Single-cell and spatial transcriptomics reveal a stress-induced EMT-like epithelial subset driving immune activation in silica-injured lung
The mechanism that lung epithelial cells regulate immune responses during chronic injury still remains unclear. Here, we combined single-cell RNA sequencing with spatial transcriptomics to track epithelial dynamics in silica (SiO2)-exposed mouse lungs. By day 56, SiO2 induced significant epithelial...
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2025-06-01
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| Series: | Frontiers in Immunology |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fimmu.2025.1609616/full |
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| Summary: | The mechanism that lung epithelial cells regulate immune responses during chronic injury still remains unclear. Here, we combined single-cell RNA sequencing with spatial transcriptomics to track epithelial dynamics in silica (SiO2)-exposed mouse lungs. By day 56, SiO2 induced significant epithelial proliferation, followed with a distinct C0 subset emerging as the dominant population. C0 cells co-expressed surfactant genes (Sftpc, Scgb3a2), mesenchymal markers (Vim, Mmp12), and pro-inflammatory cytokines (Ccl6, S100a8/a9), reflecting a hybrid phenotype. Spatial and cell-cell interaction analyses showed C0 cells engaging macrophages and neutrophils through SPP1-CD44, APP-CD74, and GRN-MARCO signaling, driving immune recruitment and activation. Pseudotime and CytoTRACE analyses indicated that C0 cells represent a late-stage, low-stemness state with epithelial-mesenchymal transition (EMT)-like features. Taken together, these findings reveal a novel, stress-induced epithelial subset that amplifies immune crosstalk and tissue remodeling, offering new perspectives on silica-induced lung injury. |
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| ISSN: | 1664-3224 |