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RhoJ interacts with the GIT-PIX complex and regulates focal adhesion disassembly
Eleanor Wilson1, Katarzyna Leszczynska1, Natalie S Poulter2
1School of Immunity and Infection, Institute for Biomedical Research, The Medical School, University of Birmingham, Birmingham B15 2TT, UK.
Journal of Cell Science
|June 15, 2014
Summary
RhoJ, a Rho GTPase, controls cell movement and focal adhesion dynamics. This study reveals RhoJ
Area of Science:
- Cell Biology
- Molecular Biology
- Cancer Research
Background:
- RhoJ is a Rho GTPase found in endothelial and tumor cells.
- It influences cell motility, invasion, tube formation, and focal adhesions.
Purpose of the Study:
- To further define the molecular mechanisms of RhoJ function.
- To investigate RhoJ's role in focal adhesion dynamics and tumor angiogenesis.
Main Methods:
- Timelapse microscopy to observe focal adhesion disassembly.
- Co-precipitation and yeast two-hybrid assays to identify protein interactions.
- siRNA-mediated knockdown and knockout mouse models.
Main Results:
- RhoJ regulates focal adhesion disassembly; RhoJ knockdown slowed disassembly, while active RhoJ accelerated it.
- RhoJ interacts with the GIT-PIX complex (GIT1, GIT2, β-PIX), which is crucial for focal adhesion.
- RhoJ-knockout mice exhibited reduced tumor growth and angiogenesis.
Conclusions:
- RhoJ is a key regulator of focal adhesion dynamics through interaction with the GIT-PIX complex.
- RhoJ plays a significant role in tumor angiogenesis and growth.
- Understanding RhoJ's function provides insights into cell motility and cancer progression.
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