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Encoding of inflammatory hyperalgesia in mouse spinal cord
Omer Barkai1,2,3, Prudhvi Raj Rayi1,2, Rachely Butterman1,2
1Department of Medical Neurobiology, Institute for Medical Research Israel-Canada, The Hebrew University-Hadassah School of Medicine, Jerusalem, Israel.
Pain
|September 23, 2022
Summary
Inflammation alters pain signaling in the superficial dorsal spinal cord (SDH) network. Following burn injury, previously unresponsive neurons activate, amplifying pain signals and promoting hyperalgesia.
Area of Science:
- Neuroscience
- Pain research
- Spinal cord circuitry
Background:
- Peripheral inflammation enhances nociceptive neuron firing.
- The superficial dorsal horn (SDH) integrates noxious information in the spinal cord.
- Understanding SDH network dynamics during inflammation is crucial for pain management.
Purpose of the Study:
- To characterize SDH network activity in response to noxious stimuli under normal and inflammatory conditions.
- To investigate how acute burn injury-induced inflammation alters SDH network responsiveness.
- To elucidate the mechanisms by which SDH network changes contribute to hyperalgesia.
Main Methods:
- In vivo calcium imaging in mice to monitor neuronal activity.
- Computational modeling to analyze SDH network dynamics.
- Induction of acute burn injury to simulate inflammatory pain.
Main Results:
- Noxious heat stimuli increase overall SDH network activity in naive mice.
- Inflammatory hyperalgesia leads to activation of previously nonresponsive SDH neurons.
- Increased afferent activity mimics the inflammatory SDH response pattern.
Conclusions:
- The SDH network undergoes dynamic changes during acute peripheral inflammation.
- These changes involve activation of dormant neurons and desuppression of inhibited neurons.
- Altered SDH network activity amplifies pain output to higher brain centers, promoting hyperalgesia.
