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Phospholipids in liposomes significantly alter macrophage gene expression and cell function. Palmitoyl oleoyl phosphatidylcholine (POPC) liposomes activate inflammatory pathways and recruit neutrophils, revealing phospholipids

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Area of Science:

  • Cell Biology
  • Immunology
  • Biochemistry

Background:

  • Phospholipids are fundamental to cellular membranes and vesicles like exosomes.
  • Artificial lipid nanoparticles utilize phospholipids for cargo encapsulation and delivery.
  • The impact of vesicle phospholipids on cellular physiology is often underestimated.

Purpose of the Study:

  • To investigate the physiological effects of phospholipids within liposomes on cellular function.
  • To determine how palmitoyl oleoyl phosphatidylcholine (POPC) liposomes alter macrophage gene expression and pathways.

Main Methods:

  • In vivo and in vitro exposure of macrophages to POPC liposomes.
  • Differential gene expression analysis (transcriptomics).
  • Signaling pathway impact analysis.
  • Proteomic analysis using mass spectrometry.
  • Flow cytometry for neutrophil recruitment assessment.

Main Results:

  • POPC liposomes induced significant changes in 1598 genes in macrophages.
  • Activation of inflammatory pathways, including NF-κB, with increased cytokine and chemokine expression.
  • Proteomic analysis revealed altered protein expression, notably impacting neutrophil degranulation.
  • Rapid neutrophil recruitment to the peritoneal cavity observed post-POPC liposome exposure.

Conclusions:

  • Phospholipids within vesicles, specifically POPC, can profoundly modulate cellular functions.
  • POPC liposomes trigger significant transcriptomic and proteomic alterations in macrophages.
  • These findings highlight the critical role of vesicle composition in cellular responses and inflammation.