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Differential expression of aquaporin 5 and aquaporin 3 in squamous cell carcinoma and adenoid cystic carcinoma

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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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Document Type: Research Article

Affiliations: 1: Department of Pharmacology, Graduate School of Dentistry, Osaka University, Osaka 565-0871, Japan 2: Clinical Laboratory, Osaka University Dental Hospital, Suita, Osaka 565-0871, Japan 3: The First Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, Osaka 565-0871, Japan 4: Department of Gastroenterology, Yokohama City University School of Medicine, Yokohama 236-0004, Japan

Publication date: January 1, 2012

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  • The International Journal of Oncology provides an international forum for the publication of the latest, cutting-edge research in the broad area of oncology and cancer treatment. The journal accepts original high quality works and reviews on all aspects of oncology research including carcinogenesis, metastasis, epidemiology, chemotherapy and viral oncology. Through fair and efficient peer review, the journal is dedicated to publishing top tier research in the field, offering authors rapid publication as well as high standards of copy-editing and production. The International Journal of Oncology is published on a monthly basis in both print and early online.
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