Thirty-two poly(ε)caprolactone (PCL) scaffolds have been produced by electrospinning directly into an auricle-shaped mould and seeded with articular chondrocytes harvested from bovine ankle joints. After seeding, the auricle shaped constructs were cultured in vitro and analysed at days 1, 7, 14 and 21 for regional differences in total DNA, glycosaminoglycan (GAG) and collagen (COL) content as well as the expression of aggrecan (AGG), collagen type I and type II (COL1/2) and matrix metalloproteinase 3 and 13 (MMP3/13). Stress-relaxation indentation testing was performed to investigate regional mechanical properties of the electrospun constructs. Electrospinning into a conductive mould yielded stable 3D constructs both initially and for the whole in vitro culture period, with an equilibrium modulus in the MPa range. Rapid cell proliferation and COL accumulation was observed until week 3. Quantitative real time PCR analysis showed an initial increase in AGG, no change in COL2, a persistent increase in COL1, and only a slight decrease initially for MMP3. Electrospinning of fibrous scaffolds directly into an auricle-shape represents a promising option for auricular tissue engineering, as it can reduce the steps needed to achieve an implantable structure.

译文

:已经通过直接电纺入耳廓形模具并植入从牛踝关节收获的关节软骨细胞来生产32个聚(ε)己内酯(PCL)支架。播种后,将耳廓形构建体进行体外培养,并在第1、7、14和21天分析总DNA,糖胺聚糖(GAG)和胶原蛋白(COL)含量以及聚集蛋白聚糖(AGG)的表达的区域差异, I型和II型胶原(COL1 / 2)以及基质金属蛋白酶3和13(MMP3 / 13)。进行应力松弛压痕测试以研究电纺结构的区域机械性能。静电纺成导电模具可在最初和整个体外培养期间产生稳定的3D结构,其平衡模量在MPa范围内。观察到快速的细胞增殖和COL积累,直到第3周。定量实时PCR分析显示,AGG最初增加,COL2没有变化,COL1持续增加,而MMP3最初仅略有下降。将纤维支架直接电纺成耳廓形状代表了耳廓组织工程的一个有前途的选择,因为它可以减少实现可植入结构所需的步骤。

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