Abstract
Predicting tumor metastatic potential remains a challenge in cancer research and in clinical diagnosis. Cancer invasion to neighboring tissues is a significant event in cancer progression to metastasis. Optical redox imaging (ORI) is based on detecting the endogenous fluorescence signals of reduced nicotinamide adenine dinucleotide (NADH) and oxidized flavin adenine dinucleotide (FAD). Previously, we found that ORI can discriminate between cancer and normal tissue specimens from clinical breast cancer patients and can differentiate the relative invasiveness of melanoma and breast tumors. In this study, we aimed to identify ORI biomarkers to differentiate the invasiveness of four triple-negative breast cancer cell lines (TNBC). Using a fluorescence microscope, we acquired NADH and FAD fluorescent signals from cultured MDA-MB-231, MDA-MB-436, HCC1806, and MDA-MB-468 cells. We found that (1) the redox ratio, FAD/(NADH+FAD), differentiated the four TNBC lines; (2) there was a significant difference of invasive potential between MDA-MB-231 and the other three TNBC lines measured by the transwell invasion assay; and (3) there was a positive logarithmic correlation between the redox ratio and the invasive potential, where the most invasive MDA-MB-231 cells had the highest redox ratio and the least invasive MDA-MB-468 cells had the lowest redox ratio. These results suggest that the redox ratio can potentially be used as a biomarker for TNBC invasiveness and prognosis.
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Acknowledgments
This work was supported by the NIH Grant R01CA191207 (Li LZ). We thank Allison Podsednik for proofreading the manuscript. We also thank the Cell and Developmental Biology (CDB) Microscopy Core, Perelman School of Medicine, University of Pennsylvania.
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Feng, M., Xu, H.N., Jiang, J., Li, L.Z. (2021). Potential Biomarker for Triple-Negative Breast Cancer Invasiveness by Optical Redox Imaging. In: Nemoto, E.M., Harrison, E.M., Pias, S.C., Bragin, D.E., Harrison, D.K., LaManna, J.C. (eds) Oxygen Transport to Tissue XLII. Advances in Experimental Medicine and Biology, vol 1269. Springer, Cham. https://doi.org/10.1007/978-3-030-48238-1_39
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