Abstract
Clinical stroke induces inflammatory processes leading to cerebral and splenic injury and profound peripheral immunosuppression. IL-10 expression is elevated during major CNS diseases and limits inflammation in the brain. Recent evidence demonstrated that absence of B-cells led to larger infarct volumes and CNS damage after middle cerebral artery occlusion (MCAO) that could be prevented by transfer of IL-10+ B-cells. The purpose of this study was to determine if the beneficial immunoregulatory effects on MCAO of the IL-10+ B-cell subpopulation also extends to B-cell-sufficient mice that would better represent stroke subjects. CNS inflammation and infarct volumes were evaluated in male C57BL/6J (WT) mice that received either RPMI or IL-10+ B-cells and underwent 60 min of middle cerebral artery occlusion (MCAO) followed by 96 h of reperfusion. Transfer of IL-10+ B-cells markedly reduced infarct volume in WT recipient mice when given 24 h prior to or 4 h after MCAO. B-cell protected (24 h pre-MCAO) mice had increased regulatory subpopulations in the periphery, reduced numbers of activated, inflammatory T-cells, decreased infiltration of T-cells and a less inflammatory milieu in the ischemic hemispheres of the IL-10+ B-cell-treated group. Moreover, transfer of IL-10+ B-cells 24 h before MCAO led to a significant preservation of regulatory immune subsets in the IL-10+ B-cell protected group presumably indicating their role in immunomodulatory mechanisms, post-stroke. Our studies are the first to demonstrate a major immunoregulatory role for IL-10+ regulatory B-cells in preventing and treating MCAO in WT mice and also implicating their potential role in attenuating complications due to post-stroke immunosuppression.
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Abbreviations
- CNS:
-
Central nervous system
- MCAO:
-
Middle cerebral artery occlusion
- WT:
-
wild-type
- TNF-α:
-
Tumor necrosis factor α
- INF-γ:
-
Interferon γ
- CD:
-
Cluster of Differentiation
- MHC II:
-
Major Histocompatibility Complex II
- RPMI:
-
Roswell Park Memorial Institute
- IL:
-
Interleukin
- PBS:
-
Phosphate-buffered saline
- DNase I:
-
Deoxyribonuclease I
- FACS:
-
Fluorescence Activated Cell Sorter
- PI:
-
Propidium iodide
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Acknowledgments
The authors wish to thank Andrew Lapato for technical assistance and Melissa S. Barber for assistance with manuscript submission. This work was supported by NIH/NINDS 1RO1 NS075887. This material is based upon work supported in part by the Department of Veterans Affairs, Veterans Health Administration, Office of Research and Development, Biomedical Laboratory Research and Development. The contents do not represent the views of the Department of Veterans Affairs or the United States Government.
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The authors declare no competing financial interests.
Authors’ contribution
SB designed, performed the immunology experiments, carried out statistical analyses, prepared graphics and wrote the manuscript; YC performed the MCAO procedures, carried out statistical analyses, prepared the graphics and wrote the methods and results for infarct volume data; AAV critiqued and edited the manuscript; SJM directed study design and data analysis of the MCAO experiments and edited the manuscript; HO directed the overall study, supervised the immunological studies and data analysis and edited the manuscript. All authors read and approved the final version of the manuscript
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Sheetal Bodhankar and Yingxin Chen contributed equally to this work.
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Bodhankar, S., Chen, Y., Vandenbark, A.A. et al. Treatment of experimental stroke with IL-10-producing B-cells reduces infarct size and peripheral and CNS inflammation in wild-type B-cell-sufficient mice. Metab Brain Dis 29, 59–73 (2014). https://doi.org/10.1007/s11011-013-9474-3
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DOI: https://doi.org/10.1007/s11011-013-9474-3