Intracellular Staphylococcus aureus triggers pyroptosis and contributes to inhibition of healing due to perforin-2 suppression

Irena Pastar, Andrew P. Sawaya, Jelena Marjanovic, Jamie L. Burgess, Natasa Strbo, Katelyn E. Rivas, Tongyu C. Wikramanayake, Cheyanne R. Head, Rivka C. Stone, Ivan Jozic, Olivera Stojadinovic, Eran Y. Kornfeld, Robert S. Kirsner, Hadar Lev-Tov, Marjana Tomic-Canic

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Impaired wound healing associated with recurrent Staphylococcus aureus infection and unresolved inflammation are hallmarks of nonhealing diabetic foot ulcers (DFUs). Perforin-2, an innate immunity molecule against intracellular bacteria, limits cutaneous infection and dissemination of S. aureus in mice. Here, we report the intracellular accumulation of S. aureus in the epidermis of DFUs with no clinical signs of infection due to marked suppression of perforin-2. S. aureus residing within the epidermis of DFUs triggers AIM2 inflammasome activation and pyroptosis. These findings were corroborated in mice lacking perforin-2. The effects of pyroptosis on DFU clinical outcomes were further elucidated in a 4-week longitudinal clinical study in patients with DFUs receiving standard care. Increased AIM2 inflammasome and ASC-pyroptosome coupled with induction of IL-1β were found in nonhealing DFUs compared with healing DFUs. Our findings revealed that perforin-2 suppression, intracellular S. aureus accumulation, and associated induction of pyroptosis contribute to healing inhibition and prolonged inflammation in patients with DFUs.

Original languageEnglish (US)
Article numbere133727
JournalJournal of Clinical Investigation
Volume131
Issue number24
DOIs
StatePublished - Dec 1 2021

ASJC Scopus subject areas

  • Medicine(all)

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