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Inhibition of STAT6/Anoctamin-1 Activation Suppresses Proliferation and Invasion of Gastric Cancer Cells.

BACKGROUND: Gastric carcinoma is the most popular cancer worldwide. Anoctamin-1 is a calcium-activated channel and highly expressed in various tumors. A previous study indicated that suppressed Anoctamin-1 expression decreased cancer cell proliferation or migration. As a signal transduction and transcription activator, STAT6 is a novel agonist for Anoctamin-1 promoter. However, its role in tumor cell proliferation or migration remains unclear. Therefore, this study aimed to suppress STAT6 and Anoctamin-1 protein expression in gastric cancer cells to test the inhibitory effects on gastric cancer cell migration or invasion.

MATERIALS AND METHODS: MTT colorimetry was used to test cell proliferation. Western blot was used to measure STAT6 and Anoctamin-1 expression before and after small interfering RNA (siRNA) treatment. A scratch assay was performed to measure cell migration, followed by Transwell chamber assay analysis of cell invasion.

RESULTS: After STAT6 siRNA interference, the expression of STAT6 and Anoctamin-1 was significantly decreased in the gastric carcinoma cell line. Anoctamin-1 siRNA interference only decreased its protein expression, but not STAT6 protein expression. Interference of STAT6 or Anoctamin-1 reduced their protein expression and inhibited proliferation, migration, or invasion of gastric cancer cells.

CONCLUSIONS: Inhibition of STAT6/Anoctamin-1 activation decreased proliferation, migration, or invasion of gastric cancer cells, suggesting that the STAT6/Anoctamin-1 pathway might be a novel target for treating gastric cancer.

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