组织工程

Migration of liver and kidney explants inside trapezoidal PDMS microchannels

ty10086 提交于 周四, 08/26/2021 - 13:44
Abstract(#br)We compared the migration of liver and kidney explants, harvested from chicken embryos, cultivated inside trapezoidal microchannels and onto flat samples made of polydimethylsiloxane (PDMS). In all cases, liver migration was faster and greater than kidney migration. The microchannels enhanced 3D migration when compared to the flat samples, which made only 2D migration possible. However, migration velocity was found to be higher in 2D than in 3D migration.

Arrays of 100μm x 100μm dielectric elastomer actuators to strain the single cells

ty10086 提交于 周四, 08/26/2021 - 13:42
Abstract(#br)Dielectric Elastomer Actuators (DEA) are compliant devices capable of generating large percentage strains with sub-second response times. Miniaturizing DEAs is challenging principally because of the need for μm-scale compliant electrodes.

Bio-functionalized silk hydrogel microfluidic systems

ty10086 提交于 周四, 08/26/2021 - 13:24
Abstract(#br)Bio-functionalized microfluidic systems were developed based on a silk protein hydrogel elastomeric materials. A facile multilayer fabrication method using gelatin sacrificial molding and layer-by-layer assembly was implemented to construct interconnected, three dimensional (3D) microchannel networks in silk hydrogels at 100 μm minimum feature resolution. Mechanically activated valves were implemented to demonstrate pneumatic control of microflow.

A novel comprehensive approach for human vascular allografts cryopreservation and radiation sterilization for the tissue engineering industry

ty10086 提交于 周四, 08/26/2021 - 13:06
Aim: to verify new techniques for human cadaveric vascular allografts cryopreservation, thawing and sterilization for the tissue engineering purposes. We use polydimethylsiloxane (PDMS) as a well-known, promising coolant. This allowed us to completely omit any cryoprotective or vitrifying solutions. Using of PDMS also makes possible an applying these allografts directly after freezing and decellularization and also it will also provide an opportunity to develop secure protocols of tissue— engineered vascular conduits cryopreservation. Matherial and methods.

EndOxy:内皮细胞在PDMS气体交换膜上的中期稳定性和抗剪切应力

ty10086 提交于 周三, 08/25/2021 - 17:18
内皮化氧合器装置( EndOxy )具有生理、非致血栓和抗炎性表面,有可能克服目前常规体外膜氧合的缺点,如血栓栓塞和出血等并发症,恶化足够的长期血液相容性。气体交换膜的内皮化,从而形成非致血栓和抗炎表面的方法是很有前景的。本研究考察了动态条件下RGD-聚二甲基硅氧烷( RGD- PDMS )气体交换膜上内皮细胞的中期抗剪切应力、气体传递速率和细胞密度。将人脐静脉内皮细胞接种于RGD- PDMS上,在微流控生物反应器中暴露于特定的剪切应力。采用亮场显微镜和免疫细胞化学方法评估内皮细胞形态。此外,对空白、RGD -共轭和内皮化PDMS增氧膜进行了气体转移测试。RGD- PDMS气体交换膜在2.9dyn / cm2的壁面剪切应力下最多能耐受21 天的内皮细胞动态培养;在2.9dyn / cm2和5.7dyn / cm2的动态预培养1小时后,细胞能耐受8.6dyn / cm2的壁面剪切应力;在2.9dyn / cm2的动态预培养3天和5.7dyn / cm2的动态预培养1小时后,细胞能耐受8.6dyn / cm2的壁面剪切应力,保持细胞完整性。气体传递( GT )试验表明,RGD- PDMS的RGD共轭和内皮化均不能显著降低短期内膜的气体传递速率。动态培养内皮细胞至少72  小时气体转移率稳定。

微模式化脱细胞ECM作为生物活性表面,引导细胞定向、增殖和迁移

ty10086 提交于 周三, 08/25/2021 - 16:58
生物活性表面和材料在多种组织工程应用中显示出巨大潜力,但往往难以完全模拟复杂的身体系统。细胞外基质( ECM )是所有组织中重要的生物活性成分,最近被确定为一种潜在的溶液,可与生物材料结合使用。在组织工程中,ECM可以通过使用对再生过程至关重要的生化和生物力学线索,在各种应用中得到应用。然而,维持天然细胞分泌的ECM的维度、空间取向和蛋白质组成的可行解决方案在组织工程中仍然具有挑战性。因此,本工作采用软光刻技术制造了具有三维性质的微图形化聚二甲基硅氧烷( PDMS )基底,以控制细胞的黏附和对准。细胞排列在微图案的PDMS上,分泌和组装ECM,并脱细胞产生排列的基质生物材料。与对照组相比,接种到去细胞化、模式化ECM上的细胞表现出高度的排列和沿模式迁移。这项工作开始为阐明天然细胞分泌的ECM在指导细胞功能方面的巨大潜力奠定基础,并为将天然生物活性成分纳入新兴的组织工程技术提供进一步指导。

EndOxy:内皮细胞在PDMS气体交换膜上的中期稳定性和抗剪切应力

ty10086 提交于 周三, 08/25/2021 - 16:52
摘要\n内皮化氧合器装置( EndOxy )具有生理、非致血栓和抗炎性表面,有可能克服目前常规体外膜氧合的缺点,如血栓栓塞和出血等并发症,恶化足够的长期血液相容性。气体交换膜的内皮化,从而形成非致血栓和抗炎表面的方法是很有前景的。本研究考察了动态条件下RGD-聚二甲基硅氧烷( RGD- PDMS )气体交换膜上内皮细胞的中期抗剪切应力、气体传递速率和细胞密度。将人脐静脉内皮细胞接种于RGD- PDMS上,在微流控生物反应器中暴露于特定的剪切应力。采用亮场显微镜和免疫细胞化学方法评估内皮细胞形态。此外,对空白、RGD -共轭和内皮化PDMS增氧膜进行了气体转移测试。RGD- PDMS气体交换膜在2.9 dyn / cm2的壁面剪切应力下最多可用于内皮细胞的动态培养21 d,且细胞在2.9 dyn / cm2和5.7 dyn / cm2的前期动态预培养每隔1 h可抵抗高达8.6 dyn / cm2的壁面剪切应力,在2.9 dyn / cm2的前期动态预培养3 d和5.7 dyn / cm2的前期动态预培养1 h可耐受8.6 dyn / cm2的壁面剪切应力,保持细胞完整性。气体传递( GT )试验表明,RGD- PDMS的RGD共轭和内皮化均不能显著降低短期内膜的气体传递速率。动态培养内皮细胞至少72小时气体转移率稳定。