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Related Experiment Video

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Specialized proresolving mediator-loaded extracellular vesicles mitigate pulmonary inflammation.

Manjula Karpurapu1, Jiasheng Yan2, Sangwoon Chung1

  • 1Pulmonary, Critical Care and Sleep Medicine, Ohio State University Wexner Medical Center, Davis Heart and Lung Research Institute, Columbus, OH, United States.

American Journal of Respiratory Cell and Molecular Biology
|October 22, 2025
PubMed
Summary

Researchers developed a new method to load extracellular vesicles (EVs) with specialized lipids called resolvins. These engineered EVs (Resolvin-EVs) effectively reduce inflammation and show promise for treating acute lung injury.

Keywords:
extracellular vesiclespulmonary inflammationresolvinsspecialized proresolving mediators

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Area of Science:

  • Biotechnology
  • Synthetic Biology
  • Nanomedicine

Background:

  • Extracellular vesicles (EVs) are recognized for their therapeutic delivery capabilities.
  • The potential of EVs for delivering bioactive lipid mediators is underexplored.
  • Resolvins are crucial pro-resolving lipid mediators with anti-inflammatory properties.

Purpose of the Study:

  • To develop a synthetic biology approach for engineering EVs loaded with resolvins.
  • To investigate the therapeutic efficacy of these resolvin-loaded EVs (Resolvin-EVs) in inflammatory conditions.

Main Methods:

  • Co-expression of resolvin biosynthetic enzymes (COX-2, 5-LOX, 15-LOX) in HEK293T cells using a multigene vector.
  • Loading EVs with Resolvin D and E series mediators by culturing cells with DHA, EPA, and aspirin.
  • Characterization of Resolvin-EVs and assessment of their effects on endothelial cells, macrophages, and in a mouse model of acute lung injury.

Main Results:

  • Successfully generated Resolvin-EVs containing multiple resolvins and precursors.
  • Resolvin-EVs attenuated neutrophil adhesion, preserved endothelial barrier integrity, and suppressed inflammatory cytokine release (IL6, TNFα) in macrophages.
  • EV uptake was essential for Resolvin-EV therapeutic effects; enhanced efferocytosis was observed.
  • In vivo administration of Resolvin-EVs reduced pulmonary inflammation in mice without toxicity.

Conclusions:

  • A novel and scalable platform for producing resolvin-loaded EVs has been established.
  • Resolvin-EVs demonstrate significant therapeutic potential for treating acute lung injury and chronic inflammatory diseases.
  • This approach broadens the application of EVs as drug delivery vehicles for lipid mediators.