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In vitro-differentiated embryonic stem cell macrophages: a model system for studying atherosclerosis-associated
K J Moore1, R P Fabunmi, L P Andersson
1Lipid Metabolism Unit, Massachusetts General Hospital, Boston, MA 02114, USA.
Arteriosclerosis, Thrombosis, and Vascular Biology
|October 9, 1998
Summary
Embryonic stem cell-derived macrophages (ES Mo) effectively model arterial lesion macrophages, showing key markers and functions relevant to atherosclerosis research. This system offers a versatile platform for studying macrophage behavior in vitro.
Area of Science:
- Cell Biology
- Immunology
- Cardiovascular Research
Background:
- Monocytes/macrophages (Mo) are crucial in initiating and advancing atherosclerotic lesions.
- Understanding Mo functions in atherosclerosis is vital for developing targeted therapies.
Purpose of the Study:
- To characterize in vitro-differentiated embryonic stem (ES) cell macrophages as a model for studying atherosclerosis-associated Mo functions.
- To evaluate the suitability of ES Mo for investigating macrophage-restricted gene expression.
Main Methods:
- Immunofluorescence staining and Western analysis to identify macrophage markers and LDL receptors.
- Incubation with acetylated low-density lipoprotein (LDL) to induce foam cell formation.
- Oil red O staining to visualize lipid accumulation.
- Assessing expression of matrix-degrading metalloproteinases (MMPs) and cytokine secretion.
- Transfection studies using a green fluorescent protein reporter gene driven by the CD11b promoter.
Main Results:
- ES Mo express typical macrophage cell surface markers and receptors for modified LDL (SR-A, CD36, CD68).
- Differentiated ES Mo efficiently bind and degrade acetylated LDL, forming characteristic "foamy" macrophages.
- ES Mo express MMP-3 and MMP-9 and secrete inflammatory cytokines (TNF-α, IL-6) upon stimulation.
- ES Mo support macrophage-restricted gene expression studies via transfection.
Conclusions:
- ES Mo exhibit key properties of arterial lesion macrophages, making them a valuable in vitro model.
- The genetic manipulability of ES Mo provides an attractive system for in vitro investigations of macrophage functions in atherosclerosis.