超顺磁性氧化铁纳米粒子(superparamagnetic iron oxide nanoparticle, SPION)由于其独特的性质,如低毒、生物相容性、强大的磁性,以及在多功能模式中的优越作用,在肿瘤诊断、构建多模态肿瘤分子影像探针及治疗方面展现出巨大的潜力,今...超顺磁性氧化铁纳米粒子(superparamagnetic iron oxide nanoparticle, SPION)由于其独特的性质,如低毒、生物相容性、强大的磁性,以及在多功能模式中的优越作用,在肿瘤诊断、构建多模态肿瘤分子影像探针及治疗方面展现出巨大的潜力,今后可以在临床上提高肿瘤诊断的特异性、敏感性,实现诊疗一体化,本文从SPION的成像机制、合成方法出发,阐述近年来SPION在肿瘤的各种靶向成像、多模态成像和治疗方面的研究进展,展望未来SPION在肿瘤诊断及治疗中的发展前景,旨在为更好地构建基于SPION的新型诊疗一体化肿瘤探针提供参考。展开更多
The present paper covers a novel technology for the concentration of trace amounts of target oligonucleotide from the solution. This technique is based on a super-paramagnetic DNA nano-enricher constructed with a sing...The present paper covers a novel technology for the concentration of trace amounts of target oligonucleotide from the solution. This technique is based on a super-paramagnetic DNA nano-enricher constructed with a single strand DNA probe immobilized onto the surface of the super-paramagnetic nanoparticles prepared by using the water-in-oil microemulsion technique, employing silica as the shell and iron oxide as the core of the super-paramagnetic nanoparticles. The silica coated magnetic nanoparticles are (40±4) nm in size. And the magnetic nanoparticle is super-paramagnetic. Biotin labeled ssDNA(Biotin-5-(A)10-GAT-TCA-CGA-GGC-CCT-AGT-CG-3) was immobilized on the surface of silica coated magnetic nanoparticles. The complementary ssDNA could be enriched effectively and the characteristics of the enriched ssDNA have not changed, which will provide a novel technique and measurement for gene transfection, mutation detection, gene diagnosis, gene therapy and so on.展开更多
目的制备超顺磁性硫酸链霉素-聚乳酸-聚乙二醇(PELA)微球(superparamagnetic chitosan streptomycin PELA micro-spheres,spCSPM),研究此微球的特性,并对其在振荡磁场作用下体外药物释放规律进行研究。方法用化学共沉淀法合成纳米超顺磁...目的制备超顺磁性硫酸链霉素-聚乳酸-聚乙二醇(PELA)微球(superparamagnetic chitosan streptomycin PELA micro-spheres,spCSPM),研究此微球的特性,并对其在振荡磁场作用下体外药物释放规律进行研究。方法用化学共沉淀法合成纳米超顺磁Fe304壳聚糖纳米粒(superparamagnetic chitosan Fe3O4 nanospheres,spFCN),再用双乳化(W/O/W)溶剂蒸发法制备spCSPM。将spCSPM混合入兔血中形成血凝块,在37℃模拟体液中进行体外药物溶出试验,用振荡磁场干预,用酶联免疫法(ELISA)检测硫酸链霉素的释放量。结果振荡磁场能够增加spCSPM血凝块中链霉素释放速率,与非磁性的壳聚糖聚乳酸-聚乙二醇(PELA)微球(chitosan streptomycin PELA microspheres,CSPM)相比,26d时使药物释放量提高3倍左右。结论spCSPM具有药物缓释功能,振荡磁场可重复性增加体系中药物的溶出,此体系药物缓释周期超过三周。展开更多
文摘目的制备新型栓塞剂——超顺磁性碘油(SPLIP),观察其用于经导管动脉栓塞(TAE)治疗兔VX2肝癌模型的安全性、有效性及MRI所示TAE栓塞肿瘤效果。方法制备新型栓塞剂SPLIP,观察其稳定性,比较制备当日与第30天MRI所示体外SPLIP T1和T2值。分别将10只健康雄性新西兰大白兔随机分为SPLIP组和常规碘油(C-LIP)组(每组5只)、10只雄性新西兰大白兔VX2肝癌模型随机分为SPLIP-A组和C-LIP-A组(每组5只),行TAE,对SPLIP组和SPLIP-A组注入0.6 ml SPLIP,C-LIP组和C-LIP-A组注入等量C-LIP,2周后对SPLIP-A组和C-LIP-A组行上腹部平扫CT及MRI,观察肿瘤影像学表现,评估SPLIP用于TAE治疗VX2肝癌模型兔效果;对比各组兔TAE前及2周后血清谷丙转氨酶(GPT)、谷草转氨酶(GOT)、血尿素氮(BUN)及肌酐(Cr)变化。结果所获SPLIP性质稳定;体外MR T1WI和T2WI均无信号,制备当日与第30天T1及T2信号值差异均无统计学意义(P均>0.05)。治疗后2周,SPLIP组与C-LIP组GPT、GOT、BUN及Cr均与治疗前差异无统计学意义(P均>0.05);MRI所示SPLIP-A组及C-LIP-A组碘油沉积范围及栓塞肿瘤效果与CT相符。结论SPLIP用于TAE治疗兔VX2肝癌模型安全、有效;利用MRI可清晰显示其栓塞肿瘤效果。
文摘超顺磁性氧化铁纳米粒子(superparamagnetic iron oxide nanoparticle, SPION)由于其独特的性质,如低毒、生物相容性、强大的磁性,以及在多功能模式中的优越作用,在肿瘤诊断、构建多模态肿瘤分子影像探针及治疗方面展现出巨大的潜力,今后可以在临床上提高肿瘤诊断的特异性、敏感性,实现诊疗一体化,本文从SPION的成像机制、合成方法出发,阐述近年来SPION在肿瘤的各种靶向成像、多模态成像和治疗方面的研究进展,展望未来SPION在肿瘤诊断及治疗中的发展前景,旨在为更好地构建基于SPION的新型诊疗一体化肿瘤探针提供参考。
文摘The present paper covers a novel technology for the concentration of trace amounts of target oligonucleotide from the solution. This technique is based on a super-paramagnetic DNA nano-enricher constructed with a single strand DNA probe immobilized onto the surface of the super-paramagnetic nanoparticles prepared by using the water-in-oil microemulsion technique, employing silica as the shell and iron oxide as the core of the super-paramagnetic nanoparticles. The silica coated magnetic nanoparticles are (40±4) nm in size. And the magnetic nanoparticle is super-paramagnetic. Biotin labeled ssDNA(Biotin-5-(A)10-GAT-TCA-CGA-GGC-CCT-AGT-CG-3) was immobilized on the surface of silica coated magnetic nanoparticles. The complementary ssDNA could be enriched effectively and the characteristics of the enriched ssDNA have not changed, which will provide a novel technique and measurement for gene transfection, mutation detection, gene diagnosis, gene therapy and so on.
