DNA damage-inducible gene, UNC5A, functions as a tumor-suppressor in bladder cancer
Abstract:
UNC5 receptors are putative tumor suppressors whose expressions are lost in some cancers, but the role of UNC5A during DNA damage in bladder cancer remains undefined. To investigate into the potential function of UNC5A in bladder cancer, we examined UNC5A expression with real-time RT-PCR and Western blotting in bladder cancer specimens and analyzed the effects of chemotherapeutic drug on the expression level of UNC5A and knocking down of UNC5A on chemotherapeutic drug-mediated cell death. In this current study, we found low expression of UNC5A in bladder cancer, an effective induction of UNC5A by cisplatin in bladder cancer cell lines with wt p53, and a significant reduction of cisplatin-mediated cell death following silencing the endogenous UNC5A. Moreover, colony formation assay indicated that reexpression of UNC5A inhibited the survival of 5637 cells. Together, these data suggest an important role for UNC5A, a candidate tumor suppressor, in predicting response to DNA damage induced by chemotherapeutic drug and regulating cell death in bladder cancer.
Insights
UNC5A, a potential tumor suppressor, is underexpressed in bladder cancer. Its induction by cisplatin enhances chemotherapy-induced cell death, suggesting its role in DNA damage response.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- UNC5 receptors are implicated as tumor suppressors, with expression loss observed in various cancers.
- The specific role of UNC5A in bladder cancer, particularly concerning DNA damage response, remains largely uncharacterized.
Purpose of the Study:
- To investigate the expression patterns of UNC5A in bladder cancer.
- To determine the effect of chemotherapeutic agents on UNC5A expression.
- To elucidate the role of UNC5A in chemo-drug-mediated cell death in bladder cancer.
Main Methods:
- Real-time RT-PCR and Western blotting were employed to assess UNC5A expression in bladder cancer tissues.
- Bladder cancer cell lines were treated with chemotherapeutic drugs to analyze UNC5A expression changes.
- UNC5A was silenced (knocked down) to evaluate its impact on cisplatin-induced cell death.
- Colony formation assays assessed cell survival following UNC5A re-expression.
Main Results:
- A low expression level of UNC5A was observed in bladder cancer specimens.
- Cisplatin effectively induced UNC5A expression in bladder cancer cell lines with wild-type p53.
- Silencing endogenous UNC5A significantly reduced cisplatin-mediated cancer cell death.
- Re-expression of UNC5A inhibited the survival of 5637 bladder cancer cells.
Conclusions:
- UNC5A functions as a candidate tumor suppressor in bladder cancer.
- UNC5A expression is associated with the response to DNA damage induced by chemotherapeutic drugs.
- UNC5A plays a crucial role in regulating cell death pathways in bladder cancer.
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