Abstract
Endophilin B1, also known as BAX-interacting protein 1 (BIF-1), is part of the endophilin B protein family, and is a multifunctional protein involved in the regulation of apoptosis, autophagy, and mitochondrial morphology. The role of BIF-1 in cancer is controversial since previous reports indicated to both tumor-promoting and tumor-suppressive roles, perhaps depending on the cancer cell type. In the present study, we report that BIF-1 is significantly downregulated in both primary and metastatic melanomas, and that patients with high levels of BIF-1 expression exhibited a better overall survival. Depleting BIF-1 using CRISPR/Cas9 technology in melanoma cells resulted in higher proliferation rates both in vitro and in vivo, a finding that was associated with increased ATP production, metabolic acidification, and mitochondrial respiration. We also observed mitochondrial hyperpolarization, but no increase in the mitochondrial content of BIF-1-knockout melanoma cells. In contrast, such knockout melanoma cells were equally sensitive to anticancer drug- or UV irradiation-induced cell death, and exhibited similar autophagic activities as compared with control cells. Taken together, it appears that downregulation of BIF-1 contributes to tumorigenesis in cutaneous melanoma by upregulating mitochondrial respiration and metabolism, independent of its effect on apoptosis and autophagy.
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Acknowledgements
This work was supported by the Swiss National Science Foundation (310030_184816 to H.U.S.) and the European Union Horizon 2020 Research and Innovation Program (Marie Sklodowska-Curie grant No. 642295; MEL-PLEX). Ž.F. is a PhD student of the Graduate School of Cellular and Biomedical Sciences of the University of Bern. Images were acquired on equipment supported by the Microscopy Imaging Center of the University of Bern.
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Ž.F. conceived, planned, and performed the study, analyzed and interpreted data, and wrote the paper. Y.F.M., D.S., and S.M.S.J. performed the experiments; R.E.H. took clinical care of the melanoma patients; V.D. supported the electron microscopic analysis; C.R. supported the mouse experiments; H.U.S. provided overall guidance, experimental advice and laboratory infrastructure, and edited the paper; all authors read and approved the final paper.
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Frangež, Ž., Fernández-Marrero, Y., Stojkov, D. et al. BIF-1 inhibits both mitochondrial and glycolytic ATP production: its downregulation promotes melanoma growth. Oncogene 39, 4944–4955 (2020). https://doi.org/10.1038/s41388-020-1339-8
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DOI: https://doi.org/10.1038/s41388-020-1339-8
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