RhoC Modulates Cell Junctions and Type I Interferon Response in Aggressive Breast Cancers
Hannah G Abraham1, Peter J Ulintz1, Laura Goo1
1Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States.
Frontiers in Oncology
|September 13, 2021
Summary
RhoC GTPase promotes cancer metastasis by disrupting cell-cell junctions. Inhibiting RhoC normalizes these junctions, reduces invasion, and offers a potential therapeutic strategy for aggressive breast cancer.
Area of Science:
- Oncology
- Cell Biology
- Molecular Biology
Background:
- Metastasis is the primary cause of cancer mortality.
- RhoC GTPase influences cancer cell motility, invasion, and chemokine secretion.
- Dysregulated cell-cell junctions are characteristic of metastatic cells.
Purpose of the Study:
- To investigate the role of RhoA and RhoC GTPases in aggressive breast cancer cell-cell junctions.
- To elucidate the precise mechanism by which RhoC promotes metastasis.
Main Methods:
- CRISPR-Cas9 gene editing to knockout RhoC in breast cancer cell lines (SUM 149, MDA 231).
- Assessment of junctional integrity, protein expression, and colocalization.
- Functional assays for barrier integrity and cell-cell adhesion.
- Whole exome RNA sequencing and gene expression profiling.
- Interferon-alpha stimulation experiments.
Main Results:
- RhoC knockout led to normalized junctional integrity and increased barrier integrity and cell-cell adhesion.
- RhoC knockout cells showed decreased expression of Type I interferon-stimulated genes.
- Interferon-alpha treatment reduced invasiveness and increased adhesion in wild-type cells.
- RhoC knockout cells exhibited a diminished response to interferon-alpha stimulation.
Conclusions:
- RhoC GTPase plays a critical role in modulating cell-cell junctions and response to interferon signaling in aggressive breast cancer.
- Targeting RhoC represents a promising therapeutic strategy to inhibit cancer invasion and metastasis.
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