M1 Macrophage Phenotype
M1 Macrophage Phenotype - Related Videos
07:45
Metabolic Characterization of Polarized M1 and M2 Bone Marrow-derived Macrophages Using Real-time Extracellular Flux Analysis
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Cited by 275 •
2015
Metabolic reprogramming is a characteristic and prerequisite for M1 and M2 macrophage polarization. This manuscript describes an assay for the measurement of fundamental parameters of glycolysis and mitochondrial function in mouse bone marrow-derived macrophages. This tool can be applied to investigate how particular factors affect the macrophage’s metabolism and phenotype.
03:05
In Vitro Culture and Differentiation of Primary Monocytes into Macrophages
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2025
This video demonstrates the priming of primary monocytes into macrophages. Primary human monocytes can be isolated and differentiated to an M1-like pro-inflammatory phenotype using the granulocyte-macrophage colony-stimulating factor (GM-CSF) or to an M2-like anti-inflammatory phenotype using the macrophage colony-stimulating factor (M-CSF).
10:07
Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages
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Cited by 326 •
2013
The article describes a readily easy adaptive in vitro model to investigate macrophage polarization. In the presence of GM-CSF/M-CSF, hematopoietic stem/progenitor cells from the bone marrow are directed into monocytic differentiation, followed by M1 or M2 stimulation. The activation status can be tracked by changes in cell surface antigens, gene expression and cell signaling pathways.
07:14
Phenotypic Characterization of Macrophages from Rat Kidney by Flow Cytometry
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Cited by 37 •
2016
This manuscript describes a detailed protocol for phenotypic and quantitative analysis of resident macrophages from rat kidneys by flow cytometry. The resulting stained cells can be also used for other applications, including cell sorting, gene expression analysis or functional studies, thus increasing the information obtained in the experimental model.
08:50
Depletion and Reconstitution of Macrophages in Mice
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Cited by 118 •
2012
Macrophages play a central role in homeostasis and pathology in many tissues. The protocol presented here describes methods for depleting macrophages in vivo, deriving polarized macrophages from bone marrow aspirates, and adoptively transferring macrophages into mice. These techniques allow determination of the role that polarized macrophages play in health and disease.
FAQs
These signals act through pattern-recognition and cytokine-signaling pathways that alter macrophage gene expression. Lipopolysaccharide provides a microbial signal, while interferon-γ supplies an immune cytokine signal; together, they promote the transcriptional program associated with inflammatory mediator production. This combined activation helps connect pathogen detection with early immune responses.
A stimulated macrophage population may produce tumor necrosis factor, interleukin-1β, interleukin-6, reactive oxygen species, and nitric oxide. These products provide experimentally useful indicators of inflammatory activation while also reflecting different aspects of host defense. Their presence helps researchers examine how macrophages contribute to pathogen restriction, inflammatory signaling, and recruitment of additional immune cells.
Short-term inflammatory activation can support early host defense, but persistent or excessive activation may contribute to tissue injury and chronic inflammatory disease. This contrast makes the phenotype important for studying immune balance: the same inflammatory program that helps respond to infection can become harmful when it remains strong or continues beyond the immediate defensive need.
A basic experimental model can expose macrophages to lipopolysaccharide together with interferon-γ, the activating signals described for this state. Researchers can then examine changes in inflammatory gene expression and production of tumor necrosis factor, interleukin-1β, interleukin-6, reactive oxygen species, or nitric oxide. These measurements connect the applied stimulus with macrophage function.
Studying the M1 macrophage phenotype can reveal how macrophages respond after recognizing microbial signals and receiving inflammatory cytokine input. The resulting mediator profile helps investigators evaluate potential contributions to pathogen restriction, inflammatory amplification, and immune-cell recruitment. In infection studies, these outcomes connect macrophage activation with broader changes in host defense.
This research highlights macrophage plasticity, meaning that macrophage behavior can shift according to activating conditions and immune context. Investigating sustained inflammatory activation helps explain how protective responses may become associated with tissue injury or chronic inflammatory disease. The topic therefore links infection biology with questions about when inflammation remains beneficial and when it becomes damaging.