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Development of biodegradable methylprednisolone microparticles for treatment of articular pathology using a spray-drying technique

机译:使用喷雾干燥技术开发可生物降解的甲基强的松龙微粒以治疗关节病变

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摘要

In this work, microparticles were prepared by spray-drying using albumin, chondroitin sulfate, and hyaluronic acid as excipients to create a controlled-release methylprednisolone system for use in inflammatory disorders such as arthritis. Scanning electron microscopy demonstrated that these microparticles were almost spherical, with development of surface wrinkling as the methylprednisolone load in the formulation was increased. The methylprednisolone load also had a direct influence on the mean diameter and zeta potential of the microparticles. Interactions between formulation excipients and the active drug were evaluated by x-ray diffraction, differential scanning calorimetry, and thermal gravimetric analysis, showing limited amounts of methylprednisolone in a crystalline state in the loaded microparticles. The encapsulation efficiency of methylprednisolone was approximately 89% in all formulations. The rate of methylprednisolone release from the microparticles depended on the initial drug load in the formulation. In vitro cytotoxic evaluation using THP-1 cells showed that none of the formulations prepared triggered an inflammatory response on release of interleukin-1β, nor did they affect cellular viability, except for the 9.1% methylprednisolone formulation, which was the maximum test concentration used. The microparticles developed in this study have characteristics amenable to a therapeutic role in inflammatory pathology, such as arthritis.
机译:在这项工作中,使用白蛋白,硫酸软骨素和透明质酸作为赋形剂,通过喷雾干燥来制备微粒,以产生用于炎症性疾病(如关节炎)的控释甲基强的松龙系统。扫描电子显微镜显示这些微粒几乎是球形的,随着制剂中甲基泼尼松龙负荷的增加,表面起皱的发展。甲基泼尼松龙的负载量也直接影响了微粒的平均直径和ζ电势。通过X射线衍射,差示扫描量热法和热重分析法评估了制剂赋形剂与活性药物之间的相互作用,结果表明在负载的微粒中结晶形式的甲基强的松龙数量​​有限。在所有配方中,甲基强的松龙的包封效率约为89%。甲基强的松龙从微粒中释放的速率取决于制剂中的初始药物负荷。使用THP-1细胞进行的体外细胞毒性评估显示,除9.1%的甲基强的松龙制剂(使用的最大测试浓度)外,制备的所有制剂均未触发白细胞介素-1β释放引起的炎症反应,也未影响细胞生存力。在这项研究中开发的微粒具有在炎症性疾病(如关节炎)中具有治疗作用的特征。

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