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Related Concept Videos

Nociception01:44

Nociception

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. Thus, pain helps the...
Pain01:20

Pain

Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
Analgesia and Pain Management01:25

Analgesia and Pain Management

Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

Local Anesthetics: Differential Sensitivity of Nerve Fibers

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...
Nitric Oxide Signaling Pathway01:28

Nitric Oxide Signaling Pathway

Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...
Opioid Analgesics: Morphine and Other Natural Cogeners01:20

Opioid Analgesics: Morphine and Other Natural Cogeners

Opioids are a class of drugs that mimic endogenous opioid peptides and act on opioid receptors, and help in pain relief. These compounds are classified as natural, synthetic, or semi-synthetic. Natural opioids, like morphine, codeine, and thebaine, are derived from the opium poppy plant (Papaver somniferum or Papaver album) and are termed opiates. Synthetic opioids are artificial, while semi-synthetic opioids combine natural and synthetic compounds. Morphine, a prototypical opioid, possesses a...

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Updated: Jun 3, 2026

Optimizing Photoneuromodulation Techniques to Evaluate the Role of Green Light-Emitting Diodes in Pain Management
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Carbon monoxide: a gas that modulates nociception.

Wenguo Fan1, Fang Huang, Zhi Wu

  • 1Department of Oral Anatomy and Physiology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China.

Journal of Neuroscience Research
|March 23, 2011
PubMed
Summary

Carbon monoxide (CO), a neuromodulator, plays a role in pain processing. Its effects are mediated by heme oxygenase (HO) enzymes, influencing both normal sensory transmission and pathological pain conditions.

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Last Updated: Jun 3, 2026

Optimizing Photoneuromodulation Techniques to Evaluate the Role of Green Light-Emitting Diodes in Pain Management
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Area of Science:

  • Neuroscience
  • Pain Research
  • Biochemistry

Background:

  • Carbon monoxide (CO) functions as an atypical neurotransmitter/neuromodulator in the nervous system.
  • Evidence suggests CO's involvement in various neuronal activities, including nociception.
  • The complexity of CO's role in pain is linked to the regulation of heme oxygenase (HO) enzymes.

Purpose of the Study:

  • To review the latest evidence on CO's role in normal sensory transmission.
  • To examine CO's involvement in pathological pain conditions.
  • To discuss cellular mechanisms underlying CO's role in pain.

Main Methods:

  • Literature review of recent studies on carbon monoxide and pain.
  • Analysis of research on heme oxygenase enzyme regulation.
  • Synthesis of findings on CO's cellular mechanisms in nociception.

Main Results:

  • Carbon monoxide is implicated in both normal pain signaling and the development of pathological pain.
  • Differential regulation of heme oxygenase enzymes significantly impacts CO's role.
  • Multiple cellular pathways are involved in CO's modulation of pain.

Conclusions:

  • Carbon monoxide is a key player in pain modulation, acting via heme oxygenase pathways.
  • Understanding CO's mechanisms offers potential therapeutic targets for pain management.
  • Further research is needed to fully elucidate CO's complex role in nociception.