GAS5 Inhibits Gastric Cancer Cell Proliferation Partly by Modulating CDK6
Xiaoqiang Guo1, Kaiyuan Deng, Hao Wang
1Department of General Surgery, Nanjing Medical University Affiliated Wuxi Second Hospital, Wuxi, China.
Introduction:
As it is not clear whether growth arrest-specific 5 (GAS5) inhibits gastric cancer (GC) cell proliferation by regulating cell cycle, we analyzed the effect of GAS5 on cell cycle regulation of GC cells and explored the underlying mechanism.
Methods:
We measured GAS5 levels in GC tissues and corresponding normal tissues, and analyzed the role of GAS5 in regulation of cell proliferation and cell cycle in GC cells using CCK-8 assay and flow cytometry. We also measured the expression of P21 and CDK6 proteins after transfection of AGS and MGC-803 cells with pLJM-GAS5 and GAS5 siRNA, respectively, by western blotting.
Results:
GAS5 expression was significantly lower in GC tissues relative to normal tissues, and its lower expression was correlated with larger tumor size and a more advanced clinical stage of GC. GAS5 induced growth arrest of GC cells through inhibition of G1-S phase translation. The action of GAS5 may be mediated by upregulation of P21 and suppression of CDK6.
Conclusion:
These data enhance our understanding of the important role that GAS5 plays in the molecular etiology of GC and suggest a potential of GAS5 as a new therapeutic target for GC treatment.
Insights
Growth arrest-specific 5 (GAS5) is downregulated in gastric cancer (GC) and inhibits GC cell proliferation by arresting the cell cycle. GAS5 may serve as a novel therapeutic target for GC treatment.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- The role of growth arrest-specific 5 (GAS5) in gastric cancer (GC) cell proliferation and its mechanism involving cell cycle regulation remain unclear.
- Investigating GAS5's function is crucial for understanding GC pathogenesis.
Purpose of the Study:
- To analyze the effect of GAS5 on cell cycle regulation in GC cells.
- To explore the underlying molecular mechanisms of GAS5's action in GC.
Main Methods:
- GAS5 expression levels were measured in GC tissues and adjacent normal tissues.
- Cell proliferation and cell cycle progression were assessed using CCK-8 assays and flow cytometry.
- Protein expression of P21 and CDK6 was evaluated via western blotting after GAS5 manipulation.
Main Results:
- GAS5 expression was significantly reduced in GC tissues compared to normal tissues.
- Lower GAS5 expression correlated with larger tumor size and advanced clinical stage.
- GAS5 induced GC cell growth arrest by inhibiting G1-S phase transition, potentially via P21 upregulation and CDK6 suppression.
Conclusions:
- GAS5 plays a significant role in the molecular etiology of gastric cancer.
- GAS5 demonstrates potential as a novel therapeutic target for GC treatment.
More Related Videos
Related Concept Videos
02:34Inhibition of Cdk Activity
02:34Inhibition of CDK Activity
01:09GPCRs Regulate Adenylyl Cylase Activity
02:53Adaptive Mechanisms in Cancer Cells
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
01:23Negative Regulator Molecules
02:38Mitogens and the Cell Cycle