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中空纤维膜的整合提高了三维组织构建体的营养供应。

Integration of hollow fiber membranes improves nutrient supply in three-dimensional tissue constructs.

机构信息

MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, The Netherlands.

出版信息

Acta Biomater. 2011 Sep;7(9):3312-24. doi: 10.1016/j.actbio.2011.06.012. Epub 2011 Jun 14.

Abstract

Sufficient nutrient and oxygen transport is a potent modulator of cell proliferation in in vitro tissue-engineered constructs. The lack of oxygen and culture medium can create a potentially lethal environment and limit cellular metabolic activity and growth. Diffusion through scaffold and multi-cellular tissue typically limits transport in vitro, leading to potential hypoxic regions and reduction in the viable tissue thickness. For the in vitro generation of clinically relevant tissue-engineered grafts, current nutrient diffusion limitations should be addressed. Major approaches to overcoming these include culture with bioreactors, scaffolds with artificial microvasculature, oxygen carriers and pre-vascularization of the engineered tissues. This study focuses on the development and utilization of a new perfusion culture system to provide adequate nutrient delivery to cells within large three-dimensional (3D) scaffolds. Perfusion of oxygenated culture medium through porous hollow fiber (HF) integrated within 3D free form fabricated (FFF) scaffolds is proposed. Mouse pre-myoblast (C2C12) cells cultured on scaffolds of poly(ethylene-oxide-terephthalate)-poly(butylene-terephthalate) block copolymer (300PEOT55PBT45) integrated with porous HF membranes of modified poly(ether-sulfone) (mPES, Gambro GmbH) is used as a model system. Various parameters such as fiber transport properties, fiber spacing within a scaffold and medium flow conditions are optimized. The results show that four HF membranes integrated with the scaffold significantly improve the cell density and cell distribution. This study provides a basis for the development of a new HF perfusion culture methodology to overcome the limitations of nutrient diffusion in the culture of large 3D tissue constructs.

摘要

充足的营养和氧气输送是体外组织工程构建中细胞增殖的有力调节剂。缺乏氧气和培养基会造成潜在的致命环境,并限制细胞代谢活动和生长。通过支架和多细胞组织的扩散通常会限制体外的传输,导致潜在的缺氧区域和存活组织厚度减少。为了在体外生成临床上相关的组织工程移植物,目前应该解决营养扩散的限制问题。克服这些问题的主要方法包括使用生物反应器培养、具有人工微血管的支架、氧气载体和工程组织的预血管化。本研究专注于开发和利用新的灌注培养系统,为大型三维(3D)支架内的细胞提供充足的营养输送。提出通过多孔空心纤维(HF)向 3D 自由成型(FFF)支架内灌注充氧培养基。以聚(氧化乙烯-对苯二甲酸酯)-聚(丁二醇-对苯二甲酸酯)嵌段共聚物(300PEOT55PBT45)支架内集成的改性聚醚砜(mPES,Gambro GmbH)多孔 HF 膜上培养的小鼠前成肌细胞(C2C12)作为模型系统。优化了纤维传输特性、支架内纤维间距和介质流动条件等各种参数。结果表明,四个 HF 膜与支架集成可显著提高细胞密度和分布。本研究为开发新的 HF 灌注培养方法提供了基础,以克服大体积 3D 组织构建中营养扩散的限制。

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