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Updated: Jul 7, 2025
Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention
Published on: October 16, 2013
Microglia facilitate and stabilize the response to general anesthesia via modulating the neuronal network in a brain
Yang He1, Taohui Liu1, Quansheng He1
1Department of Neurosurgery, Huashan Hospital, Institute for Translational Brain Research, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science, MOE Innovative Center for New Drug Development of Immune Inflammatory Diseases, Fudan University, Shanghai, China.
Abstract:
General anesthesia leads to a loss of consciousness and an unrousable state in patients. Although general anesthetics are widely used in clinical practice, their underlying mechanisms remain elusive. The potential involvement of nonneuronal cells is unknown. Microglia are important immune cells in the central nervous system (CNS) that play critical roles in CNS function and dysfunction. We unintentionally observed delayed anesthesia induction and early anesthesia emergence in microglia-depleted mice. We found that microglial depletion differentially regulates neuronal activities by suppressing the neuronal network of anesthesia-activated brain regions and activating emergence-activated brain regions. Thus, microglia facilitate and stabilize the anesthesia status. This influence is not mediated by dendritic spine plasticity. Instead, it relies on the activation of microglial P2Y12 and subsequent calcium influx, which facilitates the general anesthesia response. Together, we elucidate the regulatory role of microglia in general anesthesia, extending our knowledge of how nonneuronal cells modulate neuronal activities.
Insights
Microglia, immune cells in the brain, are crucial for maintaining general anesthesia. Depleting microglia disrupts anesthesia by altering brain activity, highlighting their role in consciousness regulation.
Area of Science:
- Neuroscience
- Immunology
- Anesthesiology
Background:
- General anesthesia induces unconsciousness but its mechanisms are not fully understood.
- The role of nonneuronal cells, such as microglia, in anesthesia is unknown.
- Microglia are key immune cells in the central nervous system (CNS), vital for its function and dysfunction.
Purpose of the Study:
- To investigate the role of microglia in the mechanisms of general anesthesia.
- To determine how microglia influence neuronal activity during anesthesia and emergence.
Main Methods:
- Microglia depletion in mice.
- Assessment of anesthesia induction and emergence times.
- Analysis of neuronal activity in anesthesia- and emergence-activated brain regions.
- Investigation of microglial P2Y12 receptor activation and calcium signaling.
Main Results:
- Microglia depletion led to delayed anesthesia induction and faster emergence.
- Microglial depletion altered neuronal network activity in specific brain regions.
- The effect was independent of dendritic spine plasticity.
- Microglial P2Y12 activation and calcium influx were identified as key mediators.
Conclusions:
- Microglia play a significant role in facilitating and stabilizing general anesthesia.
- Microglia modulate neuronal activity to regulate the anesthesia state.
- This study reveals a novel function of microglia in general anesthesia, mediated by P2Y12 signaling.
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