Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran.
Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Biomed Mater Res A. 2019 Oct;107(10):2340-2349. doi: 10.1002/jbm.a.36742. Epub 2019 Jun 17.
Tissue engineering is one of the most promising areas for treatment of various ophthalmic diseases particularly for patients who suffer from limbal stem cell deficiency and this is due to the lack of existence of appropriate matrix for stem cell regeneration. The aim of this research project is to design and fabricate triple layered electrospun nanofibers as a suitable corneal tissue engineering scaffold and the objective is to investigate and perform various in vitro tests to find the most optimum and suitable scaffold for this purpose. Electrospun scaffolds were prepared in three layers. Poly(d, l-lactide-co-glycolide; PLGA, 50:50) nanofibers were electrospun as outer and inner layers of the scaffold and aligned type I collagen nanofibers were electrospun in the middle layer. Furthermore, the scaffolds were cross-linked by 1-ethyl-3-(3 dimethylaminopropyl) carbodiimide hydrochloride and glutaraldehyde. Structural, physical, and mechanical properties of scaffolds were investigated by using N adsorption/desorption isotherms, Fourier transform infrared spectroscopy, contact angle measurement, tensile test, degradation, shrinkage analysis, and scanning electron microscopy (SEM). In addition, capability to support cell attachment and viability were characterized by SEM, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay, and 4',6-diamidino-2-phenylindole staining. According to the result of Brunauer-Emmett-Teller analysis, specific surface area of electrospun scaffold was about 23.7 m g . Tensile tests on cross-linked scaffolds represented more suitable hydrophilicity and tensile behavior. In addition, degradation rate analysis indicated that noncross-linked scaffolds degraded faster than cross-linked one and cross-linking led to controlled shrinkage in the scaffold. The SEM analysis depicted nano-sized fibers in good shape. Also, the in vitro study represented an improved cell attachment and proliferation in the presence of human endometrial stem cells for both cross-linked and noncross-linked samples. The current study suggests the possibility of producing an appropriate substrate for successful cornea tissue engineering with a novel design.
组织工程是治疗各种眼科疾病的最有前途的领域之一,特别是对于患有角膜缘干细胞缺乏症的患者,这是由于缺乏适合干细胞再生的基质。本研究项目的目的是设计和制造三层电纺纳米纤维作为合适的角膜组织工程支架,目的是进行各种体外测试,以找到最适合该目的的支架。电纺支架制备成三层。聚(D,L-丙交酯-co-乙交酯; PLGA,50:50)纳米纤维作为支架的内外层电纺,I 型胶原纳米纤维定向排列在中间层。此外,支架通过 1-乙基-3-(3 二甲氨基丙基)碳化二亚胺盐酸盐和戊二醛交联。通过 N 吸附/解吸等温线、傅里叶变换红外光谱、接触角测量、拉伸试验、降解、收缩分析和扫描电子显微镜(SEM)研究支架的结构、物理和机械性能。此外,通过 SEM、3-(4,5-二甲基噻唑-2-基)-2,5-二苯基四氮唑溴盐测定法和 4',6-二脒基-2-苯吲哚染色法表征支架支持细胞附着和活力的能力。根据 Brunauer-Emmett-Teller 分析的结果,电纺支架的比表面积约为 23.7 m g 。交联支架的拉伸试验表现出更适合的亲水性和拉伸行为。此外,降解率分析表明,非交联支架的降解速度快于交联支架,交联导致支架的收缩得到控制。SEM 分析描述了形状良好的纳米纤维。此外,体外研究表明,在人子宫内膜干细胞存在的情况下,交联和非交联样品的细胞附着和增殖均得到改善。本研究表明,使用新型设计有可能生产出适合成功角膜组织工程的合适基质。
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