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2018 ; 2
(10
): 1054-1065
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Analysis of the thrombotic and fibrinolytic activities of tumor cell-derived
extracellular vesicles
#MMPMID29752284
Durrieu L
; Bharadwaj A
; Waisman DM
Blood Adv
2018[May]; 2
(10
): 1054-1065
PMID29752284
show ga
Exosomes and microvesicles (MVs) are small extracellular vesicles secreted by
tumor cells and are suggested to contribute to the thrombotic events that
commonly occur in patients with advanced malignancies. Paradoxically, these
vesicles have been reported to also possess fibrinolytic activity. To determine
whether thrombotic or fibrinolytic activity is a predominant characteristic of
these extracellular vesicles, we prepared exosomes and MVs from 2 breast cancer
cell lines (MDA-MB-231 and MCF7), a lung cancer cell line (A549), and a leukemia
cell line (NB4) and assayed their thrombotic and fibrinolytic activities. We
observed that thrombotic activity was a common feature of MVs but not exosomes.
Exosomes and/or MVs from several cell lines, with the exception of the A549 cell
line, displayed fibrinolytic activity toward a pure fibrin clot, but only
exosomes from MDA-MB-231 cells could degrade a fibrin clot formed in plasma.
Increasing the malignant potential of MCF7 cells decreased the thrombotic
activity of their MVs but did not alter their fibrinolytic activity. Decreasing
the malignant potential of NB4 cells did not alter the thrombotic or fibrinolytic
activity of their MVs or exosomes. Finally, the incubation of MDA-MB-231
cell-derived exosomes with A549 cells increased plasmin generation by these
cells. Our data indicate that MVs generally have thrombotic activity, whereas
thrombotic activity is not commonly observed for exosomes. Furthermore, exosomes
and MVs generally do not display fibrinolytic activity under physiological
conditions.