The tumor suppressive roles of ARHGAP25 in lung cancer cells
1Department of Thoracic Surgery, Cancer Hospital of China Medical University, Liaoning Cancer Hospital and Institute, Shenyang, Liaoning Province, People's Republic of China.
Aim:
Several Rho GTPase-activating proteins (Rho GAPs) have been proved to serve as tumor suppressors in diverse human cancers. Among them, ARHGAP25 has also been found to be associated with hematopoietic cells and regulate phagocytosis. Little is known about the role of ARHGAP25 in lung cancer cells.
Methods:
Quantitative real-time PCR and Western blot were used to measure the expression levels of ARHGAP25. The ability of cell growth and mobility were measured by cell proliferation and Transwell assays. Chromatin immunoprecipitation and luciferase assay were conducted to identify the transcriptional regulation.
Results:
Lung cancer tissues had much lower expression level of ARHGAP25 compared to non-cancerous specimens as well as for lung cancer cells. Cell growth and mobility were strongly reduced when ARHGAP25 was overexpressed. Further, significantly negative correlation between ARHGAP25 expression and Wnt signaling pathway was observed. Overexpression of ARHGAP25 reduced the expression of β-catenin and matrix metalloproteinase-7. ARHGAP25 knockdown effect of increased abilities of cell proliferation, migration and invasion could be reversed by adding XAV939 inhibitor. The promoter site of ARHGAP25 could be bound with HOXA4. HOXA4 could regulate the transcriptional activity of ARHGAP25.
Conclusions:
This study suggests that ARHGAP25 may inhibit lung cancer cell growth, migration and invasion through Wnt/β-catenin signaling pathway and its transcriptional activity can be regulated by HOXA4.
Insights
ARHGAP25 acts as a tumor suppressor in lung cancer by inhibiting cell growth and migration via the Wnt/β-catenin pathway. Its activity is regulated by HOXA4, offering potential therapeutic targets for lung cancer.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Rho GTPase-activating proteins (Rho GAPs) function as tumor suppressors in various cancers.
- ARHGAP25 is known to be involved in hematopoietic cells and phagocytosis.
- The specific role of ARHGAP25 in lung cancer remains largely unexplored.
Purpose of the Study:
- To investigate the role of ARHGAP25 in lung cancer.
- To elucidate the mechanism by which ARHGAP25 affects lung cancer cell behavior.
- To identify regulatory factors of ARHGAP25 expression.
Main Methods:
- Quantitative real-time PCR and Western blot for expression analysis.
- Cell proliferation and Transwell assays for cell growth and mobility.
- Chromatin immunoprecipitation and luciferase assays for transcriptional regulation studies.
Main Results:
- ARHGAP25 expression is significantly lower in lung cancer tissues and cells.
- Overexpression of ARHGAP25 inhibits lung cancer cell growth, migration, and invasion.
- ARHGAP25 negatively correlates with the Wnt/β-catenin signaling pathway, reducing β-catenin and MMP-7 expression.
- HOXA4 binds to the ARHGAP25 promoter and regulates its transcriptional activity.
Conclusions:
- ARHGAP25 functions as a tumor suppressor in lung cancer.
- ARHGAP25 inhibits lung cancer cell growth, migration, and invasion, potentially through the Wnt/β-catenin signaling pathway.
- HOXA4 is identified as a transcriptional regulator of ARHGAP25.
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