Ma Yan, Zhou Junhong, Miao Zhaohua, Qian Haisheng, Zha Zhengbao
School of Food and Biological Engineering, Hefei University of Technology, Hefei, Anhui 230009, P. R. China.
ACS Appl Bio Mater. 2019 Feb 18;2(2):848-855. doi: 10.1021/acsabm.8b00687. Epub 2019 Feb 1.
Cancer cells with up-regulated intracellular heat shock proteins (HSPs) expression under adverse heat environment during photothermal therapy (PTT) always resulted in inefficient oncotherapy. As the expression of HSPs is an energy-dependent manner, inhibiting the aerobic glycolysis pathway to realize tumor starvation and therefore consequently reducing the production of intratumoral adenosine 5'-triphosphate (ATP) would offer an efficient way for sensitizing cancer cells to PTT. DLM@PPy NPs, a polypyrrole (PPy)-based platform complexing with dl-menthol (DLM), was well-designed and successfully developed here as a near-infrared (NIR) light and thermo responsive drug delivery system. Benefiting from the volatile property of DLM and high photothermal conversion ability of PPy, the as-prepared DLM@PPy NPs could continuously generate bubbles under NIR light illumination, which is good for precisely controlling the release of encapsulated drug and monitoring the whole therapeutic process by ultrasound imaging. By encapsulating diclofenac (DC, an inhibitor of glucose transporter 1 to realizing tumor starvation) to form DC/DLM@PPy NPs, on-demand DC release could be easily achieved by selectively turning on/off the NIR light irradiation. After releasing DC in tumor lesion to reduce the generation of intratumoral ATP, a significant intensified cell-killing efficiency of PTT was observed. Thus, our study has demonstrated the good potential of DLM/PPy NPs as a stimuli-responsive DC delivery system for intensified PTT through inhibiting the aerobic glycolysis of cancer cells.
在光热疗法(PTT)期间,处于不利热环境下的癌细胞若细胞内热休克蛋白(HSPs)表达上调,往往会导致肿瘤治疗效率低下。由于HSPs的表达是以能量依赖方式进行的,抑制有氧糖酵解途径以实现肿瘤饥饿从而减少肿瘤内三磷酸腺苷(ATP)的产生,将为使癌细胞对PTT敏感提供一种有效方法。DLM@PPy纳米粒子是一种基于聚吡咯(PPy)并与dl-薄荷醇(DLM)络合的平台,在此被精心设计并成功开发为一种近红外(NIR)光和热响应药物递送系统。得益于DLM的挥发性和PPy的高光热转换能力,所制备的DLM@PPy纳米粒子在近红外光照射下能够持续产生气泡,这有利于精确控制包封药物的释放,并通过超声成像监测整个治疗过程。通过包封双氯芬酸(DC,一种葡萄糖转运蛋白1抑制剂以实现肿瘤饥饿)形成DC/DLM@PPy纳米粒子,通过选择性地开启/关闭近红外光照射可轻松实现按需释放DC。在肿瘤病灶中释放DC以减少肿瘤内ATP的产生后,观察到PTT的细胞杀伤效率显著增强。因此,我们的研究证明了DLM/PPy纳米粒子作为一种刺激响应性DC递送系统,通过抑制癌细胞的有氧糖酵解来增强PTT具有良好潜力。
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