A Haspin-ARHGAP11A axis regulates epithelial morphogenesis through Rho-ROCK dependent modulation of LIMK1-Cofilin
Roberto Quadri1, Giuseppe Rotondo1, Sarah Sertic1
1Department of Biosciences, University of Milan, via Celoria 26, 20133 Milan, Italy.
Iscience
|October 16, 2023
Summary
Haspin, a key mitosis protein, unexpectedly regulates spindle orientation by controlling actin dynamics via the Rho-ROCK-LIMK1 pathway. This finding is crucial for establishing functional tissue morphology during cell division.
Area of Science:
- Cell Biology
- Molecular Biology
- Developmental Biology
Background:
- Mitosis requires coordinated processes for cell proliferation and tissue function.
- Spindle orientation, crucial for tissue morphology, depends on actin dynamics regulated by the LIMK1-Cofilin axis.
- Haspin kinase is known for ensuring faithful chromosome segregation.
Purpose of the Study:
- To investigate the role of Haspin in determining mitotic spindle orientation.
- To elucidate the molecular pathway by which Haspin influences spindle orientation.
Main Methods:
- Investigated Haspin's role in mitosis using cell culture models.
- Utilized 3D cell cultures to assess tissue morphology.
- Examined the regulation of Rho-ROCK, LIMK1, and actin cytoskeleton dynamics.
Main Results:
- Identified a novel role for Haspin in regulating spindle orientation during mitosis.
- Demonstrated that Haspin controls Rho-ROCK activity via ARHGAP11A.
- Showed that ROCK activates LIMK1, stabilizing the actin cytoskeleton for proper spindle orientation.
Conclusions:
- Haspin plays an unprecedented role in mitotic spindle orientation.
- The Haspin-ARHGAP11A-ROCK-LIMK1 pathway is essential for functional spindle orientation and tissue morphology.
- This pathway is pivotal for establishing morphologically functional tissues.
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