Agents that increase AAM differentiation blunt RSV-mediated lung pathology

Kari Ann Shirey, Wendy Lai, Lioubov M. Pletneva, Fred D. Finkelman, David J. Feola, Jorge C.G. Blanco, Stefanie N. Vogel

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


RSV is the most significant cause of serious lower respiratory tract infection in infants and young children worldwide. There is currently no vaccine for the virus, and antiviral therapy (e.g., ribavirin) has shown no efficacy against the disease. We reported that alternatively activated macrophages (AAMs) mediate resolution of RSV-induced pathology. AAM differentiation requires macrophage-derived IL-4 and-13, autocrine/paracrine signaling through the type I IL-4 receptor, and STAT6 activation. Based on these findings, we reasoned that it would be possible to intervene therapeutically in RSV disease by increasing AAM differentiation, thereby decreasing lung pathology. Mice treated with the IL-4/anti-IL-4 immune complexes, shown previously to sustain levels of circulating IL-4, increased the RSVinduced AAM markers arginase-1 and mannose receptor and decreased the lung pathology. Induction of PPARΓ, shown to play a role in AAM development, by the PPARΓagonist rosiglitazone or treatment of mice with the macrolide antibiotic AZM, also reported to skew macrophage differentiation to an AAM phenotype, increased the AAM markers and mitigated RSV-induced lung pathology. Collectively, our data suggest that therapeutic manipulation of macrophage differentiation to enhance the AAM phenotype is a viable approach for ameliorating RSV-induced disease.

Original languageEnglish
Pages (from-to)951-955
Number of pages5
JournalJournal of Leukocyte Biology
Issue number6
StatePublished - Dec 1 2014

Bibliographical note

Publisher Copyright:
© Society for Leukocyte Biology.


  • Azithromycin
  • Macrophage differentiation
  • PPARγ
  • Rosiglitazone

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Cell Biology


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