Biomaterials:不同二氧化钛纳米管在氧化应激微环境中的成骨能力

2018-04-03 MedSci MedSci原创

氧化应激通常存在于骨退行性疾病(骨关节炎,骨质疏松症等)中,一些抗氧化剂具有增强骨生成的巨大潜力。在这项研究中,我们旨在体外研究各种二氧化钛纳米管(TNTs)的抗氧化性能,以筛选改善骨形成的理想大小,并揭示潜在的分子机制。 通过比较正常和氧化应激条件下的细胞行为,研究人员发现,在正常微环境中,小TNTs有利于成骨细胞的粘附和增殖,但大TNTs可大大增加成骨分化。然而,在H2O2(300μM)

氧化应激通常存在于骨退行性疾病(骨关节炎,骨质疏松症等)中,一些抗氧化剂具有增强骨生成的巨大潜力。在这项研究中,我们旨在体外研究各种二氧化钛纳米管(TNTs)的抗氧化性能,以筛选改善骨形成的理想大小,并揭示潜在的分子机制。

通过比较正常和氧化应激条件下的细胞行为,研究人员发现,在正常微环境中,小TNTs有利于成骨细胞的粘附和增殖,但大TNTs可大大增加成骨分化。然而,在H2O2(300μM)处理(模拟氧化应激)后,只有大TNTs样品与自然钛(对照)相比,表现出优异的成骨细胞粘附、存活和分化行为。

分子结果显示,大TNTs的氧化应激抗性与整合素α5β1(ITGα5β1)的高表达密切相关,其进一步上调抗凋亡蛋白质(p-FAK,p-Akt,p-FoxO3a和Bcl2),并下调促凋亡蛋白(Bax)的表达。此外,我们发现,在氧化应激条件下,Wnt信号(Wnt3a,Wnt5a,Lrp5,Lrp6和β-连环蛋白)在促进成骨细胞的成骨分化中起重要作用。

原始出处:

Yu Y, Shen X, et al., Osteogenesis potential of different titania nanotubes in oxidative stress microenvironment. Biomaterials. 2018 Mar 13;167:44-57. doi: 10.1016/j.biomaterials.2018.03.024.

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    2018-10-02 sunylz
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    2018-10-25 30397613
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    2018-04-05 zhaojie88
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