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IQGAP1 silencing suppresses the malignant characteristics of laryngeal squamous cell carcinoma cells.

BACKGROUND: Laryngeal squamous cell carcinoma (LSCC) has a poor prognosis due to recurrence and metastasis. IQ-domain GTPase-activating protein 1 (IQGAP1), a scaffold protein, plays an important role in tumorigenesis and malignant development. In this study, we aimed to explore the role of IQGAP1 in LSCC.

METHODS: Expression of IQGAP1 in human LSCC specimens was assessed by immunohistochemistry. We also evaluated the roles of IQGAP1 in cell proliferation, migration and invasion and epithelial-to-mesenchymal transition (EMT) in Hep-2 cells.

RESULTS: The expression of IQGAP1 protein was significantly up-regulated in LSCC tissues compared with normal laryngeal tissues (p = 0.002). Furthermore, the knockdown of IQGAP1 in Hep-2 cells inhibited cell growth, migration and invasion. Moreover, we found that IQGAP1 silencing reversed EMT.

CONCLUSIONS: These results show for the first time that IQGAP1 is up-regulated in LSCC tissues and plays an important role in LSCC cell proliferation and invasiveness, which indicates that IQGAP1 could work as an oncogene and may serve as a promising molecular target for treatment of LSCC.

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