Seyed Mohamed Ali, Vijayaraghavan Kavitha
Department of Clinical Biochemistry, Faculty of Medicine, University of Tabuk, Tabuk 71491, Saudi Arabia.
Department of Chemical Engineering, Agni College of Technology, Old Mahabalipuram Road, Thalambur, Chennai, Tamil Nadu 600130, India.
Open Access Maced J Med Sci. 2018 Sep 18;6(9):1561-1570. doi: 10.3889/oamjms.2018.322. eCollection 2018 Sep 25.
BACKGROUND: Corneal blindness resulting from various medical conditions affects millions worldwide. The rapid developing tissue engineering field offers design of a scaffold with mechanical properties and transparency similar to that of the natural cornea. AIM: The present study aimed at to prepare and investigate the properties of PVA/chitosan blended scaffold by further cross-linking with 1-Ethyl-3-(3-dimethyl aminopropyl)-carbodiimide (EDC) and 2 N-Hydroxysuccinimide (NHS) as potential in vitro carrier for human limbal stem cells delivery. MATERIAL AND METHODS: Acetic acid dissolved chitosan was added to PVA solution, uniformly mixed with a homogenizer until the mixture was in a colloidal state, followed by HSO and formaldehyde added and the sample was allowed to cool, subsequently it was poured into a tube and heated in an oven at 60°C for 50 minutes. Finally, samples were soaked in a cross-linking bath with EDC, NHS and NaOH in HO/EtOH for 24 h consecutively stirred to cross-link the polymeric chains, reduce degradation. After soaking in the bath, the samples were carefully washed with 2% glycine aqueous solution several times to remove the remaining amount of cross-linkers, followed by washed with water to remove residual agents. Later the cross-linked scaffold subjected for various characterization and biological experiments. RESULTS: After viscosity measurement, the scaffold was observed by Fourier transform infrared (FT-IR). The water absorbency of PVA/Chitosan was increased 361% by swelling. Compression testing demonstrated that by increasing the amount of chitosan, the strength of the scaffold could be increased to 16×10-1 MPa. Our degradation results revealed by mass loss using equation shows that scaffold degraded gradually imply slow degradation. In vitro tests showed good cell proliferation and growth in the scaffold. Our assay results confirmed that the membrane could increase the cells adhesion and growth on the substrate. CONCLUSION: Hence, we strongly believe the use of this improved PVA/chitosan scaffold has potential to cut down the disadvantages of the human amniotic membrane (HAM) for corneal epithelium in ocular surface surgery and greater mechanical strength in future after successful experimentation with clinical trials.
背景:由各种医学病症导致的角膜盲影响着全球数百万人。快速发展的组织工程领域提供了一种具有与天然角膜相似的机械性能和透明度的支架设计。 目的:本研究旨在通过用1-乙基-3-(3-二甲基氨基丙基)-碳二亚胺(EDC)和N-羟基琥珀酰亚胺(NHS)进一步交联来制备和研究聚乙烯醇/壳聚糖共混支架的性能,作为人角膜缘干细胞递送的潜在体外载体。 材料与方法:将醋酸溶解的壳聚糖加入到聚乙烯醇溶液中,用匀浆器均匀混合直至混合物呈胶体状态,随后加入硫酸和甲醛并让样品冷却,接着将其倒入管中并在60°C的烘箱中加热50分钟。最后,将样品连续24小时浸泡在含有EDC、NHS和氢氧化钠的水/乙醇交联浴中并搅拌以使聚合物链交联,减少降解。浸泡在浴中后,将样品用2%甘氨酸水溶液小心洗涤多次以除去剩余的交联剂,接着用水洗涤以除去残留试剂。随后对交联支架进行各种表征和生物学实验。 结果:在测量粘度后,通过傅里叶变换红外光谱(FT-IR)观察支架。聚乙烯醇/壳聚糖的吸水性通过溶胀增加了361%。压缩测试表明,通过增加壳聚糖的量,支架的强度可提高至16×10⁻¹兆帕。我们使用公式通过质量损失得出的降解结果表明支架逐渐降解,意味着降解缓慢。体外测试表明在支架中有良好的细胞增殖和生长。我们的检测结果证实该膜可增加细胞在底物上的粘附和生长。 结论:因此,我们坚信这种改进的聚乙烯醇/壳聚糖支架在眼表手术中使用有潜力克服人羊膜(HAM)用于角膜上皮的缺点,并且在未来临床试验成功实验后具有更大的机械强度。
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