Abstract
Aquaporins (AQPs) are a membrane protein family involved in the selective transport of water across cell membranes. Recent studies have reported the expression of AQP5 in several tumor types such as gastric, pulmonary, ovarian, pancreatic and colorectal cancer. We have previously reported the expression on tumor cells and the important role of AQP3 on cell growth in tongue cancer. However, little is known about the expression and precise role of AQP5 on squamous cell carcinoma (SCC) of the tongue. We investigated the expression of AQP5 and AQP3 in human oral SCC and adenoid cystic carcinoma (ACC). Overexpression of both AQP5 and AQP3 were immunohistochemically observed on tumor cells in SCC, whereas ACC cells were faintly stained with those antibodies against AQPs. Treatment with pan-AQP inhibitor or specific AQP5-siRNA showed inhibition of cell growth in SCC cell lines via the inhibition of integrins and the mitogen-activated protein kinase pathway. AQPs play important roles in cell growth in SCC rather than ACC.
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