背景：低聚乙二醇富马酸酯水凝胶是一种具有良好生物相容性及可注射性和可降解性的生物材料。不同相对分子质量水凝胶之间的特性有所差异，将骨髓间充质干细胞包裹其中并诱导细胞成骨分化，相对分子质量相当的水凝胶更有利于细胞增殖和分化，所以采用该材料为骨组织工程支架提供了新的选择。目的：探讨不同相对分子质量的低聚乙二醇富马酸酯水凝胶材料体外包裹大鼠骨髓间充质干细胞的增殖和分化的影响。 方法：低聚乙二醇富马酸酯通过氧化还原基团引发系统产生交联，制备出相对分子质量为1000，3000，10000，35000的低聚乙二醇富马酸酯水凝胶，对水凝胶的溶胀和降解性能进行检测。将骨髓间充质 干细胞包裹到4种相对分子质量的水凝胶中，在成骨培养液中诱导1-3周，通过组织学染色(苏木精-伊红染色和茜素红染色)和免疫荧光染色检测水凝胶材料对骨髓间充质干细胞形态的影响以及成骨分化的效果。 结果与结论：①随着水凝胶相对分子质量的增加，成胶时间变短，凝胶的溶胀度明显增加，且随着时间的推移，水凝胶的降解速率与相对分子质量成正比；②细胞复合水凝胶支架材料的组织学与免疫荧光染色结果表明，细胞经过诱导后，在具有适当溶胀与降解特性的相对分子质量为3000与10000的水凝胶中所形成的矿化结节数量显著多于在其它两种相对分子质量中的，说明有利于细胞的增殖与分化；③结果表明，低聚乙二醇富马酸酯水凝胶具有良好的生物相容性，且相对分子质量为3000与10000的水凝胶对间充质干细胞的成骨分化有一定的良性调节作用。%BACKGROUND:Oligo(poly(ethylene glycol)fumarate) (OPF) hydrogel is a kind of biomaterial with good biocompatibility, injectability, and biodegradability. It is known that there are differences in the characteristics of hydrogels with different molecular weights. Under osteogenic induction, bone marrow mesenchymal stem cels encapsulated in the suitable molecular weight hydrogel have better proliferation and differentiation. Therefore, the use of OPF hydrogel provides new options for bone tissue-engineered scaffold. OBJECTIVE:To investigate the effect of OPF hydrogel with different molecular weights on the proliferation and differentiation of encapsulated rat bone marrow mesenchymal stem celsin vitro. METHODS: Four kinds of OPF hydrogels with molecular weights of 1 000, 3 000, 10 000 and 35 000 were developed by OPF crosslinking with a redox radical initiation system. Hydrogel sweling and degradation properties were detected. Afterwards, bone marrow mesenchymal stem cels encapsulated in different hydrogels were cultured in osteogenic medium for 1-3 weeks. The effects of hydrogels on morphplogy of bone marrow mesenchymal stem cels and osteogenic differentiation were detectedvia histological staining (hematoxylin-eosin staining and alizarin red staining) and immunofluorescence staining. RESULTS AND CONCLUSION: With the increase of molecular weight of hydrogels, the gelation time was shortened, the sweling ratio significantly increased, and the hydrogel degradation rate was proportional to the molecular weight. In addition, the number of mineralized nodules formed in 3 000 and 10 000 molecular weight hydrogels was more than that in the other hydrogels, indicating that hydrogels with appropriate sweling and degradation properties are beneficial to cel proliferation and differentiation. In conclusion, OPF hydrogels have good biocompatibility and hydrogels with 3 000 and 10 000 molecular weight play active regulatory roles in osteogenic differentiation of mesenchymal stem cels.
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