聚氨酯(PU)和聚四氟乙烯(PTFE)是两种常用的血液接触生物材料.该研究通过建立一个非接触的细胞共培养模型从而针对材料刺激血液单核细胞活化后诱导血栓的潜能进行评估.运用人脐静脉内皮细胞和人单核细胞系THP-1进行实验,首先将PU和PTFE与THP-1细胞直接接触,然后收集细胞上清液,用上清液培养人脐静脉内皮细胞,结果发现内皮细胞上调炎症趋化因子单核细胞趋化蛋白1(MCP-1),巨噬细胞炎症蛋白-1α(MIP-1α)的表达.为进一步探讨THP-1细胞在其中所起到的作用,用MTS试验研究细胞的增殖程度,用ELISA试验研究细胞所分泌的可溶性分子,结果发现这些材料能不同程度地刺激THP-1细胞增殖及活化,使其分泌细胞因子TNF-α及/或IL-1β.研究表明,与血液接触的生物材料可能通过作用于单核细胞,使其增殖及活化,分泌促炎症因子,使得内皮细胞发生炎性激活,最终导致血栓形成.
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