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Fluoride inhibition of polymorphonuclear leukocytes
Abstract:
Significant inhibition of PMN metabolic activity by F- occurred at 0.1, 0.5 and 0.0 mM F- for O2- generation, 1-C14 CO2 release labeled glucose and NBT-reduction respectively. This inhibition resulted primarily from F- suppression of nonoxidative glucose metabolism. As the concentration of F- in the O2- generating system increased beyond 10 mM, a rise in production of O2- anion occurred, peaking at 20 mM F-, followed by a rapid decline.
Insights
Fluoride (F-) significantly inhibits polymorphonuclear (PMN) metabolic activity, primarily by suppressing glucose metabolism. However, high fluoride concentrations paradoxically increase oxygen anion (O2-) generation.
Area of Science:
- Biochemistry
- Cell Biology
- Immunology
Background:
- Polymorphonuclear leukocytes (PMNs) are crucial immune cells involved in the respiratory burst.
- Fluoride's effect on cellular metabolism, particularly in immune cells, requires further elucidation.
Purpose of the Study:
- To investigate the impact of fluoride (F-) on PMN metabolic activity.
- To determine the specific pathways affected by fluoride, including oxygen anion (O2-) generation and glucose metabolism.
Main Methods:
- Assessing O2- generation in PMNs.
- Measuring 1-C14 CO2 release from labeled glucose to evaluate glucose metabolism.
- Quantifying NBT reduction as an indicator of metabolic activity.
Main Results:
- Fluoride significantly inhibited PMN metabolic activity at low concentrations (0.1, 0.5, and 0.0 mM) for O2- generation, glucose metabolism, and NBT reduction.
- The observed inhibition was mainly due to fluoride's suppression of nonoxidative glucose metabolism.
- Elevated fluoride concentrations (above 10 mM) led to increased O2- anion production, peaking at 20 mM before declining.
Conclusions:
- Fluoride exerts a dose-dependent effect on PMN metabolic activity.
- Low fluoride concentrations inhibit key metabolic processes in PMNs, impacting their function.
- High fluoride concentrations can paradoxically stimulate O2- production in PMNs, suggesting complex regulatory mechanisms.