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Iron regulates microglial cell-mediated secretory and effector functions
S Saleppico1, R Mazzolla, J R Boelaert
1Department of Experimental Medicine and Biochemical Sciences, University of Perugia, Perugia, Italy.
Abstract:
Iron homeostasis and macrophage physiology are tightly intertwined. In the present study, we evaluated the influence of iron loading on the constitutive and interferon-gamma (IFN-gamma) plus lipopolysaccharide (LPS)-induced functional and secretory properties of microglial cells, using the in vitro established murine cell line BV-2. We demonstrate that iron augments the basal and IFN-gamma plus LPS-enhanced anti-Candida albicans activity exerted by BV-2 cells and that the phenomenon occurs with no enhancement of phagocytic activity. Furthermore, when the secretory properties of IFN-gamma plus LPS-treated BV-2 cells were assessed, we found that tumor necrosis factor remains unchanged while nitric oxide production is significantly reduced in iron-loaded cells. The addition of the iron chelator deferiprone (L1) reverts the effects of iron on BV-2 functional and secretory properties. These data suggest that iron differently affects secretory and effector functions of BV-2 microglial cells, thus implying that iron interferes with murine microglial cell physiology.
Insights
Iron loading enhances microglial cell anti-fungal activity but reduces nitric oxide production. Iron
Area of Science:
- Immunology
- Neuroscience
- Cell Biology
Background:
- Iron homeostasis is crucial for macrophage function.
- Microglial cells, the resident immune cells of the brain, play a key role in neuroinflammation.
- Understanding iron's impact on microglial cells is vital for neurological disease research.
Purpose of the Study:
- To investigate the effect of iron loading on microglial cell (BV-2) functional and secretory properties.
- To assess how iron influences both basal and stimulated (interferon-gamma plus lipopolysaccharide) microglial responses.
- To determine the role of iron in microglial anti-fungal activity and inflammatory mediator production.
Main Methods:
- Utilized the in vitro murine microglial cell line BV-2.
- Applied iron loading to BV-2 cells.
- Stimulated cells with interferon-gamma (IFN-gamma) and lipopolysaccharide (LPS).
- Assessed anti-Candida albicans activity, phagocytic activity, and the secretion of tumor necrosis factor and nitric oxide.
- Used the iron chelator deferiprone (L1) to reverse iron's effects.
Main Results:
- Iron loading augmented both basal and IFN-gamma plus LPS-enhanced anti-Candida albicans activity in BV-2 cells.
- Iron did not enhance the phagocytic activity of BV-2 cells.
- Tumor necrosis factor levels remained unchanged, but nitric oxide production was significantly reduced in iron-loaded cells.
- Deferiprone treatment reverted the observed effects of iron on BV-2 cell functions.
Conclusions:
- Iron differentially affects the secretory and effector functions of murine microglial cells.
- Iron loading impacts microglial cell physiology, influencing their immune response capabilities.
- These findings suggest a complex role for iron in modulating microglial immune defense and inflammatory signaling.