Zusammenfassung
Hintergrund: Vor wenigen Jahren gelang die Isolierung mesenchymaler Stammzellen aus dem Nabelschnurblut. Es stellt sich die Frage, wieweit sich diese Zellpopulation durch ihre osteoblastäre Differenzierungspotenz für ein Tissue Engineering mit potenzieller klinischer Anwendung eignet. Methoden: Aus humanem Nabelschnurblut Neugeborener isolierte unrestringierte, somatische Stammzellen (USSC) wurden osteo-, chondro- und adipoblastär stimuliert. Anschließend erfolgte die Inkubation von USSC auf einem Kollagen-I/III-Trägermaterial, um dessen osteoblastäre Induktivitätspotenz immunzytochemisch zu untersuchen. Zur Evaluierung immunologischer Effekte nach Xenotransplantation wurde als Kleintiermodell die athyme Nacktratte ausgewählt. Durch Transplantation in eine knöcherne Defektzone wurde das Überleben, „Homing“ sowie die Osteogenese von humanen USSC untersucht. Ergebnisse: Die mesenchymale Multipotenz von USSC konnte in vitro nachgewiesen werden. Der verwendete Kollagen-I/III-Träger förderte die osteoblastäre In-vitro-Differenzierung. Humane USSC überlebten in verschiedenen Organen der Nacktratte und zeigten eine osteoblastäre Differenzierung. Schlussfolgerung: Multipotente mesenchymale Stammzellen aus dem Nabelschnurblut (USSC) differenzieren sowohl in vitro auf einem Kollagen-I/III-Träger als auch in vivo in der athymen Nacktratte osteoblastär.
Abstract
Background: Mesenchymal stem cells with an osteoblastic differentiating potency are investigated in regard of probable tissue engineering for further clinical application. The following report describes the use of cord blood derived stem cells as an alternative to other stem cell populations for bone regenerating tissue engineering. Methods: To demonstrate the multipotency of cord blood derived mesenchymal stem cells, unrestringated somatic stem cells (USSC) were isolated from cord blood and underwent an osteo-, chondro- and adipoblastic in vitro stimulation. To evaluate the osteoinductive potency of a porcine collagen I/III cell carrier USSC were incubated on this matrix. To investigate the in vivo effects of human USSC an athymic rat model was developed. These cells were transplanted into a femoral defect. Results: Cord blood derived mesenchymal stem cells (USSC) have an in vitro multipotency and show adipo-, chondro- and osteogenic differentiation. The porcine collagen I/III carrier promoted an osteoblastic differentiation. USSC survived after xenotransplantation in an athymic rat and differentiated into osteoblasts filling the bony defect zone. Conclusion: Human USSC are a mesenchymal multipotent stem cell population that shows osteoblastic differentiation onto a collagen I/III carrier in vitro as well as in an athymic rat in vivo.
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Danksagung
Die Autoren der vorliegenden Arbeit bedanken sich bei den folgenden Personen für ihre Unterstützung des orthopädischen Stammzellprojektes: Frau Dr. vet. med. A. Treiber und Frau I. Schrey, Tierversuchanlage, Fr. S. Lensing-Höhn, Forschungslabor der orthopädischen Klinik der Heinrich-Heine-Universität Düsseldorf.
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Jäger, M., Sager, M., Knipper, A. et al. In-vitro- und In-vivo-Knochenregenerierung durch mesenchymale Stammzellen aus dem Nabelschnurblut. Orthopäde 33, 1361–1372 (2004). https://doi.org/10.1007/s00132-004-0737-x
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DOI: https://doi.org/10.1007/s00132-004-0737-x