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Procoagulant tumor microvesicles attach to endothelial cells on biochips under microfluidic flow

Algarni, Abdulrahman; Greenman, John; Madden, Leigh A.

Authors

Abdulrahman Algarni



Abstract

Tumor patients are at a high risk of venous thromboembolism (VTE), and the mechanism by which this occurs may involve tumor-derived microvesicles (MVs). Previously, it has been shown that tumor MVs become attached to endothelial cells in static conditions. To investigate whether this process occurs under physiologically relevant flow rates, tumor MVs were perfused across a microfluidic device coated with growing human umbilical vein endothelial cells (HUVECs). Cell lines were screened for their ability to form tumor spheroids, and two cell lines, ES-2 and U87, were selected; spheroids formed were transferred to a microfluidic chip, and a second endothelial cell biochip was coated with HUVECs and the two chips were linked. Media flowed through the spheroid chip to the endothelial chip, and procoagulant activity (PCA) of the tumor media was determined by a one-stage prothrombin time assay. Tumor MVs were also quantified by flow cytometry before and after interaction with HUVECs. Confocal images showed that HUVECs acquired fluorescence from MV attachment. Labeled MVs were proportionally lost from MV rich media with time when flowed over HUVECs and were not observed on a control chip. The loss of MV was accompanied by a proportional reduction in PCA. Flow cytometry, confocal microscopy, and live flow imagery captured under pulsatile flow confirmed an association between tumor MVs and HUVECs. Tumor MVs attached to endothelial cells under physiological flow rates, which may be relevant to the VTE pathways in cancer patients.

Journal Article Type Article
Publication Date 2019-11
Journal Biomicrofluidics
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 13
Issue 6
Article Number 064124
APA6 Citation Algarni, A., Greenman, J., & Madden, L. A. (2019). Procoagulant tumor microvesicles attach to endothelial cells on biochips under microfluidic flow. Biomicrofluidics, 13(6), https://doi.org/10.1063/1.5123462
DOI https://doi.org/10.1063/1.5123462
Keywords Physical and Theoretical Chemistry; General Materials Science; Genetics; Molecular Biology; Condensed Matter Physics
Additional Information Received: 2019-08-07; Accepted: 2019-11-22; Published: 2019-12-06
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