Abstract
The mechanical stimulation applied on engineered vascular constructs in perfusion bioreactors has been shown to be beneficial for their maturation. The level of mechanical stimulation applied on these constructs depends on the flow parameters of the circuit (e.g., fluid viscosity, flow rate, frequency, and pressure). As a group, these parameters are often overlooked in the literature, and they rarely meet the physiological values of the blood flow. For this reason, the level of circumferential stretching and shear stress that blood vessels experience in the human body are rarely reproduced. In this work, we reported the development of a physiologically relevant platform for (1) the in situ fabrication of vascular wall models based on collagen gel, and (2) their maturation under physiological levels of mechanical stimulation in a perfusion bioreactor (pulsatile flow rate of 100 mL/min, frequency of 1 Hz, pressure of 80–120 mmHg, and viscosity of 4 cP). One week of dynamic maturation oriented the seeded cells into the circumferential direction, increased the deposition of collagen and key elastin fiber-related proteins, and improved the mechanical properties in terms of tensile equilibrium elastic modulus (by 110%) and strength at break (by 63%) when compared to the static condition. In addition to the maturation study under selected physiologically relevant mechanical stimulation (such as adult, fetal, child, and hypertension conditions), the platform might also be used as a relevant in vitro testing system for new drugs or pro-active coating to medical devices (such as stents, endografts, and vascular prostheses) expected to trigger specific mechanisms or activities in vascular cells composing the arterial wall.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors would like to thank Francesco Copes, PhD, for his precious help and guidance all along this research. This work was partially supported by the Natural Sciences and Engineering Research Council of Canada (NSERC to DM and DPR), the NSERC Create Program in Regenerative Medicine, the Canadian Foundation for the Innovation, and the Fonds de Recherche du Québec (Nature et Technologies, and Santé to DM and DPR).
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Camasão, D.B., Li, L., Drouin, B. et al. Physiologically relevant platform for an advanced in vitro model of the vascular wall: focus on in situ fabrication and mechanical maturation. In vitro models 1, 179–195 (2022). https://doi.org/10.1007/s44164-022-00012-1
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DOI: https://doi.org/10.1007/s44164-022-00012-1