Central Sensitization-Related Changes in Brain Function Activity in a Rat Endometriosis-Associated Pain Model

Area of Science:

• Neuroscience
• Pain Research
• Animal Models

Background:

• Central nervous system (CNS) pain sensitization is implicated in endometriosis-associated pain.
• Understanding central mechanisms is crucial for managing endometriosis pain.

Purpose of the Study:

• To investigate alterations in brain activity related to abnormal pain responses in endometriosis.
• To explore the central sensitization mechanisms underlying endometriosis-associated pain.

Main Methods:

• Established an endometriosis rat model (n=40) with a sham control group (n=20).
• Utilized resting-state functional magnetic resonance imaging (Rs-fMRI) and regional homogeneity (ReHo) analysis.
• Examined neuronal states and expression of TRPV1 and NMDRA via Nissl staining, qRT-PCR, and immunohistochemistry.

Main Results:

• Rs-fMRI revealed enhanced ReHo signals in the anterior cingulate cortex, hippocampus, and thalamus in pain rats.
• Reduced ReHo signals were observed in the basomedial amygdaloid nucleus and primary motor cortex.
• Increased apoptotic neurons and compensatory neuronal volume increases were noted in specific brain regions, with TRPV1 and NMDRA overexpression.

Conclusions:

• Endometriosis-associated pain in rats is associated with enhanced ReHo signals in the cingulate cortex, thalamus, and hippocampus.
• These changes may stem from increased apoptosis or compensatory overactivity of neurons.
• Findings highlight the role of central sensitization in endometriosis pain pathophysiology.