title: Vaccination efficacy with marrow mesenchymal stem cell against cancer was enhanced under simulated microgravity.
abstract: Stem cell vaccination can induce consistent and strong anti-tumor immunity against cancer in mice model. The antigenic similarity between tumors and embryos has been appreciated for many years and reflects the expression of embryonic gene products by cancer cells and/or cancer-initiating stem cells. Taking advantage of this similarity, we have tested a prophylactic lung cancer vaccine composed of allogeneic murine MSCs. Based on this conception, we first compared their tumor vaccines intervention effects of adult MSCs and MSCs under simulated microgravity (MSC/SMG). In this study, BALB/c mice were vaccinated with MSCs or MSC/SMG, compared with mice vaccinated with phosphate buffered saline (PBS) as negative controls. We then subcutaneously implanted the A549 human lung cancer cell line into vaccinated mice and monitored tumor growth potential in vivo. The smaller tumor size and less tumor weight were observed in mice vaccinated with MSCs or MSC/SMG, compared with that of the Control group. Particularly, it was much more significant in the group of MSC/SMG than that group of the MSCs. Vaccination with SMG treated MSCs inhibited proliferation and promoted apoptosis of tumor tissue. SMG/MSC vaccination induced bothTh1-mediated cytokine response; CD8-dependent cytotoxic response which reduced the proportion of Treg cells. Furthermore, SMG/MSC vaccination significantly increased MHC1 and HSPs proteins expression. In conclusion, we demonstrated the SMG could improve tumor-suppressive activity of MSC. The enhanced anti-tumor immune response of MSCs/SMG was strongly associated with the higher expression of MHC class I molecule on DCs, and the abundance of HSPs in the SMG treated MSCs may make antigens in the MSC more cross-presentable to the host DCs for generating protective antitumor activity. This study gains an insight into the mechanism of MSCs anti-tumor efficacy and gives a new strategy for cancer therapies in the future.
authors.affiliation: The TCM Department of Navy General Hospital, Fuchengmen Road No. 6, 100048, Beijing, China. Electronic address: jingli2017123@163.com.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: The Department of Acupuncture and Manipulation of Shaanxi University of Chinese Medicine, Shiji Road, 712046, Xi'an, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.affiliation: The TCM Department of Navy General Hospital, Fuchengmen Road No. 6, 100048, Beijing, China.
authors.forename: Xiuyu
authors.initials: X
authors.lastname: Li
authors.affiliation: The TCM Department of Navy General Hospital, Fuchengmen Road No. 6, 100048, Beijing, China.
authors.forename: Yanfang
authors.initials: Y
authors.lastname: Qian
mesh_terms: D000072283:A549 Cells; D000818:Animals; D017209:Apoptosis / Q000187:drug effects / Q000276:immunology; D015153:Blotting, Western; D019496:Cancer Vaccines / Q000008:administration & dosage / Q000276:immunology*; D049109:Cell Proliferation / Q000187:drug effects; D016207:Cytokines / Q000276:immunology / Q000378:metabolism; D058501:Enzyme-Linked Immunospot Assay; D015870:Gene Expression / Q000276:immunology; D006360:Heat-Shock Proteins / Q000276:immunology / Q000378:metabolism; D015395:Histocompatibility Antigens Class I / Q000276:immunology / Q000378:metabolism; D006801:Humans; D019394:Ki-67 Antigen / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D008175:Lung Neoplasms / Q000276:immunology* / Q000473:pathology / Q000628:therapy; D045164:Mesenchymal Stem Cell Transplantation / Q000379:methods*; D059630:Mesenchymal Stem Cells / Q000276:immunology*; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016896:Treatment Outcome; D047368:Tumor Burden / Q000187:drug effects / Q000276:immunology; D014611:Vaccination / Q000379:methods*; D014893:Weightlessness; D018474:Weightlessness Simulation / Q000379:methods; D023041:Xenograft Model Antitumor Assays / Q000379:methods
chemical_list: D019496:Cancer Vaccines; D016207:Cytokines; D006360:Heat-Shock Proteins; D015395:Histocompatibility Antigens Class I; D019394:Ki-67 Antigen
keywords: Anti-tumor immunity; CTL; MSCs; SMG; Vaccination