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Published on: March 29, 2017
The cholinergic anti-inflammatory pathway: a critical review
D Martelli1, M J McKinley2, R M McAllen3
1Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, Victoria 3010, Australia; Department of Biomedical and Neuromotor Sciences, Physiology Division, University of Bologna, Italy.
Electrical vagus nerve stimulation suppresses inflammation by acting on the spleen. This pathway involves T lymphocytes and nicotinic receptors, highlighting a non-neural anti-inflammatory mechanism.
Area of Science:
- Neuroimmunology
- Inflammation Research
- Autonomic Nervous System
Background:
- The cholinergic anti-inflammatory pathway modulates immune responses.
- Understanding its mechanism is crucial for treating inflammatory diseases.
Purpose of the Study:
- To critically review evidence on the cholinergic anti-inflammatory pathway.
- To elucidate its mode of action and key components.
Main Methods:
- Literature review of studies on vagal nerve stimulation and inflammation.
- Analysis of evidence regarding the spleen's role and neural/non-neural components.
Main Results:
- Vagal stimulation suppresses local and systemic inflammation, primarily via the spleen.
- The spleen's response to endotoxin is mediated by noradrenaline nerve terminals.
- Acetylcholine-synthesizing T lymphocytes and alpha-7 nicotinic receptors are essential.
- No direct vagus-to-spleen neural connection was found.
Conclusions:
- The vagal anti-inflammatory pathway is a key regulator of systemic inflammation.
- This pathway involves a non-neural splenic component and specific receptors.
- It can be pharmacologically or electrically activated for therapeutic potential.
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