Tang Xiaojun, Zhou Yan, Li Wenjie, Tang Qi, Chen Renjie, Zhu Jin, Feng Zhenqing
Department of Pathology, Nanjing Medical University, Nanjing, Jiangsu 210029, China. ; The Key Laboratory of Antibody Technique of Ministry of Health, Nanjing Medical University, Nanjing, Jiangsu 210029, China.
Department of Oncology, Ao Yang Hospital, Zhangjiagang, Jiangsu 215617, China.
J Biomed Res. 2014 Nov;28(6):468-75. doi: 10.7555/JBR.28.20140066. Epub 2014 Dec 1.
T cells modified with chimeric antigen receptor are an attractive strategy to treat Epstein-Barr virus (EBV) associated malignancies. The EBV latent membrane protein 1 (LMP1) is a 66-KD integral membrane protein encoded by EBV that consists of transmembrane-spanning loops. Previously, we have identified a functional signal chain variable fragment (scFv) that specifically recognizes LMP1 through phage library screening. Here, we constructed a LMP1 specific chimeric antigen receptor containing anti-LMP1 scFv, the CD28 signalling domain, and the CD3ζ chain (HELA/CAR). We tested its functional ability to target LMP1 positive nasopharyngeal carcinoma cells. HELA/CAR cells were efficiently generated using lentivirus vector encoding the LMP1-specific chimeric antigen receptor to infect activated human CD3+ T cells. The HELA/CAR T cells displayed LMP1 specific cytolytic action and produced IFN-γ and IL-2 in response to nasopharyngeal carcinoma cells overexpressing LMP1. To demonstrate in vivo anti-tumor activity, we tested the HELA/CAR T cells in a xenograft model using an LMP1 overexpressing tumor. Intratumoral injection of anti-LMP1 HELA/CAR-T cells significantly reduced tumor growth in vivo. These results show that targeting LMP1 using HELA/CAR cells could represent an alternative therapeutic approach for patients with EBV-positive cancers.
经嵌合抗原受体修饰的T细胞是治疗与爱泼斯坦-巴尔病毒(EBV)相关恶性肿瘤的一种有吸引力的策略。EBV潜伏膜蛋白1(LMP1)是一种由EBV编码的66-kD整合膜蛋白,由跨膜环组成。此前,我们通过噬菌体文库筛选鉴定出一种能特异性识别LMP1的功能性信号链可变片段(scFv)。在此,我们构建了一种包含抗LMP1 scFv、CD28信号结构域和CD3ζ链的LMP1特异性嵌合抗原受体(HELA/CAR)。我们测试了其靶向LMP1阳性鼻咽癌细胞的功能能力。使用编码LMP1特异性嵌合抗原受体的慢病毒载体感染活化的人CD3+ T细胞,高效产生了HELA/CAR细胞。HELA/CAR T细胞表现出LMP1特异性细胞溶解作用,并在接触过表达LMP1的鼻咽癌细胞时产生IFN-γ和IL-2。为了证明体内抗肿瘤活性,我们在使用过表达LMP1的肿瘤的异种移植模型中测试了HELA/CAR T细胞。瘤内注射抗LMP1 HELA/CAR-T细胞显著降低了体内肿瘤生长。这些结果表明,使用HELA/CAR细胞靶向LMP1可能为EBV阳性癌症患者提供一种替代治疗方法。