Theranostics 2015; 5(11):1291-1302. doi:10.7150/thno.12691

Research Paper

CO2 bubbling-based 'Nanobomb' System for Targetedly Suppressing Panc-1 Pancreatic Tumor via Low Intensity Ultrasound-activated Inertial Cavitation

Kun Zhang1,2, Huixiong Xu2, Hangrong Chen1, ✉, Xiaoqing Jia1, Shuguang Zheng2, Xiaojun Cai1, Ronghui Wang3, Juan Mou1, Yuanyi Zheng3, ✉, Jianlin Shi1,✉

1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Ding-Xi Road, Shanghai 200050, P. R. China.
2. Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yan-chang-zhong Road, Shanghai, 200072, P. R. China.
3. Second Affiliated Hospital of Chongqing Medical University, 76 Linjiang Road, Yuzhong District, Chongqing 400010, P. R. China.

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Zhang K, Xu H, Chen H, Jia X, Zheng S, Cai X, Wang R, Mou J, Zheng Y, Shi J. CO2 bubbling-based 'Nanobomb' System for Targetedly Suppressing Panc-1 Pancreatic Tumor via Low Intensity Ultrasound-activated Inertial Cavitation. Theranostics 2015; 5(11):1291-1302. doi:10.7150/thno.12691. Available from

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Noninvasive and targeted physical treatment is still desirable especially for those cancerous patients. Herein, we develop a new physical treatment protocol by employing CO2 bubbling-based 'nanobomb' system consisting of low-intensity ultrasound (1.0 W/cm2) and a well-constructed pH/temperature dual-responsive CO2 release system. Depending on the temperature elevation caused by exogenous low-intensity therapeutic ultrasound irradiation and the low pH caused by the endogenous acidic-environment around/within tumor, dual-responsive CO2 release system can quickly release CO2 bubbles, and afterwards, the generated CO2 bubbles waves will timely explode before dissolution due to triggering by therapeutic ultrasound waves. Related bio-effects (e.g., cavitation, mechanical, shock waves, etc) caused by CO2 bubbles' explosion effectively induce instant necrosis of panc-1 cells and blood vessel destruction within panc-1 tumor, and consequently inhibit the growth of panc-1 solid tumor, simultaneously minimizing the side effects to normal organs. This new physiotherapy employing CO2 bubbling-based 'nanobomb' system promises significant potentials in targetedly suppressing tumors, especially for those highly deadly cancers.

Keywords: Nanobomb, inertial cavitation, low intensity ultrasound, panc-1 pancreatic cancer, dual-responsive CO2 release