血管–骨基质交互微流控芯片实验体系的构建及验证

    Construction and Validation of Blood Vessel-bone Matrix Interactive Microfluidic Chip Experimental System

    • 晚期糖基化终末产物(AGEs)是葡萄糖与骨胶原发生非酶糖基化交联的产物, 与失重性骨丢失的发生机制相关, 而其在骨基质中积聚的机制尚不明确. 微重力下流速较慢的L型骨微血管数量增加, 可能与AGEs在骨中的积聚有关. 为研究流速对血管内葡萄糖分子向骨基质的输运及AGEs生成的影响, 开发了体外模拟血管-骨交互界面的双层通道微流控芯片实验体系, 自研可长时连续定向供液的双注射泵系统搭载于芯片, 通过实验验证体系的生物相容性、稳定性及组织间交互性. 结果显示, 芯片内通道主要反应区液体应力分布均匀, 为层流流动; 加载2.88 mL·min–1和0.38 mL·min–1的高糖培养基72 h后, 芯片中内皮细胞可正常生长; 低流量比高流量的葡萄糖分子经微孔膜向下层胶原通道扩散的速率更高, 胶原中生成的AGEs更多. 本文构建的实验体系具有良好的生物相容性、长时运行稳定性及组织间交互性, 可为后续开展骨基质AGEs积聚的生物物理学机制奠定技术基础, 具备应用于空间生命科学研究的潜力.

       

      Abstract: Advanced Glycation End Products (AGEs) in bone matrix are the products of non-enzymatic glycation of glucose and collagen, which are closely related to the mechanism of weightless bone loss. However, how AGEs accumulate in bone matrix remains unclear. The type L microvessels with slower blood flow velocity were increased under microgravity, which may be related to the accumulation of AGEs in bone. To study the effects of flow velocity on the transport of intravascular glucose molecules into bone matrix and the formation of AGEs in bone matrix, a bilayer channel microfluidic chip experimental system was constructed to simulate the blood vessel-bone matrix interface in vitro. A self-developed double-injection-pump continuous directional liquid supply system was applied to the chip, and the biocompatibility, stability and interorganizational interactivity of the system were verified by experiments. The results show that the fluid stress distribution in the main region of the channel in fabricated chip is uniform, and the flow is laminar. The endothelial cells in microfluidic chips could grow normally after loading high sugar medium of 2.88 mL·min–1 and 0.38 mL·min–1 for 72 h, respectively. The diffusion rate of glucose molecules from to the lower collagen channel through the microporous membrane was higher under low flow rate loading than under high flow rate loading, and more AGEs generated in collagen. The experimental system constructed in this paper has excellent biocompatibility, long-term operational stability and interorganizational interactivity, which lays a technical foundation for further in-depth research on biophysical mechanisms related to AGEs accumulation in bone matrix, and has the potential to be applied to space life science research.

       

    /

    返回文章
    返回