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Culture of Macrophage Colony-stimulating Factor Differentiated Human Monocyte-derived Macrophages
Published on: June 30, 2016
Transformation of cultured human monocytes by peroxidized low-density lipoprotein
1Second Department of Internal Medicine, Hirosaki University, Japan.
Abstract:
To study the roles of peroxidized low-density lipoprotein (pox-LDL) during the formation of foam cells from human monocytes, monocytes isolated from normal human blood were incubated with RPMI alone, normal low-density lipoprotein (n-LDL) and copper pox-LDL. The concentrations of total cholesterol (TCH) and lipid peroxide in the human monocyte medium did not change significantly after incubation with RPMI medium alone or n-LDL, but those of TCH decreased slightly after incubation with pox-LDL for 24 h. Triglyceride (TG) concentrations in the culture medium of human monocytes decreased after incubation with all above substances. Ultrastructural studies showed that the monocytes changed to macrophages after incubation with RPMI alone or n-LDL and to foam cells after incubation with pox-LDL for 48 h. We conclude that TGs may be metabolized for ATP production by human monocytes. The energy may play a role in the transformation of monocytes to macrophages, and pox-LDL can induce transformation of monocyte-derived macrophages to foam cells.
Insights
Peroxidized low-density lipoprotein (pox-LDL) transforms human monocytes into foam cells. Triglycerides fuel this monocyte transformation, suggesting a role in cellular energy metabolism.
Area of Science:
- Cell Biology
- Biochemistry
- Cardiovascular Research
Background:
- Foam cell formation is a key process in atherosclerosis.
- Modified lipoproteins, like oxidized LDL, are implicated in foam cell development.
- Human monocytes are precursors to macrophages and foam cells.
Purpose of the Study:
- To investigate the role of peroxidized low-density lipoprotein (pox-LDL) in foam cell formation from human monocytes.
- To understand the metabolic changes in monocytes during transformation.
- To elucidate the specific effects of pox-LDL on monocyte-derived macrophages.
Main Methods:
- Isolation of human monocytes from blood.
- Incubation of monocytes with RPMI medium, normal LDL (n-LDL), and copper-oxidized LDL (pox-LDL).
- Measurement of total cholesterol, lipid peroxide, and triglyceride concentrations.
- Ultrastructural analysis of cell morphology.
Main Results:
- Monocytes transformed into macrophages with RPMI or n-LDL.
- Monocytes transformed into foam cells upon incubation with pox-LDL for 48 hours.
- Triglyceride levels decreased across all incubation conditions, suggesting metabolism for energy.
- Total cholesterol levels decreased slightly with pox-LDL exposure.
Conclusions:
- Triglycerides may be metabolized by monocytes for ATP production, supporting monocyte-macrophage differentiation.
- Peroxidized low-density lipoprotein (pox-LDL) is a potent inducer of monocyte-derived macrophage transformation into foam cells.
- This process highlights a critical mechanism in the development of atherosclerotic lesions.
