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Mammals have evolved neurophysiologic reflexes, such as coughing and scratching, to expel invading pathogens and noxious environmental stimuli. It is well established that these responses are also associated with chronic inflammatory diseases, including asthma and atopic dermatitis. However, the mechanisms by which inflammatory pathways promote sensations such as itch remain poorly understood. Here,...
The cellular and molecular mechanisms mediating histamine-independent itch in primary sensory neurons are largely unknown. Itch induced by chloroquine (CQ) is a common side effect of this widely used antimalarial drug. Here, we show that Mrgprs, a family of G protein-coupled receptors expressed exclusively in peripheral sensory neurons, function as itch receptors. Mice lacking a cluster of Mrgpr genes...
Transient receptor potential vanilloid 1 (TRPV1) is a molecular sensor of noxious heat and capsaicin. Its channel activity can be modulated by several mechanisms. Here we identify a membrane protein, Pirt, as a regulator of TRPV1. Pirt is expressed in most nociceptive neurons in the dorsal root ganglia (DRG) including TRPV1-positive cells. Pirt null mice show impaired responsiveness to noxious heat...
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