Abstract
Malignant cells supply their energy needs through increased glucose consumption, producing large quantities of lactic acid via glycolysis. Glucose transporters (GLUTs) and monocarboxylate transporters (MCTs) are therefore commonly up-regulated in human malignancies to mediate glucose influx and lactic acid efflux, respectively. However, their roles in malignant pleural mesothelioma (MPM) have not been fully elucidated. Here, we evaluated GLUT-1, MCT-1, and MCT-4 expression in human MPM and reactive mesothelial hyperplasia (RMH) and elucidated their biological role in vitro. GLUT-1, MCT-1, and MCT-4 expression was determined in human MPM (n = 35) and RMH (n = 20) specimens by immunohistochemistry and in frozen tissue, and MPM cell lines, by real-time reverse transcription-polymerase chain reaction and western blot analysis. GLUT-1, MCT-1, and MCT-4 functions in MPM were evaluated by transfection with small interfering RNA. Immunohistochemical analysis revealed higher levels of GLUT-1, MCT-1, and MCT-4 in MPM than in RMH. Additionally, GLUT-1, MCT-1, and MCT-4 mRNA levels were higher in MPM than in non-neoplastic mesothelial cell lines. The siRNA-mediated knockdown of GLUT-1 or MCT-1 significantly suppressed tumor cell proliferation, and MCT-1 silencing inhibited invasion and induced apoptosis. Taken together, these results indicate that combined application of GLUT-1, MCT-1, and MCT-4 immunohistochemistry might be useful in differentiating MPM from RMH and suggest that MCT-1plays an important biological role.
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Acknowledgments
We acknowledge the expert technical assistance of Ms. M. Onitsuka in immunohistochemical and in vitro studies. This work was supported in part by a grant from the Research Center for Advanced Molecular Medicine, Fukuoka University.
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The authors declare no conflict of interest.
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Mogi, A., Koga, K., Aoki, M. et al. Expression and role of GLUT-1, MCT-1, and MCT-4 in malignant pleural mesothelioma. Virchows Arch 462, 83–93 (2013). https://doi.org/10.1007/s00428-012-1344-6
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DOI: https://doi.org/10.1007/s00428-012-1344-6