title: Recombinant nematode anticoagulant protein c2 inhibits cell invasion by decreasing uPA expression in NSCLC cells.
abstract: Nematode anticoagulant protein c2 (NAPc2) is an 85-residue polypeptide originally isolated from the hematophagous hookworm, Ancylostoma caninum. Several studies have shown that rNAPc2 inhibits the growth of primary and metastatic tumors in mice independently of its ability to initiate coagulation. We obtained bioactive recombinant rNAPc2 by splicing of the rNAPc2-intein-CBD fusion proteins expressed in E. coli ER2566. In the in vitro assay, rNAPc2 obviously inhibited the invasive ability of non-small cell lung cancer (NSCLC) cells in a dose-dependent manner. Furthermore, rNAPc2 suppressed tumor growth in vivo by daily intraperitoneal injection of rNAPc2 in an NSCLC cell xenograft model of nude mice. Respectively, rNAPc2 downregulated the production of urokinase plasminogen activator (uPA) (P<0.05) and suppressed nuclear factor-κB (NF-κB) activity. We also identified that inhibition of NF-κB activity impaired cell invasion and reduced the uPA production in NSCLC cells. Meanwhile, NF-κB was found to directly bind to the uPA promoter in vitro. These results demonstrated that rNAPc2 inhibits cell invasion at least in part through the downregulation of the NF-κB-dependent metastasis-related gene expression in NSCLC. Our results also suggest that uPA, a known metastasis-promoting gene, is indirectly regulated by rNAPc2 through NF-κB activation. These results indicate that rNAPc2 may be a potent agent for the prevention of NSCLC progression.
authors: Laboratory of Early Developmental Injuries, West China Institute of Woman and Children's Health, and Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China.
authors: Yu
authors: Y
authors: Tong
authors: Department of Gynecology and Obstetrics, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, Sichuan 610041, P.R. China.
authors: Jun
authors: J
authors: Yue
authors: Laboratory of Early Developmental Injuries, West China Institute of Woman and Children's Health, and Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China.
authors: Meng
authors: M
authors: Mao
authors: Laboratory of Early Developmental Injuries, West China Institute of Woman and Children's Health, and Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China.
authors: Qingqing
authors: Q
authors: Liu
authors: Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China.
authors: Jing
authors: J
authors: Zhou
authors: Center for Human Molecular Biology and Genetics, The Key Laboratory for Human Disease Gene Study of Sichuan Province, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, Sichuan 610041, P.R. China.
authors: Jiyun
authors: J
authors: Yang
mesh_terms: D000818:Animals; D002289:Carcinoma, Non-Small-Cell Lung / Q000378:metabolism / Q000473:pathology*; D004797:Enzyme-Linked Immunosorbent Assay; D004926:Escherichia coli / Q000235:genetics; D015801:Helminth Proteins / Q000302:isolation & purification / Q000502:physiology*; D008175:Lung Neoplasms / Q000378:metabolism / Q000473:pathology*; D051379:Mice; D008819:Mice, Nude; D016328:NF-kappa B / Q000378:metabolism; D009361:Neoplasm Invasiveness; D011994:Recombinant Proteins; D015854:Up-Regulation / Q000502:physiology; D014568:Urokinase-Type Plasminogen Activator / Q000378:metabolism*
chemical_list: D015801:Helminth Proteins; D016328:NF-kappa B; D011994:Recombinant Proteins; C400226:anti-coagulant protein C2, Ancylostoma caninum; D014568:Urokinase-Type Plasminogen Activator