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Related Concept Videos

Physical Properties of Amines01:26

Physical Properties of Amines

Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia01:30

Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia

Depending on the target organ, local anesthetics (LAs) can be administered via various routes. In surface anesthesia, LAs are applied directly to the surface of the skin or mucous membranes. It is widely used for topical skin numbing before venipuncture or minor surgical procedures. Commonly used surface local anesthetics are lidocaine or benzocaine sprays or creams. Surface anesthesia occurs within 5 minutes and lasts for about 60 minutes. One of the main disadvantages of topical anesthesia is...
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...
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...

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Related Experiment Video

Updated: Jul 2, 2026

Electrophysiological Methods to Assess Peripheral Pain Block in an Anesthetized Rat
08:05

Electrophysiological Methods to Assess Peripheral Pain Block in an Anesthetized Rat

Published on: November 21, 2025

TAAR1-Associated Trace Amines for Cutaneous Nociceptive Blockade in Rats.

Chong-Chi Chiu1,2, Li-Kai Wang3, Yu-Wen Chen4,5

  • 1Department of General Surgery and Department of Medical Education and Research, E-Da Cancer Hospital, I-Shou University, Kaohsiung, Taiwan.

Fundamental & Clinical Pharmacology
|June 30, 2026
PubMed
Summary
This summary is machine-generated.

Trace amines like beta-phenylethylamine show potential for cutaneous nociceptive blockade, similar to lidocaine. Further research into these trace amine-associated receptor 1 (TAAR1) agonists may offer new analgesic strategies.

Keywords:
N‐methyltyramineinfiltrative cutaneous analgesiaoctopaminetryptaminetyramineβ‐phenylethylamine

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Published on: September 2, 2020

Area of Science:

  • Pharmacology and Toxicology
  • Neuroscience
  • Pain Research

Background:

  • Trace amines are endogenous compounds interacting with trace amine-associated receptor 1 (TAAR1).
  • TAAR1 agonists are being investigated for various physiological effects, including potential analgesic properties.
  • Lidocaine serves as a benchmark local anesthetic for comparison.

Purpose of the Study:

  • To evaluate the cutaneous nociceptive blockade efficacy of TAAR1-associated trace amines.
  • To compare the potency and duration of action of these trace amines against lidocaine.
  • To investigate the effect of clonidine and epinephrine on the duration of action.

Main Methods:

  • Cutaneous nociceptive blockade was assessed in rats via the inhibition of the cutaneous trunci muscle reflex.
  • Subcutaneous injections of beta-phenylethylamine, tryptamine, octopamine, tyramine, and N-methyltyramine were administered.
  • Dose-response relationships and ED50 values were determined and compared to lidocaine.

Main Results:

  • Beta-phenylethylamine, tryptamine, octopamine, tyramine, and N-methyltyramine demonstrated cutaneous nociceptive blockade.
  • Beta-phenylethylamine was the most potent among the tested trace amines but less potent than lidocaine (ED50: 85.5 vs 17.7 μmol/kg).
  • Beta-phenylethylamine exhibited a similar duration of action to lidocaine, unaffected by clonidine or epinephrine.

Conclusions:

  • TAAR1-associated trace amines, particularly beta-phenylethylamine, possess local anesthetic properties.
  • While less potent than lidocaine, beta-phenylethylamine offers a comparable duration of action.
  • These findings suggest potential therapeutic applications for TAAR1 agonists in pain management.