Abstract
Reproducibility of clinical output is important when investigating therapeutic efficacy in pre-clinical animal studies. Due to its physiological relevance, a swine myocardial infarction (MI) model has been widely used to evaluate the effectiveness of stem cells or tissue-engineered constructs for ischemic heart diseases. Several methods are used to induce MI in the swine model. However, it is difficult, using these approaches, to obtain a similar level of functional outcomes from a group of animals due to interpersonal variation, leading to increased experimental cost. Hence, in order to minimize human intervention, we developed an approach to use a customized occluder that has dimensional similarities with that of the coronary artery of animals in the case of the swine model. We carried out angiography to measure the diameter of the middle left anterior descending artery of each individual animal to fabricate the customized occluder using a 3D-printing system. The fabricated occluder contained a central hole smaller than that of the targeted middle left anterior descending artery to mimic an atherosclerotic coronary artery that has an approximately 20% blocked condition. Interestingly, the 3D-printed occluder can provide continuous blood flow through the central pore, indicating a high survival rate (88%) of up to 28 days post-operation. This method showed the possibility of creating consistent myocardial infarction induction as compared to the conventional representative closed-chest method (50% survival rate), thus highlighting how our method can have a profound effect on accelerating reliable experiments for developing new therapeutic approaches to ischemic heart diseases.
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Acknowledgements
This research was supported by the Bio & Medical Technology Development Program and Basic Science Research Program through the National Research Foundation (NRF), funded by the Korean government (MSIT) (No. 2018M3A9E2024584) and the Ministry of Trade, Industry and Energy (MOTIE) and Korea Institute for Advancement of Technology (KIAT) through the International Cooperative R&D program (No. P0011282).
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HBK, HP, DSS, MK, YA, MHJ, and YJH conducted all animal experiments and analyzed experimental results. SJ and JJ developed and fabricated a 3D-printed occluder and analyzed experimental results. HBK and SJ were involved in writing-original draft and visualization. SD was involved in writing-review and editing. JJ and YJH were involved in conceptualization, writing-original draft, review and editing, and contributed to supervision and funding acquisition.
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All institutional and national guidelines for the care and use of laboratory animals were followed.
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Kim, H.B., Jung, S., Park, H. et al. Customized 3D-printed occluders enabling the reproduction of consistent and stable heart failure in swine models. Bio-des. Manuf. 4, 833–841 (2021). https://doi.org/10.1007/s42242-021-00145-4
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DOI: https://doi.org/10.1007/s42242-021-00145-4