Macromolecular diffusion and release from self-assembled beta-hairpin peptide hydrogels.

Macromolecular diffusion and release from self-assembled beta-hairpin peptide hydrogels.
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DOI:
10.1016/j.biomaterials.2008.11.019
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发表时间:
2009-03
期刊:
影响因子:
14
通讯作者:
Schneider JP
Schneider JP
中科院分区:
工程技术1区
文献类型:
--
作者:
Branco MC;Pochan DJ;Wagner NJ;Schneider JP

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自组装肽水凝胶用于直接封装和可控释放不同大小和流体动力学直径的模型FITC-葡聚糖大分子。MAX 1和MAX 8是具有不同电荷状态的两种肽序列,其被设计为在生理缓冲液条件(pH 7.4,150 mM NaCl)下分子内折叠并自组装成水凝胶。当在葡聚糖或蛋白质探针存在下引发自组装时,这些大分子直接封装在凝胶中。使用光漂白后的荧光恢复(FRAP)和散装释放研究的自扩散研究表明,大分子的流动性内,并释放出来,这些凝胶可以通过改变水凝胶的网格尺寸调制。平均筛孔尺寸可以通过简单地改变用于构建凝胶的给定肽的浓度或通过改变肽序列来调节。此外,结果表明,大分子和肽网络之间的静电相互作用影响的流动性和释放。根据探针的大小,释放半衰期可以从8小时到一个多月不等。
Self-assembling peptide hydrogels are used to directly encapsulate and controllably release model FITC–dextran macromolecules of varying size and hydrodynamic diameters. MAX1 and MAX8 are two peptide sequences with different charge states that have been designed to intramolecularly fold and self assemble into hydrogels at physiological buffer conditions (pH 7.4, 150 mM NaCl). When self-assembly is initiated in the presence of dextran or protein probes, these macromolecules are directly encapsulated in the gel. Self-diffusion studies using fluorescence recovery after photobleaching (FRAP) and bulk release studies indicate that macromolecule mobility within, and release out of, these gels can be modulated by varying the hydrogel mesh size. The average mesh size can be modulated by simply varying the concentration of a given peptide used to construct the gel or by altering the peptide sequence. In addition, results suggest that electrostatic interactions between the macromolecules and the peptide network influence mobility and release. Depending on probe size, release half-lives can be varied from 8 h to over a month.
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