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Single-Cell Transcriptome Analysis of Radiation Pneumonitis Mice
Miaomiao Yang1,2,3, Qiang Fan1,2, Tom K Hei4
1Anhui Province Key Laboratory of Medical Physics and Technology/Institute of Health and Medical Technology, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China.
Antioxidants (Basel, Switzerland)
|July 27, 2022
Summary
Radiation pneumonitis (RP) involves cell changes in the lungs. Single-cell analysis reveals fewer alveolar cells and altered macrophages, suggesting new therapeutic targets for radiation-induced lung injury (RILI).
Area of Science:
- Pulmonary Medicine
- Immunology
- Molecular Biology
Background:
- Thoracic radiotherapy for cancer can cause radiation-induced lung injury (RILI), specifically radiation pneumonitis (RP).
- The precise cellular mechanisms driving RP remain poorly understood.
- Identifying specific cell subtypes involved is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the cellular and molecular changes in radiation pneumonitis using single-cell RNA sequencing.
- To identify specific cell subtypes and pathways contributing to RILI pathogenesis.
- To uncover determinants of lung fibrosis and inflammation in RP.
Main Methods:
- Unbiased single-cell RNA sequencing (scRNA-seq) was performed on a mouse model of radiation pneumonitis.
- Differential gene expression analysis was used to identify cell type-specific alterations.
- Pathway enrichment analysis was conducted to identify key signaling cascades.
Main Results:
- A significant decline in type 2 alveolar cells (AT2) was observed in RP lung tissue.
- Macrophages showed altered populations, with expansion of a Fabp4low/Spp1high subgroup and depletion of Fabp4high macrophages.
- Elevated mitochondrial gene expression in AT2 cells suggested oxidative stress, and enrichment of the cGAS-STING pathway was noted.
Conclusions:
- Single-cell analysis reveals distinct cellular shifts, including AT2 cell dysfunction and macrophage polarization, in radiation pneumonitis.
- The cGAS-STING pathway and oxidative stress response in AT2 cells are potential contributors to RP.
- These findings provide a cellular and molecular basis for understanding RILI and developing future treatments.
