title: A novel anti-DR5 chimeric antibody and epirubicin synergistically suppress tumor growth.
abstract: Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) induces apoptosis in a variety of tumor cells. TRAIL receptor 2 (DR5) expression is high in tumor cells, transformed cells, and clinical tumor specimens and is low in most normal cells and tissues; therefore, DR5 is considered an attractive target for cancer therapy. In this study, HMCAZ5, a novel mouse-human chimeric antibody based on AD5-10, was generated and stably expressed in CHO-dhfr(-) cells. Highly purified HMCAZ5 exhibits a high affinity for the receptor that is equal to the parental mouse antibody, induces apoptosis in various cancer cells but not in normal hepatocytes, and elicits both antibody-dependent cellular cytotoxicity and complement-dependent cytotoxicity in various human cancer cells. The anthracycline anticancer drug epirubicin (EPB) synergizes the cytotoxicity of HMCAZ5 in cancer cells by upregulating DR5 expression on the cell surfaces, enhancing p53 expression, Bid cleavage, and JNK phosphorylation and downregulating c-FLIP expression and Akt phosphorylation. Moreover, HMCAZ5 alone suppresses tumor growth, and EPB augments the tumoricidal activity in human colorectal and hepatocellular tumor xenografts in athymic nude mice. These data suggest that the anti-DR5 chimeric antibody HMCAZ5 may have a clinical use and represents a useful immunological strategy, in combination with chemotherapy, for the treatment of cancer.
authors: National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, People's Republic of China.
authors: Yuhe
authors: Y
authors: Qiu
authors: Zhixin
authors: Z
authors: Zhang
authors: Juan
authors: J
authors: Shi
authors: Shilian
authors: S
authors: Liu
authors: Yanxin
authors: Y
authors: Liu
authors: Dexian
authors: D
authors: Zheng
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000494:pharmacology* / Q000633:toxicity; D000915:Antibody Affinity; D000970:Antineoplastic Agents / Q000276:immunology / Q000494:pharmacology* / Q000633:toxicity; D017209:Apoptosis / Q000187:drug effects; D016466:CHO Cells; D045744:Cell Line, Tumor; D006224:Cricetinae; D004357:Drug Synergism; D015251:Epirubicin / Q000494:pharmacology*; D005260:Female; D006801:Humans; D007668:Kidney / Q000187:drug effects; D008099:Liver / Q000187:drug effects; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009374:Neoplasms, Experimental / Q000188:drug therapy* / Q000473:pathology; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D047368:Tumor Burden / Q000187:drug effects; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism; D015854:Up-Regulation / Q000187:drug effects; D023041:Xenograft Model Antitumor Assays
chemical_list: D000911:Antibodies, Monoclonal; D000970:Antineoplastic Agents; C576903:HMCAZ5; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53; D015251:Epirubicin