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Regulation of anoikis resistance by NADPH oxidase 4 and epidermal growth factor receptor
Hyeryeong Kim1, Jee Young Sung2, Eun-Kyung Park1
1Comparative Biomedicine Research Branch, Division of Cancer Biology, National Cancer Center, 323 Ilsan-ro, Ilsandong-gu, Goyang-si 410-769, Korea.
Background:
Normal cells are sensitive to anoikis, which is a cell detachment-induced apoptosis. However, cancer cells acquire anoikis resistance that is essential for successful metastasis. This study aimed to demonstrate the function and potential mechanism of NADPH oxidase 4 (NOX4) and EGFR activation in regulating anoikis resistance in lung cancer.
Methods:
Cells were cultured either in the attached or suspended condition. Cell viability was measured by cell counting and live and dead cell staining. Expression levels of NOX4 and EGFR were measured by PCR and immunoblotting. Reactive oxygen species (ROS) levels were measured by flow cytometry. Effects of NOX4 overexpression or NOX4 knockdown by si-NOX4 on anoikis sensitivity were explored. Levels of NOX4 and EGFR in lung cancer tissues were evaluated by IHC staining.
Results:
NOX4 was upregulated but EGFR decreased in suspended cells compared with attached cells. Accordingly, ROS levels were increased in suspended cells, resulting in the activation of Src and EGFR. NOX4 knockdown decreased activation of Src and EGFR, and thus sensitised cells to anoikis. NOX4 overexpression increased EGFR levels and attenuated anoikis. NOX4 expression is upregulated and is positively correlated with EGFR levels in the lung cancer patient tissues.
Conclusions:
NOX4 upregulation confers anoikis resistance by ROS-mediated activation of EGFR and Src, and by maintaining EGFR levels, which is critical for cell survival.
Insights
NADPH oxidase 4 (NOX4) upregulation promotes lung cancer cell survival by enhancing anoikis resistance through reactive oxygen species (ROS)-mediated epidermal growth factor receptor (EGFR) activation and maintenance. This mechanism is crucial for metastasis.
Area of Science:
- Cell biology
- Cancer research
- Molecular oncology
Background:
- Anoikis, a form of apoptosis induced by cell detachment, normally prevents metastasis.
- Cancer cells often develop resistance to anoikis, a critical step for metastatic progression.
- Understanding the molecular mechanisms of anoikis resistance is vital for developing effective lung cancer therapies.
Purpose of the Study:
- To investigate the role of NADPH oxidase 4 (NOX4) and epidermal growth factor receptor (EGFR) activation in anoikis resistance in lung cancer.
- To elucidate the underlying molecular mechanisms by which NOX4 influences anoikis resistance.
Main Methods:
- Cultured lung cells in attached and suspended states to induce or prevent anoikis.
- Quantified cell viability, NOX4 and EGFR expression, and reactive oxygen species (ROS) levels.
- Utilized NOX4 knockdown and overexpression techniques to assess effects on anoikis sensitivity.
- Examined NOX4 and EGFR levels in clinical lung cancer tissues.
Main Results:
- NOX4 expression and ROS levels were elevated in suspended cells, activating Src and EGFR.
- NOX4 knockdown sensitized cells to anoikis by reducing Src and EGFR activation.
- NOX4 overexpression enhanced anoikis resistance and increased EGFR levels.
- Clinical lung cancer tissues showed upregulated NOX4 correlating positively with EGFR levels.
Conclusions:
- NOX4 upregulation confers anoikis resistance in lung cancer cells.
- This resistance is mediated by ROS-dependent activation and maintenance of EGFR and Src signaling.
- Targeting the NOX4-EGFR axis may represent a therapeutic strategy for overcoming lung cancer metastasis.
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