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Related Experiment Video

Updated: Jul 5, 2025

Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation
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Transcriptomic characterization of the human segmental endotoxin challenge model.

Christina Gress1,2, Tobias Litzenburger3, Ramona Schmid3

  • 1Fraunhofer Institute for Toxicology and Experimental Medicine ITEM, Clinical Airway Research, 30625, Hannover, Germany.

Scientific Reports
|January 19, 2024
PubMed
Summary

The lipopolysaccharide (LPS) challenge model in human lungs safely creates airway inflammation, revealing gene expression patterns relevant to major respiratory diseases like COPD and pneumonia.

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Area of Science:

  • Pulmonary immunology
  • Transcriptomics
  • Respiratory disease modeling

Background:

  • Segmental lipopolysaccharide (LPS) instillation via bronchoscopy is a safe method to induce transient airway inflammation in humans.
  • This model is valuable for studying inflammatory mechanisms and drug effects in the lungs.

Purpose of the Study:

  • To characterize the transcriptomic profile of human segmental LPS challenge.
  • To contextualize these findings with major respiratory diseases.

Main Methods:

  • 28 healthy smokers underwent segmental LPS or saline (control) instillation.
  • Bronchoalveolar lavage (BAL) fluid and biopsies were collected pre- and 24-hours post-challenge.
  • Differential gene expression analysis was performed on RNA from BAL cells and biopsy samples.

Main Results:

  • LPS challenge significantly altered gene expression in BAL cells (6316 upregulated, 241 downregulated DEGs) but minimally in biopsies (1 downregulated DEG).
  • Upregulated genes in BAL were associated with inflammatory response and chemokine receptor activity.
  • Key pro-inflammatory pathways, including Wnt, Ras, and JAK-STAT signaling, were activated.

Conclusions:

  • The LPS challenge model accurately reflects aspects of prevalent respiratory diseases, including COPD, asthma, pneumonia, tuberculosis, and lung cancer.
  • The model shows particular similarity to acute exacerbations of COPD (AECOPD) and community-acquired pneumonia.
  • This study provides comprehensive transcriptomic data for the LPS challenge model, highlighting its relevance to respiratory diseases and infection-triggered insults.