Abstract
Although inflammatory immune cells clearly contribute to the development of middle cerebral artery occlusion (MCAO) in mice, the failure to block neutrophil-associated injury in clinical stroke trials has discouraged further development of immunotherapeutic approaches. However, there is renewed interest in a possible protective role for regulatory T and B cells that can suppress inflammation and limit central nervous system damage induced by infiltrating pro-inflammatory cells. Our failure to implicate CD4+FoxP3+ T cells in limiting brain lesion volume after MCAO turned our focus towards regulatory B cells known to mediate protection against other inflammatory CNS conditions. Our results clearly demonstrated that B cell-deficient mice developed larger infarct volumes, higher mortality, and more severe functional deficits compared to wild-type mice and had increased numbers of activated T cells, macrophages, microglial cells, and neutrophils in the affected brain hemisphere. These MCAO-induced changes were completely prevented in B cell-restored mice after transfer of highly purified WT B cells but not IL-10-deficient B cells. Our novel observations are the first to implicate IL-10-secreting B cells as a major regulatory cell type in stroke and suggest that enhancement of regulatory B cells might have application as a novel therapy for this devastating neurologic condition.
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Acknowledgments
The authors wish to thank Ms. Eva Niehaus for assistance with manuscript preparation. This work was supported by NIH grants NS075887 (HO) and NR003521 (PDH). This material is the result of work supported with resources and the use of facilities at the Portland VA Medical Center, Portland, OR. The contents do not represent the views of the Department of Veterans Affairs or the US government.
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Offner, H., Hurn, P.D. A Novel Hypothesis: Regulatory B Lymphocytes Shape Outcome from Experimental Stroke. Transl. Stroke Res. 3, 324–330 (2012). https://doi.org/10.1007/s12975-012-0187-4
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DOI: https://doi.org/10.1007/s12975-012-0187-4