通过EphA2介导的纳米载体对转移性乳腺癌和肿瘤新生血管进行双重靶向
Dual targeting for metastatic breast cancer and tumor neovasculature by EphA2-mediated nanocarriers.
作者信息
Guo Zhaoming, He Bing, Yuan Lan, Dai Wenbing, Zhang Hua, Wang Xueqing, Wang Jiancheng, Zhang Xuan, Zhang Qiang
机构信息
State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China; School of Life Science and Medicine, Dalian University of Technology, Panjin, Liaoning 124221, China.
State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China.
出版信息
Int J Pharm. 2015 Sep 30;493(1-2):380-9. doi: 10.1016/j.ijpharm.2015.05.051. Epub 2015 May 21.
EphA2 is a transmembrane receptor tyrosine kinase that is highly expressed on both tumor neovasculature and some kinds of tumor cells. Here, a homing peptide with a sequence of YSAYPDSVPMMSK (YSA) that binds specifically with EphA2 was utilized to modify the stealth liposomes (YSA-LP). With a particle size of about 85 nm, this functionalized nanocarrier was loaded with fluorescent probe or doxorubicin (DOX) and investigated in vitro and in vivo. In the cellular endocytosis studies in vitro, coumarin-6 loaded YSA-LP exhibited significant specificity to both EphA2-overexpressing tumor cells (MDA-MB-231) and human umbilical vein endothelial cells (HUVEC) via a YSA mediated interaction. In a MDA-MB-231 xenograft tumor mouse model, DiR-loaded YSA-LP showed more lasting accumulation in tumor tissue by small animal imaging compared to unmodified liposomes (LP). Further, YSA-LP greatly facilitated the efficacy of DOX loaded against both tumor cells and tumor angiogenesis in the same mouse model, evidenced by inhibiting tumor growth, metastasis and CD31 expression as well as inducing cancer cell apoptosis. Additionally, YSA-LP (DOX) showed relatively low systemic and cardiac toxicity compared with control groups. In conclusion, YSA might be a promising targeting motif for EphA2-overexpressing tumor cells and tumor neovasculature, which could be used to mediate drug delivery for chemotherapy agents.
EphA2是一种跨膜受体酪氨酸激酶,在肿瘤新生血管和某些类型的肿瘤细胞上均高表达。在此,利用一种序列为YSAYPDSVPMMSK(YSA)的归巢肽与EphA2特异性结合,对隐形脂质体(YSA-LP)进行修饰。这种功能化纳米载体的粒径约为85 nm,负载荧光探针或阿霉素(DOX),并进行了体外和体内研究。在体外细胞内吞研究中,负载香豆素-6的YSA-LP通过YSA介导的相互作用,对EphA2过表达的肿瘤细胞(MDA-MB-231)和人脐静脉内皮细胞(HUVEC)均表现出显著的特异性。在MDA-MB-231异种移植瘤小鼠模型中,与未修饰的脂质体(LP)相比,负载DiR的YSA-LP通过小动物成像显示在肿瘤组织中的蓄积更持久。此外,在同一小鼠模型中,YSA-LP极大地促进了负载DOX对肿瘤细胞和肿瘤血管生成的疗效,表现为抑制肿瘤生长、转移和CD31表达以及诱导癌细胞凋亡。此外,与对照组相比,YSA-LP(DOX)表现出相对较低的全身毒性和心脏毒性。总之,YSA可能是针对EphA2过表达肿瘤细胞和肿瘤新生血管的一种有前景的靶向基序,可用于介导化疗药物的递送。