Macrophage Recruitment
Macrophage Recruitment - Related Videos
10:02
An Ectopic Chemokine Expression Model for Testing Macrophage Recruitment In Vivo
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2019
To test the effect of a chemokine on macrophage recruitment in vivo, the whole mount in situ hybridization was used to detect the ectopic expression of the chemokine, and immunostaining was used to label macrophages. Live imaging was used for real-time observation of macrophage migration.
03:06
An In Vitro Technique to Study Inflammasome Complex Formation in Macrophages
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2025
This video demonstrates a technique to study NOD-like receptor family pyrin domain-containing 3 (NLRP3) inflammasome formation in primary macrophages via immunofluorescence. The macrophages are first primed with bacterial lipopolysaccharide (LPS) to upregulate NLRP3 protein expression. Exposing the macrophages to nigericin—a potassium ionophore—leads to the activation of NLRP3 and the formation of inflammasomes, which are visualized via immunofluorescence.
05:52
An In Vitro Flow Investigation of the Effect of Stromal Cells on Leukocyte Recruitment
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2025
The video demonstrates a method for investigating the impact of stromal cells on leukocyte recruitment. In a parallel plate flow chamber model, pro-inflammatory cytokines induce the expression of adhesion receptors by endothelial cells, facilitating neutrophil recruitment and migration. The cross-talk between stromal cells and endothelial cells diminishes neutrophil recruitment to the endothelial cells.
04:01
Assessment of the Activation of Multiple Caspases in Macrophages
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2025
This video demonstrates the assessment of multiple caspase activations in bone marrow-derived macrophages through stimulation with the influenza virus. Following macrophage lysis, heat-inactivation of lysate, and centrifugation, intracellular caspases are collected for subsequent immunological analysis.
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.
FAQs
Chemokines and cytokines create concentration gradients that provide directional information for macrophage chemotaxis, the movement of cells toward stronger inflammatory signals. This guidance helps recruited cells localize to damaged, infected, or diseased tissue rather than distributing randomly. The resulting localization positions macrophages where pathogen clearance, debris removal, or tissue repair may be needed.
Adhesion molecules support the transition from circulating cells to tissue-resident responders. They help macrophages or their circulating precursors attach to the vascular endothelium and cross that barrier before entering affected tissue. Without this attachment and passage step, inflammatory signals alone would not efficiently position these cells at sites requiring immune activity or repair.
Macrophage recruitment can support useful inflammation when it enables pathogen clearance, debris removal, and tissue repair. However, excessive or prolonged recruitment may sustain harmful immune activity instead of allowing inflammation to resolve. This imbalance is relevant to chronic inflammatory disease and tumor progression, where continued macrophage presence can shape an unfavorable local tissue environment.
Researchers should examine inflammatory chemokines and cytokines, because their concentration gradients help direct chemotaxis. Adhesion molecules also provide important information by regulating attachment to and passage across the vascular endothelium. Studying these signals together can clarify how recruitment is controlled and may help identify biomarkers associated with tissue damage, infection, disease, or unresolved inflammation.
The process is clinically relevant whenever tissue damage, infection, or disease requires coordinated immune activity. Recruited macrophages can participate in pathogen clearance, debris removal, repair, and resolution of inflammation. Its clinical significance also extends to conditions in which recruitment becomes excessive or persistent, because that pattern may contribute to chronic inflammatory disease or tumor progression.
Regulating the signals and cellular interactions that control recruitment could support two complementary therapeutic goals. In some settings, treatment may aim to enhance recruitment-related repair and resolution. In others, limiting excessive or prolonged immune activity may be more appropriate. Research on these regulatory mechanisms can therefore guide biomarker identification and development of therapies directed at harmful inflammation or impaired repair.