This research identifies two independent neuronal circuits in the skin that separate the regulation of inflammation from the sensation of itch during allergic contact dermatitis. By using advanced single-cell RNA sequencing, the authors discovered that a specific group of NP1 nociceptors undergoes a unique transcriptional reprogramming similar to a nerve injury response. These modified neurons are solely responsible for driving itch-evoked behavior, whereas a separate group of TRPV1+ neurons functions to suppress neutrophil infiltration and prevent excessive tissue damage. This functional division suggests that skin-projecting neurons possess significant plasticity, adapting their molecular identities to manage different aspects of the disease. Ultimately, the findings highlight that itch and inflammation are not coupled processes but are controlled by distinct sensory pathways, offering new targets for clinical treatments.

References:

• Voisin T, Gheziel N, El Samrout C, et al. Skin inflammation and itch response are independently regulated by distinct nociceptor subsets[J]. Immunity, 2026.