Abstract
KAI1 COOH-terminal interacting tetraspanin (KITENIN) contributes to tumor invasion and metastasis in various cancers. The aim of this study was to investigate expression of KITENIN in patients with oral cavity squamous cell carcinoma (SCC) and to determine whether KITENIN affects tumor cell behavior in oral cavity SCC cell line. Western blotting and immunohistochemistry was used to assess alteration of KITENIN expression in human oral cavity SCC and normal oral cavity mucosa. To evaluate the impact of KITENIN knockdown, the cell invasion assay and cell migration assay using small-interfering RNA were performed. KITENIN protein expression was significantly increased in human oral cavity SCC tissues than in normal oral cavity mucosa by Western blotting. KITENIN immunoreactivity was strongly identified in human oral cavity SCC relative to adjacent normal tissue. Knockdown of KITENIN resulted in significantly reduced cell invasion in human oral cavity SCC cells (p=0.001). Cell migration showed a marked decrease in KITENIN knockdown oral cavity SCC cells compared to the negative control oral cavity SCC cells (p=0.01). KITENIN is associated with tumor invasiveness and metastasis in human oral cavity SCC.
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