An age-related numerical and functional deficit in CD19+CD24hiCD38hi B cells is associated with an increase in systemic autoimmunity
Article first published online: 19 JUL 2013
© 2013 The Authors. Aging Cell published by the Anatomical Society and John Wiley & Sons Ltd.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Volume 12, Issue 5, pages 873–881, October 2013
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How to Cite
Duggal, N. A., Upton, J., Phillips, A. C., Sapey, E. and Lord, J. M. (2013), An age-related numerical and functional deficit in CD19+CD24hiCD38hi B cells is associated with an increase in systemic autoimmunity. Aging Cell, 12: 873–881. doi: 10.1111/acel.12114
- Issue published online: 11 SEP 2013
- Article first published online: 19 JUL 2013
- Accepted manuscript online: 11 JUN 2013 10:33AM EST
- Manuscript Accepted: 3 JUN 2013
- Research Councils UK New Dynamics of Ageing initiative. Grant Number: RES-356-25-0011
- B cells;
- cellular immunology;
- rheumatoid factor
Autoimmunity increases with aging indicative of reduced immune tolerance, but the mechanisms involved are poorly defined. In recent years, subsets of B cells with immunoregulatory properties have been identified in murine models of autoimmune disorders, and these cells downregulate immune responses via secretion of IL10. In humans, immature transitional B cells with a CD19+CD24hiCD38hi phenotype have been reported to regulate immune responses via IL10 production. We found the frequency and numbers of CD19+CD24hiCD38hi cells were reduced in the PBMC pool with age. IL10 expression and secretion following activation via either CD40, or Toll-like receptors was also impaired in CD19+CD24hiCD38hi B cells from healthy older donors. When investigating the mechanisms involved, we found that CD19+CD24hiCD38hi B-cell function was compromised by age-related effects on both T cells and B cells: specifically, CD40 ligand expression was lower in CD4 T cells from older donors following CD3 stimulation, and signalling through CD40 was impaired in CD19+CD24hiCD38hi B cells from elders as evidenced by reduced phosphorylation (Y705) and activation of STAT3. However, there was no age-associated change in expression of costimulatory molecules CD80 and CD86 on CD19+CD24hiCD38hi cells, suggesting IL10-dependent immune suppression is impaired, but contact-dependent suppressive capacity is intact with age. Finally, we found a negative correlation between CD19+CD24hiCD38hi B-cell IL10 production and autoantibody (Rheumatoid factor) levels in older adults. We therefore propose that an age-related decline in CD19+CD24hiCD38hi B cell number and function may contribute towards the increased autoimmunity and reduced immune tolerance seen with aging.