Abstract
Tissue-engineered heart valves with self-repair and regeneration properties may overcome the problem of long-term degeneration of currently used artificial prostheses. The aim of this study was the development and in vivo proof-of-concept of next-generation off-the-shelf tissue-engineered sinus valve (TESV) for transcatheter pulmonary valve replacement (TPVR). Transcatheter implantation of off-the-shelf TESVs was performed in a translational sheep model for up to 16 weeks. Transapical delivery of TESVs was successful and showed good acute and short-term performance (up to 8 weeks), which then worsened over time most likely due to a non-optimized in vitro valve design. Post-mortem analyses confirmed the remodelling potential of the TESVs, with host cell infiltration, polymer degradation, and collagen and elastin deposition. TESVs proved to be suitable as TPVR in a preclinical model, with encouraging short-term performance and remodelling potential. Future studies will enhance the clinical translation of such approach by improving the valve design to ensure long-term functionality.
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Abbreviations
- TPVR:
-
Transcatheter Pulmonary Valve Replacement
- TE:
-
Tissue Engineering
- TEHV(s):
-
Tissue-engineered heart valve(s)
- TESV(s):
-
Tissue-Engineered Sinus Valve(s)
- GLP:
-
Good laboratory practice
- ECM:
-
Extracellular matrix
- GAGs:
-
Glycosaminoglycans
- HYP:
-
Hydroxyproline
- H&E:
-
Hematoxilin and Eosin
- α-SMA:
-
Alpha-smooth muscle actin
- VG-EL:
-
Van Gieson-Elastin
- Vim:
-
Vimentin
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All the authors have no conflicts of interest to declare. Author Sarah E. Motta declares that she has no conflict of interest. Author Emanuela S. Fioretta declares that she has no conflict of interest. Author Petra E. Dijkman declares that she has no conflict of interest. Author Valentina Lintas declares that she has no conflict of interest. Author Luc Behr declares that he has no conflict of interest. Author Simon P. Hoerstrup declares that he has no conflict of interest. Author Maximilian Y. Emmert declares that he has no conflict of interest.
Ethical Approval for Research Involving Animals
All institutional and national guidelines for the care and use of laboratory animals were followed and approved by the appropriate institutional committees. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.
Ethical Approval for Research Involving Humans
This article does not contain any studies with human participants performed by any of the authors.
Clinical Relevance of the Study
Valve geometry is considered a key factor to achieve a favourable remodelling and long-term functionality in TEHVs thereby building the basis for a safe clinical translation. To date, none of the currently used transcatheter TEHV solutions feature the sinus of Valsalva in their stent geometry. In this study, we demonstrated the technical feasibility of combining a sinus-shape stent with in vitro grown ECM-based TEHVs fully compatible with transcatheter implantation procedures.
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Motta, S.E., Fioretta, E.S., Dijkman, P.E. et al. Development of an Off-the-Shelf Tissue-Engineered Sinus Valve for Transcatheter Pulmonary Valve Replacement: a Proof-of-Concept Study. J. of Cardiovasc. Trans. Res. 11, 182–191 (2018). https://doi.org/10.1007/s12265-018-9800-6
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DOI: https://doi.org/10.1007/s12265-018-9800-6