title: Inhibitory effect of live-attenuated Listeria monocytogenes-based vaccines expressing MIA gene on malignant melanoma.
abstract: Listeria monocytogenes (LM), a Gram-positive facultative intracellular bacterium, can be used as an effective exogenous antigen expression vector in tumor-target therapy. But for successful clinical application, it is necessary to construct attenuated LM stain that is safe yet retains the potency of LM based on the full virulent pathogen. In this study, attenuated LM and recombinants of LM expressing melanoma inhibitory activity (MIA) were constructed successfully. The median lethal dose (LD(50)) and invasion efficiency of attenuated LM strains were detected. The recombinants were utilized for immunotherapy of animal model of B16F10 melanoma. The level of MIA mRNA expression in tumor tissue was detected by using real-time polymerase chain reaction (PCR) with specific sequence, meanwhile the anti-tumor immune response was assayed by flow cytometric analysis and enzyme-linked immunosorbent spot (ELISPOT) assay. The results showed the toxicity and invasiveness of attenuated LM were decreased as compared with LM, and attenuated LM expressing MIA, especially the double-genes attenuated LM recombinant, could significantly induce anti-tumor immune response and inhibit tumor growth. This study implicates attenuated LM may be a safer and more effective vector for immunotherapy of melanoma.
authors.affiliation: Department of Dermatology, Huazhong University of Science and Technology, Wuhan, 430022, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Qian
authors.affiliation: Department of Dermatology, Huazhong University of Science and Technology, Wuhan, 430022, China.
authors.forename: Na
authors.initials: N
authors.lastname: Zhang
authors.affiliation: Department of Dermatology, Huazhong University of Science and Technology, Wuhan, 430022, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Jiang
authors.affiliation: Department of Dermatology, Huazhong University of Science and Technology, Wuhan, 430022, China.
authors.forename: Siyuan
authors.initials: S
authors.lastname: Chen
authors.affiliation: Department of Anesthesiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
authors.forename: Shujuan
authors.initials: S
authors.lastname: Chu
authors.affiliation: Department of Dermatology, Huazhong University of Science and Technology, Wuhan, 430022, China.
authors.forename: Firas
authors.initials: F
authors.lastname: Hamze
authors.affiliation: Department of Dermatology, Huazhong University of Science and Technology, Wuhan, 430022, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wu
authors.affiliation: College of Life Science, Huazhong Normal University, Wuhan, 430079, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Luo
authors.affiliation: Department of Dermatology, Huazhong University of Science and Technology, Wuhan, 430022, China. fengap195@yahoo.cn.
authors.forename: Aiping
authors.initials: A
authors.lastname: Feng
mesh_terms: D000818:Animals; D019496:Cancer Vaccines / Q000235:genetics / Q000276:immunology; D016326:Extracellular Matrix Proteins / Q000235:genetics* / Q000276:immunology; D008089:Listeria monocytogenes / Q000276:immunology*; D008297:Male; D008545:Melanoma / Q000235:genetics / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D014613:Vaccines, Attenuated / Q000235:genetics / Q000276:immunology*
chemical_list: D019496:Cancer Vaccines; D016326:Extracellular Matrix Proteins; C513263:Mia protein, mouse; D014613:Vaccines, Attenuated