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Knockdown of PAC1 improved inflammatory pain in mice by regulating the RAGE/TLR4/NF-κB signaling pathway

Xia Zhao1, Nan Wang2, Zhe Li3

  • 1Department of Vascular Intervention, Ninth Hospital of Xi'an, Xi'an, Shaanxi 710054, China.

Brain Research Bulletin
|March 26, 2023
PubMed

Insights

Targeting PAC1, a protein highly expressed in microglia during inflammation, can alleviate inflammatory pain. Reducing PAC1 levels inhibits key inflammatory pathways, offering a potential new treatment strategy for pain relief.

Area of Science:

  • Neuroscience
  • Immunology
  • Pharmacology

Background:

  • Inflammatory pain significantly impairs daily life, yet mechanisms for pain relief remain underexplored.
  • Understanding the molecular underpinnings of inflammatory pain is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the role of PAC1 in the progression of inflammatory pain.
  • To elucidate the molecular mechanisms by which PAC1 influences inflammatory pain.

Main Methods:

  • Established an inflammation model using lipopolysaccharide (LPS) to activate BV2 microglia.
  • Induced inflammatory pain in mice using Complete Freund's Adjuvant (CFA) injection.
  • Assessed the effects of PAC1 knockdown on inflammatory responses, apoptosis, and pain behaviors in vitro and in vivo.

Main Results:

  • PAC1 expression was elevated in LPS-induced BV2 microglia.
  • Knockdown of PAC1 reduced LPS-induced inflammation and apoptosis in BV2 cells.
  • PAC1 knockdown alleviated CFA-induced mechanical allodynia and thermal hyperalgesia in mice.
  • PAC1 regulates BV2 cells via the RAGE/TLR4/NF-κB signaling pathway.

Conclusions:

  • Knockdown of PAC1 alleviates inflammatory pain in mice by inhibiting the RAGE/TLR4/NF-κB signaling pathway.
  • Targeting PAC1 presents a promising new therapeutic strategy for managing inflammatory pain.
Keywords:
Inflammatory painPAC1RAGE/TLR4/NF-κB axis

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