Zusammenfassung
Aktuell werden für die Züchtung von Herzklappengewebe („tissue engineering“) aus Patienten gewonnene Zellen oder Stammzellen verwendet, die in vitro vor der Implantation auf verschiedenen Matrizes angesiedelt werden. Nachteile bei diesen Verfahren sind die lange In-vitro-Kultivierungsdauer, das während dieser Zeit bestehende Infektionsrisiko und die aufwändige und kostenintensive Ausstattung. Mit einer Off-the-shelf-Herzklappe mit In-vivo-Endothelialisierungs- und Regenerationspotenzial könnten diese Limitierungen umgangen werden. Außerdem würde die Entwicklung einer Herzklappe mit Wachstumspotenzial eine enorme Verbesserung für pädiatrische Patienten bedeuten. Dieser Artikel diskutiert verschiedene Startermatrizes, Homing- und Immobilisierungsstrategien von Patientenzellen sowie Maskierungsmöglichkeiten für inflammatorische Strukturen für das In-vivo-Oberflächen- und -Tissue-Engineering (TE) von Herzklappen. Zusätzlich wird ein neues Konzept vorgestellt, das auf der Immobilisierung von hochspezifischen DNA-Aptameren auf der Herzklappenmatrix basiert, die als Fängermoleküle für im Blut zirkulierende endotheliale Progenitorzellen (EPC) fungieren.
Abstract
Currently pursued tissue engineering principles of heart valves require tissue or stem cell-derived autologous cells with subsequent in vitro incubation on matrix scaffolds. Limitations of this approach are a long in vitro culture, a constantly accompanied risk of infection, and the requirement of a sophisticated, cost intensive infrastructure. An “off-the-shelf” heart valve with in vivo endothelialization and tissue regeneration potential represents an attractive alternative to overcome these limitations. Particularly for the pediatric patients, the development of heart valves with growth potential would significantly improve current treatment options. This article discusses different starter matrices, homing and immobilization strategies of host cells, and masking approaches of inflammation for in vivo surface and tissue engineering of heart valves. A novel concept based on highly specific DNA aptamers immobilized on the heart valve surface as capture molecules for endothelial progenitor cells (EPCs) circulating in the blood stream is presented.
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Schleicher, M., Wendel, HP., Huber, A. et al. In-vivo-Züchtung von Herzklappengewebe. Z Herz- Thorax- Gefäßchir 24, 6–13 (2010). https://doi.org/10.1007/s00398-009-0753-6
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DOI: https://doi.org/10.1007/s00398-009-0753-6