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Toll-Like Receptor 8-Mediated Reversal of CD4+ Regulatory T Cell Function
Guangyong Peng,Zhong Guo,Yukiko Kiniwa,Kui shin Voo,Weiyi Peng,Tihui Fu,Daniel Y. Wang,Yanchun Li,Helen Y. Wang,Rong-Fu Wang*
CD4+ regulatory T (Treg) cells have a profound ability to suppresshost immune responses, yet little is understood about how thesecells are regulated. We describe a mechanism linking Toll-likereceptor (TLR) 8 signaling to the control of Treg cell function,in which synthetic and natural ligands for human TLR8 can reverseTreg cell function. This effect was independent of dendriticcells but required functional TLR8-MyD88-IRAK4 signaling inTreg cells. Adoptive transfer of TLR8 ligand-stimulated Tregcells into tumor-bearing mice enhanced anti-tumor immunity.These results suggest that TLR8 signaling could play a criticalrole in controlling immune responses to cancer and other diseases.
The Center for Cell and Gene Therapy and Department of Immunology, Baylor College of Medicine, Houston, TX 77030, USA.
* To whom correspondence should be addressed. E-mail: Rongfuw{at}bcm.tmc.edu
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