The first two authors contributed equally to this work.
Toll-like receptor expression in murine DC subsets: lack of TLR7 expression by CD8α+ DC correlates with unresponsiveness to imidazoquinolines
Article first published online: 7 MAR 2003
© 2002 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
European Journal of Immunology
Volume 33, Issue 4, pages 827–833, April 2003
How to Cite
Edwards, Alexander D., Diebold, Sandra S., Slack, Emma M. C., Tomizawa, H., Hemmi, H., Kaisho, T., Akira, S. and Sousa, C. (2003), Toll-like receptor expression in murine DC subsets: lack of TLR7 expression by CD8α+ DC correlates with unresponsiveness to imidazoquinolines. Eur. J. Immunol., 33: 827–833. doi: 10.1002/eji.200323797
- Issue published online: 7 MAR 2003
- Article first published online: 7 MAR 2003
- Manuscript Accepted: 27 JAN 2003
- Manuscript Received: 30 DEC 2002
- Dendritic cell;
- Toll-like receptor;
Toll-like receptors (TLR) recognize microbial and viral patterns and activate dendritic cells (DC). TLR distribution among human DC subsets is heterogeneous: plasmacytoid DC (PDC) express TLR1, 7 and 9, while other DC types do not express TLR9 but express other TLR. Here, we report that mRNA for most TLR is expressed at similar levels by murine splenic DC sub-types, including PDC, but that TLR3 is preferentially expressed by CD8α+ DC while TLR5 and TLR7 are selectively absent from the same subset. Consistent with the latter, TLR7 ligand activates CD8α– DC and PDC, but not CD8α+ DC as measured by survival ex vivo, up-regulation of surface markers and production of IL-12p40. These data suggest that the dichotomy in TLR expression between plasmacytoid and non-plasmacytoid DC is not conserved between species. However, lack of TLR7 expression could restrict the involvement of CD8α+ DC in recognition of certain mouse pathogens.