Macrophage-derived LTB4promotes abscess formation and clearance of Staphylococcus aureus skin infection in mice

Stephanie L. Brandt, Nathan Klopfenstein, Soujuan Wang, Seth Winfree, Brian P. McCarthy, Paul R. Territo, Lloyd Miller, C. Henrique Serezani

Research output: Contribution to journalArticle

Abstract

The early events that shape the innate immune response to restrain pathogens during skin infections remain elusive. Methicillin-resistant Staphylococcus aureus (MRSA) infection engages phagocyte chemotaxis, abscess formation, and microbial clearance. Upon infection, neutrophils and monocytes find a gradient of chemoattractants that influence both phagocyte direction and microbial clearance. The bioactive lipid leukotriene B4(LTB4) is quickly (seconds to minutes) produced by 5-lipoxygenase (5-LO) and signals through the G protein-coupled receptors LTB4R1 (BLT1) or BLT2 in phagocytes and structural cells. Although it is known that LTB4enhances antimicrobial effector functions in vitro, whether prompt LTB4production is required for bacterial clearance and development of an inflammatory milieu necessary for abscess formation to restrain pathogen dissemination is unknown. We found that LTB4is produced in areas near the abscess and BLT1 deficient mice are unable to form an abscess, elicit neutrophil chemotaxis, generation of neutrophil and monocyte chemokines, as well as reactive oxygen species-dependent bacterial clearance. We also found that an ointment containing LTB4synergizes with antibiotics to eliminate MRSA potently. Here, we uncovered a heretofore unknown role of macrophage-derived LTB4in orchestrating the chemoattractant gradient required for abscess formation, while amplifying antimicrobial effector functions.

Original languageEnglish (US)
Article numbere1007244
JournalPLoS pathogens
Volume14
Issue number8
DOIs
StatePublished - Aug 2018

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ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Immunology
  • Molecular Biology
  • Genetics
  • Virology

Cite this

Brandt, S. L., Klopfenstein, N., Wang, S., Winfree, S., McCarthy, B. P., Territo, P. R., Miller, L., & Serezani, C. H. (2018). Macrophage-derived LTB4promotes abscess formation and clearance of Staphylococcus aureus skin infection in mice. PLoS pathogens, 14(8), [e1007244]. https://doi.org/10.1371/journal.ppat.1007244