フィブリン塊における同種間葉系幹細胞の注入によってウサギの膝関節における骨軟骨欠損の治療
Summary
ウサギの膝関節における骨軟骨欠損の治療のための実験技術が記載されている。骨軟骨欠損に同種間葉系幹細胞の移植は、組織工学の分野で有望な開発を提供しています。フィブリン細胞塊の準備<em> in vitroで</em>移植のための標準化された方法を提供しています。
Abstract
The treatment of osteochondral articular defects has been challenging physicians for many years. The better understanding of interactions of articular cartilage and subchondral bone in recent years led to increased attention to restoration of the entire osteochondral unit. In comparison to chondral lesions the regeneration of osteochondral defects is much more complex and a far greater surgical and therapeutic challenge. The damaged tissue does not only include the superficial cartilage layer but also the subchondral bone. For deep, osteochondral damage, as it occurs for example with osteochondrosis dissecans, the full thickness of the defect needs to be replaced to restore the joint surface 1. Eligible therapeutic procedures have to consider these two different tissues with their different intrinsic healing potential 2. In the last decades, several surgical treatment options have emerged and have already been clinically established 3-6.
Autologous or allogeneic osteochondral transplants consist of articular cartilage and subchondral bone and allow the replacement of the entire osteochondral unit. The defects are filled with cylindrical osteochondral grafts that aim to provide a congruent hyaline cartilage covered surface 3,7,8. Disadvantages are the limited amount of available grafts, donor site morbidity (for autologous transplants) and the incongruence of the surface; thereby the application of this method is especially limited for large defects.
New approaches in the field of tissue engineering opened up promising possibilities for regenerative osteochondral therapy. The implantation of autologous chondrocytes marked the first cell based biological approach for the treatment of full-thickness cartilage lesions and is now worldwide established with good clinical results even 10 to 20 years after implantation 9,10. However, to date, this technique is not suitable for the treatment of all types of lesions such as deep defects involving the subchondral bone 11.
The sandwich-technique combines bone grafting with current approaches in Tissue Engineering 5,6. This combination seems to be able to overcome the limitations seen in osteochondral grafts alone. After autologous bone grafting to the subchondral defect area, a membrane seeded with autologous chondrocytes is sutured above and facilitates to match the topology of the graft with the injured site. Of course, the previous bone reconstruction needs additional surgical time and often even an additional surgery. Moreover, to date, long-term data is missing 12.
Tissue Engineering without additional bone grafting aims to restore the complex structure and properties of native articular cartilage by chondrogenic and osteogenic potential of the transplanted cells. However, again, it is usually only the cartilage tissue that is more or less regenerated. Additional osteochondral damage needs a specific further treatment. In order to achieve a regeneration of the multilayered structure of osteochondral defects, three-dimensional tissue engineered products seeded with autologous/allogeneic cells might provide a good regeneration capacity 11.
Beside autologous chondrocytes, mesenchymal stem cells (MSC) seem to be an attractive alternative for the development of a full-thickness cartilage tissue. In numerous preclinical in vitro and in vivo studies, mesenchymal stem cells have displayed excellent tissue regeneration potential 13,14. The important advantage of mesenchymal stem cells especially for the treatment of osteochondral defects is that they have the capacity to differentiate in osteocytes as well as chondrocytes. Therefore, they potentially allow a multilayered regeneration of the defect.
In recent years, several scaffolds with osteochondral regenerative potential have therefore been developed and evaluated with promising preliminary results 1,15-18. Furthermore, fibrin glue as a cell carrier became one of the preferred techniques in experimental cartilage repair and has already successfully been used in several animal studies 19-21 and even first human trials 22.
The following protocol will demonstrate an experimental technique for isolating mesenchymal stem cells from a rabbit’s bone marrow, for subsequent proliferation in cell culture and for preparing a standardized in vitro-model for fibrin-cell-clots. Finally, a technique for the implantation of pre-established fibrin-cell-clots into artificial osteochondral defects of the rabbit’s knee joint will be described.
Protocol
Representative Results
Discussion
近年では、複雑な関節骨軟骨欠損治療の可能性 – そのような骨軟骨炎の離断、骨壊死や外傷に起因するものなどを – 組織工学的アプローチでは、ますます魅力的になりました。前述した病的なエンティティでは、組織の損傷は軟骨下骨に延びており、別の本質的な癒しの容量1によって特徴付けられる2組織が 含まれます。骨軟骨関節損傷11,23の病原性プロセスの軟骨下骨?…
Declarações
The authors have nothing to disclose.
Acknowledgements
このプロジェクトは、ドイツ研究協会（助成HE 4578/3-1）で、部分的にFP7 EU-プロジェクト "GAMBA" NMP3-SL-2010から245993によって賄われていた。
Materials
| Name of reagent/equipment | Company | Catalogue Number | Comments |
| DMEM | Biochrom AG | F 0415 | |
| FCS | PAN Biotech GmbH | 0401 | |
| Propofol | Fresenius Kabi | ||
| Penicillin/Streptomycin | Biochrom AG | A 2210 | 1,000 units/10 μg/μl in 0.9% NaCl |
| PBS Dulbecco (1X) | Biochrom AG | L1815 | |
| Ethanol (70%) | Merck KGaA | 410230 | |
| Trypan Blue Solution (0.4%) | Sigma-Aldrich | T8154 | |
| Biocoll Separation Sol. | Biochrom AG | L6115 | Isotonic solution Density: 1,077 g/ml |
| Trypsin-EDTA 0.05% | Invitrogen GmbH | 25300-054 | |
| Fentanyl | DeltaSelectGmBH | 1819340 | |
| NaCl solution (0.9%) | BBraun | 8333A193 | |
| Syringes (Injekt) | BBraun | 4606108V | |
| Needles (Sterican) | BBraun | 4657519 | |
| Forceps (blunt/sharp) | Aesculap | ||
| Scissors | Aesculap | ||
| Scalpels | Feather Safety Razor Co | 02.001.30.022 | |
| Pipettes research | Eppendorf | ||
| Bone Cutter | Aesculap | ||
| Tissue culture dishes 100 mm/150 mm | TPP AG | 93100/93150 | Growth area 60.1 mm2/147.8 mm2 |
| Tissue culture flasks 25/75 mm2 | TPP AG | 90025/90075 | 25 mm2, 75 mm2 |
| Centrifuge Tubes (50 ml) | TPP AG | 91050 | Gamma-sterilized |
| CO2 Incubator | Forma Scientific Inc. | ||
| Cell culture laminar flow hood Hera Safe | Heraeus Instruments | ||
| Sterile saw | Aesculap | ||
| Centrifuge Megafuge 2.0 R | Heraeus Instruments | ||
| Hemocytometer | Brand GmbH+Co KG | 717810 | Neubauer |
| Air operated power drill | Aesculap | ||
| TISSUCOL-Kit 1.0 ml Immuno | Baxter | 2546648 | |
| Fibers (4-0 Monocryl, 4-0 Vicryl) | Ethicon | ||
| Spray dressing (OpSite) | Smith&Nephew | 66004978 | Permeable for water vapor |
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