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Controlled release of NELL-1 protein from chitosan/hydroxyapatite-modified TCP particles

机译:NELL-1蛋白从壳聚糖/羟基磷灰石修饰的TCP颗粒中的受控释放

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摘要

NEL-like molecule-1 (NELL-1) is a novel osteogenic protein that showing high specificity to osteochondral cells. It was widely used in bone regeneration research by loading onto carriers such as tricalcium phosphate (TCP) particles. However, there has been little research on protein controlled release from this material and its potential application. In this study, TCP was first modified with a hydroxyapatite coating followed by a chitosan coating to prepare chitosan/hydroxyapatite-coated TCP particles (Chi/HA-TCP). The preparation was characterized by SEM, EDX, FTIR, XRD, FM and Zeta potential measurements. The NELL-1 loaded Chi/HA-TCP particles and the release kinetics were investigated in vitro. It was observed that the Chi/HA-TCP particles prepared with the 0.3% (wt/wt) chitosan solution were able to successfully control the release of NELL-1 and maintain a slow, steady release for up to 28 days. Furthermore, more than 78% of the loaded protein’s bioactivity was preserved in Chi/HA-TCP particles over the period of the investigation, which was significantly higher than that of the protein released from hydroxyapatite coated TCP (HA-TCP) particles. Collectively, this study suggests that the osteogenic protein NELL-1 showed a sustained release pattern after being encapsulated into the modified Chi/HA-TCP particles, and the NELL-1 integrated composite of Chi/HA-TCP showed a potential to function as a protein delivery carrier and as an improved bone matrix for use in bone regeneration research.
机译:NEL样分子1(NELL-1)是一种新型的成骨蛋白,对骨软骨细胞具有高度特异性。通过将其装载到诸如磷酸三钙(TCP)颗粒之类的载体上,它被广泛用于骨骼再生研究。但是,关于这种材料的蛋白质控释及其潜在应用的研究很少。在这项研究中,首先先用羟基磷灰石涂层改性TCP,再用脱乙酰壳多糖涂层改性,以制备脱乙酰壳多糖/羟基磷灰石涂层的TCP颗粒(Chi / HA-TCP)。通过SEM,EDX,FTIR,XRD,FM和Zeta电势测量对制剂进行表征。体外研究了装载NELL-1的Chi / HA-TCP颗粒和释放动力学。观察到,用0.3%(wt / wt)的壳聚糖溶液制备的Chi / HA-TCP颗粒能够成功控制NELL-1的释放并保持缓慢稳定的释放长达28天。此外,在整个研究期间,Chi / HA-TCP颗粒中保留了超过78%的负载蛋白生物活性,这明显高于从羟基磷灰石包裹的TCP(HA-TCP)颗粒中释放的蛋白质。总的来说,这项研究表明,成骨蛋白NELL-1被包封到修饰的Chi / HA-TCP颗粒中后显示出持续释放的模式,并且NELL-1整合的Chi / HA-TCP的复合材料显示出有可能作为蛋白质输送载体,并作为改良的骨基质用于骨再生研究。

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