ArticleFrontiers in immunology2025
Ovine macrophage identity and plasticity: novel insights into CSF-driven polarization and species-specific responses.
Article in Frontiers in immunology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
Macrophages (MØs) are pivotal immune cells exhibiting significant plasticity that has been widely studied in human and murine models. Granulocyte-macrophage colony-stimulating factor (GM-CSF) and macrophage colony-stimulating factor (M-CSF) are key regulators of macrophage differentiation from monocytes. In this study, we comprehensively investigated the immunophenotypic, functional, and transcriptomic profiles of ovine MØs differentiated with GM-CSF (GM-oMØs) or M-CSF (M-oMØs) to provide a more nuanced understanding of their activation states. After 7 days, GM-oMØs displayed a smaller, more varied morphology with lower cell yields compared to the larger, uniformly amoeboid M-oMØs. Immunophenotypically, M-oMØs showed significantly higher CD163 expression, consistent with human M-MØs, while CLEC5A was uninformative for differentiation. Transcriptomic analysis, complemented by qPCR and ELISA, revealed clearly distinct profiles, with GM-oMØs exhibiting a pronounced pro-inflammatory phenotype and showing significantly higher expression of 408 genes, mostly associated with interferon and inflammatory response pathways, a feature that aligns with the functional and phenotypic characteristics of human and mouse GM-MØ. Conversely, M-oMØs displayed a regulatory and anti-inflammatory profile, marked by a significantly higher expression of IL-10 and a set of 248 genes involved in cellular homeostasis. Notably, LPS stimulation dramatically shifted the M-oMØ phenotype toward a pro-inflammatory state, unequivocally demonstrating their substantial plasticity, and mirroring human M-CSF-polarized monocytes. Our findings fundamentally challenge the prevailing M1/M2 simplification in ovine macrophage biology and provide a robust foundation for selecting appropriate
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