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C3/C3aR Bridges Spinal Astrocyte-Microglia Crosstalk and Accelerates Neuroinflammation in Morphine-Tolerant Rats
Xiaoling Peng1, Jie Ju1, Zheng Li1
1Department of Anesthesiology and Pain Medicine, Hubei Key Laboratory of Geriatric Anesthesia and Perioperative Brain Health, and Wuhan Clinical Research Center for Geriatric Anesthesia, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
CNS Neuroscience & Therapeutics
|January 13, 2025
Summary
The C3-C3aR axis amplifies neuroinflammation and glial cell communication, contributing to morphine tolerance. Inhibiting this axis may offer therapeutic benefits for managing morphine tolerance.
Area of Science:
- Neuroimmunology
- Neuropharmacology
- Glial Cell Biology
Background:
- Glial cell communication modulates neuroimmune pathology.
- Glial cells and neuroinflammation play a detrimental role in morphine tolerance (MT).
Purpose of the Study:
- To investigate the influence of astrocyte and microglia crosstalk on morphine tolerance.
- To elucidate the role of the C3-C3aR axis in morphine tolerance.
Main Methods:
- Established a morphine-tolerant rat model using intrathecal morphine administration.
- Utilized tail-flick latency tests to assess analgesic effects.
- Employed real-time quantitative PCR, Western blot, and immunofluorescence to analyze microglia, astrocyte, and C3-C3aR axis involvement.
Main Results:
- Chronic morphine induced microglia activation and upregulated pro-inflammatory mediators (IL-1α, TNFα, C1q).
- Astrocytes were programmed to a pro-inflammatory A1 phenotype, expressing C3 and serping1.
- Inhibitors of CSF1R, C3, and C3aR reversed pathological processes and alleviated morphine tolerance.
Conclusions:
- The C3-C3aR axis acts as an amplifier of microglia-astrocyte crosstalk and neuroinflammation.
- This axis represents a potential therapeutic target for managing morphine tolerance.
