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Related Concept Videos

Sensory Functions of the Skin01:16

Sensory Functions of the Skin

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The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
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Related Experiment Video

Updated: Apr 17, 2026

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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Molecular dissection of itch.

Mark A Hoon1

  • 1Molecular Genetics Unit, Laboratory of Sensory Biology, NIDCR, NIH, Building 35, Room 3F145, 35 Convent Drive, Bethesda, MD 20892, United States.

Current Opinion in Neurobiology
|February 21, 2015
PubMed
Summary

Recent research reveals distinct molecular and cellular pathways for itch sensation. These findings highlight specific receptors and spinal cord circuits that separate itch from other sensory inputs like pain and touch.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Somatic Sensation

Background:

  • Itch sensation is a complex sensory experience.
  • Understanding the molecular and cellular underpinnings of itch is crucial for developing targeted therapies.
  • Previous research has begun to explore the neural pathways involved in itch.

Purpose of the Study:

  • To summarize recent advances in the molecular and cellular basis of itch sensation.
  • To highlight the segregation of itch signals from other somatosensory modalities.
  • To elucidate the role of dedicated receptors, transmitters, and spinal cord circuits in itch specificity.

Main Methods:

  • Review of recent scientific literature on itch.
  • Analysis of studies identifying new receptors involved in pruritogen detection.

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  • Characterization of spinal cord itch circuits and their neurochemical signaling.

    • Main Results:

    • Itch sensory signals are segregated from pain, touch, and thermosensation.
    • Dedicated receptors and transmitters in specific sensory neurons detect pruritogens.
    • Itch specificity is maintained in the spinal cord via distinct neurotransmitters and cellular pathways.

    Conclusions:

    • Recent discoveries underscore the specificity of itch signaling at both the peripheral and central nervous system levels.
    • Dedicated molecular and cellular mechanisms ensure that itch is processed distinctly from other somatosensory inputs.
    • Further research into these specific pathways holds promise for understanding and treating itch disorders.