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Related Concept Videos

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Related Experiment Video

Updated: Oct 16, 2025

Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors
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Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors

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Itch: Pathogenesis and treatment.

Nishadh Sutaria1, Waleed Adawi1, Rebecca Goldberg1

  • 1Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, Maryland.

Journal of the American Academy of Dermatology
|October 14, 2021
PubMed
Summary
This summary is machine-generated.

Understanding itch involves histaminergic and nonhistaminergic pathways, immune-neural crosstalk, and cytokine signaling. Tailoring treatments for chronic pruritus, especially with Th2 polarization, is key for effective itch management.

Keywords:
itchmanagementpathogenesispathophysiologypruritustherapeuticstreatments

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Area of Science:

  • Immunology
  • Neuroscience
  • Dermatology

Background:

  • Itch (pruritus) is transmitted via distinct pathways, including histaminergic and nonhistaminergic routes.
  • Nerve fibers (type C and Aδ) and receptor families (GPCRs, TRP channels) are crucial for itch signaling.
  • Immune and neural system interactions significantly modulate itch at multiple levels.

Purpose of the Study:

  • To elucidate the complex pathogenesis of itch.
  • To explore the role of Th2 cytokines and the opioidergic system in itch.
  • To discuss current and emerging therapeutic strategies for various itch subtypes.

Main Methods:

  • Review of current scientific literature on itch pathogenesis.
  • Analysis of molecular pathways involved in itch transmission.
  • Examination of therapeutic targets and treatment approaches.

Main Results:

  • Th2 cytokines (IL-4, IL-13, IL-31, TSLP) act as key pruritogens via Janus kinase pathways.
  • Opioidergic system dysregulation (increased μ-opioid, decreased κ-opioid activity) contributes to itch.
  • Th2 polarization, indicated by eosinophils, guides treatment for chronic pruritus of unknown origin.

Conclusions:

  • Targeting Th2 cytokines and the opioidergic system offers novel therapeutic avenues for itch.
  • Personalized treatment strategies based on itch etiology and biomarkers are essential.
  • Further research into itch mechanisms will drive the development of more effective itch therapies.