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The Activation of Hippocampal Microglial Cells and Their Role in the Regulation of Pain
1Department of Tuina, School of Acupuncture-Moxibustion and Tuina, Hunan University of Chinese Medicine, 410208 Changsha, Hunan, China.
Abstract:
Chronic pain frequently coexists with adverse emotions, including anxiety and depression, significantly affecting patients' physical and psychological health as well as their quality of life. Changes in hippocampal synaptic architecture, neuronal injury, and diminished neurogenesis significantly contribute to pain-related emotions. Microglia in the hippocampus are implicated in these pathologies. Stimulation or injury leads to microglial activation, which causes pain; prolonged pain causes microglia to continuously release pro-inflammatory factors that induce astrocyte activation, which mediates the apoptosis of hippocampal neurons and abnormal neurogenesis. Concurrently, microglia exhibit aberrant phagocytosis and augmented pruning of hippocampal dendritic spines, which disrupts synaptic plasticity and influences hippocampal long-term potentiation, hence contributing to the emergence of negative emotions. Inflammatory responses in the brain are a prevalent pathological foundation for mood disorders and pain, and the activation or inhibition of microglia M1 polarization can influence pain-related emotions. This review elucidates the significance of hippocampal microglia activation, and their interactions with neurons in the hippocampus and astrocytes, in pain-related emotions.
Insights
Chronic pain and negative emotions like anxiety are linked to changes in the hippocampus. Microglia activation in the hippocampus plays a key role in these pain-related emotional disorders.
Area of Science:
- Neuroscience
- Psychiatry
- Immunology
Background:
- Chronic pain often co-occurs with anxiety and depression, impacting patient well-being.
- Hippocampal alterations, including synaptic changes, neuronal injury, and reduced neurogenesis, are linked to pain-related emotions.
- Microglia, the brain's immune cells, are increasingly recognized for their role in these conditions.
Purpose of the Study:
- To review the role of hippocampal microglia activation in the development of pain-related emotions.
- To explore the interactions between microglia, neurons, and astrocytes in the context of chronic pain and mood disorders.
Main Methods:
- Literature review focusing on the pathological mechanisms linking chronic pain, hippocampal function, and emotional disturbances.
- Analysis of studies investigating microglial activation states (e.g., M1 polarization) and their impact on neuronal and synaptic integrity.
- Examination of the role of neuroinflammation and glial cell interactions in pain-related emotional comorbidities.
Main Results:
- Microglial activation in the hippocampus contributes to pain-related emotional dysfunction.
- Prolonged pain induces sustained microglial activation, leading to pro-inflammatory factor release and astrocyte activation.
- This cascade results in hippocampal neuronal apoptosis, impaired neurogenesis, and disrupted synaptic plasticity, exacerbating negative emotions.
Conclusions:
- Hippocampal microglia activation is a significant factor in the pathophysiology of pain-related emotions.
- The interplay between microglia, neurons, and astrocytes in the hippocampus is crucial for understanding and potentially treating mood disorders associated with chronic pain.
- Targeting microglial activation pathways may offer therapeutic strategies for comorbid pain and emotional conditions.
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