Promoting Intratumoral Drug Accumulation by Bio-Membrane Regulated Active Targeting for Tumor Photothermal Therapy

Chenkai Yang,1,* Xiangqian Cao,1,* Lei He,2,3,* Cong Wu,2,* Mengxin Zhao,2 Fei Duan,2 Zhiwen Qiu,2 Xiaodong Zhu,2 Yilin Yan,1 Shengzhou Li,1 Wei Li,2 Bing Shen1 1Department of Urology, Shanghai General Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, People’s Republic of China; 2Department of Nanomedicine & Shanghai Key Laboratory of Cell Engineering, Naval Medical University, Shanghai, People’s Republic of China; 3School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, People’s Republic of China*These authors contributed equally to this workCorrespondence: Wei Li, Department of Nanomedicine & Shanghai Key Laboratory of Cell Engineering, Naval Medical University, 800 Xiangyin Road, Yangpu District, Shanghai, 200433, People’s Republic of China, Tel +86 21 81871644, Fax +86 21 81870801, Email liwei_dds@163.com Bing Shen, Department of Urology, Shanghai General Hospital, Shanghai Jiaotong University School of Medicine, 85 Wujin Road, Hongkou District, Shanghai, 200080, People’s Republic of China, Tel/Fax +86 18017181979, Email urodrshenbing@shsmu.edu.cnIntroduction: Insufficient tumor permeability and inadequate nanoparticle retention continue to be significant limitations in the efficacy of anti-tumor drug therapy. Numerous studies have focused on enhancing tumor perfusion by improvement of tumor-induced endothelial leakage, often known as the enhanced permeability and retention (EPR) effect. However, these approaches have produced suboptimal therapeutic outcomes and have been associated with significant side effects. Therefore, in this study, we prepared tumor cell membrane-coated gold nanorods (GNR@TM) to enhance drug delivery in tumors through homogeneous targeting of tumor cell membranes and in situ real-time photo-controlled therapy.Methods: Here, we fabricated GNR@TM, and characterized it using various techniques including Ultraviolet-Visible (UV-Vis) spectrophotometer, particle size analysis, potential measurement, and transmission electron microscopy (TEM). The cellular uptake and cytotoxicity of GNR@TM were analyzed by flow cytometry, confocal laser scanning microscopy (CLSM), TEM, CCK8 assay and live/dead staining. Tissue drug distribution was determined by inductively coupled plasma mass spectrometry (ICP-MS) and immunofluorescence staining. Furthermore, to evaluate the therapeutic effect, mice bearing MB49 tumors were intravenously administered with GNR@TM. Subsequently, near-infrared (NIR) laser therapy was performed, and the mice’s tumor growth and body weight were monitored.Results: The tumor cell membrane coating endowed GNR@TM with extended circulation time in vivo and homotypic targeting to tumor, thereby enhancing the accumulation of GNR@TM within tumors. Upon 780 nm laser, GNR@TM exhibited excellent photothermal conversion capability, leading to increased tumor vascular leakage. This magnification of the EPR effect induced by NIR laser further increased the accumulation of GNR@TM at the tumor site, demonstrating strong antitumor effects in vivo.Conclusion: In this study, we successfully developed a NIR-triggered nanomedicine that increased drug accumulation in tumor through photo-controlled therapy and homotypic targeting of the tumor cell membrane. GNR@TM has been demonstrated effective suppression of tumor growth, excellent biocompatibility, and significant potential for clinical applications. Keywords: intratumor drug accumulation, photo-controlled therapy, homotypic targeting, tumor cell membrane, gold nanorods