Abstract
Tumor cell extravasation through the endothelial barrier forming the microvessel wall is a crucial step during tumor metastasis. However, where, how and how fast tumor cells transmigrate through endothelial barriers remain unclear. Using an in vitro transwell model, we performed a transmigration assay of malignant breast tumor cells (MDA-MB-231) through brain and lung microvascular endothelial monolayers under control and pathological conditions. The locations and rates of tumor cell transmigration as well as the changes in the structural components (integrity) of endothelial monolayers were quantified by confocal microscopy. Endothelial monolayer permeability to albumin P albumin was also quantified under the same conditions. We found that about 98% of transmigration occurred at the joints of endothelial cells instead of cell bodies; tumor cell adhesion and transmigration degraded endothelial surface glycocalyx and disrupted endothelial junction proteins, consequently increased P albumin; more tumor cells adhered to and transmigrated through the endothelial monolayer with higher P albumin; P albumin and tumor transmigration were increased by vascular endothelial growth factor, a representative of cytokines, and lipopolysaccharides, a typical systemic inflammatory factor, but reduced by adenosine 3′,5′-cyclic monophosphate. These results suggest that reinforcing endothelial structural integrity is an effective approach for inhibiting tumor extravasation.
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This work was supported by the NIH/NCI Grant SC1CA153325-01.
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Associate Editor Scott I. Simon oversaw the review of this article.
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Fan, J., Fu, B.M. Quantification of Malignant Breast Cancer Cell MDA-MB-231 Transmigration Across Brain and Lung Microvascular Endothelium. Ann Biomed Eng 44, 2189–2201 (2016). https://doi.org/10.1007/s10439-015-1517-y
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DOI: https://doi.org/10.1007/s10439-015-1517-y