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Nociception

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.

Analgesia and Pain Management

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...

Pain

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...

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Related Experiment Video

Updated: Dec 28, 2025

Rapid Isolation of Dorsal Root Ganglion Macrophages

Rapid Isolation of Dorsal Root Ganglion Macrophages

Published on: September 7, 2019

Microbes, microglia, and pain.

Zoë Dworsky-Fried¹, Bradley J Kerr^1,2,3, Anna M W Taylor^1,2,3

¹Department of Pharmacology, University of Alberta, Edmonton T6G2H7, Canada.

Neurobiology of Pain (Cambridge, Mass.)

|February 20, 2020

Summary

This summary is machine-generated.

Chronic pain affects one in five people globally. Gut microbiome manipulation may reduce microglial activation and improve chronic pain outcomes by modulating gut-brain communication.

Keywords:

Chronic pain Gut microbiome Gut permeability Gut-brain axis Microglia Vagus nerve

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Last Updated: Dec 28, 2025

Rapid Isolation of Dorsal Root Ganglion Macrophages

Rapid Isolation of Dorsal Root Ganglion Macrophages

Published on: September 7, 2019

Preparation of Primary Mixed Glial Cultures from Adult Mouse Spinal Cord Tissue

Preparation of Primary Mixed Glial Cultures from Adult Mouse Spinal Cord Tissue

Published on: November 19, 2016

Magnetic Isolation of Microglial Cells from Neonate Mouse for Primary Cell Cultures

Magnetic Isolation of Microglial Cells from Neonate Mouse for Primary Cell Cultures

Published on: July 25, 2022

Area of Science:

Neuroscience
Immunology
Gastroenterology

Background:

Chronic pain is a widespread condition, affecting one in five people globally and increasing with age.
Its pathophysiology involves complex interactions within the nervous system, with microglia playing a key role.
Microglia, the CNS immune cells, are influenced by signals from both the CNS and the gastrointestinal tract.

Purpose of the Study:

To explore the connection between the gut microbiome and microglia in the context of chronic pain.
To discuss the mechanisms by which gut bacteria may influence microglial activity and pain persistence.
To highlight the potential of gut microbiome manipulation as a therapeutic strategy for chronic pain.

Main Methods:

Review of preclinical and clinical studies investigating gut-brain axis communication.
Analysis of the role of microglia in chronic pain pathways.
Examination of the impact of gut microbiome alterations on microglial activation and inflammation.

Main Results:

Emerging evidence links gut microbiome composition and function to microglial activation in chronic pain.
Gut microbiome-derived signals can modulate microglial reactivity, contributing to pain persistence.
Targeted interventions influencing the gut microbiome have shown promise in reducing microglial activation and inflammation.

Conclusions:

The gut microbiome represents a significant modulator of microglial function relevant to chronic pain.
Restoring or manipulating the gut microbiome may offer a novel therapeutic avenue for managing chronic pain.
Further research into gut-brain axis mechanisms is crucial for developing effective microbiome-targeted pain therapies.