共查询到19条相似文献,搜索用时 406 毫秒
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本文报导了用胶原作为软骨组织的载体材料在组织工程化软骨中的研究情况.本研究采用冷冻干燥方法制备出了Ⅰ-型胶原(sigma)、Ⅱ-型胶原(sigma)和混合型胶原(本室提取)的胶原海绵,并将其用作软骨组织工程的载体支架,比较研究了这三种胶原材料支架在软骨组织工程应用中的效果,筛选出了较理想的软骨组织工程载体材料. 相似文献
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组织工程三维多孔支架材料制备技术的研究现状 总被引:2,自引:0,他引:2
组织工程支架材料是组织工程成败之关键因素,制备一种既具有良好生物相容性和生物降解性,又具有,特定形状和三维连通多孔结构的支架材料是组织工程的一个重要方面.主要综述了组织工程多孔支架材料制备技术的研究现状,分析和总结了各制备技术的优缺点,并对其发展趋势进行了展望. 相似文献
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组织工程技术是有望从根本上解决组织或器官损伤及实现功能重建的前沿技术,其关键之一是制备具有良好生物相容性和生物降解性的支架材料。水凝胶由于具有众多良好的特性,成为组织工程研究中一种优良的支架材料。丝素蛋白水凝胶由于独特的性质、多样化的成胶方式以及优异的可加工性成为了支架材料研究的热点,备受学者的青睐并涌现出了大量的研究成果。本文在阐明丝素蛋白凝胶原理的基础上,回顾了目前较为成熟的凝胶化方法,随后重点综述了丝素蛋白水凝胶在组织工程中的研究进展,最后进行了总结和展望,以期为相关领域的研究者提供参考和借鉴。 相似文献
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Soumen Jana Sheeny K. Lan Levengood Miqin Zhang 《Advanced materials (Deerfield Beach, Fla.)》2016,28(48):10588-10612
Repair of damaged skeletal‐muscle tissue is limited by the regenerative capacity of the native tissue. Current clinical approaches are not optimal for the treatment of large volumetric skeletal‐muscle loss. As an alternative, tissue engineering represents a promising approach for the functional restoration of damaged muscle tissue. A typical tissue‐engineering process involves the design and fabrication of a scaffold that closely mimics the native skeletal‐muscle extracellular matrix (ECM), allowing organization of cells into a physiologically relevant 3D architecture. In particular, anisotropic materials that mimic the morphology of the native skeletal‐muscle ECM, can be fabricated using various biocompatible materials to guide cell alignment, elongation, proliferation, and differentiation into myotubes. Here, an overview of fundamental concepts associated with muscle‐tissue engineering and the current status of muscle‐tissue‐engineering approaches is provided. Recent advances in the development of anisotropic scaffolds with micro‐ or nanoscale features are reviewed, and how scaffold topographical, mechanical, and biochemical cues correlate to observed cellular function and phenotype development is examined. Finally, some recent developments in both the design and utility of anisotropic materials in skeletal‐muscle‐tissue engineering are highlighted, along with their potential impact on future research and clinical applications. 相似文献
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用超临界CO2法制备聚乳酸三维多孔支架材料 总被引:5,自引:0,他引:5
在超临界CO2(SC—CO2)条件下制备了生物相容性良好的聚乳酸(PLA)多孔材料,研究了PLA的分子量、SC—CO2的压力、温度和处理时间对多孔材料的结构形态、孔隙率和玻璃化温度的影响。结果表明:支架材料的孔洞分布、结构形态和孔隙率不仅与聚乳酸的分子量有关,而且与处理样品的压力、温度和时间关系密切;经超临界CO2处理后材料的玻璃化温度(Tg)有所升高,与传统的方法所制得的材料相比较,多孔材料不仅杂质少,孔径孔率分布均匀,孔洞表面粗糙,而且在大孔之间几乎布满了直径为10—20μm的微孔,该结构提供了营养物质和新陈代谢的通道,且细胞和生长因子也能通过。 相似文献
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Timnak A Gharebaghi FY Shariati RP Bahrami SH Javadian S Emami ShH Shokrgozar MA 《Journal of materials science. Materials in medicine》2011,22(6):1555-1567
Nerve tissue engineering is one of the most promising methods in nerve tissue regeneration. The development of blended collagen
and glycosaminoglycan scaffolds can potentially be used in many soft tissue engineering applications. In this study an attempt
was made to develop two types of random and aligned electrospun, nanofibrous scaffold using collagen and a common type of
glycosaminoglycan. Ion chromatography test, MTT and attachment assays were conducted respectively to trace the release of
glycosaminoglycan, and to investigate the biocompatibility of the scaffold. Cell cultural tests showed that the scaffold acted
as a positive factor to support connective tissue cell outgrowth. The positive effect of fiber orientation on cell outgrowth
organization was traced through SEM images. Porosity percentage calculation and tensile strength measurement of the webs specified
analogous properties to the native neural matrix tissue. These results suggested that nanostructured porous collagen-glycosaminoglycan
scaffold is a potential cell carrier in nerve tissue engineering. 相似文献
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Tissue engineering has been developed as a prospective approach for the repair of articular cartilage defects. Engineered osteochondral implants can facilitate the fixation and integration with host tissue, and therefore promote the regeneration of osteochondral defects. A biphasic scaffold with a stratified two-layer structure for osteochondral tissue engineering was developed from biodegradable synthetic and naturally derived polymers. The upper layer of the scaffold for cartilage engineering was collagen sponge; the lower layer for bone engineering was a composite sponge of poly(DL-lactic-co-glycolic acid) (PLGA) and naturally derived collagen. The PLGA–collagen composite sponge layer had a composite structure with collagen microsponge formed in the pores of a skeleton PLGA sponge. The collagen sponge in the two respective layers was connected. Observation of the collagen/PLGA–collagen biphasic scaffold by scanning electron microscopy (SEM) demonstrated the connected stratified structure. The biphasic scaffold was used for culture of canine bone-marrow-derived mesenchymal stem cells. The cell/scaffold construct was implanted in an osteochondral defect in the knee of a one-year old beagle. Osteochondral tissue was regenerated four months after implantation. Cartilage- and bone-like tissues were formed in the respective layers. The collagen/PLGA–collagen biphasic scaffold will be useful for osteochondral tissue engineering. 相似文献
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Creating heterogeneous tissue constructs with an even cell distribution and robust mechanical strength remain important challenges to the success of in vivo tissue engineering. To address these issues, we are developing a scaffold sheet tissue engineering strategy consisting of thin (~200 μm), strong, elastic, and porous crosslinked urethane-doped polyester (CUPE) scaffold sheets that are bonded together chemically or through cell culture. Suture retention of the tissue constructs (four sheets) fabricated by the scaffold sheet tissue engineering strategy is close to the surgical requirement (1.8 N) rendering their potential for immediate implantation without a need for long cell culture times. Cell culture results using 3T3 fibroblasts show that the scaffold sheets are bonded into a tissue construct via the extracellular matrix produced by the cells after 2 weeks of in vitro cell culture. 相似文献