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Related Concept Videos

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...
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...
Blood and Nerve Supply to the Bones01:29

Blood and Nerve Supply to the Bones

Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
Non-gated Ion Channels01:24

Non-gated Ion Channels

Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Chemotherapy-Induced Nausea and Vomiting: Cannabinoids

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Related Experiment Video

Updated: Jun 3, 2026

Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors
04:59

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

Published on: September 27, 2019

GCH1, BH4 and pain.

Alban Latremoliere1, Michael Costigan

  • 1FM Kirby Neurobiology Center, Children's Hospital Boston, Harvard Medical School, Boston, MA 02115, USA. Alban.Latremoliere@childrens.harvard.edu

Current Pharmaceutical Biotechnology
|April 7, 2011
PubMed
Summary
This summary is machine-generated.

Tetrahydrobiopterin (BH4) levels increase in sensory neurons after nerve damage, causing chronic pain. Targeting BH4 synthesis offers a new approach for developing novel analgesics to treat neuropathic pain.

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Last Updated: Jun 3, 2026

Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors
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Development of Recombinant Proteins to Treat Chronic Pain
10:37

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Determining heat and mechanical pain threshold in inflamed skin of human subjects
13:21

Determining heat and mechanical pain threshold in inflamed skin of human subjects

Published on: January 14, 2009

Area of Science:

  • Neuroscience
  • Biochemistry
  • Pharmacology

Background:

  • Neuropathic pain resulting from nerve injury is difficult to treat with current therapies.
  • Tetrahydrobiopterin (BH4) is a critical cofactor for neurotransmitter synthesis, influencing neuronal function.
  • Elevated BH4 levels in sensory neurons after nerve damage contribute to pain hypersensitivity.

Purpose of the Study:

  • To investigate the role of tetrahydrobiopterin (BH4) homeostasis in neuropathic pain.
  • To identify BH4 synthesis and metabolism as a potential therapeutic target for analgesia.
  • To explore the potential of BH4-modulating drugs for treating chronic pain.

Main Methods:

  • Analysis of BH4 levels in sensory neurons following peripheral nerve damage.
  • Investigation of GTP Cyclohydrolase 1 (GCH1) enzyme activity and its role in BH4 synthesis.
  • Characterization of a human GCH1 pain-protective haplotype.

Main Results:

  • Peripheral nerve damage leads to a significant increase in BH4 levels in sensory neurons.
  • Increased BH4 is primarily due to the upregulation of the rate-limiting enzyme, GTP Cyclohydrolase 1 (GCH1).
  • A naturally occurring GCH1 haplotype that reduces enzyme activity is associated with decreased pain levels.

Conclusions:

  • Dysregulation of BH4 homeostasis, particularly increased BH4 production, is a key mechanism in neuropathic pain.
  • Targeting BH4 synthesis, for example by inhibiting GCH1, represents a promising strategy for novel analgesic development.
  • BH4 pathway modulation offers a new therapeutic avenue for managing refractory chronic pain conditions.