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“It’s about time”: Tregs win the Nobel prize
Next-generation T cell immunotherapies engineered with CRISPR base and prime editing: challenges and opportunities
Cepharanthine alleviates lipopolysaccharide-induced acute lung injury through modulating macrophage polarization
CAR-T cells drive into progressive multiple sclerosis
Comparative study of seed germinations and phenology of population of the invasive weed Solanum rostratum Dunal in Israel
Lilly’s tirzepatide and Novo Nordisk’s semaglutide vie for top drug spot
Non-financial conflicts of interest
Rapid estimation of protein folding pathways from sequence alone using AlphaFold2
Proteomic and morphologic characterization of ovine macrophage differentiation and polarization
Abstract Macrophages play crucial roles in inflammation and tissue homeostasis, exhibiting phenotypic and functional plasticity that enables them to initiate, sustain, or resolve inflammation. To support the evidence-based selection of biomedically relevant preclinical models, this study comprehensively characterized ovine macrophage differentiation and polarization by integrating morphological assessments with in-depth proteomic profiling of cellular lysates and secretomes. Monocytes isolated from peripheral blood were differentiated into macrophages using GM-CSF (GMØ) or M-CSF (MMØ), then polarized into M1 and M2 phenotypes. Mass spectrometry identified 4804 proteins in cell lysates and 901 in secretomes, including 42 CD antigens, enabling the establishment of CD marker profiles for monocytes and the distinct macrophage differentiation and polarization states. Proteomic analyses revealed significant upregulation of inflammatory markers in M1 and elevated tissue repair markers in M2 macrophages. Enrichment analysis confirmed activation of antimicrobial and matrix-degrading pathways in M1 macrophages, and regenerative, proteolysis-inhibiting functions in M2 macrophages. In conclusion, this study addresses the limitations of currently available immunological tools by providing an antibody-independent alternative for the classification of ovine macrophages, facilitating more precise phenotypic characterization and functional insight in ovine immunology research.