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Effect of zinc on peritoneal macrophages in vitro
Abstract:
Rat peritoneal macrophages incubated in a medium with 10% autologous serum showed 50% inhibition of O2 consumption by 0.4 mM zinc only when activated by yeast. Zinc ions had no effect on resting macrophages. The inhibitory efficiency of zinc depended on the ratio of yeast particles to macrophages; with more activated cells, the inhibition was less. The multiple-shaped intact macrophages changed into rounded cells in the presence of 0.1 and 0.5 mM Zn2+ as shown by photomicrography and scanning electron microscopy. When the incubation medium was replaced by zinc-free medium, cells recovered and became irregularly shaped. The reversibility of zinc effect on cell morphology corresponded with uptake and release of zinc by macrophages. The presence of serum in the medium interfered with the magnitude of zinc uptake by macrophages. We conclude that besides already reported effects of zinc on mast cells, platelets, and granulocytes, zinc ions also inhibit some functions of macrophages.
Insights
Zinc ions inhibit oxygen consumption in activated rat macrophages, affecting their shape and function. This effect is reversible and depends on yeast particle concentration and serum presence.
Area of Science:
- Immunology
- Cell Biology
- Toxicology
Background:
- Zinc is essential for various biological processes.
- Previous studies indicated zinc's effects on immune cells like mast cells, platelets, and granulocytes.
- The impact of zinc on macrophage function remained less understood.
Purpose of the Study:
- To investigate the effect of zinc ions on rat peritoneal macrophages.
- To determine if zinc affects macrophage oxygen consumption and morphology.
- To explore the reversibility and influencing factors of zinc's effects on macrophages.
Main Methods:
- Incubation of rat peritoneal macrophages with varying concentrations of zinc ions.
- Activation of macrophages using yeast particles.
- Measurement of oxygen consumption.
- Assessment of cell morphology via photomicrography and scanning electron microscopy.
- Analysis of zinc uptake and release.
Main Results:
- Zinc ions (0.4 mM) significantly inhibited oxygen consumption in yeast-activated macrophages by 50%.
- Resting macrophages showed no inhibition by zinc.
- Zinc exposure (0.1 and 0.5 mM) altered macrophage morphology from irregular to rounded, an effect that was reversible upon zinc removal.
- Serum presence modulated zinc uptake by macrophages.
- Inhibitory effect of zinc was inversely related to the yeast-to-macrophage ratio.
Conclusions:
- Zinc ions inhibit key functions of activated macrophages, including oxygen consumption.
- Zinc affects macrophage morphology in a reversible manner, linked to zinc uptake and release.
- Serum influences zinc's interaction with macrophages, highlighting the complexity of zinc's role in immune cell function.