细胞外基质模拟水凝胶中大分子的扩散——大小和电荷的影响。

IF 4.7 3区 医学 Q1 PHARMACOLOGY & PHARMACY
Julia Parlow , Eva Pet , Anna Smirnova , Enamul Mojumdar , Helen Sjögren , Per Hansson
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引用次数: 0

摘要

皮下注射是治疗性蛋白质和多肽口服给药的主要替代方案。然而,生物利用度和吸收率往往是可变的,难以预测。因此,需要新的具有生物相关性和预测性的体外SC方法。在这项研究中,我们系统地研究了大分子的大小和电荷对其在细胞外基质(ECM)模拟水凝胶中的分配和扩散的影响,以便深入了解细胞外基质成分与SC注射后影响药物吸收的相互作用。制备由琼脂糖、交联胶原蛋白和透明质酸(HA)或交联HA组成的水凝胶,并在不同大小(4至150 kDa)的fitc -葡聚糖溶液和不同净电荷(+2至+9)的模型肽溶液中进行平衡。采用共聚焦激光扫描显微镜和光漂白后荧光恢复(FRAP)测定凝胶和溶液内的分配和扩散系数,并与理论模型进行比较。一般来说,凝胶内部的分配和扩散率随着分子量的增加而降低,这与描述凝胶网络阻塞效应的模型很好地吻合,该模型修正了凝胶结构的非均质性。阳离子多肽在带相反电荷的凝胶中富集,其扩散系数随多肽电荷的增加而降低。实验结果与本文提出的静电模型有半定量的一致性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Diffusion of macromolecules in extracellular matrix mimetic hydrogels – effect of size and charge

Diffusion of macromolecules in extracellular matrix mimetic hydrogels – effect of size and charge
Subcutaneous (SC) injection is the primary alternative to oral administration for therapeutic proteins and peptides. However, bioavailability and absorption rate are often variable and difficult to predict. Therefore, there is a need for new biorelevant and predictive SC in vitro methods. In this study we systematically investigate the effect of size and charge of a macromolecule on its partitioning and diffusion within extracellular matrix (ECM) mimetic hydrogels in order to gain insight on interactions with the components of the ECM affecting the absorption of a drug after SC injection. Hydrogels consisting of either agarose, cross-linked collagen and hyaluronic acid (HA) or cross-linked HA, were made and equilibrated in solutions of FITC-dextrans of varying sizes (4 to 150 kDa) and model peptides of varying net charge (+2 to +9). Partitioning and diffusion coefficients within gel and solution were determined using confocal laser scanning microscopy and fluorescence recovery after photo bleaching (FRAP), and compared to theoretical models. Generally, the partitioning and diffusivities within the gels decreased with increasing molecular weight, which was in good agreement with models describing the effect of obstruction of the gel network corrected for heterogeneity in the gel structure. The cationic peptides were enriched in the oppositely charged gels and their diffusivities decreased with increasing peptide charge. The experimental results were in semi quantitative agreement with an electrostatic model presented in this work.
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来源期刊
CiteScore
9.60
自引率
2.20%
发文量
248
审稿时长
50 days
期刊介绍: The journal publishes research articles, review articles and scientific commentaries on all aspects of the pharmaceutical sciences with emphasis on conceptual novelty and scientific quality. The Editors welcome articles in this multidisciplinary field, with a focus on topics relevant for drug discovery and development. More specifically, the Journal publishes reports on medicinal chemistry, pharmacology, drug absorption and metabolism, pharmacokinetics and pharmacodynamics, pharmaceutical and biomedical analysis, drug delivery (including gene delivery), drug targeting, pharmaceutical technology, pharmaceutical biotechnology and clinical drug evaluation. The journal will typically not give priority to manuscripts focusing primarily on organic synthesis, natural products, adaptation of analytical approaches, or discussions pertaining to drug policy making. Scientific commentaries and review articles are generally by invitation only or by consent of the Editors. Proceedings of scientific meetings may be published as special issues or supplements to the Journal.
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