Abstract
Anti-fibrinolytic agents such as aprotinin and ε-aminocaproic acid (EACA) are used clinically to decrease peri-operative bleeding. Use of these treatments during cancer-related surgeries has led to investigation of the effect of fibrinolysis inhibition on cancer cell spread. The ability of aprotinin to reduce proteolytic activity of proteases required for metastasis suggests that it could have an anti-metastatic effect in patients undergoing tumor resection. However, many metastatic cells in the vasculature of a secondary tissue are associated with a micro-thrombus. The association of tumor cells with thrombi has been shown to increase their survival; therefore inhibition of plasmin-mediated fibrinolysis might instead increase metastatic cell survival by enhancing the association between thrombi and tumor cells. The goal of this work was to determine the effect of anti-fibrinolytic treatment on experimental metastasis and to establish the role of coagulation factors in this effect. The metastatic ability of B16F10 melanoma cells was evaluated in vivo following cell or animal pre-treatment with aprotinin or EACA. Additionally, a novel in vivo technique was developed, to permit analysis of tumor cell association with thrombi in the lung microvasculature using confocal microscopy. Aprotinin and EACA treatment of mice resulted in a significant increase in lung metastasis. Aprotinin treatment increased the size of thrombi in association with cells arrested in lung capillaries. This study suggests that clinical use of anti-fibrinolytic agents for cancer-related surgeries could result in increased metastatic ability of those cells shed immediately prior to and during surgery, and that this approach thus requires further study.
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Abbreviations
- EACA:
-
ε-Aminocaproic acid
- TXA:
-
Tranexamic acid
- MMP:
-
Matrix metalloproteinase
- ECM:
-
Extracellular matrix
- CMFDA:
-
5-Chloromethylfluorescein diacetate
- H&E:
-
Hematoxylin and eosin
- TF:
-
Tissue factor
- CP:
-
Cancer procoagulant
- LLC:
-
Lewis lung carcinoma
- NK:
-
Natural killer immune cells
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Acknowledgements
This study was supported in part by grant #042511 from the Canadian Institutes of Health Research (to AFC, ICM, and ABT) and by Bayer Pharmaceuticals. JMK is supported by a National Sciences and Engineering Council of Canada Post-Graduate Research Award. AFC is Canada Research Chair in Oncology and receives salary support from the Canada Research Chairs Program. The authors thank Kyle MacLean for his assistance with confocal microscopy.
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Kirstein, J.M., Graham, K.C., MacKenzie, L.T. et al. Effect of anti-fibrinolytic therapy on experimental melanoma metastasis. Clin Exp Metastasis 26, 121–131 (2009). https://doi.org/10.1007/s10585-008-9221-z
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DOI: https://doi.org/10.1007/s10585-008-9221-z