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Enhanced cellular uptake of iron oxide nanoparticles modified with 1,2-dimyristoyl-sn-glycero-3-phosphocholine

机译:1,2-二肉豆蔻酰基- sn -甘油-3-磷酸胆碱修饰的氧化铁纳米颗粒的细胞摄取增强

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It is important for nanoparticles to enter cells to implement their biological applications. We synthesized and characterized superparamagnetic iron oxide nanoparticles (SPIONs) modified with poly(ethylene glycol) (PEG) and polyethyleneimine (PEI) (PEG/PEI-SPIONs), and further with 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) (DMPC-SPIONs) to improve their intracellular uptake. The nanoparticles internalized into PC-12 cells were observed by transmission electron microscopy (TEM) and quantified by inductively coupled plasma emission spectroscopy (ICP-OES). There was a much greater uptake of DMPC-SPIONs than PEG/PEI-SPIONs into PC-12 cells and remarkable amounts of accumulated nanoparticles were found in the lysosome, endoplasmic reticulum, mitochondria, vesicles, and around the nucleus, and some nanoparticles remained on the cell membrane. This can be attributed to the similarity between the chemical structures of DMPC and membrane phospholipids which result in the fusion of DMPC and cell membranes. Our results encourage further research on DMPC-SPIONs as drug carriers, transfection agents, MRI contrast agents for cells and hyperthermia agents.
机译:纳米颗粒进入细胞以实现其生物学应用非常重要。我们合成并表征了用聚乙二醇(PEG)和聚乙烯亚胺(PEI)(PEG / PEI-SPIONs)以及进一步用1,2-二肉豆蔻酰- sn 修饰的超顺磁性氧化铁纳米颗粒(SPION) >-甘油-3-磷酸胆碱(DMPC)(DMPC-SPIONs),以改善其细胞内摄取。通过透射电子显微镜(TEM)观察内化到PC-12细胞中的纳米颗粒,并通过电感耦合等离子体发射光谱(ICP-OES)进行定量。与PEG / PEI-SPIONs相比,PC-12细胞对DMPC-SPIONs的吸收要大得多,并且在溶酶体,内质网,线粒体,囊泡和细胞核周围发现了大量的纳米颗粒,并且某些纳米颗粒仍保留在细胞膜。这可以归因于DMPC和膜磷脂的化学结构之间的相似性,从而导致DMPC和细胞膜融合。我们的结果鼓励人们进一步研究作为药物载体,转染剂,细胞的MRI造影剂和热疗剂的DMPC-SPIONs。

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