Fangfang Shi1, Miao Li2, Songyan Wu2, Fang Yang3, Wu Di2, Meng Pan2, Fengshu Zhao2, Shouhua Luo3, Ning Gu3, Jun Dou4. 1. Department of Pathogenic Biology and Immunology, School of Medicine, Southeast University, Nanjing 210009, China; Department of Oncology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing 210009, China. 2. Department of Pathogenic Biology and Immunology, School of Medicine, Southeast University, Nanjing 210009, China. 3. School of Biological Science and Technology, Southeast University, Nanjing 210096, China. 4. Department of Pathogenic Biology and Immunology, School of Medicine, Southeast University, Nanjing 210009, China. Electronic address: njdoujun@seu.edu.cn.
Abstract
BACKGROUND: Although multiple myeloma (MM) treatment has improved in the last decade, it remains largely incurable. One of main reasons is that there are cancer stem cells (CSCs) in MM, which are responsible for MM's drug resistance and relapse. In this study, we used the targeting microbubbles (MBs) conjugated with anti-ABCG2 monoclonal antibody (mAb) for ultrasound mediated epirubicin (EPI) delivery to evaluate the therapeutic effectiveness of the novel agent in MM CSC xenograft model. METHODS: MM CSCs, marked by CD138-CD34- cell phenotypes were isolated from human MM RPMI8226 cell line using immune magnetic activated cell sorting system, and inoculated into nonobese diabetic/severe combined immunodeficient mice by subcutaneous or intravenous injection. After the mice developed MM, they were intravenous injection treated with EPI, EPI-MBs+mAb, and EPI-MBs+mAb with ultrasound exposure, respectively. RESULTS: All treated mice showed inhibited tumor sizes or bone lesions, decreased renal damages and anemia, and increased MM bearing mice' survival. In particular, the EPI-MBs+mAb plus ultrasound exhibited significantly enhanced therapeutic MM effectiveness by inducing apoptosis compared with other biologic agents. CONCLUSION: The data provide evidence that EPI-MBs+mAb with ultrasound exposure might be available for treatment MM patients in clinic.
BACKGROUND: Although multiple myeloma (MM) treatment has improved in the last decade, it remains largely incurable. One of main reasons is that there are cancer stem cells (CSCs) in MM, which are responsible for MM's drug resistance and relapse. In this study, we used the targeting microbubbles (MBs) conjugated with anti-ABCG2 monoclonal antibody (mAb) for ultrasound mediated epirubicin (EPI) delivery to evaluate the therapeutic effectiveness of the novel agent in MM CSC xenograft model. METHODS: MM CSCs, marked by CD138-CD34- cell phenotypes were isolated from human MM RPMI8226 cell line using immune magnetic activated cell sorting system, and inoculated into nonobese diabetic/severe combined immunodeficientmice by subcutaneous or intravenous injection. After the mice developed MM, they were intravenous injection treated with EPI, EPI-MBs+mAb, and EPI-MBs+mAb with ultrasound exposure, respectively. RESULTS: All treated mice showed inhibited tumor sizes or bone lesions, decreased renal damages and anemia, and increased MM bearing mice' survival. In particular, the EPI-MBs+mAb plus ultrasound exhibited significantly enhanced therapeutic MM effectiveness by inducing apoptosis compared with other biologic agents. CONCLUSION: The data provide evidence that EPI-MBs+mAb with ultrasound exposure might be available for treatment MM patients in clinic.