Redox-Responsive Porphyrin-Based Polysilsesquioxane Nanoparticles for Photodynamic Therapy of Cancer Cells
作者:Daniel Vega、Patrick Lodge、Juan Vivero-Escoto
DOI:10.3390/ijms17010056
日期:——
The development of stimulus-responsive photosensitizer delivery systems that carry a high payload of photosensitizers is of great importance in photodynamic therapy. In this study, redox-responsive polysilsesquioxane nanoparticles (PSilQNPs) built by a reverse microemulsion approach using 5,10,15,20-tetrakis(carboxyphenyl) porphyrin (TCPP) silane derivatives as building blocks, were successfully fabricated. The structural properties of TCPP-PSilQNPs were characterized by dynamic light scattering (DLS)/ζ-potential, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The photophysical properties were determined by UV-vis and fluorescence spectroscopy. The quantity of singlet oxygen generated in solution was measured using 1,3-diphenylisobenzofuran. The redox-responsive release of TCPP molecules was successfully demonstrated in solution in the presence of a reducing agent. The internalization of TCPP-PSilQNPs in cancer cells was investigated using laser scanning confocal microscopy. Phototoxicity experiments in vitro showed that the redox-responsive TCPP-PSilQNPs exhibited an improved phototherapeutic effect on cervical cancer cells compared to a non-responsive TCPP-PSilQNP control material.
在光动力疗法中,发展能够携带高负载光敏剂的刺激响应型光敏剂输送系统具有重要意义。本研究成功制备了以5,10,15,20-四(羧基苯基)卟啉(TCPP)硅烷衍生物为构建单元的反相微乳液法制备的氧化还原响应型聚倍半硅氧烷纳米粒子(PSilQNPs)。通过动态光散射(DLS)/ζ电位、扫描电子显微镜(SEM)和热重分析(TGA)对TCPP-PSilQNPs的结构性质进行了表征。通过紫外-可见光谱和荧光光谱测定其光物理性质。采用1,3-二苯基异苯并呋喃测定溶液中生成的一氧化氧的量。在还原剂存在下,溶液中TCPP分子的氧化还原响应释放被成功证明。利用激光扫描共聚焦显微镜研究了TCPP-PSilQNPs在癌细胞中的内化作用。体外光毒性实验表明,与非响应型TCPP-PSilQNP对照材料相比,氧化还原响应型TCPP-PSilQNPs对宫颈癌细胞具有更好的光治疗效果。