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Preparation and characterization of chitosan microspheres for controlled release of synthetic oligopeptide derived from BMP-2

机译:壳聚糖微球的制备和表征,用于控制释放源自BMP-2的合成寡肽

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摘要

The localized and temporally controlled release of growth factors is key to achieving optimal clinical efficacy. To achieve sustained delivery of a novel bone-induced growth factor, chitosan microspheres loaded with synthetic oligopeptide (S~([PO4])KIPKASSVPTELSAISTLYLDDD, P24) were prepared by an emulsion-ionic cross-linking method in the presence of tripolyphosphate, with bovine serum albumin (BSA) as a control. Both microspheres containing oligopeptide or BSA were of spherical shape with size ranging from 10-60 μm . The encapsulation efficiency was usually higher than 80% and the loading capacity was affected by initial protein dosage. From the release experiments, it was found that both proteins were slowly released from the microspheres over 7 days in a PBS solution (pH 7.4), in which the release rate of oligopeptide was much lower than that of BSA. Released oligopeptide was demonstrated to possess biological activity as evidenced by stimulation of rabbit marrow mesenchymal stem cells (MSCs) alkaline phosphatase (ALP) activity in vitro. These results indicate that the TPP-chitosan microspheres loaded with synthetic oligopeptide may possess potential application in bone tissue engineering.
机译:生长因子的局部和暂时控制释放是获得最佳临床疗效的关键。为了实现新型骨诱导生长因子的持续递送,在三聚磷酸盐存在下,通过乳液-离子交联法制备了负载有合成寡肽(S〜([PO4])KIPKASSVPTELSAISTLYLDDD,P24)的壳聚糖微球。血清白蛋白(BSA)作为对照。含有寡肽或BSA的两个微球均为球形,尺寸在10-60μm之间。包封效率通常高于80%,并且载量受初始蛋白质剂量的影响。从释放实验中发现,两种蛋白质均在PBS溶液(pH 7.4)中经过7天从微球中缓慢释放,其中寡肽的释放速率远低于BSA。体外刺激兔骨髓间充质干细胞(MSCs)碱性磷酸酶(ALP)活性证明了释放的寡肽具有生物活性。这些结果表明,载有合成寡肽的TPP-壳聚糖微球可能在骨组织工程中具有潜在的应用。

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