Abstract
Immune dysfunction in astronauts is well documented after spaceflights. Microgravity is one of the key factors directly suppressing the function of immune system. However, it is unclear which subpopulations of immune cells including innate and adaptive immune cells are more sensitive to microgravity We herein investigated the direct effects of modeled microgravity (MMg) on different immune cells in vitro. Mouse splenocytes, thymocytes and bone marrow cells were exposed to MMg for 16 hrs. The survival and the phenotypes of different subsets of immune cells including CD4+T cells, CD8+T cells, CD4+Foxp3+ regulatory T cells (Treg), B cells, monocytes/macrophages, dendritic cells (DCs), natural killer cells (NK) were determined by flow cytometry. After splenocytes were cultured under MMg for 16h, the cell frequency and total numbers of monocytes, macrophages and CD4+Foxp3+T cells were significantly decreased more than 70 %. MMg significantly decreased the cell numbers of CD8+ T cells, B cells and neutrophils in splenocytes. The cell numbers of CD4+T cells and NK cells were unchanged significantly when splenocytes were cultured under MMg compared with controls. However, MMg significantly increased the ratio of mature neutrophils to immature neutrophils in bone marrow and the cell number of DCs in splenocytes. Based on the cell survival ability, monocytes, macrophages and CD4+Foxp3+Treg cells are most sensitive to microgravity; CD4+T cells and NK cells are resistant to microgravity; CD8+T cells and neutrophils are impacted by short term microgravity exposure. Microgravity promoted the maturation of neutrophils and development of DCs in vitro. The present studies offered new insights on the direct effects of MMg on the survival and homeostasis of immune cell subsets.
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Acknowledgments
We thank Mrs Jianxia Peng for her expert technical assistance, Mrs Yanli Hao for her excellent laboratory management. This work was supported by grants from the National Basic Research Program of China (2011CB710903, 2010CB945301, YZ), the National Natural Science Foundation for General and Key Programs (C81130055, U0832003, YZ; C31200681, HL) the Strategic Pioneer Project on Space Science of Chinese Academy of Sciences (XDA04020202-19, YZ), and the CAS/SAFEA International Partnership Program for Creative Research Teams (Y.Z.)
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Chen, H., Luo, H., Liu, J. et al. The Distinctive Sensitivity to Microgravity of Immune Cell Subpopulations. Microgravity Sci. Technol. 27, 427–436 (2015). https://doi.org/10.1007/s12217-015-9441-1
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DOI: https://doi.org/10.1007/s12217-015-9441-1