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Auto-degradable and biocompatible superparamagnetic iron oxide nanoparticles/polypeptides colloidal polyion complexes with high density of magnetic material

机译:具有高密度磁性材料的可自降解且生物相容的超顺磁性氧化铁纳米颗粒/多肽胶体聚离子复合物

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Hypothesis: Superparamagnetic iron oxide nanoparticles (SPIONs) are extensively used as building block of colloidal nanocomposites for biomedical applications. Strategies employed to embed them in a biodegradable and biocompatible polymer matrix often fail to achieve a high density of loading which would greatly benefit to applications such as imaging and hyperthermia. In this study, poly(acrylic acid) coated SPION (gamma-Fe2O3-PAA) are self-assembled with hydrolysable poly(serine ester) by electrostatic complexation, leading to perfectly defined spherical particles with ultra-high density of magnetic material and an ability to auto-degrade into individual SPION and biocompatible byproducts.Experiments: Self-assembly and auto-degradation of gamma-Fe(2)O(3)PAA/poly(serine ester) and gamma-Fe2O3-PAA/poly (serine ester)-b-PEG colloidal particles are studied by light scattering and microscopy. Colloidal stability in biofluids, hyperthermia under alternating magnetic field, cellular uptake, cytotoxicity and degradation of gamma-Fe2O3-PAA/poly(serine ester)-b-PEG in living cells are investigated.Findings: A remarkably slow electrostatic complexation leads to dense superparamagnetic gamma-Fe2O3-PAA/poly (serine ester)-b-PEG polyion complexes (PICs) with controlled sizes (150-500 nm) and times of degradation in aqueous solvents (700-5000 h). The material shows good sustainability during hyperthermia, is well taken up by MC3T3 cells and non-cytotoxic. TEM images reveal a mechanism of degradation by "peeling" and fragmentation. In cells, PICs are reduced into individual SPIONs within 72 h.
机译:假设:超顺磁性氧化铁纳米粒子(SPIONs)被广泛用作生物医学应用的胶体纳米复合材料的组成部分。将其嵌入可生物降解和生物相容性聚合物基质中的策略通常无法实现高负载密度,这将极大地有利于诸如成像和热疗等应用。在这项研究中,通过静电络合,将聚丙烯酸涂布的SPION(γ-Fe2O3-PAA)与可水解聚丝氨酸酯自组装,从而形成具有超高密度磁性材料和能力的完美定义的球形颗粒可自动降解为单个SPION和生物相容性副产物。实验:γ-Fe(2)O(3)PAA /聚(丝氨酸酯)和γ-Fe2O3-PAA/聚(丝氨酸酯)的自组装和自动降解-b-PEG胶体粒子通过光散射和显微镜研究。研究了生物流体中的胶体稳定性,交变磁场下的高温,细胞吸收,细胞毒性以及活细胞中γ-Fe2O3-PAA/聚(丝氨酸酯)-b-PEG的降解情况。发现:明显缓慢的静电络合导致致密的超顺磁性γ-Fe2O3-PAA/聚(丝氨酸酯)-b-PEG聚离子复合物(PICs),具有可控制的尺寸(150-500 nm)和在水性溶剂中的降解时间(700-5000 h)。该材料在热疗期间显示出良好的可持续性,被MC3T3细胞很好地吸收并且无细胞毒性。 TEM图像揭示了“剥离”和破碎的降解机理。在细胞中,PIC在72小时内被还原成单个SPION。

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