CXCL12+ dermal fibroblasts promote neutrophil recruitment and host defense by recognition of IL-17

CXCL12+ dermal fibroblasts promote neutrophil recruitment and host defense by recognition of IL-17

2024 | Kellen J. Cavagnero, Fengwu Li, Tatsuya Dokoshi, Teruaki Nakatsuji, Alan M. O'Neill, Carlos Aguilera, Edward Liu, Michael Shia, Olive Osuoji, Tissa Hata, and Richard L. Gallo
The study investigates the role of CXCL12+ dermal fibroblasts in neutrophil recruitment and host defense against *Staphylococcus aureus* (S. aureus) infection. Single-cell RNA sequencing (scRNA-Seq) and network analysis of mouse skin during S. aureus infection revealed that CXCL12+ fibroblast subsets, primarily found in the reticular dermis, play a dominant role in communicating with neutrophils. These fibroblasts express IL-17 signaling and adipocyte lineage markers, detect IL-17 and TNFα, and promote neutrophil recruitment through NFKBIZ-dependent release of CXCR2 ligands and CXCL12. In vitro experiments using 3T3-L1 preadipocyte fibroblasts confirmed that IL-17A and TNFα synergistically activate these fibroblasts, leading to the production of neutrophil chemokines and antimicrobials. In vivo studies in mice lacking IL-17RA specifically in fibroblasts showed reduced neutrophil recruitment and increased S. aureus infection. Similar findings were observed in a psoriasis model, where CXCL12+ fibroblast subsets expressed high levels of neutrophil chemokines. These results highlight the critical role of CXCL12+ dermal fibroblasts in cutaneous neutrophil recruitment and host defense, suggesting that these fibroblasts contribute to both infectious and non-infectious forms of skin inflammation.The study investigates the role of CXCL12+ dermal fibroblasts in neutrophil recruitment and host defense against *Staphylococcus aureus* (S. aureus) infection. Single-cell RNA sequencing (scRNA-Seq) and network analysis of mouse skin during S. aureus infection revealed that CXCL12+ fibroblast subsets, primarily found in the reticular dermis, play a dominant role in communicating with neutrophils. These fibroblasts express IL-17 signaling and adipocyte lineage markers, detect IL-17 and TNFα, and promote neutrophil recruitment through NFKBIZ-dependent release of CXCR2 ligands and CXCL12. In vitro experiments using 3T3-L1 preadipocyte fibroblasts confirmed that IL-17A and TNFα synergistically activate these fibroblasts, leading to the production of neutrophil chemokines and antimicrobials. In vivo studies in mice lacking IL-17RA specifically in fibroblasts showed reduced neutrophil recruitment and increased S. aureus infection. Similar findings were observed in a psoriasis model, where CXCL12+ fibroblast subsets expressed high levels of neutrophil chemokines. These results highlight the critical role of CXCL12+ dermal fibroblasts in cutaneous neutrophil recruitment and host defense, suggesting that these fibroblasts contribute to both infectious and non-infectious forms of skin inflammation.
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