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Published on: May 14, 2016
Tumor cell dependence on Ran-GTP-directed mitosis
Fang Xia1, Connie W Lee, Dario C Altieri
1Department of Cancer Biology, Cancer Center, University of Massachusetts Medical School, Worcester, MA 01605, USA.
Cancer Research
|March 15, 2008
Summary
Cancer cells rely on the small GTPase Ran for cell division. Silencing Ran causes cancer cell death without harming normal cells, suggesting Ran as a potential anticancer target.
Area of Science:
- Cell Biology
- Molecular Biology
- Oncology
Background:
- Deregulated cell division is a key characteristic of cancer.
- The specific mitotic mechanisms tumor cells depend on remain largely unknown.
- The role of the small GTPase Ran in cancer cell division requires further investigation.
Purpose of the Study:
- To investigate the role of the small GTPase Ran in cancer cell division.
- To determine if tumor cells become dependent on Ran signaling for mitosis.
- To explore the potential of targeting Ran as a selective anticancer strategy.
Main Methods:
- Differential expression analysis of Ran in human cancer versus normal tissues.
- Acute silencing of Ran in various tumor cell types.
- Assessment of mitotic spindle formation, mitochondrial function, and apoptosis.
- Investigation of the involvement of p53, Bax, Smac, and survivin.
Main Results:
- Ran is differentially overexpressed in human cancers compared to normal tissues.
- Acute Ran silencing in tumor cells leads to aberrant mitosis, mitochondrial dysfunction, and apoptosis.
- This Ran-dependent pathway is independent of p53, Bax, and Smac.
- Survivin is identified as a novel Ran target in cancer cells.
- Normal cells tolerate loss of Ran without adverse effects on viability or mitosis.
Conclusions:
- Tumor cells exhibit a dependency on Ran signaling for successful cell division.
- Targeting the Ran pathway presents a promising strategy for developing novel and selective cancer therapies.
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