The CD14brightCD16+ monocyte subset is expanded in rheumatoid arthritis and promotes expansion of the Th17 cell population
Version of Record online: 28 FEB 2012
Copyright © 2012 by the American College of Rheumatology
Arthritis & Rheumatism
Volume 64, Issue 3, pages 671–677, March 2012
How to Cite
Rossol, M., Kraus, S., Pierer, M., Baerwald, C. and Wagner, U. (2012), The CD14brightCD16+ monocyte subset is expanded in rheumatoid arthritis and promotes expansion of the Th17 cell population. Arthritis & Rheumatism, 64: 671–677. doi: 10.1002/art.33418
- Issue online: 28 FEB 2012
- Version of Record online: 28 FEB 2012
- Accepted manuscript online: 17 OCT 2011 11:31AM EST
- Manuscript Accepted: 11 OCT 2011
- Manuscript Received: 9 DEC 2010
- DFG. Grant Number: RO 4037/1-1
Circulating monocytes contain a subpopulation of CD14+CD16+ cells; this subpopulation of cells has been described to be proinflammatory and to have an increased frequency in rheumatoid arthritis (RA). New evidence suggests that this subpopulation can be further subdivided into CD14dimCD16+ and CD14brightCD16+ cells. The aim of this study was to determine which of the two CD16+ monocyte subpopulations is expanded in patients with RA and to investigate their possible role in disease pathogenesis.
The frequencies of monocyte subpopulations in the peripheral blood of healthy donors and patients with RA were determined by flow cytometry. Monocyte subpopulations were sorted and cocultured with CD4+ T cells. Cytokines were determined in the supernatant, and Th17 cell frequencies were measured by flow cytometry.
In comparison with the other monocyte subpopulations, CD14brightCD16+ cells showed higher HLA–DR and CCR5 expression and responded with higher tumor necrosis factor production to direct cell contact with preactivated T cells. They were observed at increased frequencies in the peripheral blood of patients with RA, while CD14dimCD16+ monocyte frequencies were not increased. CD14brightCD16+ cells were extremely potent inducers of Th17 cell expansion in vitro. Their frequency in the peripheral blood of patients with RA correlated closely with Th17 cell frequencies determined ex vivo.
This study is the first to provide a link between the increased frequency of the CD14brightCD16+ monocyte subpopulation in RA and the expansion of Th17 cells, which are likely to have a role in the pathogenesis of autoimmunity.