蚕丝蛋白——功能性生物材料

蚕丝自古以来是作为衣料服饰用品而开发利用的。而人们所熟知的手术用缝线,则已经反映了蚕丝用于非衣料领域的可能性,显示了蚕丝蛋白对人体的安全性、亲和性、无过敏反应等优点。现在,蚕丝蛋白质——丝素的特性已越来越为人们发现和认识,蚕丝作为新的生物材料的开发和应用,全方位地拓宽蚕丝市场,已为人们所共识。

Synthesis,characterization and biological activity in vitro of FeCrAl(f)/HA asymmetrical biological functionally gradient materials

FeCrAl(f)/HA biological functionally gradient materials(FGMs) were successfully fabricated by the hot pressing technique.Scanning electron microscope(SEM),energy dispersive spectrometer(EDS) and bending strength test machine were utilized to characterize the microstructure,component,mechanical properties and the formation of the Ca-deficient apatite on the surface of these materials.The results indicate that an asymmetrical FeCrAl(f)/HA FGM,consolidating powders prepared by mixing HA with 3%–15%(volume fraction) is successfully prepared.Both of the matrix and FeCrAl fiber are integrated very tightly and bite into each other very deeply.And counter diffusion takes place to some extent in two phase interfaces.The elemental compositions of the FeCrAl(f)/HA FGM change progressively.Ca and P contents increase gradually with immersion time increasing,and thereafter approach equilibrium.The bone-like apatite layer forms on the materials surface,which possesses benign bioactivity,and the favorable biocompatibility can provide potential firm fixation between FeCrAl(f)/HA asymmetrical FGM implants and human bone.

干细胞及其仿生基质微环境在关节软骨再生修复中的作用综述

关节软骨由于无神经、无血管的特性,一旦损伤,其自我修复十分困难。干细胞技术的发展为关节软骨再生提供了新的希望。当前,不同来源的干细胞及多种应用方式在关节软骨修复中展现出不同程度的治疗效果。然而,干细胞对其所处的微环境均有极强的敏感性,这使得越来越多的研究者开始关注通过生物功能性支架构建的仿生微环境来调控干细胞,进而加速软骨再生。本文主要讨论了软骨修复的干细胞来源、其应用手段及其协同仿生细胞微环境在关节软骨修复方面的治疗效果、机制和应用不足。希望对协同干细胞的功能性软骨修复支架的设计和优化提供更加切实的临床化研究思路。