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Related Experiment Video

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Azithromycin Prevents Subglottic Stenosis in Mice.

Daniel D Ghaderi1, Matthew R Aronson1,2, Amrita Mehta1

  • 1Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania, USA.

The Laryngoscope
|September 14, 2024
PubMed
Summary
This summary is machine-generated.

Azithromycin demonstrates potential in treating pediatric subglottic stenosis (SGS) by reducing airway fibrosis and inflammation. This study shows azithromycin prevents pro-fibrotic gene expression and protects mice from developing SGS.

Keywords:
T cellsantibioticsfibroblastspediatric

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Area of Science:

  • Otolaryngology
  • Pulmonology
  • Pharmacology

Background:

  • Pediatric subglottic stenosis (SGS) involves airway narrowing due to pathological fibroblast activity and extracellular matrix deposition.
  • Recent observations suggest azithromycin may reduce SGS, potentially by impacting airway infections and the microbiome.
  • This study investigates azithromycin's therapeutic effects against SGS.

Purpose of the Study:

  • To characterize the immunomodulatory and antibacterial protective effects of azithromycin against subglottic stenosis.
  • To assess azithromycin's impact on fibroblast-mediated extracellular matrix production and myofibroblast differentiation.
  • To evaluate azithromycin's efficacy in a murine model of SGS.

Main Methods:

  • In vitro: Azithromycin's effects on TGF-β1-stimulated fibroblasts were assessed for gene expression (RT-qPCR) and myofibroblast differentiation (α-SMA immunostaining).
  • In vivo: Mice were pretreated with intranasal azithromycin before SGS induction via wire brush injury.
  • Disease severity and immune cell infiltration were analyzed using histology and immunostaining.

Main Results:

  • Azithromycin significantly reduced extracellular matrix and myofibroblast gene expression (COL1A1, LOX, ACTA2) in vitro.
  • α-SMA immunostaining showed decreased myofibroblast differentiation in azithromycin-treated fibroblasts.
  • In vivo, azithromycin treatment led to reduced lamina propria thickness and altered T-cell infiltration, indicating decreased stenosis.

Conclusions:

  • Azithromycin effectively prevents pro-fibrotic gene expression and myofibroblast differentiation.
  • The study demonstrates azithromycin's protective effect against the development of subglottic stenosis in a murine model.
  • Azithromycin is proposed as a potential therapeutic agent for treating pediatric subglottic stenosis.