title: Human cancer cells with stem cell-like phenotype exhibit enhanced sensitivity to the cytotoxicity of IL-2 and IL-15 activated natural killer cells.
abstract: Tumors harbor a population of cancer stem cells (CSCs) which can drive tumor progression and therapeutical resistance. Nature killer (NK) cells are best known for their ability to directly recognize and kill malignant cells. However, the susceptibility of cancer stem cells to NK cells is not fully understood. Here we demonstrated that human CD44+CD24- breast CSCs were shown enhanced sensitivity to IL-2 and IL-15 activated NK cells. CD44+CD24- CSCs expressed higher levels of NKG2D ligands ULBP1, ULBP2 and MICA. Blockade assay showed that the sensitivity of CSCs to NK cells-mediated lysis was mainly dependent on NKG2D. Furthermore, redox oxygen species (ROS)-low tumor cells were more sensitive to NK cells. The presence of antioxidant enzymes inhibitor L-S,R-buthionine sulfoximine or H2O2 retarded the cytotoxicity of NK cells to CD44+CD24- CSCs. In addition, NK cells could readily target CD133+ colonal CSCs. Our findings provide novel targets for NK cells-based immunotherapy and are of great importance for translational medicine.
authors.affiliation: State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu 610041, PR China. Electronic address: yintao03073@163.com.
authors.forename: Tao
authors.initials: T
authors.lastname: Yin
authors.affiliation: State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu 610041, PR China.
authors.forename: Guoping
authors.initials: G
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu 610041, PR China.
authors.forename: Sisi
authors.initials: S
authors.lastname: He
authors.affiliation: State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu 610041, PR China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu 610041, PR China.
authors.forename: Jianhong
authors.initials: J
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu 610041, PR China. Electronic address: wangys75@gmail.com.
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Wang
mesh_terms: D001943:Breast Neoplasms / Q000276:immunology*; D045744:Cell Line, Tumor; D002469:Cell Separation; D003602:Cytotoxicity, Immunologic / Q000276:immunology*; D005434:Flow Cytometry; D006801:Humans; D019409:Interleukin-15 / Q000276:immunology; D007376:Interleukin-2 / Q000276:immunology; D007694:Killer Cells, Natural / Q000276:immunology*; D008213:Lymphocyte Activation / Q000276:immunology; D014411:Neoplastic Stem Cells / Q000276:immunology*; D010641:Phenotype; D017382:Reactive Oxygen Species / Q000276:immunology
chemical_list: C569274:IL15 protein, human; C508594:IL2 protein, human; D019409:Interleukin-15; D007376:Interleukin-2; D017382:Reactive Oxygen Species
keywords: Cancer stem cells; NK cells; NKG2D; ROS