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The multiple pathways for itch and their interactions with pain

Journal

TRENDS IN NEUROSCIENCES
Volume 33, Issue 12, Pages 550-558

Publisher

ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tins.2010.09.002

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Funding

  1. W.M. Keck Foundation
  2. National Institute of Neurological Disorders and Stroke [NS047399]

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Multiple neural pathways and molecular mechanisms responsible for producing the sensation of itch have recently been identified, including histamine-independent pathways. Physiological, molecular, behavioral and brain imaging studies are converging on a description of these pathways and their close association with pain processing. Some conflicting results have arisen and the precise relationship between itch and pain remains controversial. A better understanding of the generation of itch and of the intrinsic mechanisms that inhibit itch after scratching should facilitate the search for new methods to alleviate clinical pruritus (itch). In this review we describe the current understanding of the production and inhibition of itch. A model of itch processing within the CNS is proposed.

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