Intermolecular Structural Change for Thermoswitchable Polymeric Photosensitizer.

Intermolecular Structural Change for Thermoswitchable Polymeric Photosensitizer.
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DOI:
10.1021/jacs.6b04875
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发表时间:
2016-08-31
影响因子:
15
通讯作者:
Kim DH
Kim DH
中科院分区:
化学1区
文献类型:
--
作者:
Park W;Park SJ;Cho S;Shin H;Jung YS;Lee B;Na K;Kim DH

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我们通过将PS(Pheophorbide-a,PPb-a)偶联到生物相容性羟丙基纤维素的温度响应性聚合物骨架上,开发了一种可热转换的聚合物光敏剂(T-PPS)。T-PPS中自猝灭的PS分子通过π-π堆积紧密相连,在温度诱导的聚合物主链相变作用下,很容易转变为活性单体状态。用同步辐射小角X射线散射和紫外可见分光光度计分析了T-PPS中PS分子间相互作用随温度的变化。T-PPS允许在高热温度(45 °C)下可切换的激活和协同增强的癌细胞杀伤效果。我们开发的T-PPS具有相当大的潜力,不仅作为一类新的光医学在临床上,而且作为一种基于温度响应的生物传感器。
We developed a thermoswitchable polymeric photosensitizer (T-PPS) by conjugating PS (Pheophorbide-a, PPb-a) to a temperature-responsive polymer backbone of biocompatible hydroxypropyl cellulose. Self-quenched PS molecules linked in close proximity by π–π stacking in T-PPS were easily transited to an active monomeric state by the temperature-induced phase transition of polymer backbones. The temperature-responsive intermolecular interaction changes of PS molecules in T-PPS were demonstrated in synchrotron small-angle X-ray scattering and UV–vis spectrophotometer analysis. The T-PPS allowed switchable activation and synergistically enhanced cancer cell killing effect at the hyperthermia temperature (45 °C). Our developed T-PPS has the considerable potential not only as a new class of photomedicine in clinics but also as a biosensor based on temperature responsiveness.
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