Nanoscopic micelle delivery improves the photophysical properties and efficacy of photodynamic therapy of protoporphyrin IX.

Nanoscopic micelle delivery improves the photophysical properties and efficacy of photodynamic therapy of protoporphyrin IX.
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纳米胶束给药改善了原卟啉 IX 的光物理性质和光动力疗法的疗效。

DOI:
10.1016/j.jconrel.2011.01.004
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发表时间:
2011-05-10
期刊:
Journal of controlled release : official journal of the Controlled Release Society
影响因子:
--
通讯作者:
Gao J
Gao J
中科院分区:
其他
文献类型:
--
作者:
Ding H;Sumer BD;Kessinger CW;Dong Y;Huang G;Boothman DA;Gao J

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纳米递送系统在提高光动力治疗(PDT)应用中疏水光敏剂的溶解度和递送效率方面显示出相当大的前景。在这项研究中,我们报道了采用非共价包封和共价偶联方法制备和表征含有强效光敏剂原卟啉IX (PpIX)的聚合物胶束。根据掺入方式和PpIX的负载百分比,PpIX在胶束核心中以单体、二聚体或聚集体的形式存在。PpIX状态直接影响水溶液中胶束的荧光强度和生成1O2的效率。在溶液中,PpIX负载密度较低(如0.2%)的胶束比PpIX负载密度较高(如4%)的胶束荧光更亮,10o2产率更高。然而,PDT对H2009肺癌细胞的疗效呈现相反的趋势。特别是,4% ppix共轭胶束表现出最大的PDT治疗窗口,这表明了最高的光毒性和相对较低的暗毒性。本研究的结果有助于基本理解胶束递送PpIX的纳米结构-性能关系,并建立可行的胶束配方(即4% PpIX共轭胶束),用于体内抗肿瘤疗效评估。
Nanodelivery systems have shown considerable promise in increasing the solubility and delivery efficiency of hydrophobic photosensitizers for photodynamic therapy (PDT) applications. In this study, we report the preparation and characterization of polymeric micelles that incorporate protoporphyrin IX (PpIX), a potent photosensitizer, using non-covalent encapsulation and covalent conjugation methods. Depending on the incorporation method and PpIX loading percentage, PpIX existed as a monomer, dimer or aggregate in the micelle core. The PpIX state directly affected the fluorescence intensity and 1O2 generation efficiency of the resulting micelles in aqueous solution. Micelles with lower PpIX loading density (e.g. 0.2%) showed brighter fluorescence and higher 1O2 yield than those with higher PpIX loading density (e.g. 4%) in solution. However, PDT efficacy in H2009 lung cancer cells showed an opposite trend. In particular, 4% PpIX-conjugated micelles demonstrated the largest PDT therapeutic window, as indicated by the highest phototoxicity and relatively low dark toxicity. Results from this study contribute to the fundamental understanding of nanoscopic structure-property relationships of micelle-delivered PpIX and establish a viable micelle formulation (i.e. 4% PpIX-conjugated micelles) for in vivo evaluation of antitumor efficacy.
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