One-pot preparation of nanodispersion with readily available components for localized tumor photothermal and photodynamic therapy

Photothermal(PTT) and photodynamic(PDT) combined therapy has been hindered to clinical translation, due to the lack of available biomaterials, difficult designs of functions,and complex chemical synthetic or preparation procedures. To actualize a high-efficiency combination therapy for cancer via a feasible approach, three readily available materials are simply associated together in one-pot, namely the single-walled carbon nanohorns(SWCNH), zinc phthalocyanine(ZnPc), and surfactant TPGS. The established nanodispersion is recorded as PCT. The association of SWCNH/ZnPc/TPGS was confirmed by energy dispersive spectrum, Raman spectrum and thermogravimetric analysis. Under lighting, PCT induced a temperature rising up to about 60 ℃ due to the presence of SWCNH, production a 7-folds of singlet oxygen level elevation because of ZnPc, which destroyed almost all4T1 tumor cells in vitro. The photothermal effect of PCT depended on both laser intensity and nanodispersion concentration in a linear and nonlinear manner, respectively. After a single peritumoral injection in mice and laser treatment, PCT exhibited the highest tumor temperature rise(to 65 ℃) among all test groups, completely destroyed primary tumor without obvious toxicity, and inhibited distant site tumor. Generally, this study demonstrated the high potential of PCT nanodispersion in tumor combined therapy.

Caco-2/EAhy926细胞串联复合模型用于Fe_3O_4纳米粒跨膜转运机制的研究（英文）

为了模拟肠道小肠上皮-血管屏障,我们建立了一个基于肠道生理结构的Caco-2/EAhy926串联复合模型。基于此模型,我们对纳米粒的跨膜转运进行了研究,并且与传统小肠上皮细胞模型做了比较。本研究中,使用粒径为30 nm左右的Fe_3O_4纳米粒作为模式制剂开展研究,它有着均匀的粒径分布和很好的单分散性。在孵育浓度下,此制剂对Caco-2细胞和EAhy926细胞几乎没有毒性。Caco-2/EAhy926串联复合模型是通过将Caco-2细胞单层和EAhy926细胞单层连接建立的。基于FD4渗透和跨膜电阻(TEER)的研究表明,在一定的培养时间范围内,所有的细胞模型都能保持完整。使用Claudin-4和VE Cadherin,验证了紧密连接的存在。F-actin微丝蛋白的完整性表明了存在着良好的细胞内连接。研究表明,与Caco-2模型和EAhy926模型相比,串联模型对FD4和Fe_3O_4纳米粒的转运造成了更大的阻碍。并且发现,EAhy926细胞单层有着很好的渗透性,串联模型对纳米材料的阻碍主要是由于Caco-2细胞单层。总的来说,此串联复合模型使我们能够同时对纳米粒在小肠上皮层和内皮层的转运进行评价,提供了一个研究小肠生物-纳米相互作用的好方法。