In:
Frontiers in Immunology, Frontiers Media SA, Vol. 15 ( 2024-3-27)
Abstract:
A mouse model of irradiation (IR)-induced heart injury was established to investigate the early changes in cardiac function after radiation and the role of cardiac macrophages in this process. Methods Cardiac function was evaluated by heart-to-tibia ratio, lung-to-heart ratio and echocardiography. Immunofluorescence staining and flow cytometry analysis were used to evaluate the changes of macrophages in the heart. Immune cells from heart tissues were sorted by magnetic beads for single-cell RNA sequencing, and the subsets of macrophages were identified and analyzed. Trajectory analysis was used to explore the differentiation relationship of each macrophage subset. The differentially expressed genes (DEGs) were compared, and the related enriched pathways were identified. Single-cell regulatory network inference and clustering (SCENIC) analysis was performed to identify the potential transcription factors (TFs) which participated in this process. Results Cardiac function temporarily decreased on Day 7 and returned to normal level on Day 35, accompanied by macrophages decreased and increased respectively. Then, we identified 7 clusters of macrophages by single-cell RNA sequencing and found two kinds of stage specific macrophages: senescence-associated macrophage (Cdkn1a high C5ar1 high ) on Day 7 and interferon-associated macrophage (Ccr2 high Isg15 high ) on Day 35. Moreover, we observed cardiac macrophages polarized over these two-time points based on M1/M2 and CCR2/major histocompatibility complex II (MHCII) expression. Finally, Kyoto Encyclopedia of Genes and Genomes (KEGG) and Gene Ontology (GO) enrichment analyses suggested that macrophages on Day 7 were characterized by an inflammatory senescent phenotype with enhanced chemotaxis and inflammatory factors, while macrophages on Day 35 showed enhanced phagocytosis with reduced inflammation, which was associated with interferon-related pathways. SCENIC analysis showed AP-1 family members were associated with IR-induced macrophages changes. Conclusion We are the first study to characterize the diversity, features, and evolution of macrophages during the early stages in an IR-induced cardiac injury animal model.
Type of Medium:
Online Resource
ISSN:
1664-3224
DOI:
10.3389/fimmu.2024.1363278
DOI:
10.3389/fimmu.2024.1363278.s001
DOI:
10.3389/fimmu.2024.1363278.s002
DOI:
10.3389/fimmu.2024.1363278.s003
DOI:
10.3389/fimmu.2024.1363278.s004
DOI:
10.3389/fimmu.2024.1363278.s005
DOI:
10.3389/fimmu.2024.1363278.s006
DOI:
10.3389/fimmu.2024.1363278.s007
DOI:
10.3389/fimmu.2024.1363278.s008
DOI:
10.3389/fimmu.2024.1363278.s009
DOI:
10.3389/fimmu.2024.1363278.s010
Language:
Unknown
Publisher:
Frontiers Media SA
Publication Date:
2024
detail.hit.zdb_id:
2606827-8
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