Related Experiment Video
Updated: Apr 17, 2026
The Soft Agar Colony Formation Assay
Published on: October 27, 2014
FoxO6 inhibits cell proliferation in lung carcinoma through up-regulation of USP7
Hong-Jun Hu1, Li-Guo Zhang1, Zhen-Hua Wang1
1Department of Thoracic Tumor Surgery 2, Xinxiang Central Hospital, Xinxiang, Henan 453000, P.R. China.
Abstract:
Emerging evidence has suggested that misregulation of oncogenes and/or tumor suppressors has a crucial role in the development of lung carcinoma. The present study demonstrated that the expression levels of forkhead box O6 (FOXO6) were downregulated in lung cancer tissue samples, as compared with those in adjacent normal tissue. Overexpression of FOXO6 inhibited the proliferation of A549 human lung cancer cells, whereas knockdown of endogenous FOXO6 expression enhanced cell proliferation. Furthermore, ectopic FOXO6 expression induced the expression of ubiquitin-specific-processing protease 7 (USP7). As a result of this regulation, FOXO6 overexpression led to an elevation of p53 protein expression levels in A549 cells. In conclusion, the results of the present study indicated that the FOXO6/USP7 molecular network has an important role in the regulation of lung cancer development.
Insights
Forkhead box O6 (FOXO6) is downregulated in lung cancer. Its overexpression inhibits cancer cell proliferation by regulating the FOXO6/ubiquitin-specific-processing protease 7 (USP7) pathway, impacting p53 levels.
Area of Science:
- Oncology
- Molecular Biology
- Gene Regulation
Background:
- Misregulation of oncogenes and tumor suppressors is implicated in lung carcinoma development.
- The role of forkhead box O6 (FOXO6) in lung cancer pathogenesis requires further elucidation.
Purpose of the Study:
- To investigate the expression and function of FOXO6 in human lung cancer.
- To explore the molecular mechanisms underlying FOXO6's role in lung cancer cell proliferation.
Main Methods:
- Quantitative analysis of FOXO6 expression in lung cancer tissues versus normal adjacent tissues.
- Cell proliferation assays in A549 lung cancer cells following FOXO6 overexpression or knockdown.
- Western blot analysis to assess the expression of USP7 and p53 proteins.
Main Results:
- FOXO6 expression was significantly downregulated in lung cancer tissues compared to normal tissues.
- Overexpression of FOXO6 inhibited A549 cell proliferation, while FOXO6 knockdown enhanced it.
- Ectopic FOXO6 expression upregulated USP7, leading to increased p53 protein levels.
Conclusions:
- FOXO6 acts as a tumor suppressor in lung cancer.
- The FOXO6/USP7 molecular network plays a critical role in regulating lung cancer development.
- Targeting the FOXO6/USP7 pathway may offer therapeutic strategies for lung carcinoma.
More Related Videos
Related Concept Videos
02:23Abnormal Proliferation
03:03mTOR Signaling and Cancer Progression
The mTOR pathway or the...
03:03mTOR Signaling and Cancer Progression
01:12Loss of Tumor Suppressor Gene Functions
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
01:12Loss of Tumor Suppressor Gene Functions
02:07Tumor Progression
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...