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Tumor suppressor function of Rab25 in triple-negative breast cancer
Ji-Ming Cheng1, Lisa Volk, Deepak Kumar Mummidavarapu Janaki
1Division of Hematology and Oncology, Department of Internal Medicine, Southern Illinois University School of Medicine and SimmonsCooper Cancer Institute at SIU, Springfield, IL 62794-9678, USA.
Abstract:
Rab proteins are a group of ubiquitously expressed proteins that are responsible for intracellular transport of vesicles. Recent evidence has shown that certain Rab proteins are involved in the pathogenesis of cancer. We have recently shown that Rab25 is lost in a large fraction of breast cancer samples, particularly those derived from hormonally insensitive tumors. We have further investigated the role of Rab25 by re-expressing Rab25 in tumorigenic cell lines and measuring the impact on tumor formation as well as on various molecular pathways through PCR array analysis. In vivo tumor growth of cell lines with re-expressed Rab25 was markedly suppressed. Our data suggest that Rab25 acts through multiple pathways to enhance apoptosis and to suppress angiogenesis and invasion by modulating VEGF-A and VEGFR-1 expression. These findings suggest that Rab25 represents a novel class of cellular modulators that can influence both tumor initiation and the progression of the established tumors, thus ultimately affecting the biology of the malignant disease.
Insights
Rab25 protein loss is linked to aggressive breast cancer. Re-expressing Rab25 suppressed tumor growth by promoting apoptosis and inhibiting angiogenesis and invasion, suggesting its potential as a therapeutic target.
Area of Science:
- Molecular biology
- Cancer research
- Cellular transport
Background:
- Rab proteins regulate intracellular vesicle transport.
- Aberrant Rab protein expression is implicated in cancer development.
- Rab25 is frequently lost in breast cancer, especially in hormone-insensitive subtypes.
Purpose of the Study:
- To investigate the functional role of Rab25 in breast cancer.
- To determine the impact of Rab25 re-expression on tumor formation and molecular pathways.
Main Methods:
- Re-expression of Rab25 in tumorigenic breast cancer cell lines.
- In vivo tumor growth assays.
- Quantitative PCR (qPCR) array analysis for molecular pathway assessment.
Main Results:
- Re-expression of Rab25 significantly suppressed in vivo tumor growth.
- Rab25 modulated multiple pathways, enhancing apoptosis.
- Rab25 suppressed angiogenesis and invasion by regulating VEGF-A and VEGFR-1 expression.
Conclusions:
- Rab25 acts as a tumor suppressor in breast cancer.
- Rab25 influences both tumor initiation and progression.
- Rab25 represents a novel therapeutic target for breast cancer treatment.
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