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Vascularization of engineered cartilage constructs in a mouse model

机译:小鼠模型中工程化软骨构建物的血管化

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Tissue engineering of cartilage tissue offers a promising method for reconstructing ear, nose, larynx and trachea defects. However, a lack of sufficient nutrient supply to cartilage constructs limits this procedure. Only a few animal models exist to vascularize the seeded scaffolds. In this study, polycaprolactone (PCL)-based polyurethane scaffolds are seeded with 1 x 10(6) human cartilage cells and implanted in the right hind leg of a nude mouse using an arteriovenous flow-through vessel loop for angiogenesis for the first 3 weeks. Equally seeded scaffolds but without access to a vessel loop served as controls. After 3 weeks, a transposition of the vascularized scaffolds into the groin of the nude mouse was performed. Constructs (verum and controls) were explanted 1 and 6 weeks after transposition. Constructs with implanted vessels were well vascularized. The amount of cells increased in vascularized constructs compared to the controls but at the same time noticeably less extracellular matrix was produced. This mouse model provides critical answers to important questions concerning the vascularization of engineered tissue, which offers a viable option for repairing defects, especially when the desired amount of autologous cartilage or other tissues is not available and the nutritive situation at the implantation site is poor.
机译:软骨组织的组织工程学为重建耳,鼻,喉和气管缺陷提供了一种有前途的方法。然而,软骨构造缺乏足够的营养供应限制了该程序。只有少数动物模型可以使植入的支架血管化。在这项研究中,将基于聚己内酯(PCL)的聚氨酯支架植入1 x 10(6)个人类软骨细胞,并使用动静脉穿流血管环将其植入裸鼠的右后腿,以进行头3周的血管生成。种子均等的支架,但不接触血管环作为对照。 3周后,将血管化支架转位至裸鼠的腹股沟。转座后1和6周移出构建体(普通和对照)。具有植入血管的构建体良好地血管化。与对照相比,血管化构建物中的细胞数量增加,但同时产生的胞外基质明显减少。该小鼠模型为有关工程化组织血管形成的重要问题提供了关键答案,这为修复缺陷提供了可行的选择,尤其是在无法获得所需数量的自体软骨或其他组织且植入部位的营养状况不佳时。

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