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RanGTPase: a candidate for Myc-mediated cancer progression
Hiu-Fung Yuen1, Vignesh-Kumar Gunasekharan, Ka-Kui Chan
1Center for Cancer Research and Cell Biology, Queen's University of Belfast, Belfast, BT9 7BL, UK.
Journal of the National Cancer Institute
|March 8, 2013
Summary
The v-myc myelocytomatosis viral oncogene homolog (Myc) drives cancer progression by increasing Ras-related nuclear protein (Ran) expression. Targeting Ran may be a therapeutic strategy for Myc-driven cancers.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Genetics
Background:
- Ras-related nuclear protein (Ran) is crucial for cancer cell survival and progression.
- The precise molecular mechanisms underlying Ran's role in cancer are not fully understood.
Purpose of the Study:
- To investigate the effect of v-myc myelocytomatosis viral oncogene homolog (Myc) on Ran expression.
- To determine the impact of Myc and Ran on cancer cell behavior.
- To analyze the clinical relevance of Myc and Ran expression in patient cohorts.
Main Methods:
- Western blot, chromatin immunoprecipitation, and luciferase reporter assays to assess Myc-Ran interactions.
- Soft-agar, cell adhesion, and invasion assays to evaluate cancer cell phenotypes.
- Analysis of 14 patient cohorts (n=2430) for Myc-Ran correlation and survival association.
Main Results:
- Myc directly binds to and activates the Ran promoter, upregulating Ran expression.
- Overexpression of Myc or Ran correlates with increased breast cancer progression and metastasis.
- Knockdown of Ran mitigates the pro-cancer effects of Myc overexpression.
- A positive correlation between Myc and Ran expression was observed in breast and lung cancer specimens.
- Ran expression levels predict survival outcomes in patients with high Myc expression.
Conclusions:
- Ran is essential for Myc-driven cancer progression.
- Ran represents a potential therapeutic target for breast and lung cancers driven by Myc.
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