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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Heparin and non-heparin-like dextrans differentially modulate endothelial cell proliferation
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Heparin and non-heparin-like dextrans differentially modulate endothelial cell proliferation

机译:肝素和非肝素样右旋糖酐差异调节内皮细胞增殖

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Proliferation of endothelial cells (ECs) is a cellular step of particular importance for implanted cardiovascular biomaterials. Heparin and some synthetic water-soluble non-anticoagulant polysaccharides derived from dextran and bearing anionic carboxymethyl and hydrophobic benzylamine groups were first investigated for their effects on LC proliferation in vitro. The results assessed by cell counting, ~3H-thymidine uptake, and flow cytometry analysis, showed that the derivatized dextran-bearing hydrophobic groups stimulated the EC growth in the presence of serum, whereas native dextran or dextran-bearing anionic carboxymethyl groups were inactive and heparin was slightly inhibitory. Then, we showed that the derivatized dextran enhanced FC proliferation by potentiation of the mitogenic activities of vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (FGF-2), two potent EC growth factors. In the presence of 2 nM of derivatized dextran, a 3-fold and 13-fold increase of 3H-thymidine uptake was obtained with VEGF and FGF-2, respectively. Finally, proliferation of ECs was investigated on crosslinked gels made of polysaccharides. It is of interest that EC proliferation was higher on gels containing the derivatized dextran than on plain hydrogels, and heparinized gels inhibited cell proliferation. From the obtained results, we propose that the synthetic non-heparin-like dextran may be of interest as a coating for the endothelialization of cardiovascular biomaterials.
机译:内皮细胞(ECs)的增殖对于植入的心血管生物材料而言是特别重要的细胞步骤。首先研究了肝素和一些衍生自右旋糖酐并带有阴离子羧甲基和疏水苄胺基团的合成水溶性非抗凝多糖在体外对LC增殖的影响。通过细胞计数,〜3H-胸苷摄取和流式细胞仪分析评估的结果表明,在血清存在下,衍生的带有葡聚糖的疏水基团刺激了EC的生长,而天然葡聚糖或带有葡聚糖的阴离子羧甲基则没有活性,肝素略有抑制作用。然后,我们表明,衍生化的葡聚糖通过增强血管内皮生长因子(VEGF)和碱性成纤维细胞生长因子(FGF-2)(两种有效的EC生长因子)的促有丝分裂活性来增强FC增殖。在存在2 nM衍生葡聚糖的情况下,分别用VEGF和FGF-2获得3H-胸腺嘧啶核苷摄取的3倍和13倍增加。最后,在由多糖制成的交联凝胶上研究了ECs的增殖。令人感兴趣的是,含有衍生葡聚糖的凝胶的EC增殖要比普通水凝胶高,而肝素化的凝胶抑制细胞增殖。从获得的结果,我们建议合成的非肝素样葡聚糖可能作为心血管生物材料内皮化的涂层是令人感兴趣的。

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