miR-92a-3p regulates neuropathic pain and neuroinflammation by regulating the expression of WNT5A

Area of Science:

• Neuroscience
• Molecular Biology
• Immunology

Background:

• Neuropathic pain (NP) is a debilitating condition often associated with neuroinflammation.
• MicroRNAs (miRNAs) play crucial roles in regulating cellular processes, including inflammation and pain signaling.
• The specific role of miR-92a-3p in NP and its interaction with Wnt5a warrants further investigation.

Purpose of the Study:

• To elucidate the mechanism by which miR-92a-3p influences neuropathic pain and neuroinflammation.
• To investigate the regulatory relationship between miR-92a-3p and Wnt5a in the context of NP.
• To determine the therapeutic potential of modulating miR-92a-3p in NP.

Main Methods:

• Established a cellular model using lipopolysaccharide (LPS)-stimulated rat microglia (HAPI cells).
• Induced neuropathic pain in rats using chronic constriction injury (CCI) surgery.
• Assessed pain behaviors (PWT, PWL), miRNA and Wnt5a expression (RT-qPCR), and inflammatory cytokines (ELISA).
• Verified the targeting relationship between miR-92a-3p and Wnt5a using a dual-luciferase reporter assay.

Main Results:

• LPS stimulation decreased miR-92a-3p and anti-inflammatory cytokines (IL-4, IL-10) while increasing pro-inflammatory cytokines (TNF-α, IL-1β, IL-6, IFN-γ) in microglia.
• Wnt5a was identified as a target gene of miR-92a-3p, and its expression was inversely correlated with miR-92a-3p levels.
• CCI rats exhibited low miR-92a-3p and high Wnt5a expression, correlating with reduced pain thresholds and elevated inflammation.
• Modulating miR-92a-3p and Wnt5a levels in vivo significantly altered pain responses and inflammatory markers.

Conclusions:

• Reduced miR-92a-3p expression contributes to neuropathic pain by upregulating Wnt5a.
• Wnt5a promotes the release of inflammatory factors, exacerbating NP.
• miR-92a-3p acts as a negative regulator of Wnt5a, suggesting its potential as a therapeutic target for NP.