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Liu, Q. ; Yang, L. ; Li, C. ; Han, L. ; Wilmot, J.* ; Yang, G. ; Leinardi, R.* ; Zhou, Q. ; Schröppel, A. ; Kutschke, D. ; Secklehner, J.* ; Yildirim, A.Ö. ; Huaux, F.* ; Zeuschner, D.* ; Carlin, L.M.* ; Sperandio, M.* ; Schmid, O. ; Stöger, T. ; Rehberg, M.

Alveolar macrophages initiate the spatially targeted recruitment of neutrophils after nanoparticle inhalation.

Sci. Adv. 11:eadx8586 (2025)
Publ. Version/Full Text Research data DOI PMC
Open Access Gold
Creative Commons Lizenzvertrag
Lung resident immune cells are essential for initiating defenses against inhaled air pollutants, including nanoparticles (NPs), which contribute to pulmonary disease progression. Here, lung intravital microscopy was used to examine the pulmonary innate immune responses in mice, during acute aerosol exposure to carbon NPs, a common environmental pollutant, or fluorescent quantum dot NPs. We found that inhaled NPs triggered rapid, neutrophil recruitment, localized to alveolar NP deposition hotspots, orchestrated by alveolar macrophages (AMs) through both their motility and phagocytic activity. AM motility inhibition in the alveoli via intercellular adhesion molecule-1/LFA-1 blockade reduced neutrophil recruitment, as did impaired AM phagocytosis through C5a receptor 1/Fc-γ receptor I inhibition or by stealth NP surfaces. In addition, cellular degranulation inhibition indicated the importance of spatially focused cytokine release in neutrophil recruitment. Collectively, our study elucidates AM-epithelial interactions as a critical key event for NPs triggered neutrophilia, with AM motility and phagocytosis driving recruitment and site-specific immune responses in the alveolar microenvironment.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Fc-gamma Receptors; Air-pollution; Quantum Dots; Leukocyte Adhesion; Immune-response; Cells; Clearance; Innate; Inflammation; Inhibition
ISSN (print) / ISBN 2375-2548
e-ISSN 2375-2548
Journal Science Advances
Quellenangaben Volume: 11, Issue: 45, Pages: , Article Number: eadx8586 Supplement: ,
Publisher American Association for the Advancement of Science (AAAS)
Publishing Place Washington, DC [u.a.]
Reviewing status Peer reviewed
Institute(s) Institute of Lung Health and Immunity (LHI)
Grants European Union's horizon 2020 research and innovation program
European Union under the HORiZON
FRiA/FNRS grant
China Scholarship council fellowship