Comparative Analysis of LPS/IFN-γ and LPS/ATP-Induced Inflammatory Models in BV2 Microglia

Area of Science:

• Neuroinflammation research
• In vitro models of microglial activation
• Immunology and cell biology

Background:

• Accurate in vitro models are crucial for neuroinflammation mechanistic studies and anti-inflammatory drug screening.
• Lipopolysaccharide/interferon-γ (LPS/IFN-γ) and LPS/adenosine triphosphate (LPS/ATP) are common microglial inflammation inducers.
• Systematic comparison of these models' distinct characteristics and optimal applications is lacking.

Purpose of the Study:

• To comparatively analyze the molecular and functional differences between LPS/IFN-γ and LPS/ATP induced microglial inflammation models.
• To establish an empirical framework for selecting appropriate in vitro microglial inflammation models.
• To guide the screening of targeted anti-inflammatory therapeutics and inflammasome inhibitors.

Main Methods:

• Transcriptomic profiling of BV2 microglia stimulated with LPS/IFN-γ or LPS/ATP.
• Functional assays measuring inflammatory mediator production (NO, TNF-α, IL-1β).
• Pharmacological inhibition of NLRP3 inflammasome using MCC950.

Main Results:

• Both models activated chemokine-cytokine networks but showed distinct gene expression profiles and functional outcomes.
• LPS/IFN-γ model upregulated innate immunity and chemokine genes, increasing NO and TNF-α; suitable for classical inflammation studies.
• LPS/ATP model upregulated ECM/cell adhesion and calcium-dependent secretion genes, enhancing IL-1β maturation and mitochondrial dysfunction, implicating NLRP3 inflammasome activation.

Conclusions:

• The LPS/IFN-γ model is optimal for studying the NO/iNOS-TNF-α axis and IFN-γ-mediated responses.
• The LPS/ATP model is more suitable for investigating IL-1β maturation, NLRP3 inflammasome activation, and inflammation-induced cell death.
• This comparative analysis provides a rational basis for selecting microglial inflammation models in research and drug discovery.