Oxycodone ameliorates the inflammatory response induced by lipopolysaccharide in primary microglia

Area of Science:

• Neuroscience
• Pharmacology
• Immunology

Background:

• Microglial activation is implicated in central nervous system disorders.
• Oxycodone has shown potential in inhibiting glial cell overactivation in rat spinal cords.
• Investigating oxycodone's effects on inflammatory responses in primary microglia is crucial.

Purpose of the Study:

• To examine the impact of oxycodone on inflammatory molecules and signaling pathways in lipopolysaccharide (LPS)-stimulated primary microglia.
• To determine the effective concentration of oxycodone in modulating microglial activation.

Main Methods:

• Primary microglia from neonatal rats were stimulated with LPS.
• Cells were treated with varying concentrations of oxycodone (25, 50, 100 ng/mL).
• Levels of IL-1β, TNF-α, and TGF-β1/smad2/3 pathway components were measured; microglial activation and TβR1 expression were assessed via immunofluorescence.

Main Results:

• Oxycodone at 25 ng/mL had no significant effect on LPS-induced inflammation.
• Oxycodone at 50 and 100 ng/mL significantly reduced LPS-induced TNF-α and IL-1β production.
• Higher oxycodone concentrations suppressed the TGF-β1/smad2/3 signaling pathway and associated mRNA expression.

Conclusions:

• Oxycodone, at clinically relevant concentrations (50 and 100 ng/mL), inhibits inflammatory responses in LPS-induced primary microglia.
• These findings suggest oxycodone's potential as an anti-inflammatory agent in neuroinflammatory conditions.
• Further research is needed to elucidate the precise mechanisms underlying oxycodone's anti-inflammatory effects.