localization orchestrates actin cortex organization for cell division.
    • Ect2's dual role in rounding and cytokinesis highlights its importance in mitosis.