Subtype-Specific Roles of Anterior Cingulate Cortex Neurons in Pain-Induced Social Deficits in Mice.

Area of Science:

• Neuroscience
• Pain Research
• Social Behavior Studies

Background:

• Pain often leads to social behavior impairments, but the underlying neural mechanisms are not fully understood.
• The anterior cingulate cortex (ACC) plays a role in pain processing and social cognition.

Purpose of the Study:

• To investigate the specific roles of GABAergic and CaMKII+ neurons in the ACC in mediating social deficits associated with chronic pain.
• To understand how these neuronal subtypes contribute to the comorbidity of pain and social dysfunction.

Main Methods:

• Utilized mouse models of inflammatory and neuropathic pain.
• Employed optogenetics, chemogenetics, and fiber photometry to manipulate and monitor ACC neuronal activity.
• Assessed social behaviors using the three-chamber social interaction test and pain sensitivity via established behavioral assays.

Main Results:

• Mice with chronic pain showed reduced social preference and novelty.
• ACC GABAergic neuron activity decreased, while CaMKII+ neuron activity increased during social interaction in pain models.
• Selective manipulation revealed that GABAergic neurons primarily influence pain hypersensitivity, whereas CaMKII+ neurons impact social preference; distinct interneuron subtypes (PV+ and SST+) differentially regulate social behaviors.

Conclusions:

• Specific ACC neuronal subtypes differentially regulate pain and social behaviors, indicating a functional conflict within the ACC.
• Simultaneous amelioration of both pain and social deficits by modulating a single neuronal population is not feasible.
• Circuit- and subtype-specific interventions are necessary for effectively targeting pain-related social deficits.