Spatial Distribution of Biomaterial Microenvironment pH and Its Modulatory Effect on Osteoclasts at the Early Stage of Bone Defect Regeneration

破骨细胞 生物材料 材料科学 再生(生物学) 生物物理学 吸收 骨吸收 化学 细胞生物学 纳米技术 生物化学 体外 生物 内分泌学
作者
Wenlong Liu,Xiuli Dan,William W. Lu,Xiaoli Zhao,Changshun Ruan,Ting Wang,Xu Cui,Xinyun Zhai,Yufei Ma,Deping Wang,Wenhai Huang,Haobo Pan
出处
期刊:ACS Applied Materials & Interfaces [American Chemical Society]
卷期号:11 (9): 9557-9572 被引量:50
标识
DOI:10.1021/acsami.8b20580
摘要

It is generally accepted that biodegradable materials greatly influence the nearby microenvironment where cells reside; however, the range of interfacial properties has seldom been discussed due to technical bottlenecks. This study aims to depict biomaterial microenvironment boundaries by correlating interfacial H+ distribution with surrounding cell behaviors. Using a disuse-related osteoporotic mouse model, we confirmed that the abnormal activated osteoclasts could be suppressed under relatively alkaline conditions. The differentiation and apatite-resorption capability of osteoclasts were “switched off” when cultured in titrated material extracts with pH values higher than 7.8. To generate a localized alkaline microenvironment, a series of borosilicates were fabricated and their interfacial H+ distributions were monitored spatiotemporally by employing noninvasive microtest technology. By correlating interfacial H+ distribution with osteoclast “switch on/off” behavior, the microenvironment boundary of the tested material was found to be 400 ± 50 μm, which is broader than the generally accepted value, 300 μm. Furthermore, osteoporotic mice implanted with materials with higher interfacial pH values and boarder effective ranges had lower osteoclast activities and a thicker new bone. To conclude, effective proton microenvironment boundaries of degradable biomaterials were depicted and a weak alkaline microenvironment was shown to promote regeneration of osteoporotic bones possibly by suppressing abnormal activated osteoclasts.
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