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The protective effects of β-caryophyllene on LPS-induced primary microglia M1/M2 imbalance: A mechanistic evaluation

Vahid Reza Askari1, Reza Shafiee-Nick1

  • 1Pharmacological Research Center of Medicinal Plants, Mashhad University of Medical Sciences, Mashhad, Iran; Student Research Committee, Department of Pharmacology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.

Life Sciences
|January 9, 2019
PubMed
Abstract

Insights

Beta-caryophyllene (BCP) shows anti-inflammatory effects in microglia cells, crucial for neurodegenerative diseases like MS and AD. Low BCP concentrations are more effective, modulating microglia to combat neuroinflammation.

Area of Science:

  • Neuroscience
  • Immunology
  • Pharmacology

Background:

  • Neuroinflammation is a key feature of neurodegenerative disorders including Alzheimer's disease (AD) and multiple sclerosis (MS).
  • The CB2 receptor plays a role in both immune and neural modulation.
  • Beta-caryophyllene (BCP) is a selective CB2 receptor agonist known for anti-inflammatory and antioxidant properties.

Purpose of the Study:

  • To investigate the protective effects of BCP on lipopolysaccharide (LPS)-induced inflammation and M1/M2 imbalance in primary microglia.
  • To identify the signaling pathways involved in BCP's effects, including CB2, PPAR-γ, and sphingomyelinase (SMase).

Main Methods:

  • Primary microglia cells were treated with varying concentrations of BCP.
  • LPS was used to induce inflammation and M1/M2 imbalance.
  • Pharmacological antagonists for CB2, PPAR-γ, and SMase were employed to elucidate signaling pathways.

Main Results:

  • BCP treatment promoted an M2 microglia phenotype, reducing inflammatory markers (IL-1β, TNF-α, PGE2, iNOS, NO) and oxidative stress (ROS).
  • BCP increased anti-inflammatory (IL-10, Arg-1, urea) and antioxidant (GSH) markers.
  • CB2 receptor activation mediated BCP's effects, while SMase-induced ceramide production at higher BCP concentrations impaired its protective activity and activated the PPAR-γ pathway.

Conclusions:

  • Low concentrations of BCP exhibit more selective anti-inflammatory effects compared to high concentrations.
  • BCP modulates microglia activity, suggesting potential therapeutic applications for neuroinflammatory conditions like MS and AD.
Keywords:
CannabinoidCaryophylleneInflammationMicrogliaPPAR-γSphingomyelinase

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