Abstract
Melanoma is one of the most aggressive and drug-resistant cancers. Despite novel promising therapeutic strategies, the prognosis of metastatic melanoma patients remains poor and it is often associated with high relapse rates. Endophilin B1, also known as BIF-1, is a multifunctional protein involved in several biological processes such as autophagy and apoptosis. BIF-1 promotes apoptosis through binding to BAX and its translocation to the mitochondrial outer membrane. On the other hand, BIF-1 can interact with Beclin-1 through UVRAG to promote autophagy. Several reports suggest an ambiguous role of BIF-1 in cancer development and progression. For example, it has been demonstrated that the expression of BIF-1 is reduced in both primary and metastatic melanoma and that the reduction of BIF-1 expression is associated with reduced overall survival of melanoma patients. Here we show that the expression of Beclin-1 and active form of BAX are also reduced in the melanoma patients. However, while we observed strong positive correlations between the expression of BIF-1 and Beclin-1 as well as between BIF-1 and BAX in benign nevi, these correlations were lost in the primary and metastatic melanoma cells. These data indicate disruption in the proximal molecular mechanisms which regulate expression of BIF-1, Beclin-1, and BAX in the primary and metastatic melanoma.
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Acknowledgements
Ž. F. conceived, planned and performed the study, analyzed and interpreted data and wrote the paper. S. M. S. J. performed experiments; R. E. H. took clinical care of the melanoma patients; H. U. S. provided overall guidance, experimental advice, and laboratory infrastructure and edited the paper; all authors read and approved the final manuscript.
Funding
This work was financially supported by the Swiss National Science Foundation (310030_184816 to H. U. S.) and by the European Union Horizon 2020 Research and Innovation Program (Marie Sklodowska-Curie grant no. 642295; MEL-PLEX). Images were acquired on equipment supported by the Microscopy Imaging Centre of the University of Bern.
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The authors declare no conflict of interest in financial or any other sphere. All the procedures carried out in the research with participation of humans were in compliance with the ethical standards of the institutional and/or national ethics committee and with the Helsinki Declaration of 1964 and its subsequent changes or with comparable ethics standards. Informed voluntary consent was obtained from every participant of the study.
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Frangež, Ž., Seyed Jafari, S.M., Hunger, R.E. et al. Loss of Concurrent Regulation of the Expression of BIF-1, BAX, and Beclin-1 in Primary and Metastatic Melanoma. Biochemistry Moscow 85, 1227–1234 (2020). https://doi.org/10.1134/S0006297920100107
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DOI: https://doi.org/10.1134/S0006297920100107