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Stability and cell uptake of calcium carbonate templated insulin microparticles

机译:碳酸钙模板胰岛素微粒的稳定性和细胞吸收

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摘要

Therapeutic proteins are an integral part of today's pharmaceutical practice, but they still present challenges from the drug delivery point of view. In this work, a new approach is studied based on hard templating for fabrication of microparticles composed of pure insulin, which may enable effective delivery, for instance pulmonary delivery. The approach is both simple and versatile: the protein particles are prepared by selective precipitation into porous CaCO3 microtemplates, followed by full decomposition of the template at the isoelectric point of the protein (pH 5.2). Control over the main material parameters (mechanical properties, porosity, morphology and stability at physiological conditions) are critical for the envisioned application in drug delivery. It is demonstrated that these critical parameters can be significantly tuned by a slight final pH variation around the isoelectric point (pH range 4-6) and by the denaturation degree of insulin. Electrostatic interactions and inter-protein crosslinking in the protein particles as well as their internal structure are considered, to explain the variation in the particle properties. The particle property parameters are explored using atomic force microscopy, optical microscopy and circular dichroism spectra. Finally, phagocytic clearance of the protein particles in vitro was studied to explore possible enhancements in particle fabrication to improve the efficiency of insulin delivery by inhalation.
机译:治疗性蛋白质是当今药物实践的一个组成部分,但它们仍然从药物交付的角度出现挑战。在这项工作中,基于用于制备由纯胰岛素组成的微粒的硬模板进行了新方法,这可以实现有效递送,例如肺递送。该方法既简单又通用:蛋白质颗粒通过选择性沉淀成多孔的CaCO 3微直接,然后在蛋白质的等电点(pH5.2)中的样板完全分解。对主要物质参数(在生理条件下的机械性质,孔隙,形态和稳定性上的控制对药物递送中设想的应用至关重要。证明这些关键参数可以通过围绕等电点(pH范围4-6)周围的轻微最终pH值和胰岛素的变性程度来显着调整这些关键参数。考虑蛋白质颗粒中的静电相互作用和蛋白质交联,以及其内部结构,以解释颗粒性质的变化。使用原子力显微镜,光学显微镜和圆形二色性光谱探索颗粒性能参数。最后,研究了体外蛋白质颗粒的吞噬清除,以探讨颗粒制造中的可能增强,以提高吸入胰岛素递送的效率。

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