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Published on: June 14, 2020
HMGB1 released from nociceptors mediates inflammation.
Huan Yang1, Qiong Zeng2, Harold A Silverman2
1Laboratory of Biomedical Sciences, Institute of Bioelectronic Medicine, Feinstein Institutes for Medical Research, Northwell Health, Manhasset, NY 11030; HYang@northwell.edu schavan@northwell.edu kjtracey@northwell.edu.
Nociceptor release of High Mobility Group Box 1 (HMGB1) contributes to neurogenic inflammation and pain. Silencing neuronal HMGB1 protected mice from inflammation and allodynia in injury and arthritis models.
Area of Science:
- Neuroscience
- Immunology
- Pain Research
Background:
- Inflammation is a key defense mechanism triggered by injury and infection.
- Specialized sensory neurons (nociceptors) detect these triggers and mediate inflammation via neurogenic inflammation.
- High Mobility Group Box 1 (HMGB1) is a known inflammatory mediator synthesized by neurons.
Purpose of the Study:
- To investigate the role of nociceptor-released HMGB1 in neurogenic inflammation and pain.
- To determine if HMGB1 released by nociceptors is a component of the neuroinflammatory response.
Main Methods:
- Utilized transgenic mice with light-activated nociceptors (expressing channelrhodopsin-2) to stimulate direct HMGB1 release.
- Generated mice with silenced neuronal HMGB1 expression (Syn-Cre/HMGB1fl/fl) for injury and disease models.
- Assessed inflammation and allodynia following sciatic nerve injury and collagen antibody-induced arthritis.
Main Results:
- Light stimulation of transgenic nociceptors induced direct HMGB1 release.
- Syn-Cre/HMGB1fl/fl mice showed protection from cutaneous inflammation and allodynia after sciatic nerve injury compared to controls.
- These mice were also protected from allodynia and joint inflammation in a collagen antibody-induced arthritis model.
Conclusions:
- Nociceptor-derived HMGB1 plays a critical role in mediating pain and inflammation.
- Targeting nociceptor HMGB1 could be a therapeutic strategy for inflammatory pain conditions.
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