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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Biomimetic PMMA-based bone substitutes: A comparative in vitro evaluation of the effects of pulsed electromagnetic field exposure
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Biomimetic PMMA-based bone substitutes: A comparative in vitro evaluation of the effects of pulsed electromagnetic field exposure

机译:基于仿生PMMA的骨替代品:脉冲电磁场​​暴露影响的体外比较评估

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摘要

Pulsed electromagnetic fields (PEMFs) are known to be effective in the stimulation of cultured osteoblasts and in vivo healing of delayed and nonunion fractures. In the present in vitro study the effects of PEMFs on osteoblastic cell cultures (MG63 human osteoblast-like cells) grown in the presence of poly-methylmethacrylate (PMMA) and of a biomimetic bone substitute made of a PMMA matrix added with alfa-tricalcium phosphate (PMMA+alpha-TCP) were evaluated, to assess the biological response at the cell-biomaterial interaction. Cultures were stimulated with PEMFs (75 Hz, 2.3 mT, 1.3-ms pulse duration) 12 h/day for 3 days and evaluations (MTT, ALP, OC, PICP, TGF beta-1, IL-6) were performed at 3 and 6 days. PMMA had a negative effect on osteoblasts, whereas PMMA+alpha-TCP enhanced production of ALP, PICP, OC and TGF beta-1, and reduced IL-6 levels. Cells responded positively to PEMF stimulation even when cultured with a poorly biocompatible material, such as PMMA. This effect was more evident in the presence of PMMA+alpha-TCP (further improvement in proliferation and synthetic activity) both at 3 and at 6 days. The properties of PMMA+alpha-TCP look promising, and the present results support the use of PEMFs to improve tissue response to biomaterials implanted as bone substitutes.
机译:已知脉冲电磁场​​(PEMF)在刺激培养的成骨细胞以及延迟愈合和骨不连骨折的体内愈合方面有效。在目前的体外研究中,PEMFs对在聚甲基丙烯酸甲酯(PMMA)和由仿生骨替代物制成的成骨细胞培养物(MG63人成骨样细胞)的影响,仿生骨替代物是由添加有α-磷酸三钙的PMMA基质制成的(PMMA +α-TCP)进行了评估,以评估细胞-生物材料相互作用时的生物反应。用PEMF(75 Hz,2.3 mT,1.3-ms脉冲持续时间)12 h / day刺激培养物3天,并在3和5进行评估(MTT,ALP,OC,PICP,TGF beta-1,IL-6)。 6天PMMA对成骨细胞有负面影响,而PMMA +α-TCP增强了ALP,PICP,OC和TGF beta-1的产生,并降低了IL-6的水平。即使与生物相容性差的材料(如PMMA)一起培养,细胞也对PEMF刺激产生积极反应。在第3天和第6天都存在PMMA +α-TCP(进一步提高增殖和合成活性)时,这种效果更为明显。 PMMA +α-TCP的特性看起来很有希望,目前的结果支持使用PEMF改善组织对植入作为骨替代物的生物材料的反应。

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