title: Norepinephrine-induced myeloid-derived suppressor cells block T-cell responses via generation of reactive oxygen species.
abstract: Increased numbers of myeloid-derived suppressor cells (MDSCs) are often observed in various pathological and physiological conditions. However, the interactions between neurotransmitters and MDSCs have not been elucidated. In this study, we studied whether norepinephrine (NE), a neurotransmitter, could affect the differentiation of human MDSCs in vitro. Flow cytometric analysis showed that treatment with 20 μM NE significantly enhanced the expansion of MDSCs. The NE-generated MDSCs suppressed the T-cells proliferation, depending on the production of reactive oxygen species (ROS). Moreover, the expansion of MDSCs induced by NE resulted in a dramatic induction of nicotinamide adenine dinucleotide phosphate oxidase subunit P47(phox). Addition of the ROS inhibitor catalase into the MDSCs/T-cell co-culture system partly abrogated the suppressive effects of MDSCs on T-cell proliferation. In summary, our data have shown that NE enhanced the expansion of human MDSCs in vitro, providing important insights into the novel roles of neurotransmitters in the regulation of myeloid cell differentiation and function.
authors.affiliation: Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-Sen University , Guangzhou , China .
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Liu
authors.forename: Jianyang
authors.initials: J
authors.lastname: Wei
authors.forename: Guanghui
authors.initials: G
authors.lastname: Guo
authors.forename: Jie
authors.initials: J
authors.lastname: Zhou
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects* / Q000276:immunology; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D005434:Flow Cytometry; D006801:Humans; D022423:Myeloid Cells / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D023461:Myeloid Progenitor Cells / Q000187:drug effects / Q000276:immunology / Q000378:metabolism; D018377:Neurotransmitter Agents / Q000494:pharmacology*; D009569:Nitric Oxide / Q000096:biosynthesis; D009638:Norepinephrine / Q000494:pharmacology*; D017382:Reactive Oxygen Species / Q000378:metabolism*; D013601:T-Lymphocytes / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism
chemical_list: D018377:Neurotransmitter Agents; D017382:Reactive Oxygen Species; D009569:Nitric Oxide; D009638:Norepinephrine
keywords: Immunosuppression function; myeloid-derived suppressor cells; norepinephrine