一种用于软骨组织工程的新型可生物降解聚酯弹性体。
A new biodegradable polyester elastomer for cartilage tissue engineering.
作者信息
Kang Yong, Yang Jian, Khan Sadiya, Anissian Lucas, Ameer Guillermo A
机构信息
Biomedical Engineering Department, Northwestern University, Evanston, Illinois 60208, USA.
出版信息
J Biomed Mater Res A. 2006 May;77(2):331-9. doi: 10.1002/jbm.a.30607.
The objective of this study is to assess whether a new biodegradable elastomer, poly(1,8-octanediol citrate) (POC), would be a suitable material to engineer elastomeric scaffolds for cartilage tissue engineering. Porous POC scaffolds were prepared via the salt-leaching method and initially assessed for their ability to rapidly recover from compressive deformation (% recovery ratio). Controls consisted of scaffolds made from other materials commonly used in cartilage tissue engineering, including 2% agarose, 4% alginate, non woven poly(glycolic acid) (PGA) meshes, and non woven poly(L-lactide-co-glycolide) (PLGA) meshes. Articular chondrocytes from bovine knee were isolated and seeded onto porous disk-shaped POC scaffolds, which were subsequently cultured in vitro for up to 28 days. POC scaffolds completely recover from compressive deformation, and the stress-strain curve is typical of an elastomer (recovery ratio>98%). Agarose gel (2%) scaffolds broke during the compression test. The recovery ratio of 4% alginate gel scaffolds, PLLA, and PGA were 72, 85, and 88%, respectively. The Young's modulus of POC-chondrocyte constructs and cell-free POC scaffolds cultured for 28 days were 12.02+/-2.26 kPa and 3.27+/-0.72 kPa, respectively. After 28 days of culture, the recovery ratio of POC-chondrocyte constructs and cell-free POC scaffolds were 93% and 99%, respectively. The glycosaminoglycan (GAG) and collagen content at day 28 was 36% and 26% of that found in bovine knee cartilage explants. Histology/immunohistochemistry evaluations confirm that chondrocytes were able to attach to the pore walls within the scaffold, maintain cell phenotype, and form a cartilaginous tissue during the 28 days of culture.
本研究的目的是评估一种新型可生物降解弹性体聚(1,8 - 辛二醇柠檬酸酯)(POC)是否是用于软骨组织工程的弹性体支架构建的合适材料。通过盐析法制备了多孔POC支架,并初步评估了其从压缩变形中快速恢复的能力(恢复率)。对照组由软骨组织工程中常用的其他材料制成的支架组成,包括2%琼脂糖、4%海藻酸盐、非织造聚乙醇酸(PGA)网片和非织造聚(L - 丙交酯 - 乙交酯)(PLGA)网片。从牛膝关节分离出关节软骨细胞并接种到多孔盘状POC支架上,随后在体外培养长达28天。POC支架能从压缩变形中完全恢复,应力 - 应变曲线是典型的弹性体曲线(恢复率>98%)。琼脂糖凝胶(2%)支架在压缩试验中破裂。4%海藻酸盐凝胶支架、聚L - 乳酸(PLLA)和PGA的恢复率分别为72%、85%和88%。培养28天的POC - 软骨细胞构建体和无细胞POC支架的杨氏模量分别为12.02±2.26 kPa和3.27±0.72 kPa。培养28天后,POC - 软骨细胞构建体和无细胞POC支架的恢复率分别为93%和99%。培养28天时糖胺聚糖(GAG)和胶原蛋白含量分别为牛膝关节软骨外植体中含量的36%和26%。组织学/免疫组织化学评估证实,软骨细胞能够附着在支架内的孔壁上,维持细胞表型,并在28天的培养过程中形成软骨组织。