Abstract
Although artificial prostheses for diseased heart valves have been around for several decades, viable heart valve replacements have yet to be developed due to their complicated nature. The majority of research in heart valve replacement technology seeks to improve decellularization techniques for porcine valves or bovine pericardium as an effort to improve current clinically used valves. The drawback of clinically used valves is that they are nonviable and thus do not grow or remodel once implanted inside patients. This is particularly detrimental for pediatric patients, who will likely need several reoperations over the course of their lifetimes to implant larger valves as the patient grows. Due to this limitation, additional biomaterials, both synthetic and natural in origin, are also being investigated as novel scaffolds for tissue-engineered heart valves, specifically for the pediatric population. Here, we provide a brief overview of valves in clinical use as well as of the materials being investigated as novel tissue-engineered heart valve scaffolds. Additionally, we focus on natural-based biomaterials for promoting cell behavior that is indicative of the developmental biology process that occurs in the formation of heart valves in utero, such as epithelial-to-mesenchymal transition or transformation. By engineering materials that promote native developmental biology cues and signaling, while also providing mechanical integrity once implanted, a viable tissue-engineered heart valve may one day be realized. A viable tissue-engineered heart valve, capable of growing and remodeling actively inside a patient, could reduce risks and complications associated with current valve replacement options and improve overall quality of life in the thousands of patients who received such valves each year, particularly for children.
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Abbreviations
- BMP2:
-
Bone morphogenic protein 2
- ES:
-
Electrospun
- EPC:
-
Endothelial/epithelial progenitor cell
- EMT:
-
Epithelial-to-mesenchymal transition or transformation
- ePTFE:
-
Expanded poly(tetraflouroethylene)
- ECM:
-
Extracellular matrix
- FDM:
-
Fused deposition modeling
- GAG:
-
Glycosaminoglycan
- HA:
-
Hyaluronic acid
- MMP:
-
Matrix metalloproteinase
- MSC:
-
Mesenchymal stem cell
- MEKK3:
-
Mitogen-activated protein 3 kinase
- PEUU:
-
Poly(ester urea urethane)
- PEG:
-
Poly(ethylene glycol)
- PGS:
-
Poly(glycerol sebacate)
- PGA:
-
Poly(glycolic acid)
- PLA:
-
Poly(lactic acid)
- P4HB:
-
Poly-4-hyrdoxybutyrate
- PCL:
-
Polycaprolactone
- PCU:
-
Polycarbonate
- PDO:
-
Polydioxaneone
- POSS:
-
Polyhedral oligomeric silsesquioxanes
- TPU:
-
Thermoplastic polyurethane
- TGF-β1:
-
Transforming growth factor β1
- TGF-β2:
-
Transforming growth factor β2
- VEC:
-
Valvular endothelial cell
- VIC:
-
Valvular interstitial cell
- VEGF:
-
Vascular endothelial growth factor
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Acknowledgments
YWC was supported by NIH Common Fund grants (EB008539 and HL092551). AK was supported by NIH (DE019024, HL092836, and HL099073). WDM was supported by the American Heart Association (0835496N and 09GRNT2010125), Wallace H. Coulter Foundation (Early Career Award), NSF (1055384), and NIH (HL094707).
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Sewell-Loftin, M.K., Chun, Y.W., Khademhosseini, A. et al. EMT-Inducing Biomaterials for Heart Valve Engineering: Taking Cues from Developmental Biology. J. of Cardiovasc. Trans. Res. 4, 658–671 (2011). https://doi.org/10.1007/s12265-011-9300-4
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DOI: https://doi.org/10.1007/s12265-011-9300-4