Liu and colleagues report that toll-like receptor 7 (TLR7), which is typically thought to be expressed in immune cells and to function to regulate innate immunity, is expressed and acts in C-fiber primary sensory neurons. In mice, they find that TLR7 is important for inducing itch, but is not necessary for eliciting pain.
- Tong Liu
- Zhen-Zhong Xu
- Ru-Rong Ji