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Pharmacology of Itch pp 39–55Cite as

Neurophysiology and Itch Pathways

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Part of the book series: Handbook of Experimental Pharmacology ((HEP,volume 226))

Abstract

As we all can easily differentiate the sensations of itch and pain, the most straightforward neurophysiologic concept would consist of two specific pathways that independently encode itch and pain. Indeed, a neuronal pathway for histamine-induced itch in the peripheral and central nervous system has been described in animals and humans, and recently several non-histaminergic pathways for itch have been discovered in rodents that support a dichotomous concept differentiated into a pain and an itch pathway, with both pathways being composed of different “flavors.” Numerous markers and mediators have been found that are linked to itch processing pathways. Thus, the delineation of neuronal pathways for itch from pain pathways seemingly proves that all sensory aspects of itch are based on an itch-specific neuronal pathway. However, such a concept is incomplete as itch can also be induced by the activation of the pain pathway in particular when the stimulus is applied in a highly localized spatial pattern. These opposite views reflect the old dispute between specificity and pattern theories of itch. Rather than only being of theoretic interest, this conceptual problem has key implication for the strategy to treat chronic itch as key therapeutic targets would be either itch-specific pathways or unspecific nociceptive pathways.

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Authors and Affiliations

  1. Faculty of Medicine Mannheim, Department of Anesthesiology and Intensive Care Medicine, University of Heidelberg, Theodor-Kutzer Ufer 1-3, 68167, Mannheim, Germany

    Martin Schmelz

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  1. Department of Pharmacology Center for Substance Abuse Research, Temple University School of Medicine, Philadelphia, Pennsylvania, USA

    Alan Cowan

  2. Department of Dermatology, Temple University School of Medicine, Philadephia, Pennsylvania, USA

    Gil Yosipovitch

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Schmelz, M. (2015). Neurophysiology and Itch Pathways. In: Cowan, A., Yosipovitch, G. (eds) Pharmacology of Itch. Handbook of Experimental Pharmacology, vol 226. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-44605-8_3

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