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Differential effects of iron load on basal and interferon-gamma plus lipopolysaccharide enhance anticryptococcal
S Saleppico1, J R Boelaert, F Omodeo Salè
1Department of Experimental Medicine and Biochemical Sciences, University of Perugia, Italy.
Abstract:
Here we evaluated the influence of intracellular iron levels on the constitutive and interferon (IFN)-gamma plus lipopolysaccharide (LPS) enhanced anticryptococcal activity by the murine microglial cell line BV-2. We demonstrated that iron loading via ferric nitrilotriacetate (FeNTA) resulted in a significant increase in the constitutive levels of anticryptococcal activity, while the enhancing effects by IFN-gamma plus LPS were prevented. Accordingly, a major increase was observed in the levels of thiobarbituric reactive substance (TBARS) produced upon iron loading under basal conditions, whereas IFN-gamma plus LPS treatment, that per se did not affect TBARS production, prevented by about 50% the enhancement otherwise occurring in response to iron loading. The potential involvement of multiple effector system and their relation to intracellular iron will be discussed.
Insights
Iron loading boosts microglial anticryptococcal activity but blocks interferon-gamma and lipopolysaccharide enhancement. Iron also increases oxidative stress, which is partially reduced by these immune-activating agents.
Area of Science:
- Immunology
- Microbiology
- Cell Biology
Background:
- Microglia are key immune cells in the brain.
- Anticryptococcal activity is crucial for host defense.
- Intracellular iron levels can modulate immune cell function.
Purpose of the Study:
- To investigate the role of intracellular iron in microglial anticryptococcal activity.
- To determine how iron affects both basal and cytokine-enhanced microglial responses.
- To explore the relationship between iron, oxidative stress, and microglial function.
Main Methods:
- Using the murine microglial cell line BV-2.
- Iron loading with ferric nitrilotriacetate (FeNTA).
- Assessing anticryptococcal activity and thiobarbituric reactive substance (TBARS) production.
Main Results:
- Iron loading significantly increased basal anticryptococcal activity.
- Iron loading prevented the enhancing effects of interferon-gamma (IFN-gamma) plus lipopolysaccharide (LPS).
- Iron loading increased TBARS production, indicating oxidative stress, which was partially inhibited by IFN-gamma plus LPS.
Conclusions:
- Intracellular iron influences microglial anticryptococcal activity.
- Iron may act through oxidative stress pathways to modulate microglial function.
- The interplay between iron and immune-activating cytokines is complex and warrants further investigation.