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Updated: Jun 26, 2026

An In Vitro Hemodynamic Loop Model to Investigate the Hemocytocompatibility and Host Cell Activation of Vascular Medical Devices
Published on: August 21, 2020
Aptamers influence the hemostatic system by activating the intrinsic coagulation pathway in an in vitro Chandler-Loop
Angela Paul1, Meltem Avci-Adali, Bernd Neumann
1Department of Thoracic, Cardiac, and Vascular Surgery, University Hospital Tuebingen, Calwerstrasse 7/1, Tuebingen, Germany.
Abstract:
One class of oligonucleotides with a high potential for use in medical applications is short nucleic acids, widely known as aptamers. Although several aptamers are already being used clinically, there are very few studies dealing with the impact aptamers have on the hemostatic system. In this study, we have performed a comprehensive evaluation of the hemostatic system including coagulation, platelets, complement, and inflammatory activation by using different aptamer concentrations and fresh human whole blood in a well-established flow model. We found that single-stranded aptamers did not have a negative influence on platelets, complement, or inflammation but were able to activate factor XII, kallikrein, and prothrombin in a concentration-dependent manner. Consequently, the influence of aptamers on the coagulation system should be taken into consideration before the use of any aptamer-based drugs in patients.
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