首页> 外文期刊>Acta biomaterialia >A poly(L-lactic acid) nanofibre mesh scaffold for endothelial cells on vascular prostheses.
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A poly(L-lactic acid) nanofibre mesh scaffold for endothelial cells on vascular prostheses.

机译:一种聚(L-乳酸)纳米纤维网状支架,用于人工血管上的内皮细胞。

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The absence of neoendothelium covering the intimal surface of small-diameter PET vascular prostheses is known to be one cause of failure following implantation in humans. Protein coatings currently used to seal porous textile structures have not shown evidence of in vivo neoendothelium formation. In this study, we covered the inner wall of textile prostheses with a biodegradable synthetic scaffold made of poly(l-lactic) acid (PLLA) nanofibres obtained by an air-spinning process we developed that produces nanofibres by stretching a solution of polymer with a high-speed compressed air jet. The air spinning was designed to process a scaffold that would support good endothelial cell proliferation. Our innovative process enabled us to very rapidly cover textile samples with PLLA nanofibres to determine the influence of air pressure, polymer solution flow rate and polymer concentration on fibre quality. High air pressure was shown to induce a significant number of ruptures. High polymer flow rate stimulated the formation of polymer droplets, and the fibre diameter mean increased for the 4% and 7% polymer concentrations. The adherence and proliferation of bovine aortic endothelial cells was assessed to compare prosthesis samples with or without the PLLA nanofibre scaffold and PET film. The PLLA nanofibres displayed a significantly better proliferation rate, and enabled endothelial cells to proliferate in the monolayer. Our novel approach therefore opens the door to the development of partially degradable textile prostheses with a blood/textile interface that supports endothelial cell proliferation.
机译:众所周知,新血管内皮覆盖小直径PET血管假体的内膜表面是人类植入后失败的原因之一。当前用于密封多孔纺织品结构的蛋白质涂层尚未显示出体内新内皮形成的证据。在这项研究中,我们用一种可生物降解的合成支架覆盖了织物假体的内壁,该支架由聚(l-乳酸)(PLLA)纳米纤维制成,该支架是通过空气纺丝工艺制得的,该工艺通过将聚合物溶液拉伸成纳米纤维而制成纳米纤维。高速压缩空气射流。气流纺丝被设计为处理将支持良好的内皮细胞增殖的支架。我们的创新工艺使我们能够使用PLLA纳米纤维非常迅速地覆盖纺织品样品,从而确定气压,聚合物溶液流速和聚合物浓度对纤维质量的影响。高气压被证明会引起大量破裂。较高的聚合物流速刺激了聚合物液滴的形成,并且在4%和7%的聚合物浓度下,纤维直径均值增加了。评估牛主动脉内皮细胞的粘附和增殖,以比较具有或不具有PLLA纳米纤维支架和PET膜的假体样品。 PLLA纳米纤维显示出明显更高的增殖速率,并使内皮细胞能够在单层中增殖。因此,我们的新方法为具有血液/纺织界面支持内皮细胞增殖的部分可降解纺织品假体的开发打开了大门。

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