Single-Cell Transcriptomics Reveals Stem Cell-Derived Exosomes Attenuate Inflammatory Gene Expression in Pulmonary...

Area of Science:

• Pulmonary Medicine
• Regenerative Medicine
• Cellular Biology

Background:

• Exosomes are implicated in lung disease, reducing inflammation and fibrosis.
• The role of exosomes in pulmonary oxygen toxicity (POT) and their mechanisms remain unclear.
• Investigating exosome therapy for POT is crucial for understanding lung injury.

Purpose of the Study:

• To investigate the protective mechanism of stem cell exosomes in lung tissue against POT.
• To identify the molecular regulatory network involved in exosome-mediated protection.
• To elucidate cellular and molecular mechanisms of exosome therapy for POT using single-cell RNA sequencing.

Main Methods:

• Employed single-cell RNA sequencing (scRNA-seq) and bulk analysis.
• Utilized a mouse model of pulmonary oxygen toxicity (POT).
• Analyzed changes in lung cellular composition and gene expression post-exosome treatment.

Main Results:

• Exosome treatment reduced inflammatory lymphoid cells (NK, B, CD8+, CD4+ T cells) and restored alveolar epithelial cells (AT1/AT2).
• Inflammatory pathways linked to oxidative stress were significantly upregulated in POT.
• Intercellular signal transduction was reduced in the POT group compared to the exosome-treated group.

Conclusions:

• Mesenchymal stem cell exosomes (MSC-Exos) demonstrate protective effects against pulmonary oxygen toxicity.
• scRNA-seq revealed dynamic shifts in lung cellular heterogeneity and identified key molecular pathways.
• Findings provide insights into exosome therapy's mechanism and offer potential therapeutic strategies for lung injury.