Sensory itch pathways

Sensory itch pathways" is not a specific molecule, protein, receptor, or gene, but rather a broad term encompassing the entire set of neural, molecular, and cellular events responsible for the sensation and transmission of itch from the periphery (skin) to the central nervous system. These pathways include a diverse set of **peripheral sensory neurons** (notably C-fibers and Aδ fibers), **transient receptor potential (TRP) channels** such as TRPV1, TRPA1, and TRPV4, **histamine and non-histamine receptors** (e.g., H1R, PAR-2, GRPR), multiple cytokine receptors (for IL-4, IL-13, IL-31), and the interactions with immune cells in the skin (mast cells, basophils, eosinophils, T cells, keratinocytes). The pathways involve the **release and detection of pruritogens** (itch-inducing molecules) like histamine, IL-31, and various neuropeptides, which activate receptors leading to depolarization of sensory neurons and eventual transmission of "itch" signals to the spinal cord and brain[1][2][5][7]. These mechanisms are essential in both **acute and chronic itch conditions**, such as atopic dermatitis and allergic reactions[3][5]. However, since "Sensory itch pathways" is not a single, discrete, or canonical biological entity (like a specific protein or receptor), it should **not be considered a therapeutic target in the standard sense**. Instead, it is a conceptual framework encompassing multiple molecular targets, several of which are considered therapeutic targets individually (e.g., TRPV1, GRPR, IL-31 receptor)[1][4][6]. Therefore, this entry represents **too broad a category for structured molecular annotation**—the information is too general and does not refer to one specific target.

Other names

Itch signaling pathwaysPruritus pathwaysSensory pathways of itch