The unique contributions of Rab11 and Rab35 to the completion of cell division
Paulius Gibieža1, Emilija Ratkevičiūtė2, Girstautė Dabkevičiūtė2
1Laboratory of Drug Targets Histopathology, Institute of Cardiology, Lithuanian University of Health Sciences, Sukilėlių Av. 13, 50162, Kaunas, Lithuania. paulius.gibieza@lsmu.lt.
Biological Research
|August 28, 2025
Summary
Rab11 and Rab35 proteins are crucial for cell division, but their distinct roles in cancer cell cytokinesis and abscission are unclear. This study reveals their interrelated expression and unique functions, with depletion causing defects and actin accumulation.
Area of Science:
- Cell Biology
- Molecular Biology
- Cancer Research
Background:
- Rab11 and Rab35 are involved in intracellular membrane trafficking during late cell cycle stages.
- Both proteins are linked to cytokinetic abscission but have distinct functions and cellular phenotypes.
- Limited research exists on the comparative roles of Rab11 and Rab35 in cancer cell division.
Purpose of the Study:
- To systematically compare the functions of Rab11 and Rab35 in cancer cell division.
- To elucidate the interrelationship and potential compensatory mechanisms between Rab11 and Rab35.
- To understand how these Rab proteins orchestrate late mitotic progression and cytokinesis completion.
Main Methods:
- Analysis of Rab11a, Rab11b, and Rab35 expression levels.
- Investigating the impact of Rab11 and Rab35 depletion on mitotic progression and cytokinetic abscission.
- Examining F-actin accumulation at the intercellular bridge.
- Assessing rescue effects of overexpressing related Rab proteins.
Main Results:
- Rab11a, Rab11b, and Rab35 exhibit partially interrelated expression patterns.
- Rab11 and Rab35 play distinct roles in mitotic progression, especially during M-phase.
- Depletion of Rab11 or Rab35 impairs cytokinetic abscission and leads to F-actin accumulation.
- Overexpression of related Rabs does not rescue defects caused by Rab11/Rab35 downregulation.
Conclusions:
- Rab11 and Rab35 have distinct, non-compensatory roles in cancer cell cytokinesis.
- Aberrant F-actin accumulation is a consequence of Rab11/Rab35 dysfunction during abscission.
- Further understanding of Rab11 and Rab35 is critical for deciphering cancer cell division mechanisms.
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