Abstract
Vascular inflammation and endothelial dysfunction contribute to vascular diseases. While neutrophil extracellular traps (NETs) participate in some vascular pathologies, their roles in lower limb ischemia remain poorly defined. This study investigated the functional significance of NETs in vascular inflammation and remodeling associated with limb ischemia. Single-cell RNA sequencing (scRNA-seq) and flow cytometry revealed neutrophil activation and upregulated NETs formation in human limb ischemia, with immunofluorescence confirming IL-1β-induced release of NETs for vascular inflammation. Endothelial cell activation was examined via scRNA-seq and western blotting, indicating enhanced proliferation, expression of adhesion molecules (VCAM-1, ICAM-1), inflammatory cytokines (IL-1β, IL-6) and decreased expression of VE-cadherin, that could be mediated by NETs to exacerbate endothelial inflammation. Mechanistically, NETs altered endothelial cell function via increased pSTAT1/STAT1 signaling. Vascular inflammation and subsequent ischemia were alleviated in vivo by NETosis or IL-1β inhibition in ischemic mice. IL-1β-NETs induce endothelial activation and inflammation in limb ischemia by stimulating STAT1 signaling. Targeting NETs may thus represent a novel therapeutic strategy for inflammatory vascular diseases associated with limb ischemia.
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Acknowledgements
We appreciate for the technical support by the Core Facilities, Central Laboratory, the First Affiliated Hospital, Zhejiang University School of Medicine.
Funding
This work was supported by the National Natural Science Foundation of China (82370496, 81700420, 32300945) and the Zhejiang Provincial Natural Science Foundation of China under Grant No. LQ23H020006.
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HZ and YH conceived and designed the study. SL, PZ and LJ performed the experiments. YH and LH established the model of hind limb ischemic. PZ and LJ analyzed the data. SL wrote the manuscript.
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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Research Ethics Committee of the First Afliated Hospital of Zhejiang University School of Medicine (approval No. 2020/98).
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Lin, S., Zhu, P., Jiang, L. et al. Neutrophil extracellular traps induced by IL-1β promote endothelial dysfunction and aggravate limb ischemia. Hypertens Res (2024). https://doi.org/10.1038/s41440-024-01661-3
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DOI: https://doi.org/10.1038/s41440-024-01661-3