Abstract
Mucin-1 (MUC1) affects cancer progression in lung adenocarcinoma, and its aberrant expression pattern has been correlated with poor tumor differentiation and impaired prognosis. In this study, the immunohistochemical expression of MUC1 and Mucin-4 (MUC4) was analyzed in a series of 106 surgically operated stage I–IV pulmonary adenocarcinomas. MUC1 immunohistochemistry was evaluated according to the Nagai classification, and the immunohistochemical profile of the tumors was correlated with detailed clinical and histological data. The effect of cigarette smoke on MUC1 expression in lung cancer cell lines was examined using real-time quantitative reverse transcription polymerase chain reaction (RT-qPCR) and immunoelectron microscopy (IEM). In contrast to the normal apical localization of MUC1, a basolateral and cytoplasmic (depolarized) MUC1 expression pattern was frequently encountered in the high-grade subtypes, i.e., solid predominant adenocarcinoma and the cribriform variant of acinar predominant adenocarcinoma (p < 0.001), and was rarely observed in tumors containing a non-predominant lepidic component (p < 0.001). Furthermore, the altered staining pattern of MUC1 correlated with stage (p = 0.002), reduced overall survival (p = 0.031), and was associated with smoking (p < 0.001). When H1650 adenocarcinoma cells were exposed to cigarette smoke and analyzed by RT-qPCR and IEM, the levels of the MUC1 transcript and protein were elevated (p = 0.042). In conclusion, MUC1 participates in the pathogenesis of lung adenocarcinoma and associates with smoking both in vitro and in vivo. In lung adenocarcinoma, depolarized MUC1 protein expression correlated with histological growth patterns, stage, and patient outcome.
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The study has been supported by the Foundation of the Finnish Anti-Tuberculosis Association, the Jalmari and Rauha Ahokas Foundation, the National Graduate School of Clinical Investigation, the Northern Finland Cancer Foundation, the Otto A. Malm Foundation, the Väinö and Laina Kivi Foundation, and the state subsidy for the University Hospital of Oulu. We thank Ms. Riitta Vuento and the Biocenter Oulu EM laboratory staff for technical assistance and Dr. Ewen MacDonald for the language revision.
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Ethical approval for the study was obtained from the Ethical Committee of the Northern Ostrobothnia Hospital District in Oulu (statement 2/2008) and from the National Supervisory Authority for Welfare and Health (formerly the National Authority of Medicolegal Affairs, reg. no. 863/04/047/08).
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Elisa Lappi-Blanco and Johanna M. Mäkinen has equal contribution.
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Lappi-Blanco, E., Mäkinen, J.M., Lehtonen, S. et al. Mucin-1 correlates with survival, smoking status, and growth patterns in lung adenocarcinoma. Tumor Biol. 37, 13811–13820 (2016). https://doi.org/10.1007/s13277-016-5269-6
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DOI: https://doi.org/10.1007/s13277-016-5269-6