Abstract
Background
The ability of tumor cells to invade and metastasize is relevant to the process of cancer progression and, as such, it represents an obstacle to cancer cure. So far, limited information is available on interactions between circulating tumor cells and blood cells. It is well-documented that galectin-4 is upregulated in many types of tumor cells and is involved in metastasis. Here, we address the hypothesis that tumor cells may interact with red blood cells (RBCs) via galectin-4.
Methods
High galectin-4 expressing colon, normal pancreatic and pancreatic cancer-derived cell lines (n = 5) were incubated with peripheral blood cells from different donors. Their interactions and associated proteins were examined by immunostaining and live cell imaging.
Results
We found that (endogenous or exogenous) galectin-4 expressing tumor cells interact directly with RBCs. We also observed an accumulation of galectin-4 and human blood group antigens at the contact sites between these cells. By comparing the number of RBCs attaching to each tumor cell, we found that cells with high pre-incubation expression levels of galectin-4 attached significantly more RBCs than those with low expression levels (p < 1 × 10−7). Conversely, we found that RBC attachment induces galectin-4 expression in tumor cells.
Conclusions
From our data we conclude that tumor cells directly interact with red blood cells via galectin-4.
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Acknowledgements
The PancoBank (Prof. Dr. M.W. Büchler) is supported by the Heidelberger Stiftung Chirurgie/HSC and the Biomaterial Bank Heidelberg/BMBH (Prof. Dr. P. Schirmacher; BMBF grant 01EY1101). Reham Helwa was funded by the German Cancer Research Center as a visiting scholar. This work was funded by the Deutsche Krebsforschungszentrum (DKFZ), Heidelberg, Germany. Also some experiments were carried out at Ain Shams and Bergen universities.
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Reham Helwa and Anette Heller equally contributing authors.
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Helwa, R., Heller, A., Knappskog, S. et al. Tumor cells interact with red blood cells via galectin-4 - a short report. Cell Oncol. 40, 401–409 (2017). https://doi.org/10.1007/s13402-017-0317-9
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DOI: https://doi.org/10.1007/s13402-017-0317-9