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Mesenchymal stem cells and collagen patches for anterior cruciate ligament repair

世界干细胞杂志：英文版（电子版） 2015年第2期7卷 521-534页

作者： Benjamin Gantenbein neha gadhari Samantha CW Chan Sandro Kohl Sufian S Ahmad Tissue and Organ Mechanobiology Institute for Surgical Technology and BiomechanicsUniversity of Bern EMPA Swiss Federal Laboratories for Materials Science and Technology Orthopedic Department Insel University Hospital

AIM: To investigate collagen patches seeded with mesenchymal stem cells(MSCs) and/or tenocytes(TCs) with regards to their suitability for anterior cruciate ligament(ACL) repair. METHODS: Dynamic intraligamentary stabilization utilizes a dynamic screw system to keep ACL remnants in place and promote biological healing, supplemented by collagen patches. How these scaffolds interact with cells and what type of benefit they provide has not yet been investigated in detail. Primary ACL-derived TCs and human bone marrow derived MSCs were seeded onto two different types of 3D collagen scaffolds, Chondro-Gide?(CG) and Novocart?(NC). Cells were seeded onto the scaffolds and cultured for 7 d either as a pure populations or as "premix" containing a 1:1 ratio of TCs to MSCs. Additionally, as controls, cells were seeded in monolayers and in co-cultures on both sides of porous high-density membrane inserts(0.4 μm). We analyzed the patches by real time polymerase chain reaction, glycosaminoglycan(GAG), DNA and hydroxyproline(HYP) content. To determine cell spreading and adherence in the scaffolds microscopic imaging techniques, i.e., confocal laser scanning microscopy(c LSM) and scanning electron microscopy(SEM), were ***: CLSM and SEM imaging analysis confirmed cell adherence onto scaffolds. The metabolic cell activity revealed that patches promote adherence and proliferation of cells. The most dramatic increase in absolute metabolic cell activity was measured for CG samples seeded with tenocytes or a 1:1 cell premix. Analysis of DNA content and c LSM imaging also indicated MSCs were not proliferating as nicely as tenocytes on CG. The HYP to GAG ratio significantly changed for the premix group, resulting from a slightly lower GAG content, demonstrating that the cells are modifying the underlying matrix. Real-time quantitativepolymerase chain reaction data indicated that MSCs showed a trend of differentiation towards a more tenogenic-like phenotype after 7 ***:

关键词： Anterior cruciate ligament rupture Anteriorcruciate ligament tenocyte Dynamic intraligamentarystabilization system Resazurin red assay Mesenchymalstem cells Real-time polymerase chain reaction Histology Scanning electron microscopy microscopy Scanning electron microscopy

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