Highly synchronized cortical circuit dynamics mediate spontaneous pain in mice

Area of Science:

• Neuroscience
• Pain Research
• Cortical Dynamics

Background:

• Cortical neural dynamics are crucial for information processing and are implicated in various neurological conditions.
• Spontaneous pain is a hallmark of neuropathic pain, but its effect on cortical networks remains unclear.

Purpose of the Study:

• To investigate if spontaneous pain induces aberrant states in cortical networks.
• To determine if normalizing these states can alleviate pain.

Main Methods:

• Utilized a mouse model of neuropathic pain exhibiting spontaneous pain-like behavior.
• Employed intravital two-photon calcium imaging to observe neural dynamics in the primary somatosensory cortex (S1).
• Investigated the role of GABAergic interneurons and tested interventions like chemogenetics and clinical pain therapies.

Main Results:

• Orofacial spontaneous pain led to synchronized neural dynamics in S1, associated with GABAergic interneuron hypoactivity.
• Chemogenetic inhibition of pain-related neurons and activation of GABAergic interneurons reduced S1 synchronization.
• Clinically effective pain treatments (carbamazepine, nerve root decompression) also decreased S1 synchronization.
• Attenuating S1 synchronization alleviated pain-like behaviors.

Conclusions:

• Spontaneous pain drives the S1 network into a synchronized state.
• Reversing this synchronization effectively alleviates neuropathic pain-like behaviors.
• Targeting cortical network synchronization offers a potential therapeutic strategy for neuropathic pain.