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Expansion of human NK-22 cells with IL-7, IL-2, and IL-1beta reveals intrinsic functional plasticity.

ABSTRACT: Natural killer-22 (NK-22) cells are a human NK cell subset situated in mucosal-associated lymphoid tissues that specialize in IL-22 secretion in response to IL-23. Here we investigated the cytokine requirements for NK-22 cell expansion. IL-7 maintained the survival of NK-22 cells and IL-22 production in response to IL-23 but was insufficient to induce robust expansion. Proliferation of NK-22 cells was increased markedly by adding either IL-1beta or IL-2 to IL-7 and was even stronger in the presence of IL-1beta plus IL-2. In contrast to IL-7, continuous culture in IL-1beta and IL-2 modified NK-22 cytokine profiles. IL-1beta promoted constitutive IL-22 secretion rather than acute IL-22 production in response to IL-23 and induced IL-17 in some cells. IL-2 reduced secretion of IL-22 and IL-17, increasing production of IFN-gamma and leukemia inhibitory factor. Functional deviation toward IFN-gamma production also was induced by continuous culture in IL-23. These results demonstrate the functional plasticity of NK-22 cells, which may allow flexible responses to different pathogens. Finally, we found that NK-22 cells released the B-cell survival factor, B-cell activating factor belonging to the TNF family (BAFF), suggesting a potential role of NK-22 cells in promoting B-cell-mediated mucosal immunity.

SUBMITTER: Cella M

PROVIDER: S-EPMC2890739 | biostudies-literature | 2010 Jun

REPOSITORIES: biostudies-literature

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Expansion of human NK-22 cells with IL-7, IL-2, and IL-1beta reveals intrinsic functional plasticity.

Cella Marina M Otero Karel K Colonna Marco M

Proceedings of the National Academy of Sciences of the United States of America 20100601 24

Natural killer-22 (NK-22) cells are a human NK cell subset situated in mucosal-associated lymphoid tissues that specialize in IL-22 secretion in response to IL-23. Here we investigated the cytokine requirements for NK-22 cell expansion. IL-7 maintained the survival of NK-22 cells and IL-22 production in response to IL-23 but was insufficient to induce robust expansion. Proliferation of NK-22 cells was increased markedly by adding either IL-1beta or IL-2 to IL-7 and was even stronger in the prese ...[more]

PMID: 20534450

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Project description:Background: Natural Killer (NK) cell-based immunotherapy used to treat cancer requires the adoptive transfer of a large number of activated NK cells. Here, we report a new effective method to expand human NK cells ex vivo using K562 cells genetically engineered (GE) to express OX40 ligand (K562-OX40L) in combination with a short exposure to soluble IL-21. In addition, we describe a possible mechanism of the NK cell expansion through the OX40 receptor-OX40 ligand axis which is dependent on NK cell homotypic interaction. Methods: K562-OX40L cells were generated by lentiviral transduction and were used as feeder cells to expand and activate NK cells from PBMCs in the presence of IL-2/IL-15. Soluble IL-21 was also added in various concentrations only once at the beginning of the culture. NK cells were expanded for 4-5 weeks, and the purity, expansion rate, phenotype and function (cytotoxicity, antibody-dependent cell-mediated cytotoxicity (ADCC), cytokine production, CD107a degranulation) of these expanded NK cells were compared to those generated by using K562 feeder cells. Results: The culture of NK cells with K562-OX40L cells in combination with the transient exposure to IL-21 highly enhanced NK cell expansion to approximately 2,000-fold after 4 weeks of culture, compared to a 303-fold expansion using the conventional K562 cells. Mechanistically, the OX40-OX40L axis between the feeder cells and NK cells as well as the homotypic interaction between NK cells through the OX40-OX40L axis were both necessary for NK cell expansion. The short exposure of NK cells to IL-21 had a synergistic effect with OX40 signaling for NK cell expansion. Apart from their enhanced expansion, NK cells grown with K562-OX40L feeder cells were similar to those grown with conventional K562 cells in regard to the surface expression of various receptors, cytotoxicity, ADCC, cytokine secretion, and CD107 degranulation. Conclusion: Our data suggest that OX40 ligand is a potent co-stimulant for the robust expansion of human NK cells and the homotypic NK cell interactions through the OX40-OX40L axis is a mechanism of NK cell expansion.

Dataset Information

Expansion of human NK-22 cells with IL-7, IL-2, and IL-1beta reveals intrinsic functional plasticity.

Publications

Expansion of human NK-22 cells with IL-7, IL-2, and IL-1beta reveals intrinsic functional plasticity.

Similar Datasets

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