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Related Concept Videos

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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.
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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.
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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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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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A neuropeptide code for itch.

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  • 1Center for the Study of Itch and Sensory Disorders, Washington University School of Medicine, St Louis, MO, USA. chenz@wustl.edu.

Nature Reviews. Neuroscience
|October 19, 2021
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Summary

New research reveals that specific neuropeptides, like gastrin-releasing peptide (GRP), distinguish itch from pain. These molecules relay itch signals to the spinal cord, forming a key pathway for itch sensation.

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Last Updated: Oct 16, 2025

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Area of Science:

  • Neuroscience
  • Physiology

Background:

  • Itch is a fundamental sensation crucial for animal well-being.
  • Understanding the neural encoding of itch has been a long-standing scientific challenge.
  • Recent advances have significantly transformed the understanding of itch mechanisms.

Purpose of the Study:

  • To elucidate the molecular and neural distinctions between itch and pain pathways.
  • To identify specific neuropeptides involved in itch signaling.
  • To propose a model for itch information processing in the nervous system.

Main Methods:

  • Review and synthesis of accumulating evidence on itch mechanisms.
  • Focus on the role of neuropeptides in distinguishing itch from pain.
  • Investigation of spinal cord circuits involved in itch transmission.

Main Results:

  • Evidence suggests itch is differentiated from pain by specific neuropeptides.
  • Classical neurotransmitters modulate itch but do not encode its specificity.
  • Gastrin-releasing peptide (GRP) is identified as a key itch-specific neuropeptide.

Conclusions:

  • Itch specificity is conveyed by neuropeptides, not classical neurotransmitters.
  • Spinal neurons expressing GRP receptor (GRPR) are critical for itch transmission.
  • A convergent circuit model is proposed for relaying peripheral itch information to the brain.