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COX-2 regulates E-cadherin expression through the NF-κB/Snail signaling pathway in gastric cancer
Zhaofeng Chen1, Min Liu, Xiaojun Liu
1Division of Gastroenterology and Hepatology, The First Hospital of Lanzhou University, Lanzhou, Gansu, P.R. China.
Abstract:
Cyclooxygenase-2 (COX-2) participates in cancer invasion and metastasis by decreasing the expression of E-cadherin. However, the molecular mechanisms through which COX-2 regulates E-cadherin expression and function have not yet been fully elucidated. The aim of this study was to investigate the possible molecular mechanisms through which COX-2 regulates E-cadherin expression in gastric cancer. The mRNA and protein expression of COX-2, nuclear factor-κB (NF-κB), Snail and E-cadherin was detected in gastric cancer cells by quantitative PCR and western blot analysis, respectively. The expression of these genes was also detected in healthy gastric mucosa and gastric cancer tissues by immunohistochemistry. We detected various levels of COX-2, nuclear factor-κB (NF-κB), Snail and E-cadherin expression in the normal gastric mucosa and cancer tissues; however, the expression patterns differed: the increased expression of COX-2, NF-κB and Snail was observed in the gastric cancer tissues, whereas there was a considerable reduction in E-cadherin expression in the cancer tissues compared to the normal gastric mucosa. The expression patterns of COX-2, NF-κB and Snail were similar. The increased expression of COX-2 in the gastric cancer tissues closely correlated with the increased expression of NF-κB and Snail, but inversely correlated with the expression of E-cadherin. Treatment of the SGC7901 cells (which express high levels of COX-2) with celecoxib, a COX-2 inhibitor, not only led to a marked dose- and time-dependent decrease in the expression of COX-2, NF-κB and Snail, but also led to a significant increase in the expression of E-cadherin, and this was associated with a reduction in cell invasion. By contrast, the same treatment did not alter the expression of these genes in another gastric cancer cell line, MGC803 (which barely expresses COX-2). These data suggest that COX-2 regulates the expression of E-cadherin through the NF-κB and Snail signaling pathway in gastric cancer.
Insights
Cyclooxygenase-2 (COX-2) promotes gastric cancer invasion by reducing E-cadherin. This study reveals COX-2 regulates E-cadherin via the nuclear factor-κB (NF-κB) and Snail pathway, offering new therapeutic targets.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Cyclooxygenase-2 (COX-2) is implicated in cancer invasion and metastasis.
- COX-2's role in decreasing E-cadherin expression is known, but the precise molecular mechanisms remain unclear.
- Understanding these mechanisms is crucial for developing targeted gastric cancer therapies.
Purpose of the Study:
- To investigate the molecular mechanisms by which COX-2 regulates E-cadherin expression in gastric cancer.
- To elucidate the role of nuclear factor-κB (NF-κB) and Snail in this process.
- To explore potential therapeutic strategies targeting the COX-2 pathway.
Main Methods:
- Quantitative PCR and Western blot analysis to detect gene and protein expression in gastric cancer cells.
- Immunohistochemistry to assess expression levels in normal gastric mucosa and cancer tissues.
- Treatment with celecoxib (a COX-2 inhibitor) to evaluate its effects on gene expression and cell invasion.
Main Results:
- Gastric cancer tissues showed increased expression of COX-2, NF-κB, and Snail, with a corresponding decrease in E-cadherin.
- COX-2 expression positively correlated with NF-κB and Snail, and inversely with E-cadherin.
- Celecoxib treatment reduced COX-2, NF-κB, and Snail, while increasing E-cadherin and decreasing invasion in high-COX-2 cells, with no effect in low-COX-2 cells.
Conclusions:
- COX-2 regulates E-cadherin expression in gastric cancer through the NF-κB and Snail signaling pathway.
- Targeting COX-2 may be a viable strategy to inhibit gastric cancer invasion and metastasis.
- Further research into this pathway could lead to novel therapeutic interventions for gastric cancer.
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